SC2620 Semtech Corporation, SC2620 Datasheet - Page 25

• Manufacturer Part Number: SC2620
• Description: 30V Step-down Regulator
• Manufacturer: Semtech Corporation

POWER MANAGEMENT
Typical Application Circuits
2008 Semtech Corp.
Figure 18(a). 350kHz 12V-30V Input to 5V and 1.5V Step-down Converter. Notice that Channel 2 is bootstrapped
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90
85
80
75
70
65
60
55
50
45
40
0
from OUT1. Channel 2 will be held off if OUT1 voltage is below 90% of its set value.
V
V
0.5
OUT1
OUT2
Load Current (A)
= 5V
= 1.5V
Efficiency
11.3k
0.1 F
0.1 F
C10
12.4k
R5
C7
R7
68pF
47pF
1
C6
C9
2.2nF
82.5k
2.7nF
C5
R9
C8
C1 : Murat a GRM21BR60J226M
C3 : Murat a GRM31CR60J 476M
C15: Murata GRM32DF51H106Z
Figure 18(b). Switching Waveforms. I
V
1.5
IN
SS1
ROSC
SS2
COMP1
COMP2
FB2
PGOOD1
= 12V
SC2620
FB1
GND
BOOST1
BOOST2
2
PVIN
SW1
SW2
VIN
12-30V
1N4148
D4
10
2 s/div
R10
L1 : Coiltronic DR74
L2 : Coiltronic DR73
0.1 F
C16
25
C15
10 F
C4
0.1 F
0.1 F
C2
1N4148
D1
UPS140
D2
UPS140
D3
22 H
L1
C H 2
V
10 H
IN
L2
OUT1
90
85
80
75
70
65
60
55
50
45
40
C H 1
= 30V
C1
22 F
0
= I
OUT2
R1
15.0k
60.4k
R2
C3
47 F
= 1A.
0.5
CH1 : SW1 Voltage, 10V/div
CH2 : SW2 Voltage, 10V/div
5.76k
11.5k
R3
R4
Load Current (A)
C11
47pF
C12
47pF
V
V
OUT1
OUT2
Efficiency
= 5V
= 1.5V
1
OUT1
5V/2A
1.5V/2A
OUT2
1.5
V
IN
= 24V
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SC2620
2