Part Number: PS3120A
Function: Low noise switched capacitor voltage doubler
Package: SOT-23-6L type
Manufacturer: Pulan Technology
Image
Description
The PS3120A is a low noise switched capacitor voltage doubler. It produces a regulated output voltage from a 2.7V to 4.5V input. Low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make the PS3120A ideally suited for small, battery-powered applications. The PS3120A have thermal shutdown capability and can survive a continuous short circuit from VOUT to GND. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to <1μA.
Odering Information
Features
1. Fixed 4.94V±3% Output
2. VIN Range: 2.7V to 4.5V
3. Output Current: Up to 110mA (VIN≥3V), Up to 230mA (VIN≥3.6V)
4. Low Noise Constant Frequency (360kHz) Operation
5. Shutdown Current <1μA
6. No Inductors
Pinout
Applications
1. White LED Backlighting
2. Li-Ion Battery Backup Supplies
3. Smart Card Readers
4. PCMCIA Local 5V Supplies
Circuits
The PS3120A use a switched capacitor charge pump to boost VIN to a regulated output voltage. Regulation is achieved by sensing the output voltage through an internal resistor divider and modulating the charge pump output current based on the error signal. A 2-phase nonoverlapping clock activates the charge pump switches. The flying capacitor is charged from VIN on the first phase of the clock. On the second phase of the clock it is stacked in series with VIN and connected to VOUT. This sequence of charging and discharging the flying capacitor continues at a free running frequency of 360kHz (typ).
PS3120A Datasheet
Other data sheets are available within the file:
