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MAX4473 - Low-Cost / Low-Voltage / PA Power Control Amplifier

General Description

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) via a control voltage.

Key Features

  • o Optimized for GSM Timing Requirements o +2.7V to +6.5V Single-Supply Operation o 1.2mA Supply Current o ≤1µA Supply Current in Shutdown Mode o Guaranteed 1.5µs Enable/Disable Times o Active Output Pull-Down in Shutdown Mode o Rail-to-Rail Error Amplifier Output o Rail-to-Rail Power Control Input o Output Drive Capability.
  • 500Ω and 300pF Loads o +1V to VCC Current Sense Input Common-Mode Voltage Range o No Phase-Reversal for Common-Mode Voltage from 0 to VCC o External Current Sensing an.

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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.

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19-1448; Rev 0; 3/99 Low-Cost, Low-Voltage, PA Power Control Amplifier for GSM Applications in 8-Pin µMAX General Description 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) via 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-multipleaccess (TDMA) systems, such as GSM, where accurate transmit burst shaping and power control is required.