LM22678-Q1

ACTIVE

5A SIMPLE SWITCHER, Step-Down Voltage Regulator with Precision Enable

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Product details

Parameters

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Package | Pins | Size

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

Features

  • New product available: LM61460 3-V to 36-V, 6-A low EMI synchronous converter
  • 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
  • Precision enable pin
  • Integrated bootstrap diode
  • Integrated soft start
  • Fully WEBENCH enabled
  • LM22678-Q1 is an automotive-grade product that is AEC-Q100 grade 1 qualified (–40°C to +125°C operating junction temperature)
  • PFM (exposed pad) package

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Description

The LM22678 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. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typical). Built-in soft-start (500 µs, typical) saves external components. The LM22678 device also has built-in thermal shutdown, and current limiting to protect against accidental overloads.

The new product, LM61460, offers higher efficiency, lower stand-by quiescent current, and improved EMI performance. See the device comparison table to compare.Start WEBENCH design with LM61460

The LM22678 device is a member of Texas Instruments’ 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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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LM73605-Q1 ACTIVE Automotive Qualified 3.5V to 36V, 5A Synchronous Step-Down Voltage Converter Next-generation 3.5-V to 36-V, 5-A synchronous step-down voltage converter.

Technical documentation

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Type Title Date
* Datasheet LM22678/-Q1 42-V, 5-A SIMPLE SWITCHER® Step-Down Voltage Regulator datasheet (Rev. M) Oct. 23, 2020
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep. 12, 2014
Application note AN-1997 Error Amplifier Limitations in High-Performance Regulator Applications (Rev. A) May 06, 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr. 23, 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) Apr. 23, 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr. 23, 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) Apr. 23, 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) Apr. 23, 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr. 23, 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr. 23, 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
User guide SIMPLE SWITCHER® Design Guide Apr. 11, 2011
Application note Input and Output Capacitor Selection Sep. 19, 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul. 12, 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) May 03, 2004

Design & development

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Design tools & simulation

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TO-263 (NDR) 7 View options

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