文档介绍：® L4975A
5A SWITCHING REGULATOR
5A OUTPUT CURRENT
TO 40V OUTPUT VOLTAGE RANGE MULTIPOWER BCD TECHNOLOGY
0 TO 90% DUTY CYCLE RANGE
INTERNAL FEED-FORWARD LINE REGULA-
TION
INTERNAL CURRENT LIMITING
PRECISE ± 2% ON CHIP REFERENCE
RESET AND POWER FAIL FUNCTIONS
SOFT START
INPUT/OUTPUT SYNC PIN Multiwatt15V
UNDER VOLTAGE LOCK OUT WITH HYS- ORDERING NUMBER: L4975A
TERETIC TURN-ON
PWM LATCH FOR SINGLE PULSE PER PE-
RIOD
Realized with BCD mixed technology, the device
VERY HIGH EFFICIENCY
uses a DMOS output transistor to obtain very high
SWITCHING FREQUENCY UP TO 500KHz efficiency and very fast switching times. Features
THERMAL SHUTDOWN of the L4975A include reset and power fail for mi-
CONTINUOUS MODE OPERATION croprocessors, feed forward line regulation, soft
start, limiting current and thermal protection. The
device is mounted in a 15-lead multiwatt plastic
DESCRIPTION power package and requires few external compo-
The L4975A is a stepdown monolithic power nents. Efficient operation at switching frequencies
switching regulator delivering 5A at a voltage vari- up to 500KHz allows reduction in the size and
able from to 40V. cost of external filter components.
BLOCK DIAGRAM
June 2000 1/21
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
芯天下--/
L4975A