低噪声、稳压型、负输出电荷泵，用于GaAsFET偏置电源

 

器件号	Replacement	Explanation

说明

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The MAX850-MAX853 low-noise, inverting, charge-pump power supplies are ideal for biasing GaAsFETs in cellular telephone transmitter amplifiers.

The MAX850-MAX852 offer both preset (-4.1V) and adjustable (-0.5V to -9.0V) output voltages. The MAX853 uses an external positive control voltage to set the negative output voltage. Input voltage range for all four devices is 4.5V to 10V. Output current is 5mA.

An internal linear regulator reduces the output voltage ripple to 2mV_P-P. With a well-filtered control voltage (V_CTRL), the MAX853 achieves typical output ripple of less than 1mV_P-P. Supply current is 3mA max, and shutdown current is less than 1µA max over temperature (5µA max for MAX851).

MAX850、MAX851、MAX852、MAX853：典型工作电路 放大+

关键特性

• Fixed -4.1V or Adjustable -0.5V to -9V Output at 5mA
• 4.5V to 10V Input Voltage Range
• 2mV_P-P Output Voltage Ripple (MAX850-MAX852)
• 1mV_P-P Output Voltage Ripple (MAX853)
• 100kHz Charge-Pump Switching Frequency (MAX850/MAX851/MAX853)
• External Synchronizing Clock Input (MAX852)
• Logic-Level Shutdown Mode: 1µA Max Over Temperature (MAX850/MAX852/MAX853)
• Low Cost, 8-Pin SO Package

应用

• 蜂窝电话
• 连续可调的GaAsFET偏置
• LCD偏置对比度控制
• 负电源调节电源
• 个人通信装置、PDA
• 无线数据记录仪