Product details

Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 1.285 Vout (Max) (V) 37 Iout (Max) (A) 5 Iq (Typ) (uA) 3400 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 1000 Features Enable, Frequency Synchronization, Over Current Protection Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1
Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 1.285 Vout (Max) (V) 37 Iout (Max) (A) 5 Iq (Typ) (uA) 3400 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 1000 Features Enable, Frequency Synchronization, Over Current Protection Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1
TO-263 (NDR) 7 100 mm² 10.16 x 9.85
  • 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
  • 500-kHz Default Switching Frequency
  • Adjustable Switching Frequency and
    Synchronization
  • –40°C to +125°C Operating Junction Temperature
    Range
  • Precision Enable Input
  • Integrated Boot-Strap Diode
  • Integrated Soft-Start
  • Fully WEBENCH® Enabled
  • LM22677-Q1 is an Automotive-Grade Product
    that is AEC-Q100 Grade 1 Qualified (–40°C to
    +125°C Operating Junction Temperature)
  • NDR (Exposed Pad)
  • 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
  • 500-kHz Default Switching Frequency
  • Adjustable Switching Frequency and
    Synchronization
  • –40°C to +125°C Operating Junction Temperature
    Range
  • Precision Enable Input
  • Integrated Boot-Strap Diode
  • Integrated Soft-Start
  • Fully WEBENCH® Enabled
  • LM22677-Q1 is an Automotive-Grade Product
    that is AEC-Q100 Grade 1 Qualified (–40°C to
    +125°C Operating Junction Temperature)
  • NDR (Exposed Pad)

The LM22677 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. The default switching frequency is set at 500 kHz, thus allowing for small external components and good transient response. In addition, the frequency can be adjusted over a range of 200 kHz to 1 MHz with a single external resistor. The internal oscillator can be synchronized to a system clock or to the oscillator of another regulator. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typical). The LM22677 also has built-in thermal shutdown, and current limiting to protect against accidental overloads.

The LM22677 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 LM22677 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. The default switching frequency is set at 500 kHz, thus allowing for small external components and good transient response. In addition, the frequency can be adjusted over a range of 200 kHz to 1 MHz with a single external resistor. The internal oscillator can be synchronized to a system clock or to the oscillator of another regulator. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typical). The LM22677 also has built-in thermal shutdown, and current limiting to protect against accidental overloads.

The LM22677 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 LM22677/-Q1 42-V, 5-A SIMPLE SWITCHER, Step-Down Voltage Regulator With Features datasheet (Rev. O) 11 Aug 2015
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Quantifying the value of wide VIN 15 Jun 2016
Technical article DC/DC converter datasheets – System losses demystified 25 Apr 2016
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) 19 Apr 2016
Technical article DC/DC converter datasheets – System efficiency demystified 18 Apr 2016
Application note Know Your Limits 02 Jun 2015
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
User guide AN-1892 LM22677 Evaluation Board (Rev. D) 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-2020 Thermal Design By Insight, Not Hindsight (Rev. C) 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.

Evaluation board

LM22677EVAL — LM22677 5A SIMPLE SWITCHER Regulator w/ Freq Adj or Synch and Precision Enable EVM

The LM22677 evaluation board is designed to demonstrate the capabilities of the LM22677 switching regulator. The LM22677 evaluation board schematic shown in Figure 1 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 (...)

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Limit: 5
Simulation model

LM22677-ADJ PSpice Transient Model

SNVM072.ZIP (194 KB) - PSpice Model
Simulation model

LM22677-ADJ TINA-TI Transient Spice Model

SNVM073.ZIP (21 KB) - TINA-TI Spice Model
Simulation model

LM22677-ADJ TINA-TI Steady State Transient Reference Design

SNVM074.TSC (213 KB) - TINA-TI Reference Design
Simulation model

LM22677-ADJ TINA-TI Line Transient Reference Design

SNVM075.TSC (183 KB) - TINA-TI Reference Design
Simulation model

LM22677-ADJ TINA-TI Startup Transient Reference Design

SNVM076.TSC (183 KB) - TINA-TI Reference Design
Simulation model

LM22677-ADJ TINA-TI Load Transient Reference Design

SNVM077.TSC (187 KB) - TINA-TI Reference Design
Simulation model

LM22677-ADJ PSpice Average Model (Rev. A)

SNVM078A.ZIP (59 KB) - PSpice Model
Simulation model

LM22677-ADJ TINA-TI Average Spice Model (Rev. A)

SNVM079A.ZIP (8 KB) - TINA-TI Spice Model
Simulation model

LM22677-ADJ TINA-TI Average Reference Design (Rev. A)

SNVM080A.TSC (143 KB) - TINA-TI Reference Design
Simulation model

LM22677-5.0 PSpice Transient Model

SNVM275.ZIP (204 KB) - PSpice Model
Simulation model

LM22677-5.0 PSpice Average Model

SNVM276.ZIP (50 KB) - PSpice Model
Simulation model

LM22677-5.0 Unencrypted PSpice Transient Model

SNVM822.ZIP (4 KB) - PSpice Model
Simulation model

LM22677-5.0 Unencrypted PSpice Average Model

SNVM823.ZIP (1 KB) - PSpice Model
Simulation model

LM22677-ADJ Unencrypted PSpice Transient Model

SNVM886.ZIP (4 KB) - PSpice Model
Simulation model

LM22677-ADJ Unencrypted PSpice Average Model

SNVM887.ZIP (1 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Calculation tool

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

Reference designs

TIDA-00162 — Multi Camera, Video Interface and Control Solution for Automotive Surround View Systems

TIDA-00162 incorporates the  complete  camera module, video interface  and control functionality for surround view systems for automotive applications. The reference design includes four 1 Mp cameras (OmniVision OV10635), four Serializer+Power boards and a daughter board with 6 (...)
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TO-263 (NDR) 7 View options

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  • Ongoing reliability monitoring

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