19-0238; Rev 2; 4/96
Low-Noise, Regulated, Negative Charge-Pump Power Supplies for GaAsFET Bias
_______________General Description
The MAX850–MAX853 low-noise, inverting, chargepump power supplies are ideal for biasing GaAsFETs in cellular telephone transmitter
amplifiers.
The MAX850–MAX852 offer both preset (-4.
1V) and adjustable (-0.
5V to -9.
0V) output
voltages.
The MAX853 uses an external positive control
voltage to set the negative output
voltage.
Input
voltage range for all four devices is 4.
5V to 10V.
Output current is 5mA.
An internal linear regulator reduces the output
voltage ripple to 2mVp-p.
With a well-filtered control
voltage (VCTRL), the MAX853 achieves typical output ripple o...