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SC4503 Datasheet(PDF) 18 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) 18 Page - Semtech Corporation

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 2007 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC4503
Typical Application Circuits
2.6 - 4.2V
VOUT
C1
1
µF
10BQ015
D1
C2
10
µF
R2
249k
R1
412k
3.3V, 0.45A
L1
3.3
µH
C5
2.2
µF
L2
3.3
µH
SC4503
3
1
5
2
GND
SHDN/SS
IN
SW
FB
4
R3
8.06k
C3
C4
15pF
1-CELL
LI-ION
0.22
µF
Efficiency vs Load Current
30
35
40
45
50
55
60
65
70
75
80
85
0.001
0.010
0.100
1.000
Load Current (A)
VOUT = 3.3V
VIN = 3.6V
VIN = 2.6V
VIN = 4.2V
VIN = 3.6V
L1 and L2: Coiltronics DRQ73-3R3
C1: Murata GRM188R61A105K
C2: Murata GRM21BR60J106K
C5: Murata GRM188R61A225K
Figure 12(b). Efficiency vs Load Current
Upper Trace : Output Voltage, AC Coupled, 0.2V/div
Lower Trace : Input Inductor Current, 0.2A/div
Load Transient Response of the Circuit
in Figure 12(a). I
OUT is switched between
100mA and 500mA
Figure 12(c).
40
µs/div
Figure 12(a). Single Li-ion Cell to 3.3V SEPIC Converter.



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