Datasheet

PGND
FB1
V
C1
V
BG
SS2
V
C2
FB2
AGND
AGND
PGND
PGND
PGND
SW1
V
IN
CB1
SHDN1
SS1
FSLCT
SHDN2
SW2
LM2717
L2
22 PH
D2
MBRS240
C
OUT2
68 PF
C
OUT1
3.3V OUT1
8V to 20V IN
5V OUT2
PGND
R
FB1
59k
R
FB2
20k
R
F
*Connect C
INA
(pin
23) and C
INB
(pins
14,15) as close as
possible to the V
IN
pins.
68 PF
C
OUT1A
1 PF
ceramic
L1
22 PH
D1
MBRS240
1 PF
C
BOOT1
*C
INA
C
IN
68 PF
U1
C
SS1
C
C1
C
BG
C
C2
C
SS2
AGND
R
C2
R
C1
20k
10k
4.7 nF
1 nF
47 nF
4.7 nF
47 nF
V
IN
V
IN
CB2
AGND
*C
INB
4.7 PF
ceramic
4.7 PF
ceramic
1 PF
C
BOOT2
C
OUT2A
1 PF
ceramic
20.5k
PGND
FB1
V
C1
V
BG
SS2
V
C2
FB2
AGND
AGND
PGND
PGND
PGND
SW1
V
IN
CB1
SHDN1
SS1
FSLCT
SHDN2
SW2
LM2717
L2
22 PH
D2
MBRS240
C
OUT2
68 PF
C
OUT1
3.3V OUT1
17V to 20V IN
15V OUT2
PGND
R
FB1
221k
R
FB2
20k
R
F
*Connect C
INA
(pin
23) and C
INB
(pins
14,15) as close as
possible to the V
IN
pins.
68 PF
C
OUT1A
1 PF
ceramic
L1
22 PH
D1
MBRS240
4.7 nF
C
BOOT1
*C
INA
C
IN
68 PF
U1
C
SS1
C
C1
C
BG
C
C2
C
SS2
AGND
R
C2
R
C1
20k
2k
4.7 nF
1 nF
47 nF
4.7 nF
47 nF
V
IN
V
IN
CB2
AGND
*C
INB
4.7 PF
ceramic
4.7 PF
ceramic
1 PF
C
BOOT2
C
OUT2A
1 PF
ceramic
20.5k
LM2717
www.ti.com SNVS253D –MAY 2005–REVISED MARCH 2013
Figure 12. 15V, 3.3V Output Application
Figure 13. 5V, 3.3V Output Application
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