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General Description

The MIC4576 is a series of easy to use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 200kHz MIC4576 duplicates the pinout and function of the 52kHz LM2576. The higher switching frequency may allow up to a 2:1 reduction in output filter inductor size.

The MIC4576 is available in 3.3V, and 5V fixed output versions or a 1.23V to 33V adjustable output version. Both versions are capable of driving a 3A load with excellent line and load regulation.

The feedback voltage is guaranteed to ±2 tolerance for adjustable versions, and the output voltage is guaranteed to ±3 for fixed versions, within specified voltages and load conditions. The oscillator frequency is guaranteed to ±10.

In shutdown mode, the regulator draws less than 200μA standby current. The regulator performs cycle-by-cycle current limiting and thermal shutdown for protection under fault conditions.

This series of simple switch-mode regulators requires a minimum number of external components and can operate using a standard series of inductors. Frequency compensation is provided internally.

The MIC4576 is available in TO-220 (T) and TO-263 (U) packages for the industrial temperature range.

Features

? Fixed 200kHz operation

? 3.3V, 5V, and adjustable output versions

? Voltage over specified line and load conditions:

Fixed version: ±3 max. output voltage

Adjustable version: ±2 max. feedback voltage

? Guaranteed 3A switch current

? Wide 4V to 36V input voltage range

? Wide 1.23V to 33V output voltage range

? Requires minimum external components

? < 200μA typical shutdown mode

? 75 efficiency (adjustable version > 75 typical)

? Standard inductors are 25 of typical LM2576 values

? Thermal shutdown

? Overcurrent protection

? 100 electrical thermal limit burn-in

Applications

? Simple high-efficiency step-down (buck) regulator

? Efficient preregulator for linear regulators

? On-card switching regulators

? Positive-to-negative converter (inverting buck-boost)

? Battery Charger

? Negative boost converter

? Step-down to 3.3V for Intel Pentium?

and similar microprocessors