MIC4575WU

MICREL SEMICONDUCTOR MIC4575WU DC-DC Switching Buck Step Down Regulator, Adjustable, 4V-24Vin, 1.23V-20Vout, 1Aout, TO-263-5

General Description

The MIC4575 is a series of easy to use fixed and adjustable BiCMOS step-down buck switch-mode voltage regulators. The 200kHz MIC4575 duplicates the pinout and function of the 52kHz LM2575. The higher switching frequency may allow up to a 2:1 reduction in output filter inductor size.

The MIC4575 is available in 3.3V, and 5V fixed output versions or a 1.23V to 20V adjustable output version. Both versions are capable of driving a 1A load with excellent line and load regulation.

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 1A switch current

• Wide 4V to 24V input voltage range

• Wide 1.23V to 20V output voltage range

• Requires minimum external components

• < 200µA typical shutdown mode

• 75% efficiency adjustable version > 75% typical

• Standard inductors and capacitors are25% of typical LM2575 values

• Thermal shutdown

• Overcurrent protection

• 100% electrical thermal limit burn-in

Applications

• Simple high-efficiency step-down buck regulator

• Efficient pre-regulator for linear regulators

• On-card switching regulators

• Positive-to-negative converter inverting buck-boost

• Battery charger

• Negative boost converter

• Step-down 6V to 3.3V for Intel Pentium® and similar microprocessors

____________________________________________________