ADP3605| Datasheet

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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

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 uA. 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 range.

VIN *CIN 4.7 F

+ *CP 4.7 F +

VIN CP+

VOUT +

3.0V *CO 4.7 F

ADP3605-3
CP

OFF

SD ON 0

GND

VSENSE

*FOR BEST PERFORMANCE, 10 F IS RECOMMENDED CP : SPRAGUE, 293D475X0010B2W CIN, CO: TOKIN, 1E475ZY5UC205F

Figure 1. Typical Application Circuit

REV. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 1999