SC4502 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC4502' PDF : 19 Pages View PDF
POWER MANAGEMENT
Typical Application Circuits
SC4502/SC4502H
2.6 - 4.2V
1-CELL
LI-ION
L1
D1
2.5µH
10BQ015
8
6,7
IN
OFF ON 3 SHDN
SW
FB 2
C1
2.2µF
SC4502
10 SS
COMP 1
C3
47nF
GND
4,5
ROSC
9 R4
7.68K
R3
34.8K
C4
1nF
R1
301K
VOUT
5V, 0.5A
R2
100K
C2
10µF
L1: Sumida CDRH5D28
Efficiency vs Load Current
95
90
1.5MHz
85
80
VIN = 4.2V
75
70
65
VIN = 3.6V
VIN = 2.6V
60
55
VOUT = 5V
50
0.001
0.010
0.100
1.000
Load Current (A)
Figure 10(a). 1.5 MHz All Ceramic Capacitor Single Li-ion Cell
to 5V Boost Converter.
Figure 10(b). Efficiency of the Single Li-ion Cell to 5V Boost
Converter in Figure 10(a).
VIN=2.6V
40µs/div
Upper Trace : Output Voltage, AC Coupled, 0.5V/div
Lower Trace : Inductor Current, 0.5A/div
Figure 10(c). Load Transient Response of the Circuit in Figure .
10(a). ILOAD is switched between 90mA and 0.5A
at 1A/µs.
2005 Semtech Corp.
15
www.semtech.com
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