Features

Fixed 5V土4% Output

VIN Range: 2.7V to 5V

Output Current: Up to 250mA

Constant Frequency Operation at All Loads

Low Noise Constant Frequency (1.2MHz)Operation

Automatic Soft- Start Reduces Inrush Current

Shutdown Current <1A

Short-Circuit Pratection

No Inductors

Available in Low Profile 6-L ead SOT23 Package (SOT23-6)

  Application

White LED Backlighting

Li-lon Battery Backup Supplies

Local 3V to 5V Conversion

Smart Card Readers

PCMCIA Local 5V Supplies

  Description

(1.2MHz) switched capacitor voltage doubler. It produce a regulated output voltage from a 2.7V to 4.5V input with up to 250mA of output current. Low external parts count (one flying capacitor and two small bypass capacitors at VIN and small, battery-powered applications. A new charge-pump architecture maintains constant switching frequency to zero load and reduces both output and input ripple. The can survive a continuous short circuit from VOUT to GND. Builtin soft-start circuitry prevents excessive inrush current during start-up. High switching frequency enables the use of small ceramic capacitors. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to <1uA

Features

Fixed 5V土4% Output

VIN Range: 2.7V to 5V

Output Current: Up to 250mA

Constant Frequency Operation at All Loads

Low Noise Constant Frequency (1.2MHz)Operation

Automatic Soft- Start Reduces Inrush Current

Shutdown Current <1A

Short-Circuit Pratection

No Inductors

Available in Low Profile 6-L ead SOT23 Package (SOT23-6)

DC/DC升压IC

DC/DC升压IC

DC/DC升压IC DC/DC升压IC