SC4503EVB View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC4503EVB' PDF : 22 Pages View PDF
POWER MANAGEMENT
Typical Application Circuits
SC4503
2.6 - 4.2V
L1
D1
1-CELL
LI-ION
OFF
< 0.4V
C1
4.7µF
3.3V
ON
R3
15k
4
1.5µH
10BQ015
5
1
IN
SW
SC4503
SHDN/SS
FB 3
C3
56nF
GND
2
VOUT
5V
C4
R1
10pF 187k
C2
10µF
R2
60.4k
L1: TDK VLF4012AT
C1: Murata GRM188R60J475K
C2: Murata GRM21BR60J106K
Efficiency vs Load Current
95
90
85 VIN = 4.2V
80
75
VIN = 3.6V
VIN = 2.6V
70
65
60
55
50
0.001
VOUT = 5V
1.3MHz
0.010
0.100
Load Current (A)
1.000
Figure 11(a). Single Li-ion Cell to 5V Boost Converter
Figure 11(b). Efficiency of the Li-ion Cell to 5V
Boost Converter
VIN = 2.6V
VIN = 4.2V
40µs/div
Upper Trace : Output Voltage, AC Coupled, 0.2V/div
Lower Trace : Inductor Current, 0.5A/div
40µs/div
Upper Trace : Output Voltage, AC Coupled, 0.2V/div
Lower Trace : Inductor Current, 0.5A/div
Figure 11(c). Load Transient Response. IOUT is switched Figure 11(d). Load Transient Response. IOUT is switched
between 0.1A and 0.5A
between 0.15A and 0.9A
2007 Semtech Corp.
17
www.semtech.com
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