LTC1754-5_15 Datasheet, PDF (1/12 Pages) Linear Technology – Micropower, Regulated 3.3V/5V Charge Pump with Shutdown in SOT-23

LTC1754-3.3/LTC1754-5
Micropower, Regulated
3.3V/5V Charge Pump with
Shutdown in SOT-23
FEATURES
s _{Ultralow Power: IIN = 13µA}
s _{Regulated Output Voltage: 3.3V ±4%, 5V ±4%}
s _{5V Output Current: 50mA (VIN ≥ 3.0V)}
s _{3.3V Output Current: 40mA (VIN ≥ 2.5V)}
s _{No Inductors Needed}
s _{Very Low Shutdown Current: <1µA}
s _{Shutdown Disconnects Load from VIN}
s _{Internal Oscillator: 600kHz}
s _{Short-Circuit and Overtemperature Protected}
s _{Ultrasmall Application Circuit: (0.052 Inch}²₎
s _{6-Pin SOT-23 Package}
U
APPLICATIO S
s _{SIM Interface Supplies for GSM Cellular Telephones}
s _{White LED Power Supplies}
s _{Li-Ion Battery Backup Supplies}
s _{Handheld Computers}
s _{Smart Card Readers}
s _{PCMCIA Local 5V Supplies}
DESCRIPTIO
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
small bypass capacitors at V_IN and V_OUT) make the LTC1754
ideally suited for small, battery-powered applications. The
total component area of the application circuit shown
below is only 0.052 inch².
The LTC1754 operates as a Burst Mode^TM switched capaci-
tor voltage doubler to produce a regulated output. It has
thermal shutdown capability and can survive a continuous
short circuit from V_OUT to GND.
The LTC1754 is available in a 6-pin SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
V_OUT
10µF
ON/OFF
1
V_OUT
C^{+ 6}
LTC1754-X
2
5
GND V_IN
3 _{SHDN C –} 4
1µF
V_IN
10µF
1754 TA01
Regulated 3.3V Output from 2V to 4.4V Input
V_OUT = 3.3V ± 4%
I_OUT = 0mA TO 20mA, V_IN > 2.0V
I_OUT = 0mA TO 40mA, V_IN > 2.5V
Regulated 5V Output from 2.7V to 5.5V Input
V_OUT = 5V ± 4%
I_OUT = 0mA TO 25mA, V_IN > 2.7V
I_OUT = 0mA TO 50mA, V_IN > 3.0V
LTC1754-3.3
Output Voltage vs Supply Voltage
3.40
I_OUT = 20mA
C_OUT = 10µf
C_FLY = 1µF
3.35
T_A = 85°C
3.30
T_A = 25°C
T_A = –40°C
3.25
3.20
2.0
2.5
3.0
3.5
4.0
4.5
SUPPLY VOLTAGE (V)
1754 TA02
LTC1754-5
Output Voltage vs Supply Voltage
5.15
I_OUT = 25mA
C_OUT = 10µF
5.10 _{CFLY = 1µF}
5.05
T_A = 25°C
5.00
4.95
T_A = 85°C
T_A = –40°C
4.90
4.85
2.5
3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
5.0 5.5
1574 TA03
1