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SC4502 Datasheet(PDF) 15 Page - Semtech Corporation

Part # SC4502
Description  1.4Amp, 2MHz Step-Up Switching Regulator with Soft-Start
PDF  19 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4502 Datasheet(HTML) 15 Page - Semtech Corporation

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



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