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


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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 from 2.7V to 5.5V. It provides up to 600mA load current, over the entire input voltage range. There are several fixed output voltages and adjustable output voltage versions. This device offers superior features and performance for mobile phones and similar portable systems. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ). Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 microA (typ).

  • 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 switching frequency (typ)
  • SOT23-5 package
  • Current overload protection and Thermal shutdown protection


  • Mobile phones
  • PDAs
  • MP3 players
  • Portable instruments
  • W-LAN
  • Digital still Cameras
  • Portable Hard disk drives


Buck converters (integrated switch)
LM3674 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5

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Evaluation board

LM3674MF-1.8EV – 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5

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Technical documentation

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Type Title Date
More literature LM3674MF-1.8EV EU Declaration of Conformity (DoC) Jan. 02, 2019
User guide AN-1427 LM3674 Evaluation Board (Rev. K) Apr. 30, 2013

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