Datasheet > LM2574

LM2574

更新时间： 2024-11-20 02:58:35

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描述
LM2574/LM2574HV SIMPLE SWITCHERâ¢ 0.5A Step-Down Voltage Regulator

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LM2574 数据手册

LM2574, LM2574HV

www.ti.com

SNVS104C –JUNE 1999–REVISED APRIL 2013

LM2574/LM2574HV SIMPLE SWITCHER™ 0.5A Step-Down Voltage Regulator

Check for Samples: LM2574, LM2574HV

FEATURES

DESCRIPTION

The LM2574 series of regulators are monolithic

•

3.3V, 5V, 12V, 15V, and Adjustable Output

Versions

integrated circuits that provide all the active functions

for a step-down (buck) switching regulator, capable of

driving a 0.5A load with excellent line and load

regulation. These devices are available in fixed output

voltages of 3.3V, 5V, 12V, 15V, and an adjustable

output version.

•

Adjustable Version Output Voltage Range,

1.23V to 37V (57V for HV version) ±4% Max

Over Line and Load Conditions

•

Specified 0.5A Output Current

Wide Input Voltage Range, 40V, up to 60V for

HV Version

Requiring

minimum number of external

components, these regulators are simple to use and

include internal frequency compensation and a fixed-

frequency oscillator.

•

Requires Only 4 External Components

52 kHz Fixed Frequency Internal Oscillator

The LM2574 series offers

high-efficiency

TTL Shutdown Capability, Low Power Standby

Mode

replacement for popular three-terminal linear

regulators. Because of its high efficiency, the copper

traces on the printed circuit board are normally the

only heat sinking needed.

•

High Efficiency

Uses Readily Available Standard Inductors

Thermal Shutdown and Current Limit

Protection

A standard series of inductors optimized for use with

the LM2574 are available from several different

manufacturers. This feature greatly simplifies the

design of switch-mode power supplies.

APPLICATIONS

Other features include a specified ±4% tolerance on

output voltage within specified input voltages and

output load conditions, and ±10% on the oscillator

frequency. External shutdown is included, featuring

50 μA (typical) standby current. The output switch

includes cycle-by-cycle current limiting, as well as

thermal shutdown for full protection under fault

conditions.

•

Simple High-Efficiency Step-Down (Buck)

Regulator

•

Efficient Pre-Regulator for Linear Regulators

On-Card Switching Regulators

Positive to Negative Converter (Buck-Boost)

Typical Application (Fixed Output Voltage Versions)

Note: Pin numbers are for 8-pin PDIP package.

Figure 1.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

SIMPLE SWITCHER is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...35

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LM2574 替代型号

型号	品牌	替代类型	描述	数据表
LMZ34202	TI	功能相似	采用 QFN 封装的 4.5V 至 42V、2A 降压电源模块
LM2574HV	TI	功能相似	SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
LM43600	TI	功能相似	SIMPLE SWITCHER 3.5 V to 36 V 0.5 A Synchronous Step-Down Voltage Converter

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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