Texas Instruments TPS65987-90, User Manual, Page: 12 / 25

22µF
C52
22µF
C53
GND
GND
Output capacitors must be rated to
at least 25V and have ESR in 100s of mOhms
VIN
8
ADJ
5
PGND
6
GND
2
ISEN
1
PGATE
7
EN
3
FB
4
U9
LM3489QMM/NOPB
270
R103
0.1µF
C54
GND
GND
SENSE
1
GND
4
POWER
2
POWER
3
GND
5
SHIELD
6
SHIELD
7
SHIELD
8
SHIELD
9
J9
GND
22µF
C60
22µF
C61
22µF
C62
22µF
C63
22µF
C64
22µF
C65
22µF
C66
22µF
C67
22µF
C68
22µF
C69
22µF
C70
22µF
C71
22µF
C72
SYS_PWR
GND
EN_VAR
GND
GND
10k
R104
PDO_2 PDO_1
P3V3
22µF
C59
SYS_PWR
30k
R100
GND
9.53k
R107
0.1µF
C56
Green
2
1
D20
8.87k
R111
1
2
3
Q11 1
2
3
Q12 1
2
3
Q13
1
2
3
Q14
3.65k
R112
47µF
C50
47µF
C51
VAR_DCDC
EN_VAR
PDO_1 PDO_2 PDO_3
GND
PDO_1 PDO_2
0
1
0
0
1
0
0 0
Output Voltage
5V
9V
15V
20V
Feedback (R1) Feedback (R2)
30k
30k
30k
30k 9.53k
4.59k
2.64k
1.79k
Output Voltage
5.14V
9.33V
15.32
22.03
PDO_3
0
0
0
1
1
2
3
Q16
1
2
3
Q17
PDO_0
1
2
3
Q15
22µF
C52
22µF
C53
GND
GND
Output capacitors must be rated to
at least 25V and have ESR in 100s of mOhms
VIN
8
ADJ
5
PGND
6
GND
2
ISEN
1
PGATE
7
EN
3
FB
4
U9
LM3489QMM/NOPB
270
R103
0.1µF
C54
GND
GND
SENSE
1
GND
4
POWER
2
POWER
3
GND
5
SHIELD
6
SHIELD
7
SHIELD
8
SHIELD
9
J9
SYS_ SYS_ SYS_PWR
GND
EN_VAR EN_VAR EN_VAR
GND
10k
R104
30k
R100
GND
9.53k
R107
0.1µF
C56
Green
2
1
D20
8.87k
R111
1
2
3
Q11 1
2
3
Q12 1
2
3
Q13
1
2
3
Q14
3.65k
R112
47µF
C50
47µF
C51
VAR_DCDC
EN_VAR EN_VAR EN_VAR
PDO_1 PDO_2 PDO_3
GND
PDO_1 PDO_2
0
1
0
0
1
0
0 0
Output Voltage
5V
9V
15V
20V
Feedback (R1) Feedback (R2)
30k
30k
30k
30k 9.53k
4.59k
2.64k
1.79k
Output Voltage
5.14V
9.33V
15.32
22.03
PDO_3
0
0
0
1
Variable DC/DC Convertor: 5V, 9V, 15V, 20V
GND
PDO_2 PDO_1
P3V3
1
2
3
Q16
PD
1
2
3
Q17
PDO_0
1
2
3
Q15
PD
Var. DC/DC Control LED's
22µF
C60
22µF
C61
22µF
C62
22µF
C63
22µF
C64
22µF
C65
22µF
C66
22µF
C67
22µF
C68
22µF
C69
22µF
C70
22µF
C71
22µF
C72
GND
22µF
C59
SYS_PWR
Fast Role Swap Caps
Change PDO's
GND
PDO_3
1
2
3
Q18
2.20k
R113
IN
4
IN
5
G
N
D
1
G
N
D
2
IN
6
G
N
D
3
P
A
D
7
U8
GND
10.0k
R114
10.0k
R115
10.0k
R116
10.0k
R117
100k
R102
11.0k
R106
1000pF
C55
1000pF
C58
1
3
2
D21
DNP
GND
SYS_PWR
1
3
2
D18
10µH
L2
4
7,8
1,2,3
5,6,
Q10
47.5k
R99
100pF
C57
SW_Node_VARDC
FB node on VAR_DC
100k
R109
100k
R110
100k
R108
10.0k
R105
100k
R101
0 R98
DNP
GND
White
1
2
D23
White
1
2
D24
White
1
2
D22
White
1
2
D25
5V 9V 15V 20V
TP5
TP4
Blue
1
2
D19
Schematic
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SLVUBF3A – May 2018 – Revised August 2018
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TPS65987-90 Evaluation Module
Figure 8. Variable DC/DC Controller