LM25574

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42V, 0.5A Step-Down Switching Regulator

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Data sheet

document-pdfAcrobat LM25574 42-V, 0.5-A Step-Down Switching Regulator datasheet (Rev. H) PDF | HTML

LM25574

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Data sheet

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Product details

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Topology

Buck

Type

Converter

Iout (max) (A)

0.5

Vin (min) (V)

6

Vin (max) (V)

42

Switching frequency (min) (kHz)

50

Switching frequency (max) (kHz)

1000

Features

Frequency synchronization, Over Current Protection

Control mode

current mode

Vout (min) (V)

1.23

Vout (max) (V)

40

Iq (typ) (µA)

1000

Duty cycle (max) (%)

95

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Topology

Buck

Type

Converter

Iout (max) (A)

0.5

Vin (min) (V)

6

Vin (max) (V)

42

Switching frequency (min) (kHz)

50

Switching frequency (max) (kHz)

1000

Features

Frequency synchronization, Over Current Protection

Control mode

current mode

Vout (min) (V)

1.23

Vout (max) (V)

40

Iq (typ) (µA)

1000

Duty cycle (max) (%)

95

TSSOP (PW)

16

32 mm² 5 x 6.4

Integrated 42-V, 750-mΩ N-Channel MOSFET
Ultra-Wide Input Voltage From 6 V to 42 V
Adjustable Output Voltage as Low as 1.225 V
1.5% Feedback Reference Accuracy
Operating Frequency Adjustable Between 50 kHz and 1 MHz With Single Resistor
Master or Slave Frequency Synchronization
Adjustable Soft-Start
Emulated Current Mode Control Architecture
Wide Bandwidth Error Amplifier
Built-In Protection
TSSOP-16 Package
Create a Custom Design Using the LM25574 With the WEBENCH^® Power Designer

Integrated 42-V, 750-mΩ N-Channel MOSFET
Ultra-Wide Input Voltage From 6 V to 42 V
Adjustable Output Voltage as Low as 1.225 V
1.5% Feedback Reference Accuracy
Operating Frequency Adjustable Between 50 kHz and 1 MHz With Single Resistor
Master or Slave Frequency Synchronization
Adjustable Soft-Start
Emulated Current Mode Control Architecture
Wide Bandwidth Error Amplifier
Built-In Protection
TSSOP-16 Package
Create a Custom Design Using the LM25574 With the WEBENCH^® Power Designer

The LM25574 is an easy to use buck regulator which allows design engineers to design and optimize a robust power supply using a minimum set of components. Operating with an input voltage range of 6 V to 42 V, the LM25574 delivers 0.5-A of continuous output current with an integrated 750-mΩ N-Channel MOSFET. The regulator utilizes an Emulated Current Mode architecture which provides inherent line regulation, tight load transient response, and ease of loop compensation without the usual limitation of low-duty cycles associated with current mode regulators. The operating frequency is adjustable from 50 kHz to 1-MHz to allow optimization of size and efficiency. To reduce EMI, a frequency synchronization pin allows multiple IC’s from the LM(2)557x family to self-synchronize or to synchronize to an external clock. The LM25574 guarantees robustness with cycle-by-cycle current limit, short-circuit protection, thermal shut-down, and remote shut-down. The device is available in a TSSOP-16 package. The LM25574 is supported by the full suite of WEBENCH^® On-Line design tools.

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	Type	Title		Date
*	Data sheet	LM25574 42-V, 0.5-A Step-Down Switching Regulator datasheet (Rev. H)	PDF \| HTML	23 Aug 2017
	Application note	Semiconductor and IC Package Thermal Metrics (Rev. D)	PDF \| HTML	25 Mar 2024
	White paper	Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A)		03 Jul 2018
	Selection guide	Power Management Guide 2018 (Rev. R)		25 Jun 2018
	Application note	Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A)		12 Sep 2014
	Application note	AN-1997 Error Amplifier Limitations in High-Performance Regulator Applications (Rev. A)		06 May 2013
	EVM User's guide	AN-1577 LM25574 Evaluation Board (Rev. B)		24 Apr 2013
	Application note	AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C)		24 Apr 2013
	Application note	AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C)		23 Apr 2013
	Application note	AN-1197 Selecting Inductors for Buck Converters (Rev. B)		23 Apr 2013
	Application note	AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C)		23 Apr 2013
	Application note	AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C)		23 Apr 2013
	Application note	AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B)		23 Apr 2013
	Application note	AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A)		23 Apr 2013
	Application note	AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)		23 Apr 2013
	Application note	AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)		23 Apr 2013
	Application note	Understanding and Applying Current-Mode Control Theory		19 Aug 2007
	Application note	Input and Output Capacitor Selection		19 Sep 2005
	More literature	SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations		12 Jul 2005
	Application note	AN-643 EMI/RFI Board Design (Rev. B)		03 May 2004