LTC1754-3.3/LTC1754-5
Micropower, Regulated
3.3V/5V Charge Pump with
Shutdown in SOT-23
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FEATURES
DESCRIPTIO
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Ultralow Power: IIN = 13
µA
The LTC®1754 is a micropower charge pump DC/DC
converter that produces a regulated output. The input
voltage range is 2V to 4.4V for 3.3V output and 2.7V to
5.5V for 5V output. Extremely low operating current and a
low external parts count (one flying capacitor and two
smallbypasscapacitorsatVINandVOUT)maketheLTC1754
ideally suited for small, battery-powered applications. The
total component area of the application circuit shown
below is only 0.052 inch2.
TheLTC1754operatesasaBurstModeTM switchedcapaci-
tor voltage doubler to produce a regulated output. It has
thermalshutdowncapabilityandcansurviveacontinuous
short circuit from VOUT to GND.
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Regulated Output Voltage: 3.3V
±
4%, 5V
3.0V)
2.5V)
±4%
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■
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5V Output Current: 50mA (VIN
≥
3.3V Output Current: 40mA (VIN
≥
No Inductors Needed
Very Low Shutdown Current: <1µA
Shutdown Disconnects Load from VIN
Internal Oscillator: 600kHz
Short-Circuit and Overtemperature Protected
Ultrasmall Application Circuit: (0.052 Inch2)
6-Pin SOT-23 Package
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APPLICATIO S
The LTC1754 is available in a 6-pin SOT-23 package.
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SIM Interface Supplies for GSM Cellular Telephones
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
White LED Power Supplies
Burst Mode is a trademark of Linear Technology Corporation.
■
Li-Ion Battery Backup Supplies
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Handheld Computers
Smart Card Readers
PCMCIA Local 5V Supplies
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TYPICAL APPLICATIO
LTC1754-3.3
Output Voltage vs Supply Voltage
LTC1754-5
Output Voltage vs Supply Voltage
1
2
3
6
5
4
+
V
OUT
V
C
OUT
LTC1754-X
3.40
3.35
3.30
3.25
3.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
1µF
10µF
I
C
C
= 20mA
= 10µf
= 1µF
OUT
OUT
FLY
I
C
C
= 25mA
= 10µF
= 1µF
OUT
OUT
FLY
V
GND
V
IN
IN
10µF
–
ON/OFF
SHDN
C
1754 TA01
T
= 85°C
= 25°C
A
A
T
A
= 85°C
T
= 25°C
A
Regulated 3.3V Output from 2V to 4.4V Input
T
V
= 3.3V ±4%
OUT
T
= –40°C
T
A
= –40°C
A
I
I
= 0mA TO 20mA, V > 2.0V
IN
= 0mA TO 40mA, V > 2.5V
OUT
OUT
IN
Regulated 5V Output from 2.7V to 5.5V Input
V
= 5V ±4%
OUT
I
I
= 0mA TO 25mA, V > 2.7V
IN
= 0mA TO 50mA, V > 3.0V
IN
OUT
OUT
2.0
2.5
3.0
3.5
4.0
4.5
2.5
3.5
4.0
4.5
5.0
5.5
3.0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
1754 TA02
1574 TA03
1