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MAXIM MAX881REUB+RoHS

Manufacturer
MAXIM
MPN
MAX881REUB+
LCSC Part #
C143607
Packaging
MSOP-10
Customer #
Key Attributes
4mA MSOP-10 Special Purpose Regulators RoHS
Datasheetpdf iconMAXIM MAX881REUB+
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QtyUnit PriceTotal Amount
1+$ 6.0504$ 6.05
10+$ 5.9235$ 59.24
50+$ 5.8389$ 291.95
100+$ 5.7543$ 575.43
Standard Packaging50/Full Tube
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Products Specifications

All
TypeDescription
CategoryIntegrated Circuits (ICs)/Power Management (PMIC)/Special Purpose Regulators
ManufacturerMAXIM
PackagingMSOP-10
FeaturesOperating status indication
Output Voltage2V
Output Current4mA
Operating Temperature-40℃~+85℃
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Introduction

AI Translation

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 (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.

The MAX881R, a low-noise, inverting, regulated chargepump power supply, is designed for biasing GaAsFET devices such as power-amplifier modules in cellular handsets.

The applied input voltage (VIN) is inverted to a negative voltage at NEGOUT by a capacitive charge pump. This voltage is regulated by an internal linear regulator at OUT. With FB connected to GND, VOUT is regulated at -2V. Alternatively, use a voltage-divider at FB to adjust the output voltage between -0.5V and -(VIN - 0.6V). The internal linear regulator reduces the ripple noise induced by the charge-pump inverter to 1mVp-p at OUT. In addition, the excellent AC rejection of the linear regulator attenuates noise from the incoming supply.

The MAX881R has an active-low, open-drain, power-OK (POK) output. This output goes low when OUT reaches 92.5% of the regulated output voltage. POK can be used to drive the gate of a P-MOSFET that switches power to the GaAsFET power amplifier, thereby ensuring that the power amplifier is not powered before the required negative bias voltage is present.

The MAX881R features a shutdown mode that reduces supply current to less than 1μA.

Features

AI Translation
  • 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)

Applications

AI Translation
  • Cell Phones
  • Wireless Modems
  • PCS Phones
  • Two-Way Pagers
  • PHS Phones
  • Mobile Radios
  • Wireless Handsets
  • Wireless Computers