MIC4576

更新时间： 2024-10-01 12:10:31

品牌	Logo	应用领域
麦瑞 - MICREL		稳压器
页数	文件大小	规格书
7页	74K
描述
200kHz Simple 3A Buck Voltage Regulator

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MIC4576 数据手册

MIC4576

Micrel

MIC4576

200kHz Simple 3A Buck Voltage Regulator

General Description

Features

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.

• 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

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%.

• 75% efficiency (adjustable version > 75% typical)

• Standard inductors are 25% of typical LM2576 values

• Thermal shutdown

• Overcurrent protection

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.

• 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

This series of simple switch-mode regulators requires a

minimum number of external components and can operate

using a standard series of inductors. Frequency compensa-

tion is provided internally.

The MIC4576 is available in TO-220 (T) and TO-263 (U)

packages for the industrial temperature range.

• Step-down to 3.3V for Intel Pentium™

and similar microprocessors

Typical Applications

5V/3A

Shutdown

Enable

SHDN

MIC4576-5.0BT

V_INFB

33µH

8V to 36V

1000µF

16V

470µF

63V

GND

MBR360

Fixed Regulator

68µH

12V/3A

1000µF

16V

Shutdown

Enable

SHDN

MIC4576BT

13.0k

16V to 36V

V_IN

470µF

63V

GND

1.50k

MBR360

Adjustable Regulator

MIC4576

4-128

April 1998•

12 3 4 5 6 7

中文翻译

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与MIC4576相关器件

型号	品牌	获取价格	描述	数据表
MIC4576_06	MICREL	获取价格	200kHz Simple 3A Buck Regulator
MIC4576-3.3BT	MICREL	获取价格	200kHz Simple 3A Buck Voltage Regulator
MIC4576-3.3BT	MICROCHIP	获取价格	Switching Regulator, Voltage-mode, 8.5A, 220kHz Switching Freq-Max, BICMOS, PSFM5, TO-220,
MIC4576-3.3BU	MICROCHIP	获取价格	Switching Regulator, Voltage-mode, 8.5A, 220kHz Switching Freq-Max, BICMOS, PSSO5, TO-263,
MIC4576-3.3BU	MICREL	获取价格	200kHz Simple 3A Buck Voltage Regulator
MIC4576-3.3BUT&R	MICREL	获取价格	Switching Regulator, Voltage-mode, 8.5A, 220kHz Switching Freq-Max, BICMOS, PSSO5, TO-263,
MIC4576-3.3WT	MICREL	获取价格	200kHz Simple 3A Buck Regulator
MIC4576-3.3WU	MICREL	获取价格	200kHz Simple 3A Buck Regulator
MIC4576-3.3WUTR	MICROCHIP	获取价格	8.5A SWITCHING REGULATOR, 220kHz SWITCHING FREQ-MAX, PSSO5, ROHS COMPLIANT, TO-263, 5 PIN
MIC4576-3.3WU-TR	MICROCHIP	获取价格	8.5A SWITCHING REGULATOR, 220kHz SWITCHING FREQ-MAX, PSSO5

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