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PDF SC4520 Data sheet ( Hoja de datos )
| Número de pieza | SC4520 | |
| Descripción | 3A Step-Down Switching Regulator | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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SC4520
3A Step-Down Switching Regulator with
Adjustable Switching Frequency
POWER MANAGEMENT
Description
Features
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
www.DatamShaekete4sU.ctohme this device an excellent choice for portable
applications where conserving battery life is of prime
concern.
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
VIN
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
VOUT
R1
C2
R2
Revision: December 13, 2006
1
www.semtech.com
1 page  
POWER MANAGEMENT
Block Diagram
SC4520
+
+
SLOPE
Is
+
ISEN
IN
40m
www.DataSheet4U.com
COMP
FB
EN
SFYSNECT
-
EA
+
PWM
SQ
R
BST
POWER
TRANSISTOR
1V
REFERENCE UVLO
OSCILLATOR
0.7V
SLOPE
SLOPE COMP
FREQUENCY
CLK
Is
SOFT START
HICCUP
OL
FB
SW
GND
Typical Characteristic - OCP Limit
7
6.5
6
5.5
5
4.5
4
3.5
3
2.5
2
0
SC4519H OCP Limit vs Duty Cycle
Rosc = 0
ILIM @-40C
ILIM @25C
ILIM @125C
20 40 60 80 100
Duty Cycle (%)
2006 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Application Information (Cont.)
Design Example: 16V to 5V at 2A
SC4520
VIN =16V
C3
10u
www.DataSheet4U.com
4.75k
R4
Rosc=0
2 IN
SW 3
5 EN SC4520 FB 6
8
FSET
7
COMP
C5
180p
C1
0.22u
D3
L1
8.2uH
R1
52.3k
Vo=5V
C2
10u
C4
3.3n
R3
3.4k
D2
R2
10k
Bill of Materials
Item
Qty
Reference
Value
1 1 C1
0.22uF, 25V, 0805, X7R
2 2 C2, C3
10u, 1210, X5R, 25V
3 1 C4
3.3n, 0805, X7R, 25V
4 1 C5
180pF
5 1 D1
1N4148WS, SOD-323
6 1 D2
SS33
7 1 L1
8.2uH
8 1 R1
52.3K
9 1 R2
10k
10 1 R3
3.4k
11 1 R4
4.75k
12 1 Rosc
0
13 1 U1
SC4520
Unless specified, all resistors have 1% precision with 0603 package.
Resistors are +/-1% and all capacitors are +/-20%
Part No./Manufacturer
Vishay
Panasonic
Vishay
Fairchild P/N: SS33
COOPER P/N:DR125-8R2
Semtech
2006 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SC4520.PDF ] | |
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