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XR76108 Datasheet, PDF (15/17 Pages) Exar Corporation – 8A and 12A Synchronous Step Down COT Regulator
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XR76108 and XR76112
Applications Circuit
Circuit to derive EN / MODE from VIN
DZ MMSZ4685 RZ 10k
2-3 --> DCM / CCM
J1
3
2
1
3
2
1
1-2 --> CCM
C 0.22uF
R4 71.5k
R3 60.4k
CBST
0.1uF
EN/MODE
PGOOD
SW RLIM 2.5k 1 ILIM
2
EN
RON
6.8k
3 TON
CSS 47nF
4
SS
5 PGOOD
VCC
6
FB
R5 10k
7 AGND
FB
AGND PAD
XR76112
CIN 0.1uF
CVCC 4.7uF
PVIN
VCC
12VIN
PVIN
PVIN 22
21
PVIN
SW 20
19
PGND
PGND 18
17
PGND
PGND 16
15
PGND
PGND PAD
3x10uF
L1 IHLP-4040DZ-01
0.56uH @ 27A, 1.7mOhm
600kHz, 12A@1.2VOUT
RSNB
1 Ohm
CFF
2.2nF
470uF
3x22uF
R1
2k
CSNB 1.5nF
RFF
5 Ohm
FB
R2
2k
Figure 37: XR76112 Application circuit schematic
Circuit to derive EN / MODE from VIN
DZ MMSZ4685 RZ 10k
2-3 --> DCM / CCM
3
J1
3
2
1
2
1
1-2 --> CCM
C 0.22uF
R4 71.5k
R3 60.4k
CBST
0.1uF
EN/MODE
PGOOD
SW RLIM 2.2k 1 ILIM
2
EN
RON 6.8k 3 TON
CSS 47nF
4 SS
5 PGOOD
VCC
6 FB
R5 10k
7 AGND
FB
AGND PAD
XR76108
CIN 0.1uF
CVCC 4.7uF
PVIN
VCC
12VIN
PVIN
PVIN 22
21
PVIN
SW 20
PGND 19
PGND 18
PGND 17
PGND 16
PGND 15
PGND PAD
2x10uF
L1 IHLP-4040DZ-01
1uH @ 17.5A, 3.7mOhm
RSNB
1 Ohm
CFF
4.7nF
R1
2k
600kHz, 8A@1.2VOUT
330uF
3x22uF
CSNB 1nF
RFF
0 Ohm
FB
R2
2k
© 2013-2014 Exar Corporation
Figure 37: XR76108 Application circuit schematic
15/17
www.exar.com
Rev. 2A
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