MAX881R

PRODUCTION

Low-Noise Bias Supply in µMAX with Power OK for GaAsFET PA

1mVP-P Output Voltage Ripple

Data Sheet (Rev. 2) Product Selection Table
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Overview

  • 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)

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.

Applications

  • Cell Phones Wireless Modems
  • PCS Phones Two-Way Pagers
  • PHS Phones Mobile Radios
  • Wireless Handsets Wireless Computers
MAX881R
Low-Noise Bias Supply in µMAX with Power OK for GaAsFET PA
MAX881R: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Evaluation Design File 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Charge Pumps 1
MAX852
Low-Noise, Regulated, Negative Charge Pump Power Supplies for GaAsFET Bias
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Evaluation Kits

MAX881REVKIT

Evaluation Kit for the MAX881R

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Features and Benefits

  • 1mVp-p Output Voltage Ripple
  • 2.5V to 5.5V Input Range
  • Uses One 4.7µF and Three 1µF Ceramic Capacitors
  • -2V Regulated Output (or Adjustable)
  • 4mA Output Current
  • Power OK (POK-bar) Output
  • Fully Assembled and Tested Surface-Mount Board

Product Details

The MAX881R IC is an inverting, charge-pump DC-DC converter with a low-noise, regulated output. Low output ripple voltage makes this device ideal for biasing the GaAsFETs commonly found in cellular telephone transmitters.

The MAX881R evaluation kit (EV kit) is a fully assembled and tested surface-mount board. Provisions are made for mounting a second voltage-divider resistor, which is required for setting output voltages other than -2V. A special scope-probe socket is also mounted on the board, so output noise can be observed on an oscilloscope.

Applications

  • Cell Phones
  • Mobile Radios
  • PCS Phones
  • PHS Phones
  • Two-Way Paging
  • Wireless Computers
  • Wireless Handsets
  • Wireless Modems
MAX881REVKIT
Evaluation Kit for the MAX881R

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