LM2574YN

更新时间： 2024-11-09 11:34:03

品牌	Logo	应用领域
麦瑞 - MICREL		稳压器
页数	文件大小	规格书
8页	190K
描述
52kHz Simple 0.5A Buck Regulator

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LM2574YN 数据手册

LM2574

Micrel, Inc.

LM2574

52kHz Simple 0.5A Buck Regulator

General Description

Features

The LM2574 family is a series of easy to use ﬁxed and ad-

justable switching voltage regulators. The LM2574 contains

all of the active circuitry necessary to construct a stepdown

(buck)switchingregulatorandrequiresaminimumofexternal

components.

• 3.3V, 5V, 12V, and adjustable output versions

• Adjustable version output 1.23V to 37V ±4% max. over

line and load conditions.

• Guaranteed 0.5A output current

• Wide input voltage, up to 40V

• Thermal shutdown and current limit protection

• Requires only 4 external components.

• Shutdown capability (standby mode)

• Low power standby mode < 200µA Typical

• High-efﬁciency

The LM2574 is available in 3.3V and 5V ﬁxed output ver-

sions, or an adjustable version with an output voltage range

of 1.23V to 37V. Output voltage is guaranteed to ±4% for

speciﬁed input and load conditions.

The LM2574 can supply 0.5A while maintaining excellent

line and load regulation. The output switch includes cycle-

by-cycle current limiting, as well as thermal shutdown for full

protection under fault conditions.

• 52kHz ﬁxed frequency internal oscillator

• Uses standard inductors

Applications

Anexternalshutdownconnectionselectsoperatingorstandby

modes. Standby current is less than 200µA.

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

• Efﬁcient pre-regulator for linear regulators

• On-card switching regulators

Heat sinks are generally unnecessary due the regulator’s

high efﬁciency. Adequate heat transfer is usually provided

by soldering all package pins to a printed circuit board.

• Positive to negative converter (buck-boost)

The LM2574 includes internal frequency compensation and

an internal 52kHz ﬁxed frequency oscillator guaranteed to

±10% of the frequency.

Circuits constructed around the LM2574 use a standard

series of inductors which are available from several different

manufacturers.

All support documentation can be found on Micrel’s web site

at www.micrel.com.

Typical Application

40V MAX

UNREGULATED

DC IN

V_IN

REGULATED

OUTPUT

22µF

330µH

0.5A

LM2574

OUT

PWR SIG ON/

GND GND OFF

C_OUT

11DQ05

220µF

Figure 1. Fixed Output Regulator Circuit

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

July 2005

M9999-072805

12 3 4 5 6 7 8

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与LM2574YN相关器件

型号	品牌	获取价格	描述	数据表
LM2575	FCI	获取价格	1.0A Step - Down Voltage Switching Regulators 1A output current
LM2575	NSC	获取价格	SIMPLE SWITCHER® 1A Step-Down Voltage Regulator
LM2575	TI	获取价格	1-A SIMPLE STEP DOWN SWITCHING VOLTAGE REGULATOR
LM2575	MICREL	获取价格	52kHz Simple 1A Buck Regulator
LM2575	MOTOROLA	获取价格	EASY SWITCHERE™ 1.0 A STEP-DOWN VOLTAGE REGUL
LM2575	SEMTECH	获取价格	1A & 3A Miniconverter Switching Regulators
LM2575	ONSEMI	获取价格	1.0 A, Adjustable Output Voltage, Step−Down Switching Regulator
LM2575	HTC	获取价格	1A, 52kHz, Step-Down Switching Regulator
LM2575	HN	获取价格	1A 开关型、直流-直流降压转换电路.稳压压差要求3V,转换效率: 77-88% 应用:
LM2575	MICROCHIP	获取价格	The LM2575 series of monolithic integrated circuits provide all the active functions for

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