Datasheet > LM2574

LM2574

更新时间： 2024-11-24 14:54:11

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
8页	187K
描述
The LM2574 family is a series of easy to use fixed and adjustable switching voltage regulators

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LM2574 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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