2024年5月30日发(作者：学俊美)
19-2764; Rev 5; 11/09
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Low-Cost Multichemistry Battery Chargers
General DescriptionFeatures
The MAX1908/MAX8724/MAX8765/MAX8765A highly
integrated, multichemistry battery-charger control ICs
o±0.5% Output Voltage Accuracy Using Internal
simplify the construction of accurate and efficient charg-
Reference (±0.4% for MAX8765A, 2-/3-Cell Only)
ers. These devices use analog inputs to control charge
o±4% Accurate Input Current Limiting
current and voltage, and can be programmed by the host
or hardwired. The MAX1908/MAX8724/MAX8765/
o±5% Accurate Charge Current
MAX8765A achieve high efficiency using a buck topology
oAnalog Inputs Control Charge Current and
with synchronous rectification.
Charge Voltage
The MAX1908/MAX8724/MAX8765/MAX8765A feature
input current limiting. This feature reduces battery
oOutputs for Monitoring
Current Drawn from AC Adapter
charge current when the input current limit is reached
to avoid overloading the AC adapter when supplying
Charging Current
the load and the battery charger simultaneously. The
AC Adapter Presence
MAX1908/MAX8724/MAX8765/MAX8765A provide out-
oUp to 17.6V Battery-Voltage Set Point
puts to monitor current drawn from the AC adapter (DC
input source), battery-charging current, and the pres-
oMaximum 28V Input Voltage
ence of an AC adapter. The MAX1908’s conditioning
o> 95% Efficiency
charge feature provides 300mA to safely charge deeply
discharged lithium-ion (Li+) battery packs.
oShutdown Control Input
The MAX1908 includes a conditioning charge feature
oCharge Any Battery Chemistry
while the MAX8724/MAX8765/MAX8765Ado not.
Li+, NiCd, NiMH, Lead Acid, etc.
The MAX1908/MAX8724/MAX8765/MAX8765A charge two
Ordering Information
to four series Li+ cells, providing more than 5A, and are
available in a space-saving, 28-pin, thin QFN package (5mm
PARTTEMP RANGEPIN-PACKAGE
×5mm). An evaluation kit is available to speed designs.
MAX1908ETI+-40°C to +85°C28 Thin QFN-EP*
Applications
MAX8724ETI+-40°C to +85°C28 Thin QFN-EP*
Notebook and Subnotebook Computers
MAX8765ETI+-40°C to +85°C28 Thin QFN-EP*
Personal Digital Assistants
MAX8765AETI+-40°C to +85°C28 Thin QFN-EP*
Handheld Terminals
+
Denotes a lead(Pb)-free/RoHS-compliant package.
Minimum Operating Circuit
*
EP = Exposed pad.
AC ADAPTERTO EXTERNAL
Pin Configuration
INPUT
0.01Ω
LOAD
CSSPCSSN
TOP VIEW
D
S
CELLS
O
N
P
N
LT
L
II
LT
T
DCIN
L
GSS
EA
C
LDO
D
P
CCC
BV
REFIN
212
LDO
VCTL
BST
ICTL
DLOV
DLOV
22
14
GND
ACIN
MAX1908
LX
23
13
ICTL
ACOK
MAX8724
DHI
MAX8765
BST
24
12
REFIN
FROM HOST µP
SHDN
MAX8765A
LX
DHI
25
MAX1908
ICHG
DLO
MAX8724
11
ACOK
10µH
CSSN
26
MAX8765
10
ACIN
IINP
PGND
CSSP
27
MAX8765A
9
ICHG
CCV
CSIP
CCI
0.015Ω
IINP
28
8
SHDN
CCS
CSIN
BATT
BATT+
+
1234567
REFCLS
GND
NOSFSI
I
C
D
L
E
C
V
D
L
C
R
C
C
C
C
C
THIN QFN
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information,please contact Maxim Directat 1-888-629-4642,
or visit Maxim’s website at .
/
MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
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A
ABSOLUTE MAXIMUM RATINGS
DCIN, CSSP, CSSN, .-0.3V to +30V
BST -0.3V to +36V
BST -0.3V to +6V
DHI .-0.3V to (V
BST
+ 0.3V)
LX .-6V to +30V
BATT, CSIP, CSIN .-0.3V to +20V
CSIP to CSIN or CSSP to CSSN or
PGND -0.3V to +0.3V
CCI, CCS, CCV, DLO, ICHG,
IINP, ACIN, REF .-0.3V to (V
LDO
+ 0.3V)
DLOV, VCTL, ICTL, REFIN, CELLS, CLS,
LDO, -0.3V to +6V
DLOV -0.3V to +0.3V
DLO -0.3V to (V
DLOV
+ 0.3V)
LDO .50mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin Thin QFN (5mm ×5mm)
(derate 20.8mW/°C above +70°C) .........................1666.7mW
Operating Temperature Range ..........................-40°C to +85°C
+150°C
Storage -60°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETERSYMBOLCONDITIONSMIN
TYP
MAX
+
0.5
+
0.5
+
0.5
+
0.4
+0.4
+0.4
%
UNITS
HARGE-VOLTAGE REGULATIONC
attery-Regulation VoltageB
Accuracy
(MAX1908/MAX8724/MAX8765
(2, 3, or 4 Cells) and MAX8765A
(4 Cells Only))
Battery-Regulation Voltage
Accuracy (MAX8765A, 2 or 3
Cells Only)
VCTL
= V
REFIN
V
VCTL
= V
REFIN
/20V
V
VCTL
= V
LDO
0.5-
0.5-
-0.5
4.1
1
.20
75
CTL Default ThresholdV
EFIN RangeR
REFIN Undervoltage Lockout
CHARGE-CURRENT REGULATION
CSIP-to-CSIN Full-Scale Current-
Sense Voltage
VCTL
= V
REFIN
V
VCTL
= V
REFIN
/20V
V
VCTL
= V
LDO
V
VCTL
rising
(
Note 1)
V
REFIN
falling
V
ICTL
= V
REFIN
0.4-
0.4-
-0.4
4.0
2.5
71.25
%
.24
3
.6
1.92
78.75
+
5
+
5
+
6
+
45
+
33
+
2
+
2
4.2
1
9
V
V
V
mV
Charging-Current Accuracy
ICTL
= V
REFIN
V
ICTL
= V
REFIN
x 0.6V
ICTL
= V
LDO
V
MAX8765/MAX8765A only; V
ICTL
= V
REFIN
x
0.036
MAX8724 only; V
ICTL
= V
REFIN
x 0.058
5-
5-
-6
-45
-33
-
2
-
2
4.0
0
4.1
%
Charge-Current Gain Error
(MAX8765/MAX8765A Only)
Charge-Current Offset
(MAX8765/MAX8765A Only)
V
ICTL
rising
%
mV
V
V
CTL Default ThresholdI
ATT/CSIP/CSIN Input VoltageB
Range
2_______________________________________________________________________________________
/
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETERSYMBOLCONDITIONSM
INT
YPM
AXU
NITS
C
SIP/CSIN Input Current
V
DCIN
= 0V or V
ICTL
= 0V or V
SHDN
= 0V
1
C
harging
4
00
6
50
µ
A
C
ycle-by-Cycle Maximum Current
Limit
R
S2 = 0.015mΩ6
.06
.87
.5
A
I
CTL Power-Down Mode
Threshold Voltage
V
VCTL
rising
R
EFIN/
REFIN/
REFIN/
(MAX1908/MAX8724 Only)
1005533
V
I
CTL, VCTL Input Bias Current
V
VCTL
= V
ICTL
= 0 or 3V
-1
+
1
V
-1
µ
DCIN
= 0V, V
VCTL
= V
ICTL
= V
REFIN
= 5V+
1
A
R
EFIN Input Bias Current
V
DCIN
= 5V, V
REFIN
= 3V-
1
+
1
V
-
1
µ
REFIN
= 5V+
1
A
I
CHG Transconductance
(MAX1908/MAX8724 Only)
G
ICHG
V
CSIP
- V
CSIN
= 45mV2
.73
3
.3µ
A/mV
I
CHG Transconductance
(MAX8765/MAX8765A Only)
G
ICHG
V
CSIP
- V
CSIN
= 45mV2
.853
3
.15µ
A/mV
I
CHG Transconductance Error
(MAX8765/MAX8765A Only)
-
5
+
5%
I
CHG Transconductance Offset
(MAX8765/MAX8765A Only)
-
5
+
5µ
A
V
CSIP
- V
CSIN
= 75mV
-6
+
6
I
CHG Accuracy
V
CSIP
- V
CSIN
= 45mV
-5
+
5%
V
CSIP
- V
CSIN
= 5mV-
40
+
40
ICHG Output Current
V
CSIP
- V
CSIN
= 150mV, V
ICHG
= 0V3
50
µ
A
ICHG Output Voltage
V
CSIP
- V
CSIN
= 150mV, ICHG
= open3
.5
V
I
NPUT-CURRENT REGULATION
C
SSP-to-CSSN Full-Scale
Current-Sense Voltage
7
27
57
8m
V
V
CLS
= V
REF
-
4
+
4
I
nput Current-Limit Accuracy
V
CLS
= V
REF
/2
-7.5
+
7.5
%
V
CLS
= 1.1V (MAX8765/MAX8765A only)
-10
+
10
I
nput Current-Limit Gain Error
(MAX8765/MAX8765A Only)
-
2
+
2%
I
nput Current-Limit Offset
(MAX8765/MAX8765A Only)
-
2
+
2m
V
C
SSP, CSSN Input Voltage
Range
8
2
8V
C
SSP, CSSN Input Current
V
DCIN
= 0V
0
.1
(MAX1908/MAX8724 Only)
1
V
µ
CSSP
= V
CSSN
= V
DCIN
> 8V
3
506
00
A
C
SSP Input Current
V
01
CSSP
= V
CSSN
= 28V
V
DCIN
= 0V
.1
(MAX8765/MAX8765A Only)
V
µ
DCIN
= 28V
4
006
50
A
_______________________________________________________________________________________3
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MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
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A
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
CSSN Input Current
(MAX8765/MAX8765A Only)
CLS Input Range
(MAX1908/MAX8724 Only)
CLS Input Range
(MAX8765/MAX8765A Only)
SYMBOLCONDITIONS
V
CSSP
= V
CSSN
= 28V
G
IINP
DCIN
= 0VV
DCIN
= 28VV
MIN
1
.6
1
.1
-1
2.7
-5
-7.5
2.82
-
6
-
10
YPT
0
.1
0
.1
3
MAX
1
1
R
EF
R
EF
+
1
3.3
+
5
+
7.5
3.18
+
6
+
10
UNITS
µA
V
V
µA
µA/mV
%
µA/mV
%
µA
µ
A
V
V
V
mA
µA
V
mV
V
V
CLS
= 2V
V
CSSP
- V
CSSN
= 75mV
LS Input Bias CurrentC
INP TransconductanceI
(MAX1908/MAX8724 Only)
IINP Accuracy
IINP Transconductance
(MAX8765/MAX8765A Only)
IINP Transconductance Error
(MAX8765/MAX8765A Only)
IINP Transconductance Offset
(MAX8765/MAX8765A Only)
G
IINP
CSSP
- V
CSSN
= 75mVV
V
CSSP
- V
CSSN
= 37.5mV
V
CSSP
- V
CCSN
= 75mV
3
V
DCIN
V
CSSP
- V
CSSN
= 150mV, V
IINP
= 0V
V
CSSP
- V
CSSN
= 150mV, V
IINP
= open
.47
7
.5
3
.2
2
00
5.4
3
4
4
INP Output CurrentI
INP Output VoltageI
SUPPLY AND LDO REGULATOR
DCIN Input Voltage Range
DCIN Undervoltage-Lockout Trip
Point
DCIN Quiescent Current
BATT Input Current
503
.53
8
2
8
I
DCIN
I
BATT
DO Output VoltageL
DO Load RegulationL
LDO Undervoltage-Lockout Trip
Point
V
DCIN
falling
V
DCIN
rising
8.0V < V
DCIN
< 28V
V
BATT
= 19V, V
DCIN
= 0V
V
BATT
= 2V to 19V, V
DCIN
= 19.3V
8
V < V
DCIN
< 28V, no load
0
< I
LDO
< 10mA
V
DCIN
= 8V
7
5.25
3.20
7.85
6
1
500
5.55
100
5.15
EFERENCER
EF Output VoltageR
REF Undervoltage-Lockout Trip
Point
0
< I
REF
< 500µA
V
REF
falling
4.072
4.096
3
.1
4.120
3.9
V
V
4_______________________________________________________________________________________
/
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETERSYMBOLCONDITIONSM
INT
YPM
AXU
NITS
T
RIP POINTS
V
DCIN
falling, referred to V
CSIN
5
01
001
50
B
ATT Power-Fail Threshold
(MAX1908/MAX8724 only)
V
m
V
CSSP
falling, referred to V
CSIN
(MAX8765/MAX8765A only)
5
01
001
50
B
ATT Power-Fail Threshold
Hysteresis
2
00
m
V
A
CIN Threshold
ACIN rising (MAX8765/MAX8765A only)
2.028
2.048
2.068
A
CIN rising (MAX1908/MAX8724 only)
2.007
2.048
2.089
V
ACIN Threshold Hysteresis
0
.5% of REF
2
0
m
V
ACIN Input Bias Current
V
ACIN
= 2.048V-
1
+
1µ
A
S
WITCHING REGULATOR
D
HI Off-Time
V
BATT
= 16V, V
DCIN
= 19V,
V
CELLS
= V
REFIN
0
.360
.40
.44µ
s
D
HI Minimum Off-Time
V
BATT
= 16V, V
DCIN
= 17V,
V
CELLS
= V
REFIN
0
.240
.280
.33µ
s
DHI Maximum On-Time
2
.5
5
7.5
ms
DLOV Supply Current
D
LO low
5
10
µA
B
ST Supply Current
D
HI high
6
1
5µ
A
B
ST Input Quiescent Current
V
DCIN
= 0V, V
BST
= 24.5V,
V
BATT
= V
LX
= 20V
0
.31
µ
A
LX Input Bias Current
V
DCIN
= 28V, V
BATT
= V
LX
= 20V
1
505
00
µA
LX Input Quiescent Current
V
DCIN
= 0V, V
BATT
= V
LX
= 20V
0
.31
µA
D
HI Maximum Duty Cycle
9
99
9.9
%
M
inimum Discontinuous-Mode
Ripple Current
0
.5
A
B
attery Undervoltage Charge
V
BATT
= 3V per cell (RS2 = 15mΩ),
CurrentMAX1908 only, V
BATT
rising
1
503
004
50m
A
B
attery Undervoltage Current
CELLS = GND, MAX1908 only, V
BATT
rising
6.1
6.2
6.3
Threshold
CELLS = open, MAX1908 only, V
BATT
rising
9.15
9.3
9.45V
CELLS = V
REFIN
, MAX1908 only, V
BATT
rising1
2.21
2.41
2.6
DHI On-Resistance High
V
BST
- V
LX
= 4.5V, I
DHI
= +100mA
4
7
Ω
DHI On-Resistance Low
V
BST
- V
LX
= 4.5V, I
DHI
= -100mA
1
3
.5
Ω
D
LO On-Resistance High
V
DLOV
= 4.5V, I
DLO
= +100mA
4
7
Ω
D
LO On-Resistance Low
V
DLOV
= 4.5V, I
DLO
= -100mA
1
3
.5Ω
_______________________________________________________________________________________5
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MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
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0
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ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
ERROR AMPLIFIERS
GMV Amplifier Transconductance
GMI Amplifier Transconductance
GMS Amplifier Transconductance
CCI, CCS, CCV Clamp Voltage
GMV
GMI
GMS
V
V
C
V 16.8V ,
T L
=
LD O
, V
BAT T
=
C EL LS = V
RE F IN
V
ICTL
= V
, V
CSIP
- V
CSIN
= 75mV
RE F IN
V
CLS
= V
REF
, V
CSSP
- V
CSSN
= 75mV
0
.25V < V
CCV,CCS,CCI
< 2V
0.0625
0.5
0.5
150
0.125
1
1
300
0.2500
2.0
2.0
600
0
.4
µA/mV
µA/mV
µA/mV
mV
V
V
SYMBOLCONDITIONSMIN
TYP
MAX
UNITS
OGIC LEVELSL
ELLS Input Low VoltageC
CELLS Input Open Voltage
C
ELLS = open
0.2V
2
(V
REFIN
(
V
R
EF IN
V
R
/
EF IN
/2) -/2) +
0.2V
V
REFIN
- 0.4V
-2
0
CELLS Input High Voltage
CELLS Input Bias Current
C
ELLS = 0V or V
RE F IN
23.5
1
+
2
2
8
V
µA
V
m
A
COK AND SHDNA
COK Input Voltage RangeA
ACOK Sink Current
ACOK Leakage Current
SHDN Input Voltage Range
SHDN Input Bias Current
V
ACOK
= 0.4V, V
ACIN
= 3V
V
ACOK
= 28V, V
ACIN
= 0V
V
SHDN
= 0V OR V
LDO
V
SHDN
= 0V OR V
SHDN
= 5V
V
SHDN
falling
1
0
-1
-1
22
1
L
DO
+
1
+
1
25
Aµ
V
µA
% of
V
REFIN
% of
V
REFIN
SHDN Threshold
SHDN Threshold Hysteresis
6_______________________________________________________________________________________
/
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure1a; T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETERSYMBOLCONDITIONSM
INT
YPM
AXU
NITS
C
HARGE-VOLTAGE REGULATION
B
attery Regulation Voltage
V
VCTL
= V
REFIN
-0.6
+
0.6
Accuracy (2, 3, or 4 Cells)
V
VCTL
= V
REFIN
/20
-0.6
+
0.6%
V
VCTL
= V
LDO
-
0.6
+
0.6
REFIN Range
(
Note 1)2
.5
3
.6
V
REFIN Undervoltage Lockout
V
REFIN
falling
1
.92
V
C
HARGE CURRENT REGULATION
C
SIP-to-CSIN Full-Scale Current-
Sense Voltage
V
ICTL
= V
REFIN
7
0.5
7
9.5m
V
V
ICTL
= V
REFIN
-
6
+
6
V
ICTL
= V
REFIN
x 0.6
-7.5
+
7.5
V
-7.5
+
7.5
C
ICTL
= V
LDO
harging-Current Accuracy
M
AX8765/MAX8765A only; V
ICTL
= V
REFIN
x
0.036
-
50
+
50
%
MAX8724 only;
V
ICTL
= V
REFIN
x 0.058
-
33
+
33
C
harge-Current Gain Error
(MAX8765/MAX8765A Only)
-
2
+
2%
C
harge-Current Offset
(MAX8765/MAX8765A Only)
-
2
+
2m
V
B
ATT/CSIP/CSIN Input Voltage
Range
0
1
9V
C
SIP/CSIN Input Current
V
DCIN
= 0V or V
ICTL
= 0V or V
SHDN
= 0V
1
C
harging
6
50
µ
A
C
ycle-by-Cycle Maximum Current
Limit
I
MAX
R
S2 = 0.015Ω6
.0
7
.5A
I
CTL Power-Down Mode
Threshold Voltage
V
ICTL
rising
R
EFIN/R
EFIN/
100
33
V
(MAX1908/MAX8724 Only)
I
CHG Transconductance
(MAX1908/MAX8724 Only)
G
ICHG
V
CSIP
- V
CSIN
= 45mV2
.7
3
.3µ
A/mV
I
CHG Transconductance
(MAX8765/MAX8765A Only)
G
ICHG
V
CSIP
- V
CSIN
= 45mV2
.785
3
.225µ
A/mV
I
CHG Transconductance Error
(MAX8765/MAX8765A Only)
-
7.5
+
7.5%
I
CHG Transconductance Offset
(MAX8765/MAX8765A Only)
-
6.5
+
6.5µ
A
_______________________________________________________________________________________7
/
MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
M
A
X
1
9
0
8
/
M
A
X
8
7
2
4
/
M
A
X
8
7
6
5
/
M
A
X
8
7
6
5
A
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
ICHG Accuracy
SYMBOLCONDITIONS
CSIP
- V
CSIN
= 75mVV
CSIP
- V
CSIN
= 45mVV
V
CSIP
- V
CSIN
= 5mV
CLS
= V
REF
V
CLS
= V
REF
/2V
V
CLS
= 1.1V (MAX8765/MAX8765A only)
INM
7.5-
-7.5
-40
7
1.25
-5
TYP
AXM
+
7.5
+
7.5
+
40
7
8.75
+
5
+
7.5
+
10
+
2
+
2
2
8
1
6
00
1
6
50
1
1
R
EF
R
EF
3
.3
3
.225
+
7.5
+
12
+
7.5
+
7.5
UNITS
%
NPUT-CURRENT REGULATIONI
SSP-to-CSSN Full-ScaleC
Current-Sense Voltage
Input Current-Limit Accuracy
Input Current-Limit Gain Error
(MAX8765/MAX8765A Only)
Input Current-Limit Offset
(MAX8765/MAX8765A Only)
CSSP, CSSN Input Voltage
Range
CSSP, CSSN Input Current
(MAX1908/MAX8724 Only)
CSSP Input Current
(MAX8765/MAX8765A Only)
CSSN Input Current
(MAX8765/MAX8765A Only)
CLS Input Range
(MAX1908/MAX8724 Only)
CLS Input Range
(MAX8765/MAX8765A Only)
IINP Transconductance
(MAX1908/MAX8724 Only)
IINP Transconductance
(MAX8765/MAX8765A Only)
IINP Transconductance Error
(MAX8765/MAX8765A Only)
IINP Transconductance Offset
(MAX8765/MAX8765A Only)
IINP Accuracy
mV
%
G
IINP
G
IINP
7.5-
10-
-
2
-
2
8
%
mV
V
µA
µA
µA
V
V
µA/mV
µA/mV
%
µA
%
DCIN
= 0VV
V
CSSP
= V
CSSN
= V
DCIN
> 8V
V
DCIN
= 0V
V
CSSP
= V
CSSN
= 28V
DCIN
= 28VV
V
DCIN
= 0V
V
CSSP
= V
CSSN
= 28V
DCIN
= 28VV
V
CSSP
- V
CSSN
= 75mV
V
CSSP
- V
CCSN
= 75mV
1
.6
1
.1
2.7
2.785
-
7.5
-
12
CSSP
- V
CSSN
= 75mVV
V
CSSP
- V
CSSN
= 37.5mV
7.5-
7.5-
8_______________________________________________________________________________________
/
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETERSYMBOLCONDITIONSM
INT
YPM
AXU
NITS
SUPPLY AND LDO REGULATOR
DCIN Input Voltage Range
V
DCIN
8
2
8V
D
CIN Quiescent Current
I
DCIN
8
.0V < V
DCIN
< 28V
6
m
A
B
ATT Input CurrentI
1
BATT
V
BATT
= 19V, V
DCIN
= 0V
V
BATT
= 2V to 19V, V
DCIN
= 19.3V
5
00
µ
A
LDO Output Voltage
8
V < V
DCIN
< 28V, no load5
.25
5
.55V
LDO Load Regulation
0
< I
LDO
< 10mA
1
00m
V
R
EFERENCE
R
EF Output Voltage
0
< I
REF
< 500µA4
.065
4
.120V
T
RIP POINTS
V
DCIN
falling, referred to V
CSIN
5
0
1
50
B
ATT Power-Fail Threshold
(MAX1908/MAX8724 only)
V
m
V
CSSP
falling, referred to V
CSIN
(MAX8765/MAX8765A only)
5
0
1
50
A
CIN Threshold
ACIN rising (
MAX8765/MAX8765A
only)
2.028
2
.068
A
CIN rising (MAX1908/MAX8724 only)
2.007
2
.089
V
S
WITCHING REGULATOR
D
HI Off-Time
V
BATT
= 16V, V
DCIN
= 19V,
V
CELLS
= V
REFIN
0
.35
0
.45µ
s
D
HI Minimum Off-Time
V
BATT
= 16V, V
DCIN
= 17V,
V
CELLS
= V
REFIN
0
.24
0
.33µ
s
DHI Maximum On-Time
2
.5
7
.5
ms
DHI Maximum Duty Cycle
9
9
%
B
attery Undervoltage Charge
V
BATT
= 3V per cell (RS2 = 15mΩ),
CurrentMAX1908 only, V
BATT
rising
1
50
4
50m
A
B
attery Undervoltage Current
CELLS = GND, MAX1908 only, V
BATT
rising
6.09
6
.30
Threshold
CELLS = open, MAX1908 only, V
BATT
rising
9.12
9
.45V
CELLS = V
REFIN
, MAX1908 only, V
BATT
rising1
2.18
1
2.60
DHI On-Resistance High
V
BST
- V
LX
= 4.5V, I
DHI
= +100mA
7
Ω
DHI On-Resistance Low
V
BST
- V
LX
= 4.5V, I
DHI
= -100mA
3
.5
Ω
D
LO On-Resistance High
V
DLOV
= 4.5V, I
DLO
= +100mA
7
Ω
D
LO On-Resistance Low
V
DLOV
= 4.5V, I
DLO
= -100mA
3
.5Ω
_______________________________________________________________________________________9
/
MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
M
A
X
1
9
0
8
/
M
A
X
8
7
2
4
/
M
A
X
8
7
6
5
/
M
A
X
8
7
6
5
A
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
ERROR AMPLIFIERS
GMV Amplifier Transconductance
GMV
V
V
C
V 16.8V ,
T L
=
LD O
, V
BAT T
=
C EL LS = V
RE F IN
0.0625
SYMBOLCONDITIONSMIN
TYP
MAX
UNITS
0
.250
2
.0
2
.0
6
00
0
.4
(
V
REF IN
/2) +
0.2V
µA/mV
MI Amplifier TransconductanceG
MIG
MS Amplifier Transconductance
GGMS
CCI, CCS, CCV Clamp Voltage
LOGIC LEVELS
CELLS Input Low Voltage
CELLS Input Open Voltage
CELLS Input High Voltage
ICTL
= V V, V
CSIP
- V
CSIN
= 75mV
RE F IN
CLS
= V
REF
, V
CSSP
- V
CSSN
= 75mVV
0
.25V < V
CCV,CCS,CCI
< 2V
C
ELLS = open
.50
.50
150
(V
REFIN
/2) -
0.2V
V
REFIN
- 0.4V
0
A/mVµ
A/mVµ
mV
V
V
V
V
m
A
V
% of
V
REFIN
V
ACOK
= 0.4V, V
ACIN
= 3V
2
8
COK AND SHDNA
COK Input Voltage RangeA
ACOK Sink Current
SHDN Input Voltage Range
SHDN Threshold
1
0
22
L
DO
2
5V
SHDN
falling
Note 1:If both ICTL and VCTL use default mode (connected to LDO), REFIN is not used and can be connected to LDO.
Note 2:Specifications to T
A
= -40°C are guaranteed by design and not production tested.
Typical Operating Characteristics
(Circuit of Figure 1, V
DCIN
= 20V, T
A
= +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
(BATTERY INSERTION AND REMOVAL)
MAX1908 toc01
LOAD-TRANSIENT RESPONSE
(STEP IN-LOAD CURRENT)
MAX1908 toc02
LOAD-TRANSIENT RESPONSE
(STEP IN-LOAD CURRENT)
MAX1908 toc03
I
BATT
2A/div
V
BATT
5V/div
CCV
V
CCI
500mV/div
V
CCV
500mV/div
CCI
ADAPTER
CURRENT
5A/div
LOAD
CURRENT
5A/div
V
BATT
2V/div
V
CCI
500mV/div
V
CCS
500mV/div
CCS
CCI
CCS
CCI
0
0
16.8V
LOAD
CURRENT
5A/div
ADAPTER
CURRENT
5A/div
CHARGE
CURRENT
2A/div
V
BATT
2V/div
1ms/div
ICTL = LDO
CHARGING CURRENT = 3A
V
BATT
= 16.8V
LOAD STEP = 0 TO 4A
I
SOURCE
LIMIT = 5A
0
0
0
ICTL = LDO
VCTL = LDO
1ms/div
1ms/div
ICTL = LDO
CHARGING CURRENT = 3A
V
BATT
= 16.8V
LOAD STEP = 0 TO 4A
I
SOURCE
LIMIT = 5A
10______________________________________________________________________________________
/
分销商库存信息:
MAXIM
MAX8765AETI+TMAX8765AETI+
2024年5月30日发(作者：学俊美)
19-2764; Rev 5; 11/09
E
V
A
L
U
A
T
I
O
N
K
I
T
A
V
A
I
L
A
B
L
E
Low-Cost Multichemistry Battery Chargers
General DescriptionFeatures
The MAX1908/MAX8724/MAX8765/MAX8765A highly
integrated, multichemistry battery-charger control ICs
o±0.5% Output Voltage Accuracy Using Internal
simplify the construction of accurate and efficient charg-
Reference (±0.4% for MAX8765A, 2-/3-Cell Only)
ers. These devices use analog inputs to control charge
o±4% Accurate Input Current Limiting
current and voltage, and can be programmed by the host
or hardwired. The MAX1908/MAX8724/MAX8765/
o±5% Accurate Charge Current
MAX8765A achieve high efficiency using a buck topology
oAnalog Inputs Control Charge Current and
with synchronous rectification.
Charge Voltage
The MAX1908/MAX8724/MAX8765/MAX8765A feature
input current limiting. This feature reduces battery
oOutputs for Monitoring
Current Drawn from AC Adapter
charge current when the input current limit is reached
to avoid overloading the AC adapter when supplying
Charging Current
the load and the battery charger simultaneously. The
AC Adapter Presence
MAX1908/MAX8724/MAX8765/MAX8765A provide out-
oUp to 17.6V Battery-Voltage Set Point
puts to monitor current drawn from the AC adapter (DC
input source), battery-charging current, and the pres-
oMaximum 28V Input Voltage
ence of an AC adapter. The MAX1908’s conditioning
o> 95% Efficiency
charge feature provides 300mA to safely charge deeply
discharged lithium-ion (Li+) battery packs.
oShutdown Control Input
The MAX1908 includes a conditioning charge feature
oCharge Any Battery Chemistry
while the MAX8724/MAX8765/MAX8765Ado not.
Li+, NiCd, NiMH, Lead Acid, etc.
The MAX1908/MAX8724/MAX8765/MAX8765A charge two
Ordering Information
to four series Li+ cells, providing more than 5A, and are
available in a space-saving, 28-pin, thin QFN package (5mm
PARTTEMP RANGEPIN-PACKAGE
×5mm). An evaluation kit is available to speed designs.
MAX1908ETI+-40°C to +85°C28 Thin QFN-EP*
Applications
MAX8724ETI+-40°C to +85°C28 Thin QFN-EP*
Notebook and Subnotebook Computers
MAX8765ETI+-40°C to +85°C28 Thin QFN-EP*
Personal Digital Assistants
MAX8765AETI+-40°C to +85°C28 Thin QFN-EP*
Handheld Terminals
+
Denotes a lead(Pb)-free/RoHS-compliant package.
Minimum Operating Circuit
*
EP = Exposed pad.
AC ADAPTERTO EXTERNAL
Pin Configuration
INPUT
0.01Ω
LOAD
CSSPCSSN
TOP VIEW
D
S
CELLS
O
N
P
N
LT
L
II
LT
T
DCIN
L
GSS
EA
C
LDO
D
P
CCC
BV
REFIN
212
LDO
VCTL
BST
ICTL
DLOV
DLOV
22
14
GND
ACIN
MAX1908
LX
23
13
ICTL
ACOK
MAX8724
DHI
MAX8765
BST
24
12
REFIN
FROM HOST µP
SHDN
MAX8765A
LX
DHI
25
MAX1908
ICHG
DLO
MAX8724
11
ACOK
10µH
CSSN
26
MAX8765
10
ACIN
IINP
PGND
CSSP
27
MAX8765A
9
ICHG
CCV
CSIP
CCI
0.015Ω
IINP
28
8
SHDN
CCS
CSIN
BATT
BATT+
+
1234567
REFCLS
GND
NOSFSI
I
C
D
L
E
C
V
D
L
C
R
C
C
C
C
C
THIN QFN
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information,please contact Maxim Directat 1-888-629-4642,
or visit Maxim’s website at .
/
MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
M
A
X
1
9
0
8
/
M
A
X
8
7
2
4
/
M
A
X
8
7
6
5
/
M
A
X
8
7
6
5
A
ABSOLUTE MAXIMUM RATINGS
DCIN, CSSP, CSSN, .-0.3V to +30V
BST -0.3V to +36V
BST -0.3V to +6V
DHI .-0.3V to (V
BST
+ 0.3V)
LX .-6V to +30V
BATT, CSIP, CSIN .-0.3V to +20V
CSIP to CSIN or CSSP to CSSN or
PGND -0.3V to +0.3V
CCI, CCS, CCV, DLO, ICHG,
IINP, ACIN, REF .-0.3V to (V
LDO
+ 0.3V)
DLOV, VCTL, ICTL, REFIN, CELLS, CLS,
LDO, -0.3V to +6V
DLOV -0.3V to +0.3V
DLO -0.3V to (V
DLOV
+ 0.3V)
LDO .50mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin Thin QFN (5mm ×5mm)
(derate 20.8mW/°C above +70°C) .........................1666.7mW
Operating Temperature Range ..........................-40°C to +85°C
+150°C
Storage -60°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETERSYMBOLCONDITIONSMIN
TYP
MAX
+
0.5
+
0.5
+
0.5
+
0.4
+0.4
+0.4
%
UNITS
HARGE-VOLTAGE REGULATIONC
attery-Regulation VoltageB
Accuracy
(MAX1908/MAX8724/MAX8765
(2, 3, or 4 Cells) and MAX8765A
(4 Cells Only))
Battery-Regulation Voltage
Accuracy (MAX8765A, 2 or 3
Cells Only)
VCTL
= V
REFIN
V
VCTL
= V
REFIN
/20V
V
VCTL
= V
LDO
0.5-
0.5-
-0.5
4.1
1
.20
75
CTL Default ThresholdV
EFIN RangeR
REFIN Undervoltage Lockout
CHARGE-CURRENT REGULATION
CSIP-to-CSIN Full-Scale Current-
Sense Voltage
VCTL
= V
REFIN
V
VCTL
= V
REFIN
/20V
V
VCTL
= V
LDO
V
VCTL
rising
(
Note 1)
V
REFIN
falling
V
ICTL
= V
REFIN
0.4-
0.4-
-0.4
4.0
2.5
71.25
%
.24
3
.6
1.92
78.75
+
5
+
5
+
6
+
45
+
33
+
2
+
2
4.2
1
9
V
V
V
mV
Charging-Current Accuracy
ICTL
= V
REFIN
V
ICTL
= V
REFIN
x 0.6V
ICTL
= V
LDO
V
MAX8765/MAX8765A only; V
ICTL
= V
REFIN
x
0.036
MAX8724 only; V
ICTL
= V
REFIN
x 0.058
5-
5-
-6
-45
-33
-
2
-
2
4.0
0
4.1
%
Charge-Current Gain Error
(MAX8765/MAX8765A Only)
Charge-Current Offset
(MAX8765/MAX8765A Only)
V
ICTL
rising
%
mV
V
V
CTL Default ThresholdI
ATT/CSIP/CSIN Input VoltageB
Range
2_______________________________________________________________________________________
/
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETERSYMBOLCONDITIONSM
INT
YPM
AXU
NITS
C
SIP/CSIN Input Current
V
DCIN
= 0V or V
ICTL
= 0V or V
SHDN
= 0V
1
C
harging
4
00
6
50
µ
A
C
ycle-by-Cycle Maximum Current
Limit
R
S2 = 0.015mΩ6
.06
.87
.5
A
I
CTL Power-Down Mode
Threshold Voltage
V
VCTL
rising
R
EFIN/
REFIN/
REFIN/
(MAX1908/MAX8724 Only)
1005533
V
I
CTL, VCTL Input Bias Current
V
VCTL
= V
ICTL
= 0 or 3V
-1
+
1
V
-1
µ
DCIN
= 0V, V
VCTL
= V
ICTL
= V
REFIN
= 5V+
1
A
R
EFIN Input Bias Current
V
DCIN
= 5V, V
REFIN
= 3V-
1
+
1
V
-
1
µ
REFIN
= 5V+
1
A
I
CHG Transconductance
(MAX1908/MAX8724 Only)
G
ICHG
V
CSIP
- V
CSIN
= 45mV2
.73
3
.3µ
A/mV
I
CHG Transconductance
(MAX8765/MAX8765A Only)
G
ICHG
V
CSIP
- V
CSIN
= 45mV2
.853
3
.15µ
A/mV
I
CHG Transconductance Error
(MAX8765/MAX8765A Only)
-
5
+
5%
I
CHG Transconductance Offset
(MAX8765/MAX8765A Only)
-
5
+
5µ
A
V
CSIP
- V
CSIN
= 75mV
-6
+
6
I
CHG Accuracy
V
CSIP
- V
CSIN
= 45mV
-5
+
5%
V
CSIP
- V
CSIN
= 5mV-
40
+
40
ICHG Output Current
V
CSIP
- V
CSIN
= 150mV, V
ICHG
= 0V3
50
µ
A
ICHG Output Voltage
V
CSIP
- V
CSIN
= 150mV, ICHG
= open3
.5
V
I
NPUT-CURRENT REGULATION
C
SSP-to-CSSN Full-Scale
Current-Sense Voltage
7
27
57
8m
V
V
CLS
= V
REF
-
4
+
4
I
nput Current-Limit Accuracy
V
CLS
= V
REF
/2
-7.5
+
7.5
%
V
CLS
= 1.1V (MAX8765/MAX8765A only)
-10
+
10
I
nput Current-Limit Gain Error
(MAX8765/MAX8765A Only)
-
2
+
2%
I
nput Current-Limit Offset
(MAX8765/MAX8765A Only)
-
2
+
2m
V
C
SSP, CSSN Input Voltage
Range
8
2
8V
C
SSP, CSSN Input Current
V
DCIN
= 0V
0
.1
(MAX1908/MAX8724 Only)
1
V
µ
CSSP
= V
CSSN
= V
DCIN
> 8V
3
506
00
A
C
SSP Input Current
V
01
CSSP
= V
CSSN
= 28V
V
DCIN
= 0V
.1
(MAX8765/MAX8765A Only)
V
µ
DCIN
= 28V
4
006
50
A
_______________________________________________________________________________________3
/
MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
M
A
X
1
9
0
8
/
M
A
X
8
7
2
4
/
M
A
X
8
7
6
5
/
M
A
X
8
7
6
5
A
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
CSSN Input Current
(MAX8765/MAX8765A Only)
CLS Input Range
(MAX1908/MAX8724 Only)
CLS Input Range
(MAX8765/MAX8765A Only)
SYMBOLCONDITIONS
V
CSSP
= V
CSSN
= 28V
G
IINP
DCIN
= 0VV
DCIN
= 28VV
MIN
1
.6
1
.1
-1
2.7
-5
-7.5
2.82
-
6
-
10
YPT
0
.1
0
.1
3
MAX
1
1
R
EF
R
EF
+
1
3.3
+
5
+
7.5
3.18
+
6
+
10
UNITS
µA
V
V
µA
µA/mV
%
µA/mV
%
µA
µ
A
V
V
V
mA
µA
V
mV
V
V
CLS
= 2V
V
CSSP
- V
CSSN
= 75mV
LS Input Bias CurrentC
INP TransconductanceI
(MAX1908/MAX8724 Only)
IINP Accuracy
IINP Transconductance
(MAX8765/MAX8765A Only)
IINP Transconductance Error
(MAX8765/MAX8765A Only)
IINP Transconductance Offset
(MAX8765/MAX8765A Only)
G
IINP
CSSP
- V
CSSN
= 75mVV
V
CSSP
- V
CSSN
= 37.5mV
V
CSSP
- V
CCSN
= 75mV
3
V
DCIN
V
CSSP
- V
CSSN
= 150mV, V
IINP
= 0V
V
CSSP
- V
CSSN
= 150mV, V
IINP
= open
.47
7
.5
3
.2
2
00
5.4
3
4
4
INP Output CurrentI
INP Output VoltageI
SUPPLY AND LDO REGULATOR
DCIN Input Voltage Range
DCIN Undervoltage-Lockout Trip
Point
DCIN Quiescent Current
BATT Input Current
503
.53
8
2
8
I
DCIN
I
BATT
DO Output VoltageL
DO Load RegulationL
LDO Undervoltage-Lockout Trip
Point
V
DCIN
falling
V
DCIN
rising
8.0V < V
DCIN
< 28V
V
BATT
= 19V, V
DCIN
= 0V
V
BATT
= 2V to 19V, V
DCIN
= 19.3V
8
V < V
DCIN
< 28V, no load
0
< I
LDO
< 10mA
V
DCIN
= 8V
7
5.25
3.20
7.85
6
1
500
5.55
100
5.15
EFERENCER
EF Output VoltageR
REF Undervoltage-Lockout Trip
Point
0
< I
REF
< 500µA
V
REF
falling
4.072
4.096
3
.1
4.120
3.9
V
V
4_______________________________________________________________________________________
/
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETERSYMBOLCONDITIONSM
INT
YPM
AXU
NITS
T
RIP POINTS
V
DCIN
falling, referred to V
CSIN
5
01
001
50
B
ATT Power-Fail Threshold
(MAX1908/MAX8724 only)
V
m
V
CSSP
falling, referred to V
CSIN
(MAX8765/MAX8765A only)
5
01
001
50
B
ATT Power-Fail Threshold
Hysteresis
2
00
m
V
A
CIN Threshold
ACIN rising (MAX8765/MAX8765A only)
2.028
2.048
2.068
A
CIN rising (MAX1908/MAX8724 only)
2.007
2.048
2.089
V
ACIN Threshold Hysteresis
0
.5% of REF
2
0
m
V
ACIN Input Bias Current
V
ACIN
= 2.048V-
1
+
1µ
A
S
WITCHING REGULATOR
D
HI Off-Time
V
BATT
= 16V, V
DCIN
= 19V,
V
CELLS
= V
REFIN
0
.360
.40
.44µ
s
D
HI Minimum Off-Time
V
BATT
= 16V, V
DCIN
= 17V,
V
CELLS
= V
REFIN
0
.240
.280
.33µ
s
DHI Maximum On-Time
2
.5
5
7.5
ms
DLOV Supply Current
D
LO low
5
10
µA
B
ST Supply Current
D
HI high
6
1
5µ
A
B
ST Input Quiescent Current
V
DCIN
= 0V, V
BST
= 24.5V,
V
BATT
= V
LX
= 20V
0
.31
µ
A
LX Input Bias Current
V
DCIN
= 28V, V
BATT
= V
LX
= 20V
1
505
00
µA
LX Input Quiescent Current
V
DCIN
= 0V, V
BATT
= V
LX
= 20V
0
.31
µA
D
HI Maximum Duty Cycle
9
99
9.9
%
M
inimum Discontinuous-Mode
Ripple Current
0
.5
A
B
attery Undervoltage Charge
V
BATT
= 3V per cell (RS2 = 15mΩ),
CurrentMAX1908 only, V
BATT
rising
1
503
004
50m
A
B
attery Undervoltage Current
CELLS = GND, MAX1908 only, V
BATT
rising
6.1
6.2
6.3
Threshold
CELLS = open, MAX1908 only, V
BATT
rising
9.15
9.3
9.45V
CELLS = V
REFIN
, MAX1908 only, V
BATT
rising1
2.21
2.41
2.6
DHI On-Resistance High
V
BST
- V
LX
= 4.5V, I
DHI
= +100mA
4
7
Ω
DHI On-Resistance Low
V
BST
- V
LX
= 4.5V, I
DHI
= -100mA
1
3
.5
Ω
D
LO On-Resistance High
V
DLOV
= 4.5V, I
DLO
= +100mA
4
7
Ω
D
LO On-Resistance Low
V
DLOV
= 4.5V, I
DLO
= -100mA
1
3
.5Ω
_______________________________________________________________________________________5
/
MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
M
A
X
1
9
0
8
/
M
A
X
8
7
2
4
/
M
A
X
8
7
6
5
/
M
A
X
8
7
6
5
A
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
ERROR AMPLIFIERS
GMV Amplifier Transconductance
GMI Amplifier Transconductance
GMS Amplifier Transconductance
CCI, CCS, CCV Clamp Voltage
GMV
GMI
GMS
V
V
C
V 16.8V ,
T L
=
LD O
, V
BAT T
=
C EL LS = V
RE F IN
V
ICTL
= V
, V
CSIP
- V
CSIN
= 75mV
RE F IN
V
CLS
= V
REF
, V
CSSP
- V
CSSN
= 75mV
0
.25V < V
CCV,CCS,CCI
< 2V
0.0625
0.5
0.5
150
0.125
1
1
300
0.2500
2.0
2.0
600
0
.4
µA/mV
µA/mV
µA/mV
mV
V
V
SYMBOLCONDITIONSMIN
TYP
MAX
UNITS
OGIC LEVELSL
ELLS Input Low VoltageC
CELLS Input Open Voltage
C
ELLS = open
0.2V
2
(V
REFIN
(
V
R
EF IN
V
R
/
EF IN
/2) -/2) +
0.2V
V
REFIN
- 0.4V
-2
0
CELLS Input High Voltage
CELLS Input Bias Current
C
ELLS = 0V or V
RE F IN
23.5
1
+
2
2
8
V
µA
V
m
A
COK AND SHDNA
COK Input Voltage RangeA
ACOK Sink Current
ACOK Leakage Current
SHDN Input Voltage Range
SHDN Input Bias Current
V
ACOK
= 0.4V, V
ACIN
= 3V
V
ACOK
= 28V, V
ACIN
= 0V
V
SHDN
= 0V OR V
LDO
V
SHDN
= 0V OR V
SHDN
= 5V
V
SHDN
falling
1
0
-1
-1
22
1
L
DO
+
1
+
1
25
Aµ
V
µA
% of
V
REFIN
% of
V
REFIN
SHDN Threshold
SHDN Threshold Hysteresis
6_______________________________________________________________________________________
/
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure1a; T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETERSYMBOLCONDITIONSM
INT
YPM
AXU
NITS
C
HARGE-VOLTAGE REGULATION
B
attery Regulation Voltage
V
VCTL
= V
REFIN
-0.6
+
0.6
Accuracy (2, 3, or 4 Cells)
V
VCTL
= V
REFIN
/20
-0.6
+
0.6%
V
VCTL
= V
LDO
-
0.6
+
0.6
REFIN Range
(
Note 1)2
.5
3
.6
V
REFIN Undervoltage Lockout
V
REFIN
falling
1
.92
V
C
HARGE CURRENT REGULATION
C
SIP-to-CSIN Full-Scale Current-
Sense Voltage
V
ICTL
= V
REFIN
7
0.5
7
9.5m
V
V
ICTL
= V
REFIN
-
6
+
6
V
ICTL
= V
REFIN
x 0.6
-7.5
+
7.5
V
-7.5
+
7.5
C
ICTL
= V
LDO
harging-Current Accuracy
M
AX8765/MAX8765A only; V
ICTL
= V
REFIN
x
0.036
-
50
+
50
%
MAX8724 only;
V
ICTL
= V
REFIN
x 0.058
-
33
+
33
C
harge-Current Gain Error
(MAX8765/MAX8765A Only)
-
2
+
2%
C
harge-Current Offset
(MAX8765/MAX8765A Only)
-
2
+
2m
V
B
ATT/CSIP/CSIN Input Voltage
Range
0
1
9V
C
SIP/CSIN Input Current
V
DCIN
= 0V or V
ICTL
= 0V or V
SHDN
= 0V
1
C
harging
6
50
µ
A
C
ycle-by-Cycle Maximum Current
Limit
I
MAX
R
S2 = 0.015Ω6
.0
7
.5A
I
CTL Power-Down Mode
Threshold Voltage
V
ICTL
rising
R
EFIN/R
EFIN/
100
33
V
(MAX1908/MAX8724 Only)
I
CHG Transconductance
(MAX1908/MAX8724 Only)
G
ICHG
V
CSIP
- V
CSIN
= 45mV2
.7
3
.3µ
A/mV
I
CHG Transconductance
(MAX8765/MAX8765A Only)
G
ICHG
V
CSIP
- V
CSIN
= 45mV2
.785
3
.225µ
A/mV
I
CHG Transconductance Error
(MAX8765/MAX8765A Only)
-
7.5
+
7.5%
I
CHG Transconductance Offset
(MAX8765/MAX8765A Only)
-
6.5
+
6.5µ
A
_______________________________________________________________________________________7
/
MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
M
A
X
1
9
0
8
/
M
A
X
8
7
2
4
/
M
A
X
8
7
6
5
/
M
A
X
8
7
6
5
A
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
ICHG Accuracy
SYMBOLCONDITIONS
CSIP
- V
CSIN
= 75mVV
CSIP
- V
CSIN
= 45mVV
V
CSIP
- V
CSIN
= 5mV
CLS
= V
REF
V
CLS
= V
REF
/2V
V
CLS
= 1.1V (MAX8765/MAX8765A only)
INM
7.5-
-7.5
-40
7
1.25
-5
TYP
AXM
+
7.5
+
7.5
+
40
7
8.75
+
5
+
7.5
+
10
+
2
+
2
2
8
1
6
00
1
6
50
1
1
R
EF
R
EF
3
.3
3
.225
+
7.5
+
12
+
7.5
+
7.5
UNITS
%
NPUT-CURRENT REGULATIONI
SSP-to-CSSN Full-ScaleC
Current-Sense Voltage
Input Current-Limit Accuracy
Input Current-Limit Gain Error
(MAX8765/MAX8765A Only)
Input Current-Limit Offset
(MAX8765/MAX8765A Only)
CSSP, CSSN Input Voltage
Range
CSSP, CSSN Input Current
(MAX1908/MAX8724 Only)
CSSP Input Current
(MAX8765/MAX8765A Only)
CSSN Input Current
(MAX8765/MAX8765A Only)
CLS Input Range
(MAX1908/MAX8724 Only)
CLS Input Range
(MAX8765/MAX8765A Only)
IINP Transconductance
(MAX1908/MAX8724 Only)
IINP Transconductance
(MAX8765/MAX8765A Only)
IINP Transconductance Error
(MAX8765/MAX8765A Only)
IINP Transconductance Offset
(MAX8765/MAX8765A Only)
IINP Accuracy
mV
%
G
IINP
G
IINP
7.5-
10-
-
2
-
2
8
%
mV
V
µA
µA
µA
V
V
µA/mV
µA/mV
%
µA
%
DCIN
= 0VV
V
CSSP
= V
CSSN
= V
DCIN
> 8V
V
DCIN
= 0V
V
CSSP
= V
CSSN
= 28V
DCIN
= 28VV
V
DCIN
= 0V
V
CSSP
= V
CSSN
= 28V
DCIN
= 28VV
V
CSSP
- V
CSSN
= 75mV
V
CSSP
- V
CCSN
= 75mV
1
.6
1
.1
2.7
2.785
-
7.5
-
12
CSSP
- V
CSSN
= 75mVV
V
CSSP
- V
CSSN
= 37.5mV
7.5-
7.5-
8_______________________________________________________________________________________
/
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETERSYMBOLCONDITIONSM
INT
YPM
AXU
NITS
SUPPLY AND LDO REGULATOR
DCIN Input Voltage Range
V
DCIN
8
2
8V
D
CIN Quiescent Current
I
DCIN
8
.0V < V
DCIN
< 28V
6
m
A
B
ATT Input CurrentI
1
BATT
V
BATT
= 19V, V
DCIN
= 0V
V
BATT
= 2V to 19V, V
DCIN
= 19.3V
5
00
µ
A
LDO Output Voltage
8
V < V
DCIN
< 28V, no load5
.25
5
.55V
LDO Load Regulation
0
< I
LDO
< 10mA
1
00m
V
R
EFERENCE
R
EF Output Voltage
0
< I
REF
< 500µA4
.065
4
.120V
T
RIP POINTS
V
DCIN
falling, referred to V
CSIN
5
0
1
50
B
ATT Power-Fail Threshold
(MAX1908/MAX8724 only)
V
m
V
CSSP
falling, referred to V
CSIN
(MAX8765/MAX8765A only)
5
0
1
50
A
CIN Threshold
ACIN rising (
MAX8765/MAX8765A
only)
2.028
2
.068
A
CIN rising (MAX1908/MAX8724 only)
2.007
2
.089
V
S
WITCHING REGULATOR
D
HI Off-Time
V
BATT
= 16V, V
DCIN
= 19V,
V
CELLS
= V
REFIN
0
.35
0
.45µ
s
D
HI Minimum Off-Time
V
BATT
= 16V, V
DCIN
= 17V,
V
CELLS
= V
REFIN
0
.24
0
.33µ
s
DHI Maximum On-Time
2
.5
7
.5
ms
DHI Maximum Duty Cycle
9
9
%
B
attery Undervoltage Charge
V
BATT
= 3V per cell (RS2 = 15mΩ),
CurrentMAX1908 only, V
BATT
rising
1
50
4
50m
A
B
attery Undervoltage Current
CELLS = GND, MAX1908 only, V
BATT
rising
6.09
6
.30
Threshold
CELLS = open, MAX1908 only, V
BATT
rising
9.12
9
.45V
CELLS = V
REFIN
, MAX1908 only, V
BATT
rising1
2.18
1
2.60
DHI On-Resistance High
V
BST
- V
LX
= 4.5V, I
DHI
= +100mA
7
Ω
DHI On-Resistance Low
V
BST
- V
LX
= 4.5V, I
DHI
= -100mA
3
.5
Ω
D
LO On-Resistance High
V
DLOV
= 4.5V, I
DLO
= +100mA
7
Ω
D
LO On-Resistance Low
V
DLOV
= 4.5V, I
DLO
= -100mA
3
.5Ω
_______________________________________________________________________________________9
/
MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
M
A
X
1
9
0
8
/
M
A
X
8
7
2
4
/
M
A
X
8
7
6
5
/
M
A
X
8
7
6
5
A
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
ERROR AMPLIFIERS
GMV Amplifier Transconductance
GMV
V
V
C
V 16.8V ,
T L
=
LD O
, V
BAT T
=
C EL LS = V
RE F IN
0.0625
SYMBOLCONDITIONSMIN
TYP
MAX
UNITS
0
.250
2
.0
2
.0
6
00
0
.4
(
V
REF IN
/2) +
0.2V
µA/mV
MI Amplifier TransconductanceG
MIG
MS Amplifier Transconductance
GGMS
CCI, CCS, CCV Clamp Voltage
LOGIC LEVELS
CELLS Input Low Voltage
CELLS Input Open Voltage
CELLS Input High Voltage
ICTL
= V V, V
CSIP
- V
CSIN
= 75mV
RE F IN
CLS
= V
REF
, V
CSSP
- V
CSSN
= 75mVV
0
.25V < V
CCV,CCS,CCI
< 2V
C
ELLS = open
.50
.50
150
(V
REFIN
/2) -
0.2V
V
REFIN
- 0.4V
0
A/mVµ
A/mVµ
mV
V
V
V
V
m
A
V
% of
V
REFIN
V
ACOK
= 0.4V, V
ACIN
= 3V
2
8
COK AND SHDNA
COK Input Voltage RangeA
ACOK Sink Current
SHDN Input Voltage Range
SHDN Threshold
1
0
22
L
DO
2
5V
SHDN
falling
Note 1:If both ICTL and VCTL use default mode (connected to LDO), REFIN is not used and can be connected to LDO.
Note 2:Specifications to T
A
= -40°C are guaranteed by design and not production tested.
Typical Operating Characteristics
(Circuit of Figure 1, V
DCIN
= 20V, T
A
= +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
(BATTERY INSERTION AND REMOVAL)
MAX1908 toc01
LOAD-TRANSIENT RESPONSE
(STEP IN-LOAD CURRENT)
MAX1908 toc02
LOAD-TRANSIENT RESPONSE
(STEP IN-LOAD CURRENT)
MAX1908 toc03
I
BATT
2A/div
V
BATT
5V/div
CCV
V
CCI
500mV/div
V
CCV
500mV/div
CCI
ADAPTER
CURRENT
5A/div
LOAD
CURRENT
5A/div
V
BATT
2V/div
V
CCI
500mV/div
V
CCS
500mV/div
CCS
CCI
CCS
CCI
0
0
16.8V
LOAD
CURRENT
5A/div
ADAPTER
CURRENT
5A/div
CHARGE
CURRENT
2A/div
V
BATT
2V/div
1ms/div
ICTL = LDO
CHARGING CURRENT = 3A
V
BATT
= 16.8V
LOAD STEP = 0 TO 4A
I
SOURCE
LIMIT = 5A
0
0
0
ICTL = LDO
VCTL = LDO
1ms/div
1ms/div
ICTL = LDO
CHARGING CURRENT = 3A
V
BATT
= 16.8V
LOAD STEP = 0 TO 4A
I
SOURCE
LIMIT = 5A
10______________________________________________________________________________________
/
分销商库存信息:
MAXIM
MAX8765AETI+TMAX8765AETI+