LM2574

更新时间： 2024-10-26 22:51:55

品牌	Logo	应用领域
麦瑞 - MICREL		稳压器
页数	文件大小	规格书
8页	43K
描述
52KHZ SIMPLE 0.5A BUCK REGULATOR

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LM2574 数据手册

LM2574

Micrel

LM2574

52kHz Simple 0.5A Buck Regulator

General Description

Features

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

adjustable switching voltage regulators. The LM2574 con-

tains all of the active circuitry necessary to construct a

stepdown(buck)switchingregulatorandrequiresaminimum

of external 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

TheLM2574isavailablein3.3Vand5Vfixedoutputversions,

oranadjustableversionwithanoutputvoltagerangeof1.23V

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

input and load conditions.

TheLM2574cansupply0.5Awhilemaintainingexcellentline

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

highefficiency. Adequateheattransferisusuallyprovidedby

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.

Ordering Information

Part Number

LM2574BN

Junction Temp. Range

–40°C to +85°C

Package

8-pin Plastic DIP

Circuits constructed around the LM2574 use a standard

series of inductors which are available from several different

manufacturers.

LM2574-3.3BN

LM2574-5.0BN

–40°C to +85°C

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

0.5A

C_IN

22µF

330µH

LM2574

OUT

PWR

SIG ON/

GND GND OFF

C_OUT

220µF

11DQ05

Figure 1. Fixed Output Regulator Circuit

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

M9999-122303

December 2003

12 3 4 5 6 7 8

中文翻译

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与LM2574相关器件

型号	品牌	获取价格	描述	数据表
LM2574/D	ETC	获取价格	Easy Switcher? 0.5A Step-Down Voltage Regulator
LM2574_05	MICREL	获取价格	52kHz Simple 0.5A Buck Regulator
LM2574_06	ONSEMI	获取价格	0.5 A, Adjustable Output Voltage, Step−Down Switching Regulator
LM2574-12	MOTOROLA	获取价格	EASY SWITCHERE⑩ 0.5 A STEP-DOWN VOLTAGE REGUL
LM2574-12BN	MICREL	获取价格	52kHz Simple 0.5A Buck Regulator
LM2574-12BWM	MICREL	获取价格	52kHz Simple 0.5A Buck Regulator
LM2574-12BWMT&R	MICROCHIP	获取价格	Switching Regulator, Voltage-mode, 1.8A, 63kHz Switching Freq-Max, PDSO14, 0.300 INCH, SOI
LM2574-12MDC	NSC	获取价格	IC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or
LM2574-12MWC	NSC	获取价格	IC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator o
LM2574-15	MOTOROLA	获取价格	EASY SWITCHERE⑩ 0.5 A STEP-DOWN VOLTAGE REGUL

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