600kHz, 3A Step-Down
Switching Regulator
POWER MANAGEMENT
Description
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.
SC4519H
Features
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
Applications
XDSL modems
CPE equipment
DC-DC point of load applications
Portable equipment
Typical Application Circuit
D1
1
VIN
Enable
C3
2
5
8
BST
IN
SW
3
6
7
C1
L1
VOUT
R1
SC4519H
EN
SYNC
GND
4
FB
COMP
D2
R2
C2
C4
R3
Revision: September 11, 2007
1
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