MSP1250 Datasheet, PDF (1/9 Pages) List of Unclassifed Manufacturers – Power Converter 150kHz 3A Step-down Voltage Regulator

MSP1250
Power Converter 150kHz 3A
Step-down Voltage Regulator
General Description
The MSP1250 series of regulators are monolithic integrated circuits that provide all the
active functions for a step-down (buck) switching regulator, capable of driving a 3A load
with excellent line and load regulation. These devices are avail-able in fixed output voltages
of 3.3V, 5V, 12V, and an adjust-able output version.
Requiring a minimum number of external components, these regulators are simple to use
and include internal frequency compensation†, and a fixed-frequency oscillator.
The MSP1250 series operates at a switching frequency of 150 kHz thus allowing smaller
sized filter components than what would be needed with lower frequency switching
regulators. Available in a standard 5-lead TO-220 package with several different lead bend
options, and a 5-lead TO-263 surface mount package. A standard series of inductors are
available from several different manufacturers optimized for use with the MSP1250 series.
This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage under specified input
voltage and output load conditions, and ±15% on the oscillator frequency. 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 tem
perature shutdown for complete protection under fault conditions.
Features
± 3.3V, 5V, 12V, and adjustable output versions
± Adjustable version output voltage range, 1.2V to 37V±4% max over line and load
conditions
± Available in TO-220 and TO-263 packages
± Guaranteed 3A output load current
± Input voltage range up to 40V
± Requires only 4 external components
± Excellent line and load regulation specifications
± 150 kHz fixed frequency internal oscillator
± TTL shutdown capability
± Low power standby mode, I_Q typically 80 µA
± High efficiency
± Uses readily available standard inductors
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Thermal shutdown and current limit protection
Applications
± Simple high-efficiency step-down (buck) regulator
± On-card switching regulators
± Positive to negative converter