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SC4503 Datasheet(PDF) 16 Page - Semtech Corporation

Part # SC4503
Description  1.3MHz Step-Up Switching Regulator with 1.4A Switch
PDF  22 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4503 Datasheet(HTML) 16 Page - Semtech Corporation

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 2007 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC4503
Typical Application Circuits
Efficiency vs Load Current
50
55
60
65
70
75
80
85
90
95
0.001
0.010
0.100
1.000
Load Current (A)
VOUT = 12V
1.3MHz
Figure 10(b). Efficiency vs Load Current
Upper Trace : Output Voltage, AC Coupled, 0.5V/div
Lower Trace : Input Inductor Current, 0.5A/div
Load Transient Response of the Circuit
in Figure 10(a). I
OUT is switched between
90mA and 280mA
Figure 10(c).
40
µs/div
2.2
µF
C1
3.3V
VIN
VOUT
SC4503
3
1
5
2
GND
SHDN/SS
IN
SW
FB
4
10BQ015
D1
L1
C2
4.7
µF
R2
100k
R1
866k
12V
2.7
µH
R3
15k
C3
56nF
C4
2.2pF
Figure 10(a). 3.3V to 12V Boost Converter with Soft-start
L1: Coiltronics LD1
C1: Murata GRM188R61A225K
C2: Murata GRM21BR61C475K



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