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ADP3603AR

Switched Capacitor Voltage Converter with Regulated Output

Analog Devices 

a

Switched Capacitor Voltage Converter

with Regulated Output

ADP3603*

FEATURES

Fully Regulated Output

High Output Current: 50 mA

120 mA Version (ADP3604) Is Also Available

Outstanding Precision: ؎3% Output Accuracy

Input Voltage Range: +4.5 V to +6.0 V

Output Voltage: –3.0 V (Regulated)

High Switching Frequency: 120 kHz (240 kHz Internal

Oscillator)

Shutdown Capability

Small Outline 8-Pin SOIC Package

APPLICATIONS

Voltage Inverters

Negative Voltage Regulators

Computer Peripherals and Add-On Cards

Portable Instruments

Battery Powered Devices

Pagers and Radio Control Receivers

Disk Drives

Mobile Phones

GENERAL DESCRIPTION

The ADP3603 switched capacitor voltage converter provides

a regulated output voltage with minimum voltage loss and re-

quires a minimum number of external components. In addition,

the ADP3603 does not require the use of an inductor. The

ADP3603 provides up to 50 mA of output current with ± 3%

output accuracy.

The internal oscillator runs at 240 kHz nominal frequency

which produces an output switching frequency of 120 kHz,

allowing the use of small charge pump and filter capacitors.

The ADP3603 is primarily designed for use as a high fre-

quency negative voltage regulator/inverter. The output voltages

of the ADP3603 can range from –1.2 V to –4.0 V, nominally

–3.0 V. For other output voltages, contact the factory.

The ADP3603 dissipates less than 150 mW of power and fea-

tures fast shutdown mode capability (<5 ms) that also drops the

quiescent current to 1.4 mA (typ). For a higher output current

(120 mA) version, see the ADP3604.

FUNCTIONAL BLOCK DIAGRAM

VIN 8

SD 4

CP+

S PD

1

S1

OSC

CLOCK

GEN

S ND

3

CP–

S2

D NS

S3

B

DNS

S4

FEEDBACK

CONTROL

LOOP

7 VOUT

2 GND

5 VSENSE

PIN CONFIGURATION

8-Pin SOIC

(SO-8)

CP+ 1

8 VIN

GND 2

ADP3603

TOP VIEW

7 VOUT

CP– 3 (Not to Scale) 6 NC

SHUTDOWN 4

5 VSENSE

NC = NO CONNECT

VIN +4.5 – +6V

OFF

ON

0

C1

4.7µF†

C2

4.7µF†

SHUTDOWN

VOUT –3.0V

8

7

C3

1

4.7µF†

ADP3603

3

VSENSE

5

4

2

NOTE

C2: SPRAGUE, 293D105X0010B2W

C1, C3: TOKIN, 1E105ZY5UC205F

†FOR BEST PERFORMANCE 10µF IS RECOMMENDED

Figure 1. Typical Application Circuit

*Patent pending.

REV. 0

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.

© Analog Devices, Inc., 1996

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

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