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SC4521 Datenblatt(PDF) 1 Page - Semtech Corporation

Teilenummer SC4521
Bauteilbeschribung  3A Step-Down Switching Regulator with Programmable Soft Start
PDF  18 Pages
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Hersteller  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4521 Datenblatt(HTML) 1 Page - Semtech Corporation

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POWER MANAGEMENT
1
www.semtech.com
SC4521
3A Step-Down Switching Regulator
with Programmable Soft Start
Features
Revision: October 5, 2007
The SC4521 is a current mode switching regulator with
an integrated switch, operating at 600kHz with
programmable soft start and enable functions. The
integrated switch allows for cost effective low power
solutions (peak switch current 3 amps). High frequency
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 SC4521 is an 600kHz switching regulator with a low
pin count.
The SC4521 allows customers to use large capacitive
loads because its programmable soft start limits the dv/
dt of the output at start up.
Wide operating voltage range: 4.4V to 24V
Integrated 3 Amp switch
600kHz frequency of operation
Programmable soft start funchion
Current mode control
Precision enable threshold
SO-8 EDP Lead-free package, fully WEEE and RoHS
compliant
XDSL modems
CPE equipment
DC-DC point of load applications
Portable equipment
Digtial consumer electronics
C1
VOUT
D2
R3
D1
L1
C2
BST
1
IN
2
SW
3
GND
4
EN
5
FB
6
COMP
7
SS
8
Enable
C4
VIN
C3
R2
R1
SC4521
C6
C1
VOUT
D2
R3
D1
L1
C2
BST
1
IN
2
SW
3
GND
4
EN
5
FB
6
COMP
7
SS
8
Enable
C4
VIN
C3
R2
R1
SC4521
C6
Typical Application Circuit
Applications
Description


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