XR79120 Datasheet, PDF (15/19 Pages) Exar Corporation – 22V, 20A Synchronous Step Down COT Power Module

Application Circuit
XR79120
R4 10k
R3 38.3k
CSS
47nF
RON
12.1k
R5 10k
VCC
1
FB
2
3
PVIN
4
CVIN
0.1uF
VCC 5
CVCC
6
4.7uF
7
PGOOD
FB
AGND
VIN
VCC
GL
GL
GL PAD
8 _PGND
OP T IONA L
CSNB
1.5nF
SW PAD
9
10
11
12
27
28
29
30
31
32
SW
SW
SW
SW
SW
SW
SW
SW
SW
SW
RSNB
1 Ohm
RLIM
2k
U1
XR79120
PVIN
12VIN
3x 22uF
500kHz, 20A @ 1.8VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
CFF
0.47nF
VOUT PAD2
VOUT PAD1
4x 100uF
R1
4.02k
FB
R2
2k
© 2014 Exar Corporation
15 / 19
exar.com/XR79120
Rev 1A