SC4525DEVB View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC4525DEVB' PDF : 21 Pages View PDF
SC4525D
POWER MANAGEMENT
18V, 3A, 350kHz Step-Down
Switching Regulator
Features
Description
Input range: 3V to 18V
The SC4525D is a 350kHz constant frequency peak
3A Output Current
current-mode step-down switching regulator capable of
350kHz Fixed Switching Frequency
producing 3A output current from an input ranging from
Precision 1V Feedback Voltage
3V to 18V. The SC4525D is suitable for next generation
Peak Current-Mode Control
XDSL modems, high-definition TVs and various point of
Cycle-by-Cycle Current Limiting
load applications.
Hiccup Overload Protection with Frequency Foldback
Soft-Start and Enable
Peak current-mode PWM control employed in the
Thermal Shutdown
SC4525D achieves fast transient response with simple loop
Thermally Enhanced 8-pin SOIC Package
compensation. Cycle-by-cycle current limiting and hiccup
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
XDSL and Cable Modems
during power-up.
The SC4525D is available in SOIC-8 EDP package.
12
Set Top Boxes
Point of Load Applications
CPE Equipment
DSP Power Supplies
LCD and Plasma TVs
Fig.1b: 350kHz 10-16V to 5V/3A Step-Down Converter (Front Page Efficien
Typical Application Circuit
SC4525A
VIN
10 V– 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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