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LM3679

ACTIVE

3MHz, 350mA Miniature Step-Down DC-DC Converter for Ultra Low Profile Applications

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Data sheet

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NEW TPS62843 ACTIVE 1.8-V to 5.5-V input, 600-mA ultra-low IQ step-down converter Smaller solution size with 275-nA IQ and 0.4-V to 3.6-V VOUT

LM3679

ACTIVE
Data sheet Order now

Product details

Iout (max) (A) 0.35 Vin (min) (V) 2.5 Vin (max) (V) 5.5 Type Converter Switching frequency (min) (kHz) 2500 Switching frequency (max) (kHz) 3500 Features Enable, Light load efficiency, Synchronous Rectification Control mode Voltage mode Vout (min) (V) 1.8 Vout (max) (V) 1.8 Rating Catalog Operating temperature range (°C) -30 to 85
Iout (max) (A) 0.35 Vin (min) (V) 2.5 Vin (max) (V) 5.5 Type Converter Switching frequency (min) (kHz) 2500 Switching frequency (max) (kHz) 3500 Features Enable, Light load efficiency, Synchronous Rectification Control mode Voltage mode Vout (min) (V) 1.8 Vout (max) (V) 1.8 Rating Catalog Operating temperature range (°C) -30 to 85
DSBGA (YPD) 5 2.02 mm² 1.616 x 1.25

  • 16 µA typical quiescent current
  • 350 mA maximum load capability
  • 3 MHz PWM fixed switching frequency (typ)
  • Automatic PFM/PWM mode switching
  • Available in 5-bump micro SMD package and UR package
  • Internal synchronous rectification for high efficiency
  • Internal soft start
  • 0.01 µA typical shutdown current
  • Operates from a single Li-Ion cell battery
  • Current overload and Thermal shutdown protection
  • Three external components required for typical applications
  • Low profile solution (0.55mm max height, includes four external components)
    •

  • 16 µA typical quiescent current
  • 350 mA maximum load capability
  • 3 MHz PWM fixed switching frequency (typ)
  • Automatic PFM/PWM mode switching
  • Available in 5-bump micro SMD package and UR package
  • Internal synchronous rectification for high efficiency
  • Internal soft start
  • 0.01 µA typical shutdown current
  • Operates from a single Li-Ion cell battery
  • Current overload and Thermal shutdown protection
  • Three external components required for typical applications
  • Low profile solution (0.55mm max height, includes four external components)
    •

    The LM3679 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 2.5V to 5.5V. It provides up to 350mA load current, over the entire input voltage range. The LM3679 output voltage can be configured to 1.2V, 1.5V, or 1.8V.

    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 ~ 80mA to 350mA 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 low), the device turns off and reduces battery consumption to 0.01 µA (typ).

    The LM3679 is available in a lead-free (No PB) 5-bump micro SMD package, 0.6mm height, and in an ultra thin 0.3mm height UR package. Using the UR package along with specific external components, allows for a low profile solution size with a max height of 0.55mm. 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. .

    The LM3679 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 2.5V to 5.5V. It provides up to 350mA load current, over the entire input voltage range. The LM3679 output voltage can be configured to 1.2V, 1.5V, or 1.8V.

    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 ~ 80mA to 350mA 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 low), the device turns off and reduces battery consumption to 0.01 µA (typ).

    The LM3679 is available in a lead-free (No PB) 5-bump micro SMD package, 0.6mm height, and in an ultra thin 0.3mm height UR package. Using the UR package along with specific external components, allows for a low profile solution size with a max height of 0.55mm. 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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    Type Title Date
    * Data sheet 3MHz, 350mA Mini Step-Down DC-DC Conv for Ultra Low Profile Apps (ht < 0.55mm) datasheet (Rev. A) 05 Feb 2008
    EVM User's guide AN-1682 LM3679TL Evaluation Board (Rev. C) 30 Apr 2013

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