XR77103 Datasheet, PDF (21/28 Pages) Exar Corporation – 3-Output Programmable Buck Regulator

XR77103
Applications Information (Continued)
V_BUCK1 Register (00h)
The V_BUCK1 register has 7 bits of data for setting output of Buck 1 and 1 bit of data for use of external feedback voltage
through a resistor divider. The Buck 1 programmable voltage range is from 0.8V to 6V with 0.05V resolution. When EXT1 is
set to 1, the output voltage is adjusted by the external resistor divider from the output to ground with the center tap connected
to V_OUT1 pin regardless of the value of the output voltage setting register. The factory default NVM value is 00h (0.8V).
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
EXT1 D6
D5
D4
D3
D2
D1
D0
Hex
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
10
11
12
13
14
15
16
17
18
19
V_OUT (V)
0.8
0.85
0.9
0.95
1
1.05
1.1
1.15
1.2
1.25
1.3
1.35
1.4
1.45
1.5
1.6
1.65
1.7
1.75
1.8
1.85
1.9
1.95
2
2.05
Hex
1A
1B
1C
1D
1E
20
21
22
23
24
25
26
27
28
29
2A
2B
2C
2D
2E
30
31
32
33
34
V_OUT (V)
2.1
2.15
2.2
2.25
2.3
2.4
2.45
2.5
2.55
2.6
2.65
2.7
2.75
2.8
2.85
2.9
2.95
3
3.05
3.1
3.2
3.25
3.3
3.35
3.4
Hex
V_OUT (V)
35
3.45
36
3.5
37
3.55
38
3.6
39
3.65
3A
3.7
3B
3.75
3C
3.8
3D
3.85
3E
3.9
40
4
41
4.05
42
4.1
43
4.15
44
4.2
45
4.25
46
4.3
47
4.35
48
4.4
49
4.45
4A
4.5
4B
4.55
4C
4.6
4D
4.65
4E
4.7
REV1B
Hex
V_OUT (V)
50
4.8
51
4.85
52
4.9
53
4.95
54
5
55
5.05
56
5.1
57
5.15
58
5.2
59
5.25
5A
5.3
5B
5.35
5C
5.4
5D
5.45
5E
5.5
60
5.6
61
5.65
62
5.7
63
5.75
64
5.8
65
5.85
66
5.9
67
5.95
68
6
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