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MAX77271 - Multimode PA Step-Down Converter

Description

The MAX77271 step-down converter is optimized for powering the power amplifier (PA) in multistandard handsets such as LTE, WCDMA, TD-SCDMA, GSM, and EDGE.

Features

  • PA Step-Down Converter.
  • 7µs (typ) Settling Time for 0.7V to 3.4V Output Voltage Change.
  • Dynamic Output Voltage Setting from 0.5V to VIN.
  • 85mΩ PFET and 100% Duty Cycle for Low Dropout.
  • 3MHz Switching Frequency.
  • Low Output Voltage Ripple.
  • 2% Output Voltage Accuracy Over Load, Line, and Temperature.
  • Tiny External Components.
  • 2.5A Output Current Capability.
  • Simple Logic On/Off Control.
  • Low 0.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
MAX77271 Multimode PA Step-Down Converter with Linear Bypass Mode General Description The MAX77271 step-down converter is optimized for powering the power amplifier (PA) in multistandard handsets such as LTE, WCDMA, TD-SCDMA, GSM, and EDGE. The device integrates a high-efficiency PWM stepdown converter for medium- and low-power transmission with an 85mΩ (typ) low dropout (LDO) bypass regulator, in parallel with the step-down converter, enabling highpower transmission. The IC uses an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment. The bypass LDO powers the PA directly from the battery during high-power transmission or in case of insufficient headroom between the input and programmed output.
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