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L4977A

STMicroelectronics
Part Number L4977A
Manufacturer STMicroelectronics
Description 7A SWITCHING REGULATOR
Published Mar 22, 2005
Detailed Description ® L4977A 7A SWITCHING REGULATOR 7A OUTPUT CURRENT 5.1V TO 40V OUTPUT VOLTAGE RANGE 0 TO 90% DUTY CYCLE RANGE INTERNAL ...
Datasheet PDF File L4977A PDF File

L4977A
L4977A

Overview
® L4977A 7A SWITCHING REGULATOR 7A OUTPUT CURRENT 5.
1V TO 40V OUTPUT VOLTAGE RANGE 0 TO 90% DUTY CYCLE RANGE INTERNAL FEED-FORWARD LINE REGULATION INTERNAL CURRENT LIMITING PRECISE 5.
1V ± 2% ON CHIP REFERENCE RESET AND POWER FAIL FUNCTIONS SOFT START INPUT/OUTPUT SYNC PIN UNDER VOLTAGE LOCK OUT WITH HYSTERETIC TURN-ON PWM LATCH FOR SINGLE PULSE PER PERIOD VERY HIGH EFFICIENCY SWITCHING FREQUENCY UP TO 500KHz THERMAL SHUTDOWN CONTINUOUS MODE OPERATION DESCRIPTION The L4977A is a stepdown monolithic power switching regulator delivering 7A at a voltage variable from 5.
1 to 40V.
BLOCK DIAGRAM MULTIPOWER BCD TECHNOLOGY Multiwatt15V ORDERING NUMBER: L4977A Realized with BCD mixed technology, the device uses a DMOS output transistor to obtain very high efficiency and very fast switching times.
Features of the L4977A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection.
The device is mounted in a 15-lead multiw...


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