19-0388; Rev 1; 3/96
UAL IT MAN TION K A ET U E L H A S EV TA WS DA FOLLO
Low-Noise, Regulated, -2V GaAsFET Bias
_______________General Description
The MAX840/MAX843/MAX844 low-noise, inverting charge-pump power supplies are ideal for biasing GaAsFETs in cellular telephone transmitter
amplifiers.
They operate with inputs down to 2.
5V.
The MAX840 offers both a -2V preset output and a -0.
5V to -9.
4V adjustable output.
The MAX843/MAX844 use an external positive control
voltage to set the negative output
voltage.
Input
voltage range for all the devices is 2.
5V to 10V, and output current is 4mA with VIN 2.
7V.
These circuits can operate with small
capacitors, as low as 0.
22µF.
An internal line...