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DESCRIPTION

The ST777/778/779 are dc-dc converters that step-up from low voltage inputs requiring only three external components, an inductor (typically 22μH) and two capacitors. The device include a Sinchronous Rectifier that eliminates the need for an external catch diode, and allows regulation even when the input is greater than the output.

Unlike others step-up DC-DC converters the ST777/778/779’s Sinchronous Rectifier turns off in the shutdown mode, fully disconnecting the output from the source. This eliminates the current drain associated with conventional step-up converters when off or in shutdown. Supply current is 270μA under no load and only 20μA in stand by mode.

■ 1V TO 6V INPUT GUARANTEES START-UP UNDER LOAD

■ MAXIMUM OUTPUT CURRENT OF 300mA

(778 OR 779 ADJUSTED TO 3V)

■ LOAD FULLY DISCONNECTED IN SHUTDOWN

■ TYPICAL EFFICIENCY OF 82

■ INTERNAL 1A POWER SWITCH AND SYNCHRONOUS RECTIFIER

■ ADJUSTABLE CURRENT LIMIT ALLOWS LOW-COST INDUCTORS

■ SUPPLY CURRENT OF 270μA (NO LOAD)

■ SHUTDOWN SUPPLY CURRENT 20μA

■ PACKAGE AVAILABLE: DIP-8 AND SO-8