3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits


Product details


Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Vout (Min) (V) 1.2 Vout (Max) (V) 3.3 Iout (Max) (A) 0.6 Iq (Typ) (mA) 0.016 Iq (Typ) (uA) 16 Switching frequency (Min) (kHz) 2500 Switching frequency (Max) (kHz) 3500 Features Enable, Light Load Efficiency, 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

DSBGA (YZR) 5 2 mm² 1.524 x 1.143 USON (NGE) 6 3 mm² 2 x 1.5 open-in-new Find other Buck converters (integrated switch)


  • 16 µA typical quiescent current
  • 600 mA maximum load capability
  • 3 MHz PWM fixed switching frequency (typ.)
  • Automatic PFM/PWM mode switching
  • Available in 5-bump DSBGA package and 6-pin USON package
  • Internal synchronous rectification for high efficiency
  • Internal soft start
  • 0.01 µA typical shutdown current
  • Operates from a single Li-Ion cell battery
  • Only three tiny surface-mount external components required (solution size less than 20 mm2)
  • Current overload and thermal shutdown protection

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The LM3677 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600 mA load current over the entire input voltage range. The LM3677 is configured to different fixed voltage output options as well as an adjustable output voltage version range from 1.2V to 3.3V.

The device offers superior features and performance for mobile phones and similar portable applications with complex power management systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode operation, the device operates at a fixed frequency of 3 MHz (typ). PWM mode drives loads from ~ 80 mA to 600 mA max. Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ.) during light load and standby operation. Internal synchronous rectification provides high efficiency. In shutdown mode (Enable pin pulled down), the device turns off and reduces battery consumption to 0.01 µA (typ.).

The LM3677 is available in a lead-free (NOPB) 5-bump DSBGA package and 6-pin USON package. A switching frequency of 3 MHz (typ.) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required.

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Technical documentation

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Type Title Date
* Datasheet 3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits datasheet (Rev. F) May 02, 2013
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
User guides AN-1595 LM3677 Evaluation Board (Rev. C) Apr. 30, 2013

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CAD/CAE symbols

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DSBGA (YZR) 5 View options
USON (NGE) 6 View options

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