General Description

The TD1501 is a series of easy to use fixed and

adjustable step-down (buck) switch-mode voltage

regulators. These devices are available in fixed output

voltage of 3.3V, 5V, and an adjustable output version.

Both versions are capable of driving a 3A load with

excellent line and load regulation.

Requiring a minimum number of external components,

these regulators are simple to use and include internal

frequency compensation, and a fixed-frequency

oscillator.

The output voltage is guaranteed to ±3 tolerance under

specified input voltage and output load conditions. The

oscillator frequency is guaranteed to ±15. External

shutdown is included, featuring typically 80 μA standby

current. Self protection features include a two stage

frequency reducing current limit for the output switch and

an over temperature shutdown for complete protection

under fault conditions.

The TD1501 is available in TO-220B-5L TO220-5L and

TO-263-5L packages.

特性 Features

3.3V, 5V and adjustable output versions

Output adjustable from 1.23v to 43V

Fixed 150KHz frequency internal oscillator

Guaranteed 3A output load current

Input voltage range up to 45V

Low power standby mode, IQ typically 80 μA

TTL shutdown capability

Excellent line and load regulation

Requires only 4 external components

High efficiency

Thermal shutdown and current limit protection

Available in TO-220B/TO220 and TO-263 packages

Applications

Simple High-efficiency step-down regulator

On-card switching regulators

Positive to negative converter

LCD monitor and LCD TV

DVD recorder and PDP TV

Battery charger

Step-down to 3.3V for microprocessors