SC4503 Semtech Corporation, SC4503 Datasheet - Page 16

• Manufacturer Part Number: SC4503
• Description: 1.3MHz Step-Up Switching Regulator
• Manufacturer: Semtech Corporation

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 2007 Semtech Corp.
POWER MANAGEMENT
Typical Application Circuits
Figure 10(b). Effi ciency vs Load Current
95
90
85
80
75
70
65
60
55
50
0.001
1.3MHz
Efficiency vs Load Current
0.010
Load Current (A)
Figure 10(a). 3.3V to 12V Boost Converter with Soft-start
3.3V
VIN
0.100
V
C1
2.2µF
OUT
= 12V
15k
R3
C3
56nF
L1: Coiltronics LD1
C1: Murata GRM188R61A225K
C2: Murata GRM21BR61C475K
1.000
4
SHDN/SS
IN
5
SC4503
2.7µH
GND
L1
2
1
SW
FB
16
3
10BQ015
Figure 10(c).
Upper Trace : Output Voltage, AC Coupled, 0.5V/div
Lower Trace : Input Inductor Current, 0.5A/div
D1
C4
2.2pF
Load Transient Response of the Circuit
in Figure 10(a). I
90mA and 280mA
100k
R1
866k
R2
VOUT
40µs/div
C2
4.7µF
12V
OUT
is switched between
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SC4503