AT1368

1-Channel Synchronous Buck PWM Controller

with Power Good Reset

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

Tel: 886-3-563-0878

Fax: 886-3-563-0879

1

Features

• High efficiency (min. 90% On IO=300mA

~600mA)

• Using external P and N channel MOSFET

• Supports for down and up/down Zeta

conversion

• Maximum Duty 100%

• Oscillation frequency 300KHz or 600KHz

• Soft Start by an external capacity

• Output voltage accuracy

±2%

• Built-in ON/OFF Function

• Built-in Short-circuit Protection

• Stand-by current max. 10

µA

• Quiescent Current 1mA

• Monitor the input voltage and 3V3 output

• Input voltage: 2.5V ~7.0V

Applications

• Slim-Type CD-ROM/DVD-ROM/CD-RW

• Power Supply for portable devices

• Main or Sub Power source foe notebook

computers and peripherals.

General Description

The AT1368 provides complete control and

protection for a DC/DC converter optimized for

high-performance microprocessor applications. It

is designed to drive one P-Channel and one N-

Channel MOSFETs in a synchronous-rectified

buck topology. The AT1368 integrates all of the

control,

output

adjustment,

monitoring

and

protection functions into a single package. The

output voltage of the converter can be precisely

regulated with a maximum tolerance of

±2% over

temperature and line voltage variations. The

AT1368 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