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LM5574

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75V, 0.5A Step-Down Switching Regulator

Data sheet
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75V, 0.5A Step-Down Switching Regulator

LM5574

ACTIVE
Data sheet Order now

Product details

Parameters

Vin (Min) (V) 6 Vin (Max) (V) 75 Vout (Min) (V) 1.23 Vout (Max) (V) 70 Iout (Max) (A) 0.5 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 500 Features Enable, Frequency Synchronization, Over Current Protection, Tracking 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

TSSOP (PW) 16 22 mm² 5 x 4.4 open-in-new Find other Buck converters (integrated switch)

Features

  • LM5574-Q1 is an Automotive Grade Product that is AEC-Q100 Grade 1 Qualified (−40°C to + 125°C Operating Junction Temperature)
  • Integrated 75V, 750mΩ 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
  • Emulated Current Mode Control Architecture
  • Wide Bandwidth Error Amplifier
  • Built-in Protection
  • Automotive Grade Product Datasheet that is AEC-Q100 Grade 0 Qualified is Available Upon Request
    • (−40°C to + 150°C Operating Junction Temperature)

Package

  • TSSOP-16

WEBENCH is a trademark of Texas Instruments. All trademarks are the property of their respective owners.

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Description

The LM5574 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 - 75V, the LM5574 delivers 0.5A of continuous output current with an integrated 750mΩ 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 50kHz to 500kHz 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 LM5574 ensures 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 LM5574 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 LM5574/LM5574Q SIMPLE SWITCHER® 75V, 0.5A Step-Down Switching Regulator datasheet (Rev. F) Apr. 04, 2013
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
Application notes Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Selection guides SIMPLE SWITCHER Overview Brochure (Rev. B) Mar. 18, 2016
Application notes Cap Drop Offline Supply for E-Meters Jun. 16, 2015
Application notes Cost-Effective Transformerless Offline Supply for Light Load Applications (Rev. A) Jun. 16, 2015
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-1568 LM5574 Evaluation Board (Rev. C) 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 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 LM5574 evaluation board is designed to provide the design engineer with a fully functional power converter based on Emulated Current Mode Control to evaluate the LM5574 regulator IC. The evaluation board provides a 5V output with a 0.5A current capability. The ultra-wide input voltage ranges (...)

Features
  • Integrated 75V, 750Wm 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
  • (...)
View details

Design tools & simulation

SIMULATION MODELS Download
SNVM310A.ZIP (115 KB) - PSpice Model
SIMULATION MODELS Download
SNVM311.ZIP (58 KB) - PSpice Model
SIMULATION MODELS Download
SNVM933.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVM934A.ZIP (4 KB) - PSpice Model
CALCULATION TOOLS Download
CALCULATION TOOLS Download

Reference designs

REFERENCE DESIGNS Download
Multi-Rail Power Reference Design for Eliminating EMI Effects in High Performance DAQ Systems
TIDA-01054 — The TIDA-01054 reference design helps eliminate the performance degrading effects of EMI on Data Acquisition (DAQ) systems greater than 16 bits with the help of the LM53635 buck converter. The buck converter enables the designer to place power solutions close to the signal path without the unwanted (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
ADC Voltage Reference Buffer Optimization Reference Design for High Performance DAQ Systems
TIDA-01055 — The TIDA-01055 reference design for high performance DAQ Systems optimizes the ADC reference buffer to improve SNR performance and reduce power consumption with the TI OPA837 high-speed op amp. This device is used in a composite buffer configuration and provides a 22% power improvement over (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Reference Design Maximizing Signal Dynamic Range for True 10 Vpp Differential Input to 20 bit ADC
TIDA-01057 — This reference design is designed for high performance data acquisition(DAQ) systems to improve the dynamic range of 20 bit differential input ADCs. Many DAQ systems require the measurement capability at a wide FSR (Full Scale Range) in order to obtain sufficient signal dynamic range. Many earlier (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
20-bit 1MSPS DAQ Reference Design Optimizing Power Supply Efficiency While Minimizing EMI
TIDA-01056 — This reference design for high performance data acquisition (DAQ) systems optimizes power stage in order to reduce power consumption and minimize the effect of EMI from switching regulator by using LMS3635-Q1 buck converter.  This reference designs yields 7.2% efficiency improvement at most (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Optimized Analog Front End DAQ System Reference Design for 18 bit SAR Data Converters
TIDA-01050 — The TIDA-01050 reference design aims to improve the integration, power consumption, performance, and clocking issues typically associated with automatic test equipment. This design is applicable to any ATE system but most applicable to systems requiring a large number of input channels.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
ADC Driver Reference Design Improving Full Scale THD Using Negative Supply
TIDA-01052 — The TIDA-01052 reference design aims to highlight system performance increases seen using a negative voltage rail on the analog front end driver amplifiers rather than ground. This concept is relative to all analog front ends, however this design is aimed specifically at automatic test equipment.
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 16 View options

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