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MAX843

Maxim
Part Number MAX843
Manufacturer Maxim
Description GaAsFET Bias
Published May 6, 2014
Detailed Description 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 _____...
Datasheet PDF File MAX843 PDF File

MAX843
MAX843

Overview
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 V IN > 2.
7V.
These circuits can operate with small capacitors, as low as 0.
22µF.
An internal linear regulator reduces the MAX840’s out put voltage ripple to 1mVp-p.
With a well-filtered control voltage (VCTRL), the MAX843/MAX844 also achieve less than 1mVp-p typical output ripple.
Supply current is 750µA, and reduces to less than 1 µA in shutdown (MAX840/MAX843).
The MAX844’s unregulated outpu...


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