XA2320

XA2320 Low Noise, Regulated Charge Pump DC/DC Converter Features Fixed 5V ± 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 <1µA Short-Circuit Protection No Inductors Available in Low Profile 6-Lead SOT23 Package Application White LED Backlighting Li-Ion Battery Backup Supplies Local 3V to 5V Conversion Smart Card Readers PCMCIA Local 5V Supplies Description The XA2320 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 XA2320 ideally suited for small, battery-powered applications. A new charge-pump architecture maintains constant switching frequency to zero load and reduces both output and in...