MAX778MJA

The MAX778MJA is pulse-skipping,DC-DC converters that step-up from low-voltage inputs (1V,guaranteed).The MAX778MJA require only three external components an inductor(typically 22H),and two capacitors.The MAX778MJA generates pin-selectable voltages of 3.0V or 3.3V.

Features of the MAX778MJA are:(1)1V to 6.2V input guaranteed start-up under load;(2)up to 240mA outputs;(3)85% typical efficiency;(4)also regulates when input voltage is above the output voltage;(5)internal 1A power switch;(6)adjustable current-limit;(7)internal 1A active rectifier with input-to-load disconnect in shutdown;(8)220A quiescent supply current;(9)20A shutdown supply current;(10)3V/3.3V,5V,and adjustable output-voltage versions.Applications of the MAX778MJA are:(1)single battery-cell(1V),step-up;(2)voltage conversion;(3)efficient,high-power step-up regulation from low input voltages;(4)pagers;(5)protable instruments and handy-terminals;(6)laptop and palmtop computers.

The electrical characteristics of the MAX778MJA can be summarized as:(1):the parameter is output voltage,the Min is 3.17,the Typ is 3.30,the Max is 3.43,the unit is V;(2):the parameter is efficiency,the Typ is 86,the unit is %;(3):the parameter is no-load supply current,the Typ is 220,the Max is 310,the unit is A;(4):the parameter is shutdown supply current,the Min is 0,the Typ is 20,the Max is 30,the unit is A;(5):the parameter is output current in shutdown,the Typ is 10,the Max is 20,the unit is A;(6):the parameter is reverse leakage current into LX,the Typ is 0.1,the Max is 3.0,the unit is A;(7):the parameter is operating input voltage 3V/3.3V=0V TA=25,the rating is 1.0 to 6.2,the unit is V;(8):the parameter is operating input voltage 3V/3.3V=open TA=25,the rating is 1.0 to 6.2,the unit is V;(9):the parameter is error comparator trip point,the Min is 0.195,the Typ is 0.200,the Max is 0.205,the unit is V.