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LM3207 - Step-Down DC-DC Converter

Description

The LM3207 is a DC-DC converter optimized for powering WCDMA / CDMA RF power amplifiers (PAs) from a single Lithium-Ion cell; however they may be used in many other applications.

It steps down an input voltage from 2.7V to 5.5V to a variable output voltage from 0.8V(typ.) to 3.6V(typ.).

Features

  • 2MHz (typ. ) PWM Switching Frequency.
  • Operates from a single Li-Ion cell (2.7V to 5.5V).
  • Variable Output Voltage (0.8V to 3.6V).
  • 650mA Maximum load capability.
  • High Efficiency (95% Typ at 3.9VIN, 3.4VOUT at 400mA) from internal synchronous rectification.
  • Integrated Vref LDO.
  • Regulated LDO Output up to 10mA max.
  • Fast 3uS Vref LDO On/Off Time.
  • 9-pin micro SMD Package.
  • Current Overload Protection.
  • Thermal Overload Protection.

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LM3207 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers April 2007 LM3207 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers with Integrated Vref LDO General Description The LM3207 is a DC-DC converter optimized for powering WCDMA / CDMA RF power amplifiers (PAs) from a single Lithium-Ion cell; however they may be used in many other applications. It steps down an input voltage from 2.7V to 5.5V to a variable output voltage from 0.8V(typ.) to 3.6V(typ.). Output voltage is set using a VCON analog input for controlling power levels and efficiency of the RF PA. The LM3207 also provides a regulated reference voltage (Vref) required by linear RF power amplifiers through an integrated LDO that has a maximum Iref up to 10 mA.
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