MAX840, MAX843, MAX844 Low-Noise, Regulated, -2V GaAsFET Bias

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 0.22F.
An internal linear Regulator reduces the MAX840 's output 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 750A, and reduces to less than 1A in shutdown MAX840 MAX843 . The MAX844 's unregulated output is active in shutdown, with the Charge Pump switching at 20kHz. It provides a low-power LCD supply.
By Maxim Integrated Products
MAX844 's PackagesMAX844 's pdf datasheet
MAX844ESA SOIC
MAX844ESA-T SOIC
MAX844ESAT SOIC
MAX844ISA SOIC
MAX844ISA-T SOIC
MAX844ISAT SOIC




MAX844 Pinout, Pinouts
MAX844 pinout,Pin out
This is one package pinout of MAX844,If you need more pinouts please download MAX844's pdf datasheet.

MAX844 Application circuits
MAX844 circuits
This is one application circuit of MAX844,If you need more circuits,please download MAX844's pdf datasheet.


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