1

LTC1986

s

s

Step-Up Charge Pump Generates 5V

s

Output Current: 10mA

s

s

Ultralow Power

Operating Current: 14

Shutdown Current: <1

s

No Inductors

s

Short-Circuit/Thermal Protected

s

Switching Frequency: 900kHz

s

Soft-Start Limits Inrush Current at Turn-On

s

Output Driven to Ground During Shutdown

s

s

6-Lead SOT-23 Package

The LTC

converter that provides power for either 3V or 5V GSM

voltage range is 2.6V to 4.4V and the part can provide

as low as 2.6V by providing a boost feature in 3V mode. In

Extremely low operating current (14

µA typical with no

load) and low external parts count make the part ideally

suited for small, light load battery-powered applications.

The total PCB area of the application circuit shown below

current limiting, undervoltage lockout, short circuit and

thermal overload protection. The LTC1986 is available in

a 6-lead SOT-23 package.

s

GSM Cellular Telephones

s

PCS/DCS Cellular Telephones

s

Portable POS Terminals

3V/5V SIM Power Supply

in SOT-23

, LTC and LT are registered trademarks of Linear Technology Corporation.

GND

MODE

1

2

3

6

5

4

GSM

CONTROLLER

2.2

µF

0.047

µF

0.1

µF

LTC1986

750k

1M

3/5

SHDN

1986 TA01

SHDN

0

0

1

1

3/5

0

1

0

1

MODE

SHUTDOWN

SHUTDOWN

3V/5V SIM Power Supply

INPUT VOLTAGE (V)

2.5

4

5

4.5

1986 TA02

3

2

3.0

3.5

4.0

6

5V MODE

3V MODE

Output Voltage vs Input Voltage

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO