LM2717_15 Datasheet, PDF (11/17 Pages) Texas Instruments – LM2717 Dual Step-Down DC/DC Converter

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LM2717
SNVS253D – MAY 2005 – REVISED MARCH 2013
C_SS1
C_C1 ^{47 nF} 20k
4.7 nF
R_C1
C_{BG 1 nF}
C_C2
2k
4.7 nF
R_C2
R_F
C_{SS2 47 nF}
AGND
C_BOOT1
4.7 nF
U1
CB1
FB1
SS1
V_C1
V_BG
V_C2
SS2
20.5k
FSLCT
AGND
AGND
AGND
PGND
SW1
SHDN1
V_IN
V_IN
V_IN
SHDN2
CB2
FB2
SW2
PGND
PGND
PGND
LM2717
PGND
*Connect CINA (pin
23) and CINB (pins
14,15) as close as
possible to the VIN
pins.
C_BOOT2
*C_INB
4.7 PF
ceramic
L1
22 PH
3.3V OUT1
D1
MBRS240
C_OUT1A
1 PF
ceramic
C_OUT1
68 PF
17V to 20V IN
*C_INA
4.7 PF
ceramic
C_IN
68 PF
1 PF
L2
22 PH
15V OUT2
D2
MBRS240
R_FB1
221k
C_OUT2A
1 PF
ceramic
C_OUT2
68 PF
R_FB2
20k
Figure 12. 15V, 3.3V Output Application
C_SS1
C_C1 ^{47 nF} 20k
4.7 nF
C_BG
R_C1
1 nF
C_C2
10k
4.7 nF
R_C2
R_F
C_{SS2 47 nF}
AGND
C_BOOT1
1 PF
U1
CB1
FB1
SS1
V_C1
V_BG
V_C2
SS2
20.5k
FSLCT
AGND
AGND
AGND
PGND
SW1
SHDN1
V_IN
V_IN
V_IN
SHDN2
CB2
FB2
SW2
PGND
PGND
PGND
LM2717
PGND
*Connect CINA (pin
23) and CINB (pins
14,15) as close as
possible to the VIN
pins.
C_BOOT2
*C_INB
4.7 PF
ceramic
L1
22 PH
3.3V OUT1
D1
MBRS240
C_OUT1A
1 PF
ceramic
C_OUT1
68 PF
8V to 20V IN
*C_INA
4.7 PF
ceramic
C_IN
68 PF
1 PF
L2
22 PH
5V OUT2
D2
MBRS240
R_FB1
59k
C_OUT2A
1 PF
ceramic
C_OUT2
68 PF
R_FB2
20k
Figure 13. 5V, 3.3V Output Application
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