ADP3605

a 120 mA Switched Capacitor Voltage Inverter with Regulated Output ADP3605 FUNCTIONAL BLOCK DIAGRAM CP+ S PD S1 CP– DN S S3 B S ND S2 DNS S4 VOUT VIN FEATURES Fully Regulated Output Voltage (–3 V and Adjustable) High Output Current: 120 mA Output Accuracy: ؎3% 250 kHz Switching Frequency Low Shutdown Current: 2 ␮A Typical Input Voltage Range from 3 V to 6 V SO-8 and RU-14 Packages –40؇ C to +85؇ C Ambient Temperature Range APPLICATIONS Voltage Inverters Voltage Regulators Computer Peripherals and Add-On Cards Portable Instruments Battery Powered Devices Pagers and Radio Control Receivers Disk Drives Mobile Phones ADP3605 SD OSC CLOCK GEN FEEDBACK CONTROL LOOP VSENSE GND GENERAL DESCRIPTION The ADP3605 is a 120 mA regulated output switched capacitor voltage inverter. It provides a regulated output voltage with minimum voltage loss and requires a minimum number of external components. In addition, the ADP3605 does not require the use of an inductor. Pin-for-pin and functionally compatible with the ADP3604, the internal oscillator of the ADP3605 runs at 500 kHz nominal frequency which produces an output switching frequency of 250 kHz. This allows for the use of smaller charge pump and filter capacitors. The ADP3605 provides an accuracy of ± 3% with a typical shutdown current of 2 µA. It can also operate from a single positive input voltage as low as 3 V. The ADP3605 is offered with the regulation fixed at –3 V or adjustable via external resistors over a –3 V to –6 V ra...