L4972A Datasheet PDF - ST Microelectronics

The L4972A is a step-down monolithic power Switching Regulator delivering 2A 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 L4972 include reset and power fail for microprocessors, feed forward line regulation, soft-start, limiting current and thermal protection. Efficient operation at switching frequency up to 200kHz allows reduction in the size and cost of external filter component.

● PWM latch for single pulse per period

● Undervoltage lockout with hysteretic turn-on

● Very high efficiency

● Continuous mode operation

● Thermal shutdown

● Reset and power-fail functions

● Internal current limiting

● Input/output sync pin

● Internal feed-forward line regulation

● Precise 5.1V ±2% on chip reference

● 0 to 90% duty cycle range