AT1361

1MHz,1A Synchronous Buck Converter

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

Fax: 886-3-563-0879

1/11/2008

REV:1.0

1

Features

• High efficiency (95%) possible

• No Schottky Diode Required

• 1A Output Current at 5V input 3.3V output

• Oscillation frequency 1.0MHz

• Built-in ON/OFF Function

• Built-in Short Circuit Protection

• Low Dropout Operation: 100% Duty Cycle

• Stand-by current max. 1

µA

• Input voltage: 2.5V ~5.5V

Applications

• Power Supply for portable devices

General Description

The AT1361 provides complete control for a

DC/DC converter optimized for high-performance

microprocessor applications. It is operated on

current mode architecture for excellent line and

load transient response. 1MHz operation frequency

is allowing the use of small surface mount inductor

and capacitor. The internal synchronous switch

increases efficiency and eliminates the need for an

external Schottky diode. The AT1361 is a family

of low-noise synchronous 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.

Block Diagram

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