SC4502H Semtech Corporation, SC4502H Datasheet - Page 15

• Manufacturer Part Number: SC4502H
• Description: 1.4 Amp, 2 Mhz Step-up Switching Regulator With Soft-start | Semtech
• Manufacturer: Semtech Corporation

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