MAX4473

低成本、低电压、PA功率控制放大器,用于GSM应用


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说明

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.
MAX4473:典型工作电路 MAX4473:典型工作电路 放大+

关键特性

  • 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

应用

  • 无绳电话
  • GSM蜂窝电话
  • 高频伺服环路
  • 精密电流控制
Part NumberAmps.Rail to RailVSUPPLY (Total)
(V)
VSUPPLY (Total)
(V)
ICC per Amp.
(µA)
VOS
(µV)
CMRR @DC
(dB)
PSRR @DC
(dB)
Input IBIAS
(nA)
Unity Gain BW
(MHz)
Slew Rate
(V/µs)
Package/PinsBudgetary
Price
minmaxtypmaxtyptypmaxtyptypSee Notes
MAX4473 1Input/Output2.76.5120020008590100021.8
SOIC (N)/8
UMAX/8
$1.84 @1k
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Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。

技术资料

应用笔记 1800 Smart IC Maintains Uniform Bias Current for GaAs MESFETs

质量和环境数据

产品可靠性报告: MAX4473.pdf 
无铅封装的锡(Sn)晶须报告
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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