Micropower, Regulated 3.3V/5V Charge Pump with Shutdown in SOT-23

The LTC1754 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 VIN and VOUT) 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™ switched capacitor voltage doubler to produce a regulated output. It has thermal shutdown capability and can survive a continuous short circuit from VOUT to GND.

The LTC1754 is available in a 6-pin SOT-23 package.

Applications

* SIM Interface Supplies for GSM Cellular Telephones

* White LED Power Supplies

* Li-Ion Battery Backup Supplies

* Handheld Computers

* Smart Card Readers

* PCMCIA Local 5V Supplies

* Ultralow Power: IIN = 13µA

* Regulated Output Voltage: 3.3V ±4%, 5V ±4%

* 5V Output Current: 50mA (VIN ≥ 3.0V)

* 3.3V Output Current: 40mA (VIN ≥ 2.5V)

* 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