120 mA Switched Capacitor

Voltage Inverter with Regulated Output

Data Sheet

ADP3605

Rev. B

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FEATURES

Fully regulated adjustable output voltage

High output current: 120 mA

Output accuracy: ±3%

250 kHz switching frequency

Low shutdown current: 2 µA typical

Input voltage range: 3 V to 6 V

8-Lead SOIC package

−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

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

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 a 500 kHz nominal

frequency that 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 adjustable

via external resistors over a −3 V to −6 V range.

Figure 2. Typical Application Circuit

8

1

2

7

S P D

S1

S3

B

S2

S4

S N D

D N S

D N S

OSC

CLOCK

GEN

SD

GND

ADP3605

3

4

5

FEEDBACK

CONTROL

LOOP

8

7

1

3

4

5

2

+

+

+

–3.0V

4.7µF

4.7µF

4.7µF

GND

ADP3605

SD

R1

19kΩ

OFF

*FOR BEST PERFORMANCE, 10µF IS RECOMMENDED

ON

0