AIC1630

2-Cell, Step-Up DC/DC Converter Controller

Analog Integrations Corporation

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

www.analog.com.tw

DS-1630-05

TEL: 886-3-5772500

FAX: 886-3-5772510

1

FEATURES

Adjustable Output Voltage with Two Resistors

(AIC1630A).

Power-Saving Shutdown Mode (7

µA typical).

120KHz Switching Rate.

On-Chip Low Battery Detector.

APPLICATIONS

Palmtop & Notebook Computers.

Battery Charger Supply.

Cellular Telephone.

LCD Contrast Supply.

Flash Memory Programmer.

Battery Backup Supplies.

Portable Instruments.

DESCRIPTION

The AIC1630 is a DC-DC converter designed to

drive an external power switch for more flexibility,

especially in higher voltage and larger power

applications.

Typically six

components

are

required to set up a step up configuration easily

achieving efficiency beyond 80%. A few more

components are required to set up a step down

configuration delivering 4A load current with 83%

typical efficiency, 86% at 2A load, and 300

µA

quiescent current.

The output voltage is internally set to 3V, 3.3V, 5V

or externally set to an arbitrary value below

breakdown voltage of the power switch. Logic-

controlled shutdown mode is provided for power

saving. The low battery detector can be also

configured as a linear regulator.

120KHz switching rate reduces the inductor size.

Inductors of 25

µH to 50µH inductance are

recommended for most applications.

TYPICAL APPLICATION CIRCUIT

D1

1N5819

3.3V

C1

100

Ω

R3

5nF C2

270

Ω

R4

LOAD

Q1

1

AIC1630

SD

VIN

EXT

SGND

VOUT

LBI

LBO

CGND

L

+

High Efficiency Step-Up DC/DC Converter