MSP1250

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 MSP1250 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 MSP1250 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 of MSP1250 greatly simplifies the design of switch-mode power supplies.

Other features of MSP1250  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 A standby current. Self-protection features of MSP1250 include a two stage frequency reducing current limit for the output switch and an over tem perature shutdown for complete protection under fault conditions.