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ADP1109AN-33

Micropower Low Cost Fixed 3.3 V, 5 V, 12 V and Adjustable DC-to-DC Converter

Analog Devices 

a

Micropower Low Cost

Fixed 3.3 V, 5 V, 12 V and Adjustable

DC-to-DC Converter

FEATURES

Operates at Supply Voltages 2 V to 12 V

Fixed 3.3 V, 5 V, 12 V and Adjustable Output

Minimum External Components Required

Ground Current: 320 ␮A

Oscillator Frequency: 120 kHz

Logic Shutdown

8-Lead DIP and SO-8 Packages

APPLICATIONS

Cellular Telephones

Single-Cell to 5 V Converters

Laptop and Palmtop Computers

Pagers

Cameras

Battery Backup Supplies

Portable Instruments

Laser Diode Drivers

Hand-Held Inventory Computers

GENERAL DESCRIPTION

The ADP1109 is a versatile step-up switching regulator. The

device requires only minimal external components to operate as

a complete switching regulator.

The ADP1109-5 can deliver 100 mA at 5 V from a 3 V input

and the ADP1109-12 can deliver 60 mA at 12 V from a 5 V

input. The device also features a logic controlled shutdown

capability that, when a logic low is applied, will shut down the

oscillator.

The 120 kHz operating frequency allows for the use of small

surface mount components. The gated oscillator capability

eliminates the need for frequency compensation.

ADP1109

FUNCTIONAL BLOCK DIAGRAMS

VIN

SENSE

1.25V

REFERENCE

R2

250k⍀

ADP1109-3.3: R1 = 152k⍀

ADP1109-5: R1 = 83k⍀

ADP1109-12: R1 = 29k⍀

COMPARATOR

SW

+

A1

120kHz

OSCILLATOR

Q1

DRIVER

R1

GND

SHUTDOWN

Fixed Output

VIN

FB

1.25V

REFERENCE

COMPARATOR

+

A1

ADP1109

SW

120kHz

OSCILLATOR

Q1

DRIVER

GND

SHUTDOWN

Adjustable Output

TYPICAL APPLICATION

L1

33␮H

D1

VIN

5V

VIN

SW

SENSE

ADP1109-12

SHUTDOWN

GND

SHUTDOWN/PROGRAM

+ C1

22␮F

16V

VOUT

12V

60mA

Flash Memory VPP Generator

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.

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., 1998

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