2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5


Product details


Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Vout (Min) (V) 1.1 Vout (Max) (V) 3.3 Iout (Max) (A) 0.6 Iq (Typ) (uA) 300 Switching frequency (Min) (kHz) 1600 Switching frequency (Max) (kHz) 2600 Features Enable, Synchronous Rectification Operating temperature range (C) -30 to 85 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 open-in-new Find other Buck converters (integrated switch)


  • Input Voltage Range From 2.7 V to 5.5 V
  • 600-mA Maximum Load Current
  • Available in Fixed and Adjustable Output Voltages
    Ranging From 1 V to 3.3 V
  • Operates From a Single Li-Ion Cell Battery
  • Internal Synchronous Rectification for High
  • Internal Soft-Start
  • 0.01-µA Typical Shutdown Current
  • 2-MHz PWM Fixed Switching Frequency (typical)
  • Current Overload Protection and Thermal
    Shutdown Protection
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The LM3674 step-down DC-DC converter is optimized for powering low-voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7 V to 5.5 V. It provides up to 600-mA load current over the entire input voltage range. There are several fixed output voltages and adjustable output voltage versions.

The device offers superior features and performance for mobile phones and similar portable systems. During the Pulse Width Modulation (PWM) mode, the device operates at a fixed-frequency of 2 MHz (typical). Internal synchronous rectification provides high efficiency during the PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typical).

The LM3674 is available in a 5-pin SOT-23 package. A high switching frequency of 2 MHz (typical) allows use of only three tiny external surface-mount components, an inductor and two ceramic capacitors.

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Similar but not functionally equivalent to the compared device:
TPS82671 ACTIVE 600mA Fully Integrated, Low Noise Step-Down Converter Module in MicroSiP™ Package For smaller BOM size and ease-of-use check out the module alternative with integrated inductor, input and output capacitor.

Technical documentation

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Type Title Date
* Data sheet LM3674 2-MHz, 600-mA Step-Down DC-DC Converter in SOT-23 datasheet (Rev. G) Apr. 24, 2015
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application note A Topical Index of TI Low Power Buck DC/DC Application Notes Jan. 17, 2018
User guide 2-Port USB 3.0 Hub (TIDA-00287) Aug. 01, 2014
User guide AN-1427 LM3674 Evaluation Board (Rev. K) Apr. 30, 2013

Design & development

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

Hardware development

document-generic User guide

The LM3674 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. The LM3674 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails (...)

  • 600mA max load current
  • Input voltage range from 2.7V to 5.5V
  • Available in fixed and adjustable output voltages ranging from 1.0V to 3.3V
  • Operates from a single Li-Ion cell Battery
  • Internal synchronous rectification for high efficiency
  • Internal soft start
  • 0.01 microA typical shutdown current
  • 2 MHz PWM fixed (...)

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

2-Port USB 3.0 hub reference design
TIDA-00287 This verified reference design is a two-port, USB 3.0 compliant hub.  It provides simultaneous SuperSpeed and high-speed/full-speed connections on the upstream port and provides SuperSpeed, high-speed, full-speed, or low-speed connections on the downstream ports.

The hub design provides power control (...)

document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SOT-23 (DBV) 5 View options

Ordering & quality

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