LM22679-Q1

ACTIVE

5A SIMPLE SWITCHER, Step-Down Voltage Regulator with Adjustable Soft-Start & Current Limit

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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 Iq (Typ) (mA) 3.4 Switching frequency (Min) (kHz) 500 Switching frequency (Max) (kHz) 500 Operating temperature range (C) -40 to 125 Rating Automotive Regulated outputs (#) 1 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
Application notes Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep. 12, 2014
Application notes AN-1997 Error Amplifier Limitations in High-Performance Regulator Applications (Rev. A) May 06, 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 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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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

CAD/CAE symbols

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

Ordering & quality

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