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SC2440AEVB Datasheet(PDF) 24 Page - Semtech Corporation

Part # SC2440AEVB
Description  Dual 30V Step-Down Switching Regulator with 2A Switches
PDF  28 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC2440AEVB Datasheet(HTML) 24 Page - Semtech Corporation

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24
SC2440A
Typical Application Circuits (Continued)
(a) Synchronized 600kHz 24V to 5V and 3.3V Dual Step-down Converter.
The free-running frequency of the regulator is set to 580kHz.
(b) Efficiency
(c) Switching Waveforms. V
IN = 24V, IOUT1 = IOUT2 = 1A.
(d) Start-up Waveforms. V
IN = 24V, IOUT1 = IOUT2 = 0.5A.
Figure 15.
400ns/div
V
SYNC
2V/div
V
SW1
10V/div
V
SW2
10V/div
(c)
4ms/div
V
IN
5V/div
V
OUT1
2V/div
V
OUT2
2V/div
(d)
C9
10pF
C6
10pF
1.1M Hz
C16
0.1mF
Free-running frequency = 580kHz (SS313R2 trimmed part, R9 = 37.4k)
C9
22pF
C15
46.4k
SC2440A
G ND
SS2
IN
SW 1
FB2
RO SC
CO M P2
R7
9.53k
BST1
BST2
SW 2
L1
C2
0.1mF
L2
PG O O D2
SS1
PG O O D1
CO M P1
FB1
C3
D1
20BQ 030
D2
20BQ 030
102k
R9
37.4k
O UT1
5V/1.8A
20k
R4
R3
20k
R2
R1
80.6k
C7
22nF
C10
22nF
C8
1.5nF
R5
14.3k
C5
1nF
D4
1N4148
SYNC
L2: W urth 744 777 910
L1: W urth 744 777 9112
O UT2
3.3V/1.8A
D3
1N4148
VIN
20V-28V
C4
0.1mF
22mF
4.7mF
C1
22mF
12mH
10mH
R8
C1, C3: Murata G RM21BR60J106K
C15: Murata G RM31CR71H475K
102k
R6
C6
22pF
600kHz
Updated 9/25/13
(a)
(b)



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