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低噪声偏置电源、µMAX封装,带有电源就绪指示,用于GaAsFET PA

1mVP-P输出电压纹波

产品详情

主要特征

应用/用途

Parametric specs for Charge Pumps
Topology Inverter
Regulated
VIN (V) (min) 2.5
VIN (V) (max) 5.5
IOUT (A) (typ) 0.01
Unadj. VOUT (V) -2
Adj. VOUT (V) (min) -VIN-0.6
Adj. VOUT (V) (max) -0.5
ICC (mA) (max) 0.95
Switching Frequency (kHz) 100
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/10
Budgetary
Price (See Notes)
2.14
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简化框图

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参量

Parametric specs for Charge Pumps
Topology Inverter
Regulated
VIN (V) (min) 2.5
VIN (V) (max) 5.5
IOUT (A) (typ) 0.01
Unadj. VOUT (V) -2
Adj. VOUT (V) (min) -VIN-0.6
Adj. VOUT (V) (max) -0.5
ICC (mA) (max) 0.95
Switching Frequency (kHz) 100
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/10
Budgetary
Price (See Notes)
2.14

主要特征

  • Small µMAX Package
  • 1mVP-P Output Voltage Ripple and Noise
  • Power-OK Signal to Control GaAsFET Drain Switch
  • 0.05µA Logic-Controlled Shutdown
  • 1ms Guaranteed Startup
  • 2.5V to 5.5V Input
  • -0.5V to (-VIN + 0.6V) Output at up to 4mA
  • Operates with One 4.7µF and Three 0.22µF Capacitors (no inductors needed)

应用/用途

  • 蜂窝电话无线调制解调器
  • PCS电话,双向寻呼
  • PHS手机,无线装置
  • 无线手机,无线计算机

描述

The MAX881R low-noise, inverting power supply is designed for biasing GaAsFET power amplifiers in portable wireless applications. This device is a chargepump inverter followed by a negative linear regulator. The input voltage range is 2.5V to 5.5V. The output is preset at -2.0V or can be set, using two resistors, to any voltage from -0.5V to (-VIN + 0.6V). It can deliver up to 4mA. The internal linear regulator also filters the output to 1mVP-P ripple and noise.

Other features include a power-OK (active-low POK) output that signals when the negative voltage is within 7.5% of its set point. It protects the GaAsFET by not allowing power to be applied to the GaAsFET's drain until it is properly biased. The signal can be routed either to a microcontroller or directly to a switch at the GaAsFET drain. The MAX881R is available in a 10-pin µMAX® package.

简化框图

MAX881R:典型工作电路 MAX881R:典型工作电路 Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心