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MFG:MAX D/C:0011+
Part Number: MAX881R
MFG: MAX
D/C: 0011+
Description: The MAX881R low-noise, inverting power supply is designed for biasing GaAsFET power amplifiers in port...
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MAX881R
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DataSheet
General Description
MAX881R General Description
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 space-saving 10-pin MAX package.
MAX881R Maximum Ratings
| IN to GND | -3V to +6V |
| SHDN to GND | -3V to +6V |
| POK to GND | -0.3V to +12V |
| C1+ to GND | -0.3V to (VIN + 0.3V) |
| C1-, NEGOUT, OUT, FB to GND | -6V to (VIN + 0.3V) |
| Continuous Power Dissipation (TA = +70) 10-pin MAX (derate 4.1mW/ above +70) |
444mW |
| Operating Temperature Range | -40 to +85 |
| Junction Temperature | +150 |
| Storage Temperature Range | -65 to +165 |
| Lead Temperature (soldering, 10s) | +300 |
Note 1: The output may be shorted to NEGOUT or GND if the package power dissipation is not exceeded. Typical short-circuit current is 35mA.
MAX881R Features
` Small MAX Package
` 1mVp-p Output Voltage Ripple and Noise
` Power-OK Signal to Control GaAsFET Drain Switch
` 0.05A Logic-Controlled Shutdown
` 1ms Guaranteed Start-Up
` 2.5V to 5.5V Input
` -0.5V to (-VIN + 0.6V) Output at up to 4mA
` Operates with One 4.7F and Three 0.22F Capacitors (no inductors needed)
` 1mVp-p Output Voltage Ripple and Noise
` Power-OK Signal to Control GaAsFET Drain Switch
` 0.05A Logic-Controlled Shutdown
` 1ms Guaranteed Start-Up
` 2.5V to 5.5V Input
` -0.5V to (-VIN + 0.6V) Output at up to 4mA
` Operates with One 4.7F and Three 0.22F Capacitors (no inductors needed)
MAX881R Typical Application
·Cell Phones
·PCS Phones
·PHS Phones
·Wireless Handsets
·Wireless Modems
·Two-Way Pagers
·Mobile Radios
·Wireless Computers
·PCS Phones
·PHS Phones
·Wireless Handsets
·Wireless Modems
·Two-Way Pagers
·Mobile Radios
·Wireless Computers
MAX881R Connection Diagram
MAX881R
PDF/DataSheet Download
- Datasheet: MAX881R
- File Size: 114640 KB
- Manufacturer: Maixm
- Click here to Download
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