SC4503EVB View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC4503EVB' PDF : 22 Pages View PDF
SC4503
POWER MANAGEMENT
Typical Application Circuits
2.6 - 4.2V
1-CELL
LI-ION
L1
C5
3.3µH
2.2µF
5
R3
8.06k
IN
1
SW
C1
SC4503
1µF
4 SHDN/SS
FB 3
C3
0.22µF
GND
2
D1
10BQ015
L2
3.3µH
VOUT
3.3V, 0.45A
C4 R1
15pF 412k
C2
10µF
R2
249k
L1 and L2: Coiltronics DRQ73-3R3
C1: Murata GRM188R61A105K
C2: Murata GRM21BR60J106K
C5: Murata GRM188R61A225K
Figure 12(a). Single Li-ion Cell to 3.3V SEPIC Converter.
Efficiency vs Load Current
85
80 VOUT = 3.3V
75
70
65
60
55
50
45
VIN = 2.6V
40
VIN = 3.6V
35
30
0.001
0.010
VIN = 4.2V
0.100
1.000
Load Current (A)
VIN = 3.6V
40µs/div
Upper Trace : Output Voltage, AC Coupled, 0.2V/div
Lower Trace : Input Inductor Current, 0.2A/div
Figure 12(b). Efficiency vs Load Current
2007 Semtech Corp.
Figure 12(c). Load Transient Response of the Circuit
in Figure 12(a). IOUT is switched between
100mA and 500mA
18
www.semtech.com
Share Link: 
