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LM2670

ACTIVE

SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync

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Data sheet

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LM2670

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck Iout (max) (A) 3 Vin (max) (V) 40 Vin (min) (V) 6.5 Vout (max) (V) 37 Vout (min) (V) 1.23 Features Frequency synchronization, Over Current Protection Control mode Voltage mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0042 Duty cycle (max) (%) 91
Rating Catalog Topology Buck Iout (max) (A) 3 Vin (max) (V) 40 Vin (min) (V) 6.5 Vout (max) (V) 37 Vout (min) (V) 1.23 Features Frequency synchronization, Over Current Protection Control mode Voltage mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0042 Duty cycle (max) (%) 91
TO-263 (KTW) 7 153.924 mm² (10.1 mm × 15.24 mm) TO-220 (NDZ) 7 82.6008 mm² (10.16 mm × 8.13 mm) VSON (NHM) 14 30 mm² (6 mm × 5 mm)
  • Efficiency up to 94%
  • Simple and easy to design with (using off-the-shelf external components)
  • 150mΩ DMOS output switch
  • 3.3V, 5V, 12V fixed output and adjustable (1.2V to 37V) versions
  • 50µA standby current when switched OFF
  • ±2% maximum output tolerance over full line and load conditions
  • 8V to 40V wide Input voltage range
  • External sync clock capability (280kHz to 400kHz)
  • 260kHz fixed frequency internal oscillator
  • –40 to 125°C operating junction temperature range
  • Create a custom design using the LM2670 with the WEBENCH® Power Designer
  • Efficiency up to 94%
  • Simple and easy to design with (using off-the-shelf external components)
  • 150mΩ DMOS output switch
  • 3.3V, 5V, 12V fixed output and adjustable (1.2V to 37V) versions
  • 50µA standby current when switched OFF
  • ±2% maximum output tolerance over full line and load conditions
  • 8V to 40V wide Input voltage range
  • External sync clock capability (280kHz to 400kHz)
  • 260kHz fixed frequency internal oscillator
  • –40 to 125°C operating junction temperature range
  • Create a custom design using the LM2670 with the WEBENCH® Power Designer

The LM2670 series of regulators are monolithic, integrated circuits, which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 3A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3V, 5V, and 12V output version.

The SIMPLE SWITCHER power converter concept provides for a complete design using a minimum number of external components. The switching clock frequency can be provided by an internal fixed frequency oscillator (260kHz) or from an externally provided clock in the range of 280kHz to 400kHz which allows the use of physically smaller sized components. A family of standard inductors for use with the LM2670 are available from several manufacturers to greatly simplify the design process. The external sync clock provides direct and precise control of the output ripple frequency for consistent filtering or frequency spectrum positioning.

The LM2670 series also has built-in thermal shutdown, current limiting, and an ON and OFF control input that can power down the regulator to a low 50µA quiescent current standby condition. The output voltage is specified to a ±2% tolerance.

The LM2670 series of regulators are monolithic, integrated circuits, which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 3A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3V, 5V, and 12V output version.

The SIMPLE SWITCHER power converter concept provides for a complete design using a minimum number of external components. The switching clock frequency can be provided by an internal fixed frequency oscillator (260kHz) or from an externally provided clock in the range of 280kHz to 400kHz which allows the use of physically smaller sized components. A family of standard inductors for use with the LM2670 are available from several manufacturers to greatly simplify the design process. The external sync clock provides direct and precise control of the output ripple frequency for consistent filtering or frequency spectrum positioning.

The LM2670 series also has built-in thermal shutdown, current limiting, and an ON and OFF control input that can power down the regulator to a low 50µA quiescent current standby condition. The output voltage is specified to a ±2% tolerance.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LM2670 SIMPLE SWITCHER® Power Converter, High-Efficiency, 3A, Step-Down Voltage Regulator With Sync datasheet (Rev. L) PDF | HTML Jun 25, 2025
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML Mar 25, 2024
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep 12, 2014
Application note AN-1187 Leadless Leadframe Package (LLP) (Rev. R) May 7, 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr 24, 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr 23, 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr 23, 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr 23, 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 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-1Positive-to-Negative Buck-Boost Converter Using LM267x SIMPLE SWITCHER (Rev. E) Apr 23, 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 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 Simple Techniques Minimize Cross-Coupling in Distributed Power Systems Mar 21, 2007
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 3, 2004

Design & development

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Package Pins CAD symbols, footprints & 3D models
TO-263 (KTW) 7 Ultra Librarian
TO-220 (NDZ) 7 Ultra Librarian
VSON (NHM) 14 Ultra Librarian
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