MIC4574YN

更新时间： 2024-11-30 10:56:59

品牌	Logo	应用领域
麦瑞 - MICREL		稳压器
页数	文件大小	规格书
7页	458K
描述
200kHz Simple 0.5A Buck Regulator

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MIC4574YN 数据手册

MIC4574

Micrel, Inc.

MIC4574

200kHz Simple 0.5A Buck Regulator

General Description

Features

The MIC4574 is a series of easy to use fixed and adjustable

BiCMOS step-down (buck) switch-mode voltage regulators.

The 200kHz MIC4574 duplicates the pinout and function of

the 52kHz LM2574. 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 0.5A 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% typ.)

• Standard inductors and capacitors are

25% of typical LM2574 values

The MIC4574 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 0.5A 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%.

• Thermal shutdown

In shutdown mode, the regulator draws less than 200µA

standby current. The regulator performs cycle-by-cycle cur-

rent limiting and thermal shutdown for protection under fault

conditions.

• 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

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.

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

• Isolated flyback converter using minimum external

components

The MIC4574 is available in the DIP (N) package and is rated

over the industrial temperature range.

• Negative boost converter

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Typical Application

100µH

5.0V/0.5A

Shutdown

Enable

SHDN

MIC4574-5.0BN

V_INFB

SGND PGND

8V to 24V

220µF

16V

47µF

35V

1N5819

Fixed Regulator

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

M9999-062105

June 2005

12 3 4 5 6 7

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与MIC4574YN相关器件

型号	品牌	获取价格	描述	数据表
MIC4575	MICREL	获取价格	200kHz Simple 1A Buck Voltage Regulator
MIC4575	MICROCHIP	获取价格	The MIC4575 is a series of easy to use fixed and adjustable BiCMOS step-down (buck) swit
MIC4575_09	MICREL	获取价格	200kHz Simple 1A Buck Regulator
MIC4575-3.3BT	MICREL	获取价格	200kHz Simple 1A Buck Voltage Regulator
MIC4575-3.3BU	MICREL	获取价格	200kHz Simple 1A Buck Voltage Regulator
MIC4575-3.3BUT&R	MICROCHIP	获取价格	Switching Regulator, Voltage-mode, 3.2A, 220kHz Switching Freq-Max, BICMOS, PSSO5, TO-263,
MIC4575-3.3WT	MICREL	获取价格	200kHz Simple 1A Buck Regulator
MIC4575-3.3WU	MICREL	获取价格	200kHz Simple 1A Buck Regulator
MIC4575-3.3WUTR	MICROCHIP	获取价格	3.2A SWITCHING REGULATOR, 220kHz SWITCHING FREQ-MAX, PSSO5, ROHS COMPLIANT, TO-263, 5 PIN
MIC4575-5.0BT	MICREL	获取价格	200kHz Simple 1A Buck Voltage Regulator

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