MIC4576BUTR Micrel Semiconductor, MIC4576BUTR Datasheet

MIC4576BUTR

Manufacturer Part Number

MIC4576BUTR

Description

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC4576-3.3BUTR.pdf (8 pages)

Specifications of MIC4576BUTR

Date_code

03+

Packing_info

TO-263-05L

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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 ver-

sions 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 con-

ditions. The oscillator frequency is guaranteed to ±10%.

In shutdown mode, the regulator draws less than 200µA

standby current.

current limiting and thermal shutdown for protection under

fault conditions.

This series of simple switch-mode regulators requires a mini-

mum 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.

Typical Applications

March 2006

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

The regulator performs cycle-by-cycle

16V to 36V

Shutdown

Enable

470µF

63V

8V to 36V

Shutdown

Enable

470µF

63V

SHDN

MIC4576WT

SHDN

MIC4576-5.0WT

GND

Adjustable Regulator

GND

Fixed Regulator

Features

• Fixed 200kHz operation

• 3.3V, 5V, and adjustable output versions

• Voltage over speciﬁed line and load conditions:

• 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

MBR360

Fixed version: ±3% max. output voltage

Adjustable version: ±2% max. feedback voltage

68µH

MBR360

200kHz Simple 3A Buck Regulator

33µH

13.0k

1.50k

5V/3A

1000µF

16V

12V/3A

MIC4576

1000µF

16V

MIC4576

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