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ADP3605
(Rev.:2012)

120 mA Switched Capacitor Voltage Inverter with Regulated Output

Analog Devices 

Data Sheet

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

120 mA Switched Capacitor

Voltage Inverter with Regulated Output

ADP3605

FUNCTIONAL BLOCK DIAGRAM

CP+

1

CP–

3

VIN 8

SPD

S1

ADP3605

SND

S2

DNS

S3

B

DNS

S4

7 VOUT

SD 4

OSC

CLOCK

GEN

FEEDBACK

CONTROL

LOOP

5 VSENSE

2

GND

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.

VIN

*CIN +

4.7µF

*CP +

4.7µF

OFF

ON

0

8 VIN

1 CP+

VOUT 7

ADP3605

3 CP–

4 SD VSENSE 5

GND

2

–3.0V

*CO

+ 4.7µF

R1

19kΩ

*FOR BEST PERFORMANCE, 10µF IS RECOMMENDED

CP: SPRAGUE, 293D475X0010B2W

CIN, CO: TOKIN, 1E475ZY5UC205F

Figure 2. Typical Application Circuit

Rev. B

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Tel: 781.329.4700 ©1998–2012 Analog Devices, Inc. All rights reserved.

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