SC4520 Datasheet, PDF (1/12 Pages) Semtech Corporation – 3A Step-Down Switching Regulator with Adjustable Switching Frequency

SC4520
3A Step-Down Switching Regulator with
Adjustable Switching Frequency
POWER MANAGEMENT
Description
The SC4520 is a current mode switching regulator with
an integrated switch and an adjustable frequency with
enable function. The integrated switch allows for cost-
effective, low power solutions with a peak switch current
of 3 amps. An adjustable high frequency of 100kHz to
600kHz provides for fast dynamic response and
instantaneous duty cycle adjustment as the input varies,
making the device ideal for CPE applications where the
input is a wall plug power. Low shutdown current also
makes the this device an excellent choice for portable
applications where conserving battery life is of prime
concern.
Features
‹ Wide operating voltage range: 4.4V to 24V
‹ Integrated 3 Amp switch
‹ 100kHz to 600kHz adjustable frequency operation
‹ Current mode control
‹ 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
‹ Digtial consumer electronics
Typical Application Circuit
D1
V_IN
Enable
C3
2
IN
1
BST
3
SW
5
EN
SC4520
6
FB
8
FSET
Rosc
GND
4
7
COMP
C4
R3
C1
L1
D2
V_OUT
R1
C2
R2
Revision: December 13, 2006
1
www.semtech.com