ADVANCE INFORMATION

AIC1640

LOW VOLTAGE STEP-UP DC/DC CONVERTER

SPEC NO: DS-1640-P1

ANALOG INTEGRATIONS CORPORATION

www.analog.com.tw

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

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

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FEATURES

Guaranteed Start-Up from Below 0.9 V.

High Efficiency.

Low Quiescent Current.

Fixed or adjustable Output Voltage.

Logic Controlled Shutdown.

External Switch Driver available.

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APPLICATIONS

Pagers.

Cameras.

Wireless Microphones.

Pocket Organizers.

Battery Backup Suppliers.

Portable Instruments.

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DESCRIPTION

The AIC1640 is a high efficiency step-up DC/DC

converter for applications using 1 to 4 battery cells.

Only three external components are required to de-

liver a fixed output voltage of 3V, 3.3V, or 5V.

Pulse Frequency Modulation scheme brings opti-

mized performance for applications with light output

loading and low input voltage. The output ripple

and noise are lower compared with the circuit op-

erating in PSM mode. The AIC1640 starts up from

below 0.9V input to boost either 3V, 3.3V, or 5V

output with 1mA load.

Some useful features include external driver for

higher power level applications, shutdown mode for

saving the life of battery, and adjustable output ver-

sion. The PFM control circuit operates in 100KHz

(max.) switching rate, resulting in smaller passive

component size, which makes the AIC1640 an ide-

al choice of DC/DC converter for space conscious

applications.

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TYPICAL APPLICATION CIRCUIT

+

C1

22

µF

L1

88

µH

D1

SB02-03C

AIC1640

GND

CE

NC

SW

EXT

VDD

VOUT

3.3V

NC

NC

≧0.9V

R1

300

C1

10nF

Q1

2SD2150

+

C2

100

µF

L1

33

µH

D1

1N5819

VOUT

3.3V/100mA

AIC1640

GND

CE

NC

SW

EXT

VDD

NC

NC

≧0.9V

3.3V Output Step-Up DC/DC Converter

3.3V/100mA Step-Up DC/DC Converter