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L4974 Datasheet

  • L4974

  • 3.5A SWITCHING REGULATOR

  • 329.08KB

  • 22頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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L4974A
3.5A SWITCHING REGULATOR
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3.5A 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
鹵
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
MULTIPOWER BCD TECHNOLOGY
POWERDIP
(16 + 2 + 2)
ORDERING NUMBER :
L4974A
DESCRIPTION
The L4974Aisa stepdownmonolithicpower switch-
ing regulator delivering 3.5A 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
BLOCK DIAGRAM
the L4974A 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 plastic package
and requires few external components. Efficient
operation at switching frequencies up to 200KHz
allows reductionin the size and cost of externalfilter
component.
June 2000
1/22
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

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