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.

LM22677

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Data sheet

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Product details

Iout (max) (A)

5

Vin (min) (V)

4.5

Vin (max) (V)

42

Type

Converter

Switching frequency (min) (kHz)

200

Switching frequency (max) (kHz)

1000

Features

Enable, Frequency synchronization, Over Current Protection

Control mode

Voltage mode

Vout (min) (V)

1.285

Vout (max) (V)

37

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Iout (max) (A)

5

Vin (min) (V)

4.5

Vin (max) (V)

42

Type

Converter

Switching frequency (min) (kHz)

200

Switching frequency (max) (kHz)

1000

Features

Enable, Frequency synchronization, Over Current Protection

Control mode

Voltage mode

Vout (min) (V)

1.285

Vout (max) (V)

37

Rating

Catalog

Operating temperature range (°C)

-40 to 125

TO-263 (NDR)

7

142.3416 mm² 10.16 x 14.01

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)	PDF \| HTML	11 Aug 2015
	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
	Technical article	Quantifying the value of wide VIN	PDF \| HTML	15 Jun 2016
	Technical article	DC/DC converter datasheets – System losses demystified	PDF \| HTML	25 Apr 2016
	Technical article	DC/DC converter datasheets – System efficiency demystified	PDF \| HTML	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
	EVM User's 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

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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 (...)

User guide: PDF

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Simulation model

LM22677-5.0 PSpice Average Model

SNVM276.ZIP (50 KB) - PSpice Model

LM22677

SIMPLE SWITCHER® 4.5V to 42V, 5A Step-Down DC/DC Switching Reg. with Frequency Synchronization

A newer version of this product is available

Same functionality with different pin-out to the compared device

LM22677

Product details

Technical documentation

Design & development

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

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

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