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Maxim产品 - MAX4473介绍

MAX4473 - 低成本、低电压、PA功率控制放大器，用于GSM应用

MAX4473是Maxim美信半导体公司的一款放大器产品，MAX4473是低成本、低电压、PA功率控制放大器，用于GSM应用，本站介绍了MAX4473的封装应用图解、特点和优点、功能等，并给出了与MAX4473相关的Maxim元器件型号供参考。

MAX4473 - 低成本、低电压、PA功率控制放大器，用于GSM应用 - 放大器 - Maxim美信半导体高性能芯片品质 - 美信半导体

产品概述

The MAX4473 PA power control IC is intended for closed-loop bias control of GSM power amplifiers. The device facilitates accurate control of the current delivered to the power amplifier (PA) through a control voltage. The error amplifier senses the voltage drop across an external current-sense resistor placed between the supply and the PA. The output of the error amplifier adjusts the PA gain until the current is proportional to the power control voltage applied to the MAX4473. This unique topology is useful in time-division-multiple-access (TDMA) systems, such as GSM, where accurate transmit burst shaping and power control is required. User-selectable current sensing and gain setting resistors maximize flexibility.

The MAX4473 operates from a single 2.7V to 6.5V supply and typically draws 1.2mA of supply current. The error amplifier has a common-mode range that extends from 1V to VCC. The power control input and error amplifier outputs swing rail-to-rail. A low-power shutdown mode reduces supply current to less than 1µA and activates an on-board active pull-down at the error amplifier output. Fast enable/disable times of 0.9µs reduce average power consumption without compromising dynamic performance. The MAX4473 is available in a space-saving 8-pin µMAX® package.

关键特性
  • 以下关键特性由Maxim美信半导体提供：
  • Optimized for GSM Timing Requirements
  • 2.7V to 6.5V Single-Supply Operation
  • 1.2mA Supply Current
  • ≤ 1µA Supply Current in Shutdown Mode
  • Guaranteed 1.5µs Enable/Disable Times
  • Active Output Pull-Down in Shutdown Mode
  • Rail-to-Rail Error Amplifier Output
  • Rail-to-Rail Power Control Input
  • Output Drive Capability–500Ω and 300pF Loads
  • 1V to VCC Current Sense Input Common-Mode Voltage Range
  • No Phase-Reversal for Common-Mode Voltage from 0 to VCC
  • External Current Sensing and Gain Setting Resistors Maximize Flexibility
  • Available in a Space-Saving 8-Pin µMAX
    • 热门应用
  • 无绳电话
  • GSM蜂窝电话
  • 高频伺服环路
  • 精密电流控制
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