650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers


Product details


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Package | Pins | Size

DSBGA (YZR) 8 3 mm² 1.722 x 1.871 WSON (DSC) 10 9 mm² 3 x 3 open-in-new Find other Buck converters (integrated switch)


  • 2 MHz (typ.) PWM Switching Frequency
  • Operates from a Single Li-Ion Cell (2.7V to 5.5V)
  • Variable Output Voltage (0.8V to 3.6V)
  • Fast Output Voltage Transient (0.8V to 3.6V in 20µs)
  • 650mA Maximum Load Capability
  • High Efficiency (96% Typ at 4.2VIN, 3.4VOUT at 400mA) from Internal Synchronous Rectification
  • Current Overload Protection
  • Thermal Overload Protection
  • Packages
    8-Pin DSBGA (Lead Free)
  • 10-Pin WSON

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The LM3205 is a DC-DC converter optimized for powering 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 LM3205 offers superior performance for mobile phones and similar RF PA applications. Fixed-frequency PWM operation minimizes RF interference. Shutdown function turns the device off and reduces battery consumption to 0.01 µA (typ.).

The LM3205 is available in DSBGA package and WSON package. For all other package options contact your local TI sales office.

A high switching frequency (2 MHz) allows use of tiny surface-mount components. Only three small 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 LM3205 650mA Mini, Adj, Step-Down DC-DC Cnvtr for RF Pwr Amps datasheet (Rev. E) Apr. 02, 2013
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
User guides AN-1413 LM3205 Evaluation Board (Rev. A) Apr. 30, 2013
Application notes Optimizing RF Power Amplifier System Efficiency Using DC-DC Converters Mar. 21, 2007

Design & development

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CAD/CAE symbols

Package Pins Download
DSBGA (YZR) 8 View options
WSON (DSC) 10 View options

Ordering & quality

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