LM25576

ACTIVE

4.5V to 42V, 3A Step-Down DC/DC Switching Regulator

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Product details

Parameters

Vin (Min) (V) 6 Vin (Max) (V) 42 Vout (Min) (V) 1.23 Vout (Max) (V) 40 Iout (Max) (A) 3 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 1000 Features Frequency Synchronization, Over Current Protection Control mode Current Mode Duty cycle (Max) (%) 95 Type Converter Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 open-in-new Find other Buck converters (integrated switch)

Features

  • Integrated 42-V, 170-mΩ N-channel MOSFET
  • Ultra-Wide Input Voltage Range 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
  • HTSSOP-20EP (Exposed Pad)
  • Create a Custom Design Using the LM25576 With the WEBENCH® Power Designer

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Description

The LM25576 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 LM25576 delivers 3 A of continuous output current with an integrated 170-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 LM25576 ensures robustness with cycle-by-cycle current limit, short-circuit protection, thermal shut-down, and remote shut-down. The device is available in a power enhanced HTSSOP-20 package featuring an exposed die attach pad for thermal dissipation. The LM25576 is supported by the full suite of WEBENCH® On-Line design tools.

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Technical documentation

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Type Title Date
* Datasheet LM25576 42-V, 3-A Step-Down Switching Regulator datasheet (Rev. H) Aug. 28, 2017
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
White papers Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) Jul. 03, 2018
Technical articles Quantifying the value of wide VIN Jun. 15, 2016
Technical articles DC/DC converter datasheets – System losses demystified Apr. 25, 2016
Application notes Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Technical articles DC/DC converter datasheets – System efficiency demystified Apr. 18, 2016
Selection guides SIMPLE SWITCHER Overview Brochure (Rev. B) Mar. 18, 2016
Application notes Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep. 12, 2014
Selection guides Wide VIN DC/DC power solutions: industrial, automotive, and comms applications Jun. 06, 2014
Application notes AN-1997 Error Amplifier Limitations in High-Performance Regulator Applications (Rev. A) May 06, 2013
User guides AN-1579 LM25576 Evaluation Board (Rev. C) Apr. 24, 2013
Application notes AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
Application notes AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr. 23, 2013
Application notes AN-1197 Selecting Inductors for Buck Converters (Rev. B) Apr. 23, 2013
Application notes AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr. 23, 2013
Application notes AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) Apr. 23, 2013
Application notes AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) Apr. 23, 2013
Application notes AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr. 23, 2013
Application notes AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr. 23, 2013
Application notes AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
Application notes Quick Start Guide for a 3 Amp Buck Regulator Using the LM5576 and LM25576 (Rev. B) Apr. 23, 2013
User guides LM25576 Reference Design 6-42V input, 5V 3A output User Guide Jan. 27, 2012
More literature LM25576 Reference Design 6-42V input, 5V 3A output Files Jan. 25, 2012
Application notes Understanding and Applying Current-Mode Control Theory Aug. 19, 2007
Application notes Input and Output Capacitor Selection Sep. 19, 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul. 12, 2005
Application notes AN-643 EMI/RFI Board Design (Rev. B) May 03, 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SIMULATION MODELS Download
SNVM305.ZIP (57 KB) - PSpice Model
SIMULATION MODELS Download
SNVM306A.ZIP (123 KB) - PSpice Model
SIMULATION MODELS Download
SNVM871.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVM872A.ZIP (4 KB) - PSpice Model
CALCULATION TOOLS Download
CALCULATION TOOLS Download
CAD/CAE SYMBOLS Download
SNVC006.ZIP (647 KB)

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options

Ordering & quality

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