L4974A| Datasheet

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L4974A
3.5A SWITCHING REGULATOR

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3.5A OUTPUT CURRENT 5.1V TO 40V OUTPUT VOLTAGE RANGE 0 TO 90% DUTY CYCLE RANGE INTERNAL FEED-FORWARD LINE REG. INTERNAL CURRENT LIMITING PRECISE 5.1V 2% ON CHIP REFERENCE RESET AND POWER FAIL FUNCTIONS 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 200KHz THERMAL SHUTDOWN CONTINUOUS MODE OPERATION

MULTIPOWER BCD TECHNOLOGY

POWERDIP (16 + 2 + 2) ORDERING NUMBER : L4974A

DESCRIPTION The L4974A is a stepdown monolithic power switching regulator delivering 3.5A at a voltage variable from 5.1 to 40V. Realized with BCD mixed technology, the device uses a DMOS output transistor to obtain very high efficiency and very fast switching times. Features of BLOCK DIAGRAM

the L4974A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a Powerdip 16 + 2 + 2 plastic package and requires few external components. Efficient operation at switching frequencies up to 200KHz allows reduction in the size and cost of external filter component.

June 2000

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This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.