L4972A Datasheet, PDF (1/23 Pages) STMicroelectronics – 2A SWITCHINGREGULATOR

L4972A
®
L4972AD
. 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 HYS-
TERETIC TURN-ON
. PWM LATCH FOR SINGLE PULSE PER PE-
RIOD
. VERY HIGH EFFICIENCY
. SWITCHING FREQUENCY UP TO 200KHz
. THERMAL SHUTDOWN
. CONTINUOUS MODE OPERATION
DESCRIPTION
The L4972Aisa stepdownmonolithicpower switch-
ing regulatordelivering 2A at a voltagevariable 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
2A SWITCHING REGULATOR
MULTIPOWER BCD TECHNOLOGY
POW ERD IP
(16 + 2 + 2)
SO20
ORDERING NUMBERS : L4972A (Powerdip)
L4972AD (SO20)
the L4972A include reset and power fail for micro-
processors, feed forward line regulation, soft start,
limiting current and thermal protection. The device
is mountedin a Powerdip16 + 2 + 2 and SO20large
plastic packages and requires few external compo-
nents. Efficient operation at switching frequencies
up to 200KHz allows reduction in the size and cost
of external filter component.
June 2000
1/23
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.