MAX844C/D

The MAX844C/D is designed as one kind of low-noise, regulated, -2V GaAsFET bias that can be used in (1)cellular phones; (2)GaAsFET power amplifier modules; (3)personal communicators, PDAs; (4)wireless data loggers; (5)continuously adjustable GaAsFET bias; (6)LCD-bias contrast control; (7)regulated negative power supplies. This device offers both a -2V preset output and a -0.5V to -9.4V adjustable output, and also achieve less than 1mVp-p typical output ripple.

Features of the MAX844C/D are:(1)fixed -2V or adjustable -0.5V to -9.4V output at 4mA; (2)2.5V to 10V input voltage range; (3)operate with small capacitors (as low as 0.22F); (4)1mVp-p output voltage ripple; (5)charge-pump switching frequency: 100kHz in normal operation and 20kHz in shutdown mode (MAX844); (6)1A max logic-level shutdown over temperature; (7)small 8-pin SO package.

The absolute maximum ratings of the MAX844C/D can be summarized as:(1)Supply Voltage, VIN to GND: -0.3 V to 10.5 V;(2)VNEGOUT to GND: -10.5 V to 0.3 V;(3)VIN to VNEGOUT: -0.3 V to 21 V;(4)VOUT to GND: VNEGOUT to 0.3 V;(5)V SHDN to GND: -0.3 V to (VIN + 0.3 V);(6)Lead Temperature (soldering, 10sec): +300°C;(7)Storage Temperature Range: -65°C to +150°C;(8)Operating Temperature Range: -40°C to +85°C.

The electrical characteristics of this MAX844C/D can be summarized as:(1)FB Voltage: -0.516 to -0.484 V;(2)FB Leakage Current: ±1 to ±100 nA;(3)CONT Leakage Current: ±1 to ±100 nA;(4)Supply Current: 750 to 1300 A;(5)Input High Voltage: 2.2 V;(6)Input Low Voltage: 0.35 V;(7)Input Current: -1 to 1 A;(8)Input Capacitance: 10 pF. If you want to know more information about MAX844C/D, please download the datasheet in www.seekic.com or www.chinaicmart.com .