L4972| Datasheet

L4972, L4972A, L4972AD, L4972AD013TR

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L4972A
2A SWITCHING REGULATOR
1

Features
2A 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

Figure 1. Packages

PowerDIP20 (16+2+2)

SO20

Table 1. Order Codes
Part Number L4972A L4972AD L4972AD013TR Package DIP20 (16+2+20) SO20 SO20 in Tape & Reel

Description

The L4972A is a stepdown monolithic power switching regulator delivering 2A at a voltage variable from 5.1 to 40V. Realized with BCD mixed technology, the device Figure 2. Block Diagram

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. The device is mounted in a Powerdip 16 + 2 + 2 and SO20 large plastic packages and requires few external components. Efficient operation at switching frequencies up to 200KHz allows reduction in the size and cost of external filter component.

May 2005

Rev. 3 1/22