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Product details

Parameters

Vin (Min) (V) 6 Vin (Max) (V) 75 Vout (Min) (V) 1.23 Vout (Max) (V) 70 Iout (Max) (A) 3 Iq (Typ) (mA) 1 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 500 Features Enable, Frequency Synchronization, Over Current Protection, Tracking Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 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

  • LM5576-Q1 is an Automotive Grade Product that
    is AEC-Q100 grade 1 Qualified (−40°C
    to + 125°C Operating Junction Temperature) and
    AEC-Q100 Grade 0 Qualified (−40°C to + 150°C
    + 150°COperating Junction Temperature)
  • Integrated 75 V, 170 mΩ N-channel MOSFET
  • Ultra-Wide Input Voltage Range from 6 V to 75 V
  • Adjustable Output Voltage as Low as 1.225 V
  • 1.5% (Q1) and 1.65% (Q0) Feedback Reference
    Accuracy
  • Operating Frequency Adjustable Between 50 kHz
    and 500 kHz 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)
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Description

The LM5576 is an easy to use SIMPLE SWITCHER 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 - 75 V, the LM5576 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 500 kHz to allow optimization of size and efficiency. To reduce EMI, a frequency synchronization pin allows multiple ICs from the LM(2)557x family to self-synchronize or to synchronize to an external clock. The LM5576 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 LM5576 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 LM5576/-Q1 SIMPLE SWITCHER® 75 V, 3 A Step-Down Switching Regulator datasheet (Rev. J) Mar. 03, 2014
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
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application notes Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Application notes Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep. 12, 2014
Technical articles Why wide VIN ICs for a 12V or 24V rail? Oct. 29, 2013
Application notes AN-1997 Error Amplifier Limitations in High-Performance Regulator Applications (Rev. A) May 06, 2013
User guides AN-1570 LM5576 Evaluation Board (Rev. B) Apr. 26, 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
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.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$49.00
Description

The LM5576 evaluation board is designed to provide the design engineer with a fully functional power converter based on Emulated Current Mode Control to evaluate the LM5576 regulator IC. The evaluation board provides a 5V output with a 3A current capability. The ultra-wide input voltage ranges from (...)

Features
  • Integrated 75V, 170Wm N-Channel MOSFET
  • Ultra-wide input voltage range from 6V to 75V
  • Adjustable output voltage as low as 1.225V
  • 1.5% feedback reference accuracy
  • Operating frequency adjustable between 50kHz and 500kHz with single resistor
  • Master or slave frequency synchronization
  • Adjustable soft-start
  • (...)

Design tools & simulation

SIMULATION MODELS Download
SNVM292C.ZIP (1168 KB) - PSpice Model
SIMULATION MODELS Download
SNVM547A.TSC (661 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVM548A.TSC (566 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVM549A.ZIP (10 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SNVM935C.ZIP (5 KB) - PSpice Model
SIMULATION MODELS Download
SNVMBP5.TSC (565 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVMBP6.TSC (647 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVMBP7.TSC (677 KB) - TINA-TI Reference Design
CALCULATION TOOLS Download
CALCULATION TOOLS Download

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options

Ordering & quality

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