POWER MANAGEMENT
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SC4519H
600kHz, 3A Step-Down
Switching Regulator
Description
Features
Typical Application Circuit
Applications
Revision: December 12, 2007
The SC4519H is a current mode switching regulator with
an integrated switch, operating at 600kHz with separate
sync and enable functions. The integrated switch allows
for cost effective low power solutions (peak switch current
3 amps). The sync function allows customers to
synchronize to a faster clock in order to avoid frequency
beating in noise sensitive applications. High frequency
of operation allows for very small passive components.
Current mode operation allows for fast dynamic response
and instantaneous duty cycle adjustment as the input
varies (ideal for CPE applications where the input is a
wall plug power).
The low shutdown current makes it ideal for portable
applications where battery life is important.
The SC4519H is a 600kHz switching regulator
synchronizable to a faster frequency from 750kHz to
1.2MHz.
Integrated 3 Amp switch
600kHz frequency of operation
Current mode controller
Synchronizable to higher frequency up to 1.2MHz
Precision enable threshold
SO-8 EDP package. Lead free product, fully WEEE
and RoHS compliant
XDSL modems
CPE equipment
DC-DC point of load applications
Portable equipment
C1
VOUT
D2
D1
R3
C2
L1
Enable
BST
1
IN
2
SW
3
GND
4
EN
5
FB
6
COMP
7
SYNC
8
VIN
C4
C3
SC4519H
R1
R2
