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ST777ACD Fiches technique(PDF) 1 Page - STMicroelectronics |
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ST777ACD Fiches technique(HTML) 1 Page - STMicroelectronics |
1 / 11 page 1/11 October 2002 s 1V TO 6V INPUT GUARANTEES START-UP UNDER LOAD s MAXIMUM OUTPUT CURRENT OF 300mA (778 OR 779 ADJUSTED TO 3V) s LOAD FULLY DISCONNECTED IN SHUTDOWN s TYPICAL EFFICIENCY OF 82% s INTERNAL 1A POWER SWITCH AND SYNCHRONOUS RECTIFIER s ADJUSTABLE CURRENT LIMIT ALLOWS LOW-COST INDUCTORS s SUPPLY CURRENT OF 270µA (NO LOAD) s SHUTDOWN SUPPLY CURRENT 20µA s PACKAGE AVAILABLE: DIP-8 AND SO-8 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. ST777/778/779 LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER VIN VO 22µH 100µF 100µF RLIM ILIM LX IN OUT PGND SEL AGND 1 2 3 4 5 6 7 8 SHDN 1.25V VREF SHUTDOWN CONTROL DELAY TIMER DELAY TIMER tOFF tON SWITCH DRIVER ACTIVE RECTIFIER RECTIFIER CONTROL 1: N SCHEMATIC DIAGRAM SO-8 DIP-8 |
Numéro de pièce similaire - ST777ACD |
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Description similaire - ST777ACD |
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