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2MHz, 600mA Step-Down DC-DC Converter in SOT23-5 and 5-Bump Micro SMD



  • 16 microA typical quiescent current
  • 600 mA maximum load capability
  • 2 MHz PWM fixed switching frequency (typ)
  • Automatic PFM/PWM mode switching
  • Available in fixed output voltages as well as an adjustable version
  • SOT23-5 package
  • Internal synchronous rectification for high efficiency
  • Internal soft start
  • 0.01 microA typical shutdown current
  • Operates from a single Li-Ion cell or 3 cell NiMH/NiCd batteries
  • Only three tiny surface-mount external components required (one inductor, two ceramic capaitors)
  • Current overload protection


  • Mobile phones
  • PDAs
  • MP3 players
  • W-LAN
  • Portable Instruments
  • Digital still cameras
  • Portable Hard disk Drives


Texas Instruments  LM3671TL-1.8EV

The LM3671 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. The LM3671 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 600 mA load current, over an input voltage range from 2.8V to 5.5V. There are several different fixed voltage output options available as well as an adjustable output voltage version. This device offers superior features and performance for mobile phones and similar portable applications with complex power management systems.