AIC1642

3-Pin One-Cell Step-Up DC/DC Converter

Analog Integrations Corporation

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

DS-1642-01 012102

TEL: 886-3-5772500

FAX: 886-3-5772510

www.analog.com.tw

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FEATURES

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A Guaranteed Start-Up from less than 0.9 V.

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High Efficiency.

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Low Quiescent Current.

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Less Number of External Components needed.

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Low Ripple and Low Noise.

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Fixed Output Voltage: 2.7V, 3.0V, 3.3V, and 5V.

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Space Saving Packages: SOT-89 and TO-92

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APPLICATIONS

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Pagers.

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Cameras.

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Wireless Microphones.

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Pocket Organizers.

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Battery Backup Suppliers.

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Portable Instruments.

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DESCRIPTION

The AIC1642 is a high efficiency step-up

DC/DC converter for applications using 1 to 4

battery cells. Only three external components

are required to deliver a fixed output voltage of

2.7V, 3.0V, 3.3V, or 5V. The AIC1642 starts up

from less than 0.9V input with 1mA load. Pulse

Frequency Modulation scheme brings optimized

performance for applications with light output

loading and low input voltages. The output rip-

ple and noise are lower compared with the cir-

cuits operating in PSM mode.

The PFM control circuit operating in 100KHz

(max.) switching rate results in smaller passive

components. The space saving SOT-89 and

TO-92 packages make the AIC1642 is an ideal

choice of DC/DC converter for space conscious

applications, like pagers, electronic cameras,

and wireless microphones.

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TYPICAL APPLICATION CIRCUIT

D1

GS SS12

VOUT

SW

GND

AIC1642-27

AIC1642-30

AIC1642-33

AIC1642-50

C2

22

µF

+

L1

100

µH

+

C1

47

µF

One Cell Step-Up DC/DC Converter