SC4503EVB SEMTECH [Semtech Corporation], SC4503EVB Datasheet - Page 17

• Manufacturer Part Number: SC4503EVB
• Description: 1.3MHz Step-Up Switching Regulator with 1.4A Switch
• Manufacturer: SEMTECH [Semtech Corporation]

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