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AT1391

Preliminary Product Information

1-Channel Step-Down PWM Controller

General Description

The AT1391 provides complete control and

protection for a DC/DC converter optimized for

high-performance microprocessor applications. It

is designed to drive one P-Channel in a buck

topology. The AT1391 integrates all of the control,

output adjustment, and protection functions into a

single package. The output voltage of the converter

can be precisely regulated with a maximum

tolerance of

鹵2%

over temperature and line voltage

variations. The AT1391 is a family of low-noise

step-down DC/DC converters that is ideally suited

for systems powered from a 1-cell Li-ion battery or

from a 3-cell to 4-cell NiCd, NiMH, or alkaline

battery. It can also be used to USB-Based power

system.

Features

鈥?High efficiency

鈥?Using external P channel MOSFET

鈥?Maximum Duty 100%

鈥?Oscillation frequency 600KHz

鈥?Soft Start by an external capacity

鈥?Output voltage accuracy

鹵2%

鈥?Built-in ON/OFF Function

鈥?Built-in Short-circuit Protection

鈥?Stand-by current max. 10碌A(chǔ)

鈥?Quiescent Current 1mA

鈥?Input voltage: 2.5V ~7.0V

Applications

鈥?Power Supply for portable devices

Block Diagram

Aimtron reserves the right without notice to change this circuitry and specifications.

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

WWW:

http://www.aimtron.com.tw

Fax: 886-3-563-0879

Email:

service@aimtron.com.tw

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