L4972A

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