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DESCRIPTION

The L4970A is a stepdown monolithic power switching regulator delivering 10A 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 the L4970A 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 multiwatt plastic power package and requires few external components. Efficient operation at switching frequencies

up to 500KHz allows reduction in the size and cost of external filter components.

10A 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