sc4524d

Manufacturer Part Numbersc4524d
Description18v 2a Step-down Switching Regulator
ManufacturerSemtech Corporation
sc4524d datasheet
 


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POWER MANAGEMENT
Features
Wide input range: 3V to 18V
2A Output Current
200kHz to 2MHz Programmable Frequency
Precision 1V Feedback Voltage
Peak Current-Mode Control
Cycle-by-Cycle Current Limiting
Hiccup Overload Protection with Frequency Foldback
Soft-Start and Enable
Thermal Shutdown
Thermally Enhanced 8-pin SOIC Package
Fully RoHS and WEEE compliant
Applications
XDSL and Cable Modems
Set Top Boxes
Point of Load Applications
CPE Equipment
DSP Power Supplies
LCD and Plasma TVs
Typical Application Circuit
10V – 16V
V
IN
C4
2.2 F
BST
IN
SW
SC4524D
SS/EN
FB
COMP
ROSC
GND
C7
R5
R7
10nF
C8
30.1k
15.8k
10pF
C5
1nF
L1: Wurth 744 778 9006
C2: Murata GRM31CR60J226K
C4: Murata GRM31CR61E225K
Figure 1. 1MHz 10V-16V to 5V/2A Step-down Converter
Dec. 9, 2010
18V 2A Step-Down Switching Regulator
Description
The SC4524D is a constant frequency peak current-mode
step-down switching regulator capable of producing 2A
output current from an input ranging from 3V to 18V. The
switching frequency of the SC4524D is programmable
up to 2MHz, allowing the use of small inductors and
ceramic capacitors for miniaturization, and high input/
output conversion ratio. The SC4524D is suitable for
next generation XDSL modems, high-definition TVs and
various point of load applications.
Peak current-mode PWM control employed in the
SC4524D achieves fast transient response with simple loop
compensation. Cycle-by-cycle current limiting and hiccup
overload protection reduces power dissipation during
output overload. Soft-start function reduces input start-
up current and prevents the output from overshooting
during power-up.
The SC4524D is available in SOIC-8 EDP package.
SS270 REV 4
D1
90
85
1N4148
C1
0.33 F
80
L1
OUT
75
6.8 H
5V/2A
R4
70
102k
65
60
55
D2
R6
C2
20BQ030
25.5k
22 F
50
45
40
SC4524D
Efficiency
V
= 12V
IN
0
0.5
1
1.5
2
Load Current (A)