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MAX881R

Maxim
Part Number MAX881R
Manufacturer Maxim
Description Low-Noise Bias Supply in MAX with Power-OK for GaAsFET PA
Published May 2, 2005
Detailed Description 19-1372; Rev 1; 6/98 KIT ATION EVALU E L B A AVAIL Low-Noise Bias Supply in µMAX with Power-OK for GaAsFET PA General ...
Datasheet PDF File MAX881R PDF File

MAX881R
MAX881R

Overview
19-1372; Rev 1; 6/98 KIT ATION EVALU E L B A AVAIL Low-Noise Bias Supply in µMAX with Power-OK for GaAsFET PA General Description Features o Small µMAX Package o 1mVp-p Output Voltage Ripple and Noise o Power-OK Signal to Control GaAsFET Drain Switch o 0.
05µA Logic-Controlled Shutdown o 1ms Guaranteed Start-Up o 2.
5V to 5.
5V Input o -0.
5V to (-VIN + 0.
6V) Output at up to 4mA o Operates with One 4.
7µF and Three 0.
22µF Capacitors (no inductors needed) MAX881R 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 µMAX package.
Applications Cell Phones PCS Phones PHS Phones Wireless Handsets Wireless Modems Two-Way Pagers Mobile Radios Wireless Computers PART MAX881REUB Ordering Information TEMP.
RANGE -40°C to +85°C PIN-PACKAGE 10 µMAX Typical Operating Circuit TOP VIEW INPUT 2.
5V TO 5.
5V IN OUT C1+ 1 OUTPUT -2V (OR ADJ) 4mA, 1mVp-p RIPPLE Pin Configuration 10 IN 9 N.
C.
GND OUT FB MAX881R ON OFF SHDN C1NEGOUT 2 3 4 5 MAX881R 8 7 6 C1+ POK C1NEGOUT FB GND CONTROLS GaAsFET PA’s DRAIN SWITCH POK SHDN µMAX N.
C.
= NOT INTERNALLY CONNECTED ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: htt...


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