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LM3253 - High-Current Step-Down Converter

Description

The LM3253 is a DC-DC converter optimized for powering multi-mode 2G/3G/4G RF power amplifiers (PAs) from a single Lithium-Ion cell.

The LM3253 steps down an input voltage from 2.7V to 5.5V to a dynamically adjustable output voltage of 0.4V to 3.6V.

Features

  • 1.
  • 2 High-Efficiency PFM and PWM Modes with Internal Synchronous Rectification.
  • Analog Bypass Function with Low Dropout Resistance (45 mΩ typ. ).
  • Dynamically Adjustable Output Voltage, 0.4V to 3.6V (typ. ), in PFM and PWM modes.
  • 3A Maximum Load Current in PWM Mode.
  • 2.7MHz (average) PWM Switching Frequency.
  • Modulated Switching Frequency to Aid Rx Band Compliance.
  • Operates From a Single Li-ion Cell (2.7V to 5.5V).
  • ACB Reduces Ind.

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Full PDF Text Transcription

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LM3253 www.ti.com SNVS791Q – FEBRUARY 2012 – REVISED MAY 2013 LM3253 High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers Check for Samples: LM3253 FEATURES 1 •2 High-Efficiency PFM and PWM Modes with Internal Synchronous Rectification • Analog Bypass Function with Low Dropout Resistance (45 mΩ typ.) • Dynamically Adjustable Output Voltage, 0.4V to 3.6V (typ.), in PFM and PWM modes • 3A Maximum Load Current in PWM Mode • 2.7MHz (average) PWM Switching Frequency • Modulated Switching Frequency to Aid Rx Band Compliance • Operates From a Single Li-ion Cell (2.7V to 5.
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