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LM22678

ACTIVE

SIMPLE SWITCHER® 4.5V to 42V, 5A Step-Down Voltage Regulator with Precision Enable

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Data sheet

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TLVM13660 ACTIVE 36-V input, 1-V to 6-V output, 6-A buck power module in 5-mm x 5.5-mm enhanced HotRod™ QFN Save board space, simplify design and speed time to market with an integrated-inductor power module.
TPSM63606 ACTIVE High-density, 36-V input, 1-V to 16-V output, 6-A power module in 5-mm x 5.5-mm enhanced HotRod™ QFN Save board space, simplify design, and speed up time to market with an integrated-inductor power module.

LM22678

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 5 Vin (min) (V) 4.5 Vin (max) (V) 42 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 500 Features Enable, Over Current Protection Control mode Voltage mode Vout (min) (V) 1.285 Vout (max) (V) 37 Iq (typ) (µA) 3400 Duty cycle (max) (%) 90
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 5 Vin (min) (V) 4.5 Vin (max) (V) 42 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 500 Features Enable, Over Current Protection Control mode Voltage mode Vout (min) (V) 1.285 Vout (max) (V) 37 Iq (typ) (µA) 3400 Duty cycle (max) (%) 90
TO-263 (NDR) 7 142.3416 mm² 10.16 x 14.01
  • 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
  • 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

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.

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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Technical documentation

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Type Title Date
* Data sheet LM22678/-Q1 42-V, 5-A SIMPLE SWITCHER® Step-Down Voltage Regulator With Easy-to-Use Package datasheet (Rev. M) PDF | HTML 23 Oct 2020
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25 Mar 2024
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 12 Sep 2014
Application note AN-1533 Overvoltage Protection Circuit for Automotive Load Dump (Rev. B) 06 May 2013
Application note AN-1997 Error Amplifier Limitations in High-Performance Regulator Applications (Rev. A) 06 May 2013
Application note AN-1797 TO-263 THIN Package (Rev. A) 24 Apr 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24 Apr 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 23 Apr 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 23 Apr 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 23 Apr 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 23 Apr 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 23 Apr 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 23 Apr 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 23 Apr 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 23 Apr 2013
Application note SIMPLE SWITCHER Regulators Take Over Automotive Applications (Rev. A) 23 Apr 2013
Design guide SIMPLE SWITCHER® Design Guide 11 Apr 2011
Application note Input and Output Capacitor Selection 19 Sep 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 12 Jul 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) 03 May 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

LM22678-5.0 PSpice Average Model

SNVM134.ZIP (48 KB) - PSpice Model
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Simulation model

LM22678-5.0 PSpice Transient Model

SNVM139.ZIP (177 KB) - PSpice Model
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Simulation model

LM22678-5.0 Unencrypted PSpice Average Model

SNVM888.ZIP (1 KB) - PSpice Model
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Simulation model

LM22678-5.0 Unencrypted PSpice Transient Model

SNVM889.ZIP (4 KB) - PSpice Model
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Simulation model

LM22678-ADJ PSpice Average Model

SNVM321.ZIP (52 KB) - PSpice Model
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Simulation model

LM22678-ADJ PSpice Transient Model

SNVM322.ZIP (248 KB) - PSpice Model
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Simulation model

LM22678-ADJ Unencrypted PSpice Average Model

SNVM825.ZIP (1 KB) - PSpice Model
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Simulation model

LM22678-ADJ Unencrypted PSpice Transient Model

SNVM826.ZIP (4 KB) - PSpice Model
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Calculation tool

LM2267X-22680DESIGN-CALC — LM2267x, LM22680 Quick Start Simple Switcher Component Calculator

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Package Pins CAD symbols, footprints & 3D models
TO-263 (NDR) 7 Ultra Librarian
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