AIC1633

2-Cell, 200mA, 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-1633-03 Mar 15, 00

TEL: 886-3-5772500

FAX: 886-3-5772510

1

FEATURES

High Efficiency Up To 87%.

Adjustable Output Voltage with Two Resistors

(AIC1633A)

Power-Saving Shutdown Mode (7

µA typical).

Internal 0.8A Switch.

120KHz Switching Rate.

Adjustable Switch Current Limit.

On-Chip Low Battery Detector.

APPLICATIONS

Pocket Organizers.

Electronic Dictionaries.

Cameras.

Pagers.

Bar-Code Scanners.

LCD Displays.

Battery Backup Supplies.

Portable Instruments.

DESCRIPTION

The AIC1633 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 externally set to

an arbitrary value below breakdown voltage of

the power switch for AIC1633A. Efficiency

beyond 83% can be easily achieved at 70mA

load with 2.2V to 3V input voltages.

Logic-controlled shutdown mode is provided for

power saving. Switch current limit can be

programmed with a resistor. The low battery

detector 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 47

µH to 150µH inductance are

recommended for most applications.

TYPICAL APPLICATION CIRCUIT

AIC1633

100

µH

L

LOAD

22

µF

C1

22

µF

C2

TATAN

NORMAL

SD

ILIM/SD

VOUT

VIN

LBI

SW

LBO

SGND

CGND

1N5819

D1

+

+

470

Ω

R1

10K

High-Efficiency Step-Up DC/DC Converter