The KF9902 is a low noise, constant frequency (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 VOUT) make the KF9902 ideally suited for small, battery-powered applications.
A new charge-pump architecture maintains constant switching frequency to zero load and reduces both output and input ripple. The KF9902 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.
The KF9902 is available in the 6-pin SOT23 package.
Features
Fixed 5V土4% Output
VIN Range: 2.7V to 5V
Output Current: Up to 250mA
Low Noise Constant Frequency Operation
Shutdown Current <1μA
Short-Circuit Protection
No Inductors
Available in Low Profile 6-L ead SOT23 Package
Application
White LED Backlighting
Li-lon Battery Backup Supplies
Local 3V to 5V Conversion
Smart Card Readers
PCMCIA Local 5V Supplies