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| SC4525D Datasheet, PDF (1/21 Pages) Semtech Corporation – 18V, 3A, 350kHz Step-Down Switching Regulator | |||
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SC4525D
POWER MANAGEMENT
18V, 3A, 350kHz Step-Down
Switching Regulator
Features
Description
ï® Input range: 3V to 18V
The SC4525D is a 350kHz constant frequency peak
ï® 3A Output Current
current-mode step-down switching regulator capable of
ï® 350kHz Fixed Switching Frequency
producing 3A output current from an input ranging from
ï® Precision 1V Feedback Voltage
3V to 18V. The SC4525D is suitable for next generation
ï® Peak Current-Mode Control
XDSL modems, high-definition TVs and various point of
ï® Cycle-by-Cycle Current Limiting
load applications.
ï® Hiccup Overload Protection with Frequency Foldback
ï® Soft-Start and Enable
Peak current-mode PWM control employed in the
ï® Thermal Shutdown
SC4525D achieves fast transient response with simple loop
ï® Thermally Enhanced 8-pin SOIC Package
compensation. Cycle-by-cycle current limiting and hiccup
ï® Fully RoHS and WEEE compliant
overload protection reduces power dissipation during
output overload. Soft-start function reduces input start-
up current and prevents the output from overshooting
Applications
ï® XDSL and Cable Modems
during power-up.
The SC4525D is available in SOIC-8 EDP package.
12
ï® Set Top Boxes
ï® Point of Load Applications
ï® CPE Equipment
ï® DSP Power Supplies
ï® LCD and Plasma TVs
Fig.1b: 350kHz 10-16V to 5V/3A Step-Down Converter (Front Page Efficien
Typical Application Circuit
SC4525A
VIN
10 Vâ 16V
C4
10mF
IN
BST
SW
SS/EN SC4525D
COMP
RSET
FB
GND
C7
22 nF
C8
47pF
R7
11.5k
C5
2.2 nF
R5
60.4 k
D1
1N 4148
C1
0. 33 mF
L1
10 mH
R4
33.2k
OUT
5V/3A
D2
20BQ030
R6
8. 25k
C2
47m F
L1 : Coiltronics CD1- 100
C2 : Murata GRM 31CR60J 476 M
C4 : Murata GRM 31CR61E 106 K
Efficiency
90
85
80
VIN =12V
75
70
65
60
55
50
45
40
0 0.5 1 1.5 2 2.5 3
Load Current (A)
Figure 1. 350kHz 10V -16V to 5V/3A Step-down Converter
Jan. 13, 2011
Efficiency of the 1MHz 10V-28V to 5V/3A Step-Down Converter (Front Pag
www.semtech.com
Fig.1a : 350 kHz10-V 16 V to5V/3 A Ste- p Down Convert(er Front Page Schema)tic
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