2024年3月28日发(作者：豆惜蕊)
ST619LB
SERIES
DC-DC CONVERTER REGULATED 5V CHARGE PUMP
s
REGULATED 5V ±4% CHARGE PUMP
s
s
s
s
s
s
OUTPUT CURRENT GUARANTEED OVER
TEMPERATURE : 20mA (V
I
≥ 2V ),
30mA (V
I
≥ 3V )
NO INDUCTORS; VERY LOW EMI NOISE
USES SMALL, INEXPENSIVE CAPACITORS
LOGIC CONTROLLED 1µA MAX
SHUT-DOWN SUPPLY CURRENT
SHUT DOWN DISCONNECTS LOAD FROM
INPUT
AVAILABLE IN SO-8 AND DIP-8 PACKAGES
DIP-8SO-8
DESCRIPTION
The ST619LB is a step-up charge pump DC-DC
converter which delivers a regulated 5V ±4%
output at 30mA and over temperature. The input
voltage range is 2V to 3.6V (two battery cells).
It requires only four external capacitor: two 0.22µF
flying capacitors, and 10µF capacitors at the input
and output.
Low operating supply current (typ 200µA) make
the device ideal for small, portable and battery
powered applications. When shut down the load
is disconnected from the input and the supply
current is typically 0.02µA. The ST619LB is
available in SO-8 and DIP-8 packages.
SCHEMATIC DIAGRAM
May 20011/9
ST619LB SERIES
OPERATING PRINCIPLE
The ST619LB is able to provide a regulated 5V
output from a 2V to 3.6V (two battery cells) input.
Internal charge pump and external capacitors
generate the 5V output, eliminating the need for
inductors. The output voltage is regulated to 5V,
±4% by a pulse skipping controller that turns on
the charge pump when the output voltage begins
to drop. To maintain the greatest efficiency the
internal charge pump of the device operates as a
voltage doubler when V
I
ranges from 3.0V to 3.6V
and as a voltage tripler when V
I
ranges from 2.0V
to 2.5V.
When V
I
ranges from 2.5V to 3.0V , the ST619LB
switches between doubler and tripler mode on
alternating cycles, making a 2.5 x V
I
charge pump.
To further enhance the efficiency over the input
range, an internal comparator selects the higher of
V
I
or V
O
to run the ST619LB’s circuitry. With V
I
=
2V and I
O
= 20mA the typical efficiency value is
80%.
In tripler mode (see block diagram), when the S1
switches close, the S2 switches open and
ABSOLUTE MAXIMUM RATINGS
Symbol
V
I
V
O
V
SHDN
I
O
T
stg
T
op
DC Input Voltage
Output Voltage
Shutdown Input Voltage
Output Current Continuous
Storage Temperature Range
Operating Junction Temperature Range
Parameter²Value
-0.3 to 5.5
-0.3 to 5.5
-0.3 to (V
I
+ 0.3)
120
-55 to +150
-40 to +85
Unit
V
V
V
mA
°C
°C
capacitors C1 and C2 charge up to V
I
. On the
second half of the cycle, C1 and C2 are connected
in series between IN and OUT when the S1
switches open and S2 switches close. In the
doubler mode only C2 is used. During one
oscillator cycle, energy is transferred from the
input to the charge pump capacitors, and then
from the charge pump capacitors to the output
capacitors and load. The number of cycles within
a given time frame increases as the load
increases or as the input supply voltage
decreases. In the limiting case , the charge pumps
operate continuously, and the oscillator frequency
is nominally 500kHz.
Shut Down Mode
The ST619LB enters low power shut down mode
when SHDN is a logic high. In shut down mode,
OUT is disconnected from the IN and V
O
falls to
0V. The SHDN pin is connected to ground for
normal operation. SHDN is a CMOS compatible
input.
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
Symbol
R
thj-amb
Parameter
Thermal Resistance Junction-ambient (*)
SO-8
160
DIP-8
100
Unit
°C/W
(*) This value depends from thermal design of PCB on which the device is mounted.
2/9
2024年3月28日发(作者：豆惜蕊)
ST619LB
SERIES
DC-DC CONVERTER REGULATED 5V CHARGE PUMP
s
REGULATED 5V ±4% CHARGE PUMP
s
s
s
s
s
s
OUTPUT CURRENT GUARANTEED OVER
TEMPERATURE : 20mA (V
I
≥ 2V ),
30mA (V
I
≥ 3V )
NO INDUCTORS; VERY LOW EMI NOISE
USES SMALL, INEXPENSIVE CAPACITORS
LOGIC CONTROLLED 1µA MAX
SHUT-DOWN SUPPLY CURRENT
SHUT DOWN DISCONNECTS LOAD FROM
INPUT
AVAILABLE IN SO-8 AND DIP-8 PACKAGES
DIP-8SO-8
DESCRIPTION
The ST619LB is a step-up charge pump DC-DC
converter which delivers a regulated 5V ±4%
output at 30mA and over temperature. The input
voltage range is 2V to 3.6V (two battery cells).
It requires only four external capacitor: two 0.22µF
flying capacitors, and 10µF capacitors at the input
and output.
Low operating supply current (typ 200µA) make
the device ideal for small, portable and battery
powered applications. When shut down the load
is disconnected from the input and the supply
current is typically 0.02µA. The ST619LB is
available in SO-8 and DIP-8 packages.
SCHEMATIC DIAGRAM
May 20011/9
ST619LB SERIES
OPERATING PRINCIPLE
The ST619LB is able to provide a regulated 5V
output from a 2V to 3.6V (two battery cells) input.
Internal charge pump and external capacitors
generate the 5V output, eliminating the need for
inductors. The output voltage is regulated to 5V,
±4% by a pulse skipping controller that turns on
the charge pump when the output voltage begins
to drop. To maintain the greatest efficiency the
internal charge pump of the device operates as a
voltage doubler when V
I
ranges from 3.0V to 3.6V
and as a voltage tripler when V
I
ranges from 2.0V
to 2.5V.
When V
I
ranges from 2.5V to 3.0V , the ST619LB
switches between doubler and tripler mode on
alternating cycles, making a 2.5 x V
I
charge pump.
To further enhance the efficiency over the input
range, an internal comparator selects the higher of
V
I
or V
O
to run the ST619LB’s circuitry. With V
I
=
2V and I
O
= 20mA the typical efficiency value is
80%.
In tripler mode (see block diagram), when the S1
switches close, the S2 switches open and
ABSOLUTE MAXIMUM RATINGS
Symbol
V
I
V
O
V
SHDN
I
O
T
stg
T
op
DC Input Voltage
Output Voltage
Shutdown Input Voltage
Output Current Continuous
Storage Temperature Range
Operating Junction Temperature Range
Parameter²Value
-0.3 to 5.5
-0.3 to 5.5
-0.3 to (V
I
+ 0.3)
120
-55 to +150
-40 to +85
Unit
V
V
V
mA
°C
°C
capacitors C1 and C2 charge up to V
I
. On the
second half of the cycle, C1 and C2 are connected
in series between IN and OUT when the S1
switches open and S2 switches close. In the
doubler mode only C2 is used. During one
oscillator cycle, energy is transferred from the
input to the charge pump capacitors, and then
from the charge pump capacitors to the output
capacitors and load. The number of cycles within
a given time frame increases as the load
increases or as the input supply voltage
decreases. In the limiting case , the charge pumps
operate continuously, and the oscillator frequency
is nominally 500kHz.
Shut Down Mode
The ST619LB enters low power shut down mode
when SHDN is a logic high. In shut down mode,
OUT is disconnected from the IN and V
O
falls to
0V. The SHDN pin is connected to ground for
normal operation. SHDN is a CMOS compatible
input.
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
Symbol
R
thj-amb
Parameter
Thermal Resistance Junction-ambient (*)
SO-8
160
DIP-8
100
Unit
°C/W
(*) This value depends from thermal design of PCB on which the device is mounted.
2/9