2024年7月18日发(作者：戏雪晴)
Preliminary Datasheet LP6498A
600KHz 36V/1.2A Synchronous Step-down Converter
General Description
The LP6498A is a synchronous step-down
regulator from a high voltage input
ing with an input voltage range from
4.5V to 30V.1.2A continuous output current .The
converter integrates a main switch and a
synchronous rectifier for high efficiency without an
external Schottky diode. LP6498A Requires a
minimum number of readily available standard
external current protection and
thermal shutdown . output short circuit protection.
The LP6498A converters are available in the
industry standard SOT23-6 packages.
Short Circuit Protection
Thermal Fault Protection
SOT23-6 Package
RoHS Compliant and 100% Lead (Pb)-Free
1200mA Load Current
Up to 93% Efficiency
600KHz Switching Frequency
Features
Input Voltage Range: 4.5V to 30V
Output Voltage Range: 0.8V to 12V
Order Information
LP6498A □ □ □
F: Pb-Free
Package Type
Typical Application Circuit
VIN
VIN
22uF
SW
15uH
22uF
ENNC
R1
Vout
GNDFB
B6:SOT23-6
R2
Applications
Car Charger / Adaptor
Pre-Regulator for Linear Regulators
Distributed Power Systems
USB Dedicated Charging Ports (DCP)
Marking Information
Device
LP6498AB6F
Marking
LPS
AOYWX
Package
SOT23-6
Shipping
3K/REEL
Marking indication:
Y: Year code. W: Week code. X: Batch numbers.
LP6498A-00 Mar.-2018
Functional Pin Description
Package Type
NC1
Preliminary Datasheet LP6498A
SOT23-6(Top View)
6SW
Pin Configurations
GND2
5VIN
FB3
4
EN
Pin Description
PIN
1
2
3
4
5
6
Name
NC
GND
FB
EN
VIN
SW
Description
No connection.
Ground.
Feedback Input.
Vout=(
Enable Pin
Voltage supply.
Switch Mode Connection to Inductor. This pin connects to the drains of the
internal main and synchronous power MOSFET switches.
R1
+1)×V
FB
R2
LP6498A-00 Mar.-2018
Function Diagram
VIN
Preliminary Datasheet LP6498A
CURRENT
SENSE
EN
REFLDO
ISUM
SOFT
START
FB
0.8V
EA
OSC
PG
PWM
CONTROL
SW
LOGICDRIVER
NG
PROTECT
GND
Absolute Maximum Ratings
Note 1
VINSW EN to GND ---------------------------------------------------------------------------------------------- -0.3V to 36V
VOUTLEDRVFB to GND --------------------------------------------------------------------------------------- -0.3V to 6.5V
Maximum Junction Temperature -------------------------------------------------------------------------------------- 150°C
Storage Temperature ------------------------------------------------------------------------------------------ -65℃ to 165℃
Operating Ambient Temperature Range (TA) ------------------------------------------------------------- -20℃ to 85°C
Maximum Soldering Temperature (at leads, 10 sec) ------------------------------------------------------------- 260°C
Note 1. 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.
Thermal Information
Maximum Power Dissipation (SOT23-6, P
D
, T
A
=25℃) ------------------------------------------------------------ 0.6W
Thermal Resistance (SOT23-6, θ
JA
) ------------------------------------------------------------------------------ 200℃/W
ESD Susceptibility
HBM(Human Body Mode) -------------------------------------------------------------------------------------------------- 2KV
MM(Machine Mode) --------------------------------------------------------------------------------------------------------- 200V
LP6498A-00 Mar.-2018
Electrical Characteristics
V
IN
=12V, V
EN
=5V, T
A
=25℃, unless otherwise noted
Symbol Parameter
Input Voltage
Preliminary Datasheet LP6498A
Condition Min Typ Max Units
V
IN
V
FB
I
Q
V
UVLO
V
UVLO-HYS
Iload=0mA
V
IN
Rising
T
J
=25℃
4.5
0.784
0.8
8
4
0.5
2.4
1.6
240
130
6
0.8
600
150
20
30
0.816
V
V
mA
V
V
Feedback Threshold Voltage Accuracy
Quiescent Current
V
IN
Under Voltage Lockout Threshold
UVLO Hysteresis
I
LIM
P-Channel Current Limit
A
T
J
=150℃
mΩ
mΩ
mS
mS
KHz
℃
℃
R
DS(ON)_H
R
DS(ON)_L
T
HICCUP
T
SS
f
OSC
t
SD
T
HYS
High-Side Switch On Resistance
Low-Side Switch On Resistance
Hiccup Time
Soft-start Time
Oscillator Frequency
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
LP6498A-00 Mar.-2018
Typical Operating Characteristics
Preliminary Datasheet LP6498A
Efficiency VS Iout
100
90
80
E
f
f
i
c
i
e
n
c
y
(
%
)
70
60
50
40
30
20
10
0
0.000.200.400.600.801.00
IOut(A)
VIN=8V
VIN=12V
VIN=18V
VIN=24V
1.201.40
LP6498A-00 Mar.-2018
Operation Information
Functional Description
The LP6498A is a switch-mode step-down DC-DC converter.
The device operates at a fixed 600KHz switching frequency,
and uses a slope compensated current mode architecture.
This step-down DC-DC converter can supply up to 1.2A
output current at input voltage range from 4.5V to 30V. It
minimizes external component size and optimizes efficiency
at the heavy load range. The integrated slope compensation
allows the device to remain stable over a wider range of
inductor values so that smaller values (6.8μH to 22μH) with
lower DCR can be used to achieve higher efficiency.
Preliminary Datasheet LP6498A
Layout Guidance
When laying out the PCB board, the following layout guideline
should be followed to ensure proper operation of the
LP6498A:
1. The power traces, including the GND trace, the SW trace
and the IN trace should be kept short, direct and wide to allow
large current flow. The L connection to the SW pins should be
as short as possible. Use several VIN pads when routing
between layers.
2. The input capacitor (C
IN
) should connect as closely as
possible to VIN and GND to get good power filtering.
LP6498A-00 Mar.-2018
Packaging Information
Preliminary Datasheet LP6498A
SOT23-6
LP6498A-00 Mar.-2018
2024年7月18日发(作者：戏雪晴)
Preliminary Datasheet LP6498A
600KHz 36V/1.2A Synchronous Step-down Converter
General Description
The LP6498A is a synchronous step-down
regulator from a high voltage input
ing with an input voltage range from
4.5V to 30V.1.2A continuous output current .The
converter integrates a main switch and a
synchronous rectifier for high efficiency without an
external Schottky diode. LP6498A Requires a
minimum number of readily available standard
external current protection and
thermal shutdown . output short circuit protection.
The LP6498A converters are available in the
industry standard SOT23-6 packages.
Short Circuit Protection
Thermal Fault Protection
SOT23-6 Package
RoHS Compliant and 100% Lead (Pb)-Free
1200mA Load Current
Up to 93% Efficiency
600KHz Switching Frequency
Features
Input Voltage Range: 4.5V to 30V
Output Voltage Range: 0.8V to 12V
Order Information
LP6498A □ □ □
F: Pb-Free
Package Type
Typical Application Circuit
VIN
VIN
22uF
SW
15uH
22uF
ENNC
R1
Vout
GNDFB
B6:SOT23-6
R2
Applications
Car Charger / Adaptor
Pre-Regulator for Linear Regulators
Distributed Power Systems
USB Dedicated Charging Ports (DCP)
Marking Information
Device
LP6498AB6F
Marking
LPS
AOYWX
Package
SOT23-6
Shipping
3K/REEL
Marking indication:
Y: Year code. W: Week code. X: Batch numbers.
LP6498A-00 Mar.-2018
Functional Pin Description
Package Type
NC1
Preliminary Datasheet LP6498A
SOT23-6(Top View)
6SW
Pin Configurations
GND2
5VIN
FB3
4
EN
Pin Description
PIN
1
2
3
4
5
6
Name
NC
GND
FB
EN
VIN
SW
Description
No connection.
Ground.
Feedback Input.
Vout=(
Enable Pin
Voltage supply.
Switch Mode Connection to Inductor. This pin connects to the drains of the
internal main and synchronous power MOSFET switches.
R1
+1)×V
FB
R2
LP6498A-00 Mar.-2018
Function Diagram
VIN
Preliminary Datasheet LP6498A
CURRENT
SENSE
EN
REFLDO
ISUM
SOFT
START
FB
0.8V
EA
OSC
PG
PWM
CONTROL
SW
LOGICDRIVER
NG
PROTECT
GND
Absolute Maximum Ratings
Note 1
VINSW EN to GND ---------------------------------------------------------------------------------------------- -0.3V to 36V
VOUTLEDRVFB to GND --------------------------------------------------------------------------------------- -0.3V to 6.5V
Maximum Junction Temperature -------------------------------------------------------------------------------------- 150°C
Storage Temperature ------------------------------------------------------------------------------------------ -65℃ to 165℃
Operating Ambient Temperature Range (TA) ------------------------------------------------------------- -20℃ to 85°C
Maximum Soldering Temperature (at leads, 10 sec) ------------------------------------------------------------- 260°C
Note 1. 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.
Thermal Information
Maximum Power Dissipation (SOT23-6, P
D
, T
A
=25℃) ------------------------------------------------------------ 0.6W
Thermal Resistance (SOT23-6, θ
JA
) ------------------------------------------------------------------------------ 200℃/W
ESD Susceptibility
HBM(Human Body Mode) -------------------------------------------------------------------------------------------------- 2KV
MM(Machine Mode) --------------------------------------------------------------------------------------------------------- 200V
LP6498A-00 Mar.-2018
Electrical Characteristics
V
IN
=12V, V
EN
=5V, T
A
=25℃, unless otherwise noted
Symbol Parameter
Input Voltage
Preliminary Datasheet LP6498A
Condition Min Typ Max Units
V
IN
V
FB
I
Q
V
UVLO
V
UVLO-HYS
Iload=0mA
V
IN
Rising
T
J
=25℃
4.5
0.784
0.8
8
4
0.5
2.4
1.6
240
130
6
0.8
600
150
20
30
0.816
V
V
mA
V
V
Feedback Threshold Voltage Accuracy
Quiescent Current
V
IN
Under Voltage Lockout Threshold
UVLO Hysteresis
I
LIM
P-Channel Current Limit
A
T
J
=150℃
mΩ
mΩ
mS
mS
KHz
℃
℃
R
DS(ON)_H
R
DS(ON)_L
T
HICCUP
T
SS
f
OSC
t
SD
T
HYS
High-Side Switch On Resistance
Low-Side Switch On Resistance
Hiccup Time
Soft-start Time
Oscillator Frequency
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
LP6498A-00 Mar.-2018
Typical Operating Characteristics
Preliminary Datasheet LP6498A
Efficiency VS Iout
100
90
80
E
f
f
i
c
i
e
n
c
y
(
%
)
70
60
50
40
30
20
10
0
0.000.200.400.600.801.00
IOut(A)
VIN=8V
VIN=12V
VIN=18V
VIN=24V
1.201.40
LP6498A-00 Mar.-2018
Operation Information
Functional Description
The LP6498A is a switch-mode step-down DC-DC converter.
The device operates at a fixed 600KHz switching frequency,
and uses a slope compensated current mode architecture.
This step-down DC-DC converter can supply up to 1.2A
output current at input voltage range from 4.5V to 30V. It
minimizes external component size and optimizes efficiency
at the heavy load range. The integrated slope compensation
allows the device to remain stable over a wider range of
inductor values so that smaller values (6.8μH to 22μH) with
lower DCR can be used to achieve higher efficiency.
Preliminary Datasheet LP6498A
Layout Guidance
When laying out the PCB board, the following layout guideline
should be followed to ensure proper operation of the
LP6498A:
1. The power traces, including the GND trace, the SW trace
and the IN trace should be kept short, direct and wide to allow
large current flow. The L connection to the SW pins should be
as short as possible. Use several VIN pads when routing
between layers.
2. The input capacitor (C
IN
) should connect as closely as
possible to VIN and GND to get good power filtering.
LP6498A-00 Mar.-2018
Packaging Information
Preliminary Datasheet LP6498A
SOT23-6
LP6498A-00 Mar.-2018