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SC4501 датащи(PDF) 16 Page - Semtech Corporation

номер детали SC4501
подробное описание детали  2Amp, 2MHz Step-Up Switching Regulator with Soft-Start
PDF  21 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4501 датащи(HTML) 16 Page - Semtech Corporation

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© 2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC4501
Typical Application Circuits
Figure 11(b). Efficiency of the Single Li-ion Cell to 5V Boost
Converter in Figure 11(a).
Efficiency
50
55
60
65
70
75
80
85
90
95
0.001
0.010
0.100
1.000
Load Current (A)
VOUT = 5V
VIN = 2.6V
1.2MHz
VIN = 3.6V
VIN = 4.2V
5V, 0.8A
C1
2.2
µF
VOUT
ON
OFF
C3
C4
10BQ015
R3
D1
L1
1.8
µH
C2
10
µF
47nF
1nF
R2
100K
17.4K
SC4501
2
3
1
5
6
4
GND
SHDN
SS
IN
SW
FB
ROSC
COMP
8
7
2.6 - 4.2V
1-CELL
LI-ION
R1
301K
R4
10.7K
Figure 11(a). 1.2 MHz All Ceramic Capacitor Single Li-ion Cell
L1: Sumida CR43
to 5V Boost Converter.
Lower Trace : Inductor Current, 0.5A/div
Upper Trace : Output Voltage, AC Coupled, 0.5V/div
40
µs/div
Figure 11(c). Load Transient Response of the Circuit in Figure
11(a). I
LOAD is switched between 0.2A and 0.7A at
1A/
µs.
V
IN=2.6V



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