LM2597

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SIMPLE SWITCHER 电源转换器 150 kHz 0.5A 降压电压稳压器

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数据表

document-pdfAcrobat LM2597, LM2597HV SIMPLE SWITCHER® Power Converter 150-kHz 0.5-A Step-Down Voltage Regulator With Features 数据表 (Rev. D) (英语) PDF | HTML

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LM2597

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产品详情

Rating

Catalog

Topology

Buck

Iout (max) (A)

0.5

Vin (max) (V)

40

Vin (min) (V)

4.5

Vout (max) (V)

37

Vout (min) (V)

3.3

Features

Overcurrent protection, Power good

Control mode

Voltage mode

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.005

Duty cycle (max) (%)

100

Rating

Catalog

Topology

Buck

Iout (max) (A)

0.5

Vin (max) (V)

40

Vin (min) (V)

4.5

Vout (max) (V)

37

Vout (min) (V)

3.3

Features

Overcurrent protection, Power good

Control mode

Voltage mode

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.005

Duty cycle (max) (%)

100

SOIC (D)

8

29.4 mm² (4.9 mm × 6 mm)

PDIP (P)

8

92.5083 mm² (9.81 mm × 9.43 mm)

3.3-V, 5-V, 12-V, and Adjustable Output Versions
Adjustable Version Output Voltage Range: 1.2 V
to 37 V (57 V for HV Version) ±4% Maximum Over
Line and Load Conditions
Specified 0.5-A Output Current
Available in 8-Pin Surface-Mount and 8-Pin PDIP
Packages
Input Voltage Range Up to 60 V
150-kHz Fixed-Frequency Internal Oscillator
Shutdown/Soft-Start
Out of Regulation Error Flag
Error Output Delay
Bias Supply Pin (V_BS) for Internal Circuitry
Improves Efficiency at High Input Voltages
Low Power Standby Mode, I_Q, Typically 85 µA
High Efficiency
Uses Readily Available Standard Inductors
Thermal Shutdown and Current-Limit Protection

3.3-V, 5-V, 12-V, and Adjustable Output Versions
Adjustable Version Output Voltage Range: 1.2 V
to 37 V (57 V for HV Version) ±4% Maximum Over
Line and Load Conditions
Specified 0.5-A Output Current
Available in 8-Pin Surface-Mount and 8-Pin PDIP
Packages
Input Voltage Range Up to 60 V
150-kHz Fixed-Frequency Internal Oscillator
Shutdown/Soft-Start
Out of Regulation Error Flag
Error Output Delay
Bias Supply Pin (V_BS) for Internal Circuitry
Improves Efficiency at High Input Voltages
Low Power Standby Mode, I_Q, Typically 85 µA
High Efficiency
Uses Readily Available Standard Inductors
Thermal Shutdown and Current-Limit Protection

The LM2597xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version, and are packaged in an 8-pin PDIP and an 8-pin surface-mount package.

This series of switching regulators is similar to the LM2594 series, with additional supervisory and performance features added.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, improved line and load specifications, fixed-frequency oscillator, Shutdown/Soft-start, error flag delay, and error flag output.

The LM2597xx series operates at a switching frequency of 150-kHz, thus allowing smaller-sized filter components than what would be required with lower-frequency switching regulators. Because of its high efficiency, the copper traces on the printed-circuit board are normally the only heat sinking required.

A standard series of inductors (both through-hole and surface-mount types) are available from several different manufacturers optimized for use with the LM2597xx series. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a specified ±4% tolerance on output voltage under all conditions of input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 85-µA standby current. Self protection features include a two stage current limit for the output switch and an overtemperature shutdown for complete protection under fault conditions.

The LM2597HV is for use in applications requiring and input voltage up to 60 V.

The LM2597xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version, and are packaged in an 8-pin PDIP and an 8-pin surface-mount package.

This series of switching regulators is similar to the LM2594 series, with additional supervisory and performance features added.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, improved line and load specifications, fixed-frequency oscillator, Shutdown/Soft-start, error flag delay, and error flag output.

The LM2597xx series operates at a switching frequency of 150-kHz, thus allowing smaller-sized filter components than what would be required with lower-frequency switching regulators. Because of its high efficiency, the copper traces on the printed-circuit board are normally the only heat sinking required.

A standard series of inductors (both through-hole and surface-mount types) are available from several different manufacturers optimized for use with the LM2597xx series. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a specified ±4% tolerance on output voltage under all conditions of input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 85-µA standby current. Self protection features include a two stage current limit for the output switch and an overtemperature shutdown for complete protection under fault conditions.

The LM2597HV is for use in applications requiring and input voltage up to 60 V.

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顶层文档	类型	标题	格式选项	下载最新的英语版本		日期
*	数据表	LM2597, LM2597HV SIMPLE SWITCHER® Power Converter 150-kHz 0.5-A Step-Down Voltage Regulator With Features 数据表 (Rev. D)	PDF \| HTML			2016-5-31
	应用手册	半导体和 IC 封装热指标 (Rev. D)	PDF \| HTML	英语版 (Rev.D)	PDF \| HTML	2024-4-24
	技术文章	How to increase system reliability and simplify design using DC/DC converters	PDF \| HTML			2016-6-13
	技术文章	The importance of accurate switching frequency and current limit when selecting bu	PDF \| HTML			2016-4-19
	技术文章	Advantages of leaded packages in robust industrial designs	PDF \| HTML			2016-3-8
	应用手册	Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A)				2014-9-12
	应用手册	AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C)				2013-4-24
	应用手册	AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A)				2013-4-23
	应用手册	AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)				2013-4-23
	应用手册	AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C)				2013-4-23
	应用手册	AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C)				2013-4-23
	应用手册	AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)				2013-4-23
	应用手册	AN-1081 Low-Cost Low-Parts-Count DC/DC Converter With Multiple Outputs (Rev. B)				2013-4-23
	应用手册	AN-1197 Selecting Inductors for Buck Converters (Rev. B)				2013-4-23
	应用手册	AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C)				2013-4-23
	应用手册	AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B)				2013-4-23
	应用手册	Simple Techniques Minimize Cross-Coupling in Distributed Power Systems				2007-3-21
	应用手册	Input and Output Capacitor Selection				2005-9-19
	更多文献资料	SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations				2005-7-12
	应用手册	AN-643 EMI/RFI Board Design (Rev. B)				2004-5-3