The KF9902B is a low noise， constant frequency (1.2MHz) switched capacitor voltage doubler. It produce a regulated output voltage from a 1.8V to 5V input with up to 100mA of output current. Low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make the KF9902B ideally suited for small,battery-

powered applications.

The KF9902B have thermal shutdown capability and can survive a continuous short circuit from VOUT to GND. Built-in 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. The KF9902B is available in the 6-pin SOT23-6.

  Features

Fixed 3.3V土4% Output

VIN Range: 1.8V to 5V

Output Current: 100mA

Constant Frequency Operation at All Loads

Low Noise Constant Frequency (1.2MHz) Operation

Automatic Soft-Start Reduces Inrush Current

Shutdown Current <1μA

Short-Circuit Protection

No Inductors

Available in Low Profile 6-Lead SOT23 Package

  Application

2 AA Cell to 3.3V

USB On-The-Go Devices

White L .ED Drivers

Handheld Devices

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