SC4524C Ver la hoja de datos (PDF) - Semtech Corporation
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SC4524C Datasheet PDF : 22 Pages
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SC4524C
28V 2A Step-Down Switching Regulator
POWER MANAGEMENT
Features
Wide input range: 3V to 28V
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
Automotive Car Audio
Description
The SC4524C is a constant frequency peak current-mode
step-down switching regulator capable of producing 2A
output current from an input ranging from 3V to 28V. The
switching frequency of the SC4524C can be programmed
up to 2MHz for component miniaturization or it can be
set at lower frequencies to accommodate high step-down
ratios. The SC4524C is suitable for next generation XDSL
modems, high-definition TVs and various point of load
applications.
Peak current-mode PWM control employed in the
SC4524C 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 SC4524C is available in SOIC-8 EDP package.
Typical Application Circuit
SS270 REV 4
VIN
10V – 28V
C4
2.2PF
IN
BST
SW
SS/EN SC4524C
COMP
ROSC
FB
GND
C7
10nF
C8
22pF
R7
28.0k
C5
2.2nF
R5
15.8k
D1
1N4148
C1
0.33PF
L1
8.2PH
R4
42.2k
OUT
5V/2A
D2
20BQ030
R6
10.5k
C2
22PF
L1: Coiltronics DR73-8R2
C2: Murata GRM31CR60J226K
C4: Murata GRM31CR71H225K
90
85
80
75
70
65
60
55
50
45
40
0
Efficiency
VIN = 12V
VIN = 24V
0.5
1
1.5
2
Load Current (A)
Revision 5.0
Figure 1. 1MHz 10V-28V to 5V/2A Step-down Converter
© 2011 Semtech Corporation
Fig.1 Efficiency of the 1MHz 10V-28V to 5V/2A Step-Do
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