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SC4502MLTRT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
16
2005 Semtech Corp.
POWER MANAGEMENT
SC4502/SC4502H
www.semtech.com
3.6 - 6V
4-CELL
VOUT
C1
2.2µF
SC4502
2
3
1
6,7
8
4,5
GND
SHDN
SS
IN
SW
FB
ROSC
COMP
10
9
ON
OFF
R3
R4
10BQ015
D1
C2
10µF
C3
47nF
R2
20K
35.7K
R1
60.4K
5V, 0.5A
7.68K
C4
1.5nF
L1
3.3
µ
H
C6
2.2
µ
F
L2
3.3µH
C6
22pF
Figure 11(a). 1.5 MHz All Ceramic Capacitor 4-Cell to 5V SEPIC Converter.
L1 and L2: Coiltronics DRQ73-3R3
Figure 11(b). Load Transient Response of the Circuit in Figure
Upper Trace : Output Voltage, AC Coupled, 0.5V/div
40µs/div
11(a). I
LOAD
is switched between 150mA and
450mA at 1A/µs.
Lower Trace : Input Inductor Current, 0.2A/div
Lower Trace : Input Inductor Current, 0.2A/div
Figure 11(c). Load Transient Response of the Circuit in Figure
Upper Trace : Output Voltage, AC Coupled, 0.5V/div
40µs/div
11(a). I
LOAD
is switched between 250mA and
700mA at 1A/µs.
V
IN
=3.6V
V
IN
=6V
Typical Application Circuits
17
2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC4502/SC4502H
Figure 12(a). 1.5MHz Triple-Output TFT Power Supply.
D2 - D7 : BAT54S
L1 : Coiltronics SD18-3R3
R6
150K
SC4502
9
L1
3.3V
C1
2.2µF
23V (10mA)
OUT1
2
3
1
6,7
8
4,5
GND
SHDN
SS
IN
SW
FB
ROSC
COMP
10
C3
C4
R3
R4
10BQ015
D1
10µF
47nF
1.5nF
33.2K
R2
R1
C2
49.9K
274K
8V (0.4A)
7.68K
C9
0.1
µ
F
3.3
µ
H
D6
D7
C10
1
µ
F
D2
0.1
µ
F
C5
D3
0.1
µ
F
C6
D4
0.1
µ
F
C7
D5
1
µ
F
C8
OUT2
OUT3
-8V (10m A)
R5
100K
Figure 12(c). TFT Power Supply Start-up Transient as the
SHDN Pin is stepped from 0 to 2V.
2ms/div
CH1 : OUT1 Voltage, 5V/div
CH2 : OUT2 Voltage, 10V/div
CH3 : OUT3 Voltage, 5V/div
CH4 : SHDN Voltage, 2V/div
CH1 : OUT1 Voltage, 5V/div
CH4 : Input Voltage, 2V/div
4ms/div
CH2 : OUT2 Voltage, 10V/div
CH3 : OUT3 Voltage, 5V/div
Figure 12(b). TFT Power Supply V
IN
Start-up Transient.
CH4
CH3
CH2
CH1
CH4
CH3
CH2
CH1
Typical Application Circuits
18
2005 Semtech Corp.
POWER MANAGEMENT
SC4502/SC4502H
www.semtech.com
Typical Application Circuits
C1
2.2
µ
F
14V
VIN
VOUT
SC4502H
2
3
1
6,7
8
4,5
GND
SHDN
SS
IN SW
FB
ROSC
COMP
10
9
ONOFF
C3
SS14
R4
D1
L1
C2
10
µ
F
47nF
R2
649
R1
17.4K
35V
C4
R3
5.11K
1.5nF
Figure 13(a). All Ceramic Capacitor High Voltage Application
f
)zHM(
R
4
K( ΩΩ
Ω
ΩΩ)
L
1
0.18.5110_DB5252-PLHIHu01
4.10110_DB5252-PLHIHu8.6
Figure 13(b). Efficiency of the All Ceramic Capacitor High
Voltage Application
Efficiency at 14V input
50
55
60
65
70
75
80
85
90
0 0.05 0.1 0.15 0.2
Load (A)
Efficiency (%)
1.0MHz 10µH
1.4MHz 6.8µH
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

SC4502MLTRT

Mfr. #:
Buy SC4502MLTRT
Manufacturer:
Semtech
Description:
Switching Voltage Regulators 1.4AMP 2MHZ STEP-UP SW REG
Lifecycle:
New from this manufacturer.
Delivery:
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