AIC1631

2-Cell, 500mA, Step-Up DC/DC Converter

Analog Integrations Corporation

4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC

www.analog.com.tw

DS-1631-04 Dec 27, 00

TEL: 886-3-5772500

FAX: 886-3-5772510

1

FEATURES

High Efficiency 90%.

Adjustable Output Voltage with Two Resistors

(AIC1631A)

Power-Saving Shutdown Mode (7

µA typical).

Internal 2A Switch.

120KHz Switching Rate.

Adjustable Switch Current Limit.

On-Chip Low Battery Detector.

APPLICATIONS

Palmtop & Notebook Computers.

Pocket Organizers.

Cameras.

Pagers.

Battery Backup Supplies.

Portable Instruments.

DESCRIPTION

The AIC1631 is a high efficiency step up DC-

DC converter. Only four external components

are required to deliver a fixed voltage of 3V,

3.3V, or 5V. The output voltage can be exter-

nally set to an arbitrary value below breakdown

voltage of the power switch for AIC1631A. Effi-

ciency beyond 87% can be easily achieved at

100mA load with 2.2V to 3V input voltages.

Logic-controlled shutdown mode is provided for

power saving. Switch current limit can be pro-

grammed with a resistor. The low battery de-

tector can be configured as a linear regulator or

a burst mode controller performing an extremely

low supply current operation.

120KHz switching rate reduces the inductor size.

Inductors of 25

µH to 50µH inductance are re-

commended for most applications.

TYPICAL APPLICATION CIRCUIT

AIC1631

LOAD

100

µF

NORMAL

R

ILIM

SD

ILIM/SD

VOUT

VIN

LBI

SW

LBO

SGND

CGND

+V

IN

1N5819

D1

+

+

C1

R1

L

C2

100

µF

50

µH

100

Ω

+V

OUT

(3.3V)

Note: V

IN

High Efficiency Step-Up DC/DC Converter