LM22679

ACTIVE

SIMPLE SWITCHER® 4.5V to 42V, 5A Step-Down Voltage Regulator with Adjustable Soft-Start & Current Li

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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 1.285 Vout (Max) (V) 37 Iout (Max) (A) 5 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 500 Switching frequency (Max) (kHz) 500 Features Adjustable Current Limit, Over Current Protection Control mode Voltage Mode Duty cycle (Max) (%) 90 Type Converter Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

TO-263 (NDR) 7 100 mm² 10.16 x 9.85 open-in-new Find other Buck converters (integrated switch)

Features

  • Wide Input Voltage Range: 4.5 V to 42 V
  • Internally Compensated Voltage Mode Control
  • Stable With Low ESR Ceramic Capacitors
  • 100-mΩ N-Channel MOSFET
  • Output Voltage Options:
     -ADJ (Outputs as Low as 1.285 V)
     -5.0 (Output Fixed to 5 V)
  • ±1.5% Feedback Reference Accuracy
  • Switching Frequency of 500 kHz
  • –40°C to 125°C Operating Junction
    Temperature Range
  • Adjustable Soft-Start
  • Adjustable Current Limit
  • Integrated Boot-Strap Diode
  • Fully WEBENCH® Enabled
  • LM22679-Q1 is AEC-Q100 Qualified and
    Manufactured on an Automotive-Grade Flow
  • PFM (Exposed Pad) Package
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Description

The LM22679 switching regulator provides all of the functions necessary to implement an efficient high-voltage step-down (buck) regulator using a minimum of external components. This easy-to-use regulator incorporates a 42-V N-channel MOSFET switch that can provide up to 5 A of load current. Excellent line and load regulation along with high efficiency (> 90%) are featured. Voltage mode control offers short minimum on-time, allowing the widest ratio between input and output voltages. Internal loop compensation means that the user is free from the tedious task of calculating the loop compensation components. Fixed 5-V output and adjustable output voltage options are available. A switching frequency of 500 kHz allows for small external components and good transient response. An adjustable soft-start feature is provided through the selection of a single external capacitor. In addition, the switch-current limit can be programmed with a single external resistor, allowing solution optimization. The LM22679 device also has built-in thermal shutdown and current limiting to protect against accidental overloads.

SIMPLE SWITCHER® family. The SIMPLE SWITCHER concept provides for an easy to use complete design using a minimum number of external components and the TI WEBENCH design tool. TI’s WEBENCH tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in.

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Technical documentation

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Type Title Date
* Datasheet LM22679/-Q1 42-V, 5-A SIMPLE SWITCHER® Step-Down Voltage Regulator With Features datasheet (Rev. L) Nov. 04, 2014
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application notes Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Selection guides SIMPLE SWITCHER Overview Brochure (Rev. B) Mar. 18, 2016
Selection guides Analog for Xilinx (R) FPGAs Selection Guide - 2015 (Rev. B) Jan. 07, 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-1533 Overvoltage Protection Circuit for Automotive Load Dump (Rev. B) May 06, 2013
Application notes AN-1997 Error Amplifier Limitations in High-Performance Regulator Applications (Rev. A) May 06, 2013
Application notes AN-1797 TO-263 THIN Package (Rev. A) Apr. 24, 2013
User guides AN-1891 LM22679 Evaluation Board (Rev. E) 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 SIMPLE SWITCHER Regulators Take Over Automotive Applications (Rev. A) Apr. 23, 2013
Selection guides TI's Compact Power Solution for Avnet's Xilinx Kintex-7 FPGA Board Mar. 14, 2012
Selection guides Power Management for Altera FPGAs (Rev. E) Feb. 22, 2012
User guides SIMPLE SWITCHER® Design Guide Apr. 11, 2011
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

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
$25.00
Description

The LM22679 evaluation board is designed to demonstrate the capabilities of the LM22679 switching regulator. The LM22679 evaluation board is configured to provide an output voltage of 3.3V up to 5A load current with an input voltage range of 4.5V to 42V. Due to the low RDS(ON) of the integrated (...)

Features
  • Input Range: 4.5V to 42V
  • Output Voltage: 3.3V
  • Output Current Range: 0A to 5A
  • Frequency of Operation: 500 kHz
  • Board Size: 2 X 2 inches
  • Package: TO-263 THIN

At low input voltages between 4.5V and 6V, a minimum load of approximately 5 mA may be required to reach a regulated 3.3V output voltage. To aid in the (...)

Design tools & simulation

SIMULATION MODELS Download
SNVM137.ZIP (191 KB) - PSpice Model
SIMULATION MODELS Download
SNVM152.ZIP (49 KB) - PSpice Model
SIMULATION MODELS Download
SNVM283.ZIP (234 KB) - PSpice Model
SIMULATION MODELS Download
SNVM284.ZIP (53 KB) - PSpice Model
SIMULATION MODELS Download
SNVM828.ZIP (4 KB) - PSpice Model
SIMULATION MODELS Download
SNVM829.ZIP (1 KB) - PSpice Model
SIMULATION MODELS Download
SNVM890.ZIP (1 KB) - PSpice Model
SIMULATION MODELS Download
SNVM891.ZIP (4 KB) - PSpice Model
CALCULATION TOOLS Download

CAD/CAE symbols

Package Pins Download
TO-263 (NDR) 7 View options

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