AIC1652

MICROPOWER INVERTING DC/DC CONVERTER

SPEC NO: DS-1652-02 DEC 27, 00

ANALOG INTEGRATIONS CORPORATION

www.analog.com.tw

4F, 9 Industry E. 9th Road, Science-based IndustrialPark , Hsinchu, Taiwan, R.O.C.

TEL: (8863)577-2500 FAX:(8863)577-2510

1

l

2.4V to 7V Input Voltage Operation.

l

Adjustable Output Voltage up to -40V.

l

Low Quiescent Current at 80

µA.

l

Pulse Frequency Modulation Maintains High

Efficiency (87%).

l

70KHz to 160KHz Switching Frequency.

l

Power-Saving Shutdown Mode (0.7

µA Typical).

l

High Efficiency with Low Cost External PNP

Bipolar Transistor.

l

Negative LCD Contrast Bias for

1. Notebook & Palmtop Computers.

2. Pen-Based Data System.

3. Portable Data Collection Terminals.

4. Personal Digital Assistants.

l

Negative Voltage Supply.

The AIC1652 is a high performance inverting

DC/DC converter, designed to drive an external

power switch to generate programmable negative

voltages. In the particularly suitable LCD bias con-

trast

application,

efficiency

of

87%

can

be

achieved with low cost PNP bipolar transistor driv-

ers. Output voltage can be scaled to -40V or

greater by two external resistors. A pulse frequen-

cy modulation scheme is employed to maintain

high efficiency conversion under wide input voltage

range. Quiescent current is about 80

µA and can

be reduced to 0.7

µA in shutdown mode. Switching

frequency being around 70KHz to 160KHz range,

small size switching components are ideal for bat-

tery powered portable equipments, like notebook

and palmtop computers.

D1

1N5819

AIC1652

CL

DHI

DLOW

FB

GND

SHDN

VIN

VREF

C3

10nF

C4

0.047µF

150µH

*L

Q1

9012

RB

470~1.8K

R1

1M

C2

C1

2.4V ~ 7V

-12V~ -40V

-10mA

100µF

*

Sumida CD-54 Series

100µF

+

+

R2

100K

Negative LCD Contrast Bias Power Supply

PACKAGE TYPE

N: PLASTIC DIP

S: SMALL OUTLINE

TEMPERATURE RANGE

C=0

°C~+70°C

ORDER NUMBER

AIC1652CN

(PLASTIC DIP)

PIN CONFIGURATION

AIC1652CS

(PLASTIC SO)

TOP VIEW

DLOW

1

3

4

2

8

6

5

7

CL

VREF

SHDN

FB

DHI

GND

VIN

AIC1652 XX