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.

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