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General Description

The TD1539 is a 380 KHz fixed frequency monolithic

step down switch mode regulator with a built in internal

Power MOSFET. It achieves 3A continuous output

current over a wide input supply range with excellent

load and line regulation.

The device includes a voltage reference, oscillation

circuit, error amplifier, internal PMOS and etc.

The PWM control circuit is able to adjust the duty ratio

linearly from 0 to 100%. An enable function, an over

current protection function and a short circuit protection

function are built inside. An internal compensation block

is built in to minimize external component count.

The TD1539 serves as ideal power supply units for

portable devices.

Features

● 3A Constant Output Current

● 140m? RDSON Internal Power PMOSFET Switch

● Up to 95% Efficiency

● Fixed 380KHz Frequency

● Wide 1.0V to 23V Input Voltage Range

● Output Adjustable from 0.8V to 21V

● Built in Frequency Compensation

● Built in Thermal Shutdown Function

● Built in Current Limit Function

● SOP-8 Package is Available

● The minimum dropout up to 0.3V

Applications

● Portable DVD

● LCD Monitor / TV

● Battery Charger

● ADSL Modem

● Telecom / Networking Equipment