Texas Instruments TPS65987-90, User Manual, Page: 13 / 25

AUX
10
EN
4
ENUSB
7
FAULT
8
GND
5
ILIM
6
IN
3
PGND
2
SW
1
USB
9
PAD
11
U12
TPS2500DRCR
0.1µF
C74
0.1µF
C76
GND
GND
GND
10uH
L3
GND
0.1µF
C85
GND GND
ILim set
Max 1100mA
Typ 900mA
Min 700mA
2.2µH
L4
0.1µF
C79
GND
22µF
C75
VIN
1
VSENSE
6
EN
8
PGOOD
10
GND
3
COMP
7
PH
2
BOOT
9
PAD
11
GND
4
GND
5
U10
TPS54334DRCR
300pF
C82
2.61k
R124
6800pF
C83
GND
P
GD
_
3
V3
GND
47µF
C88
100k
R122
32.4k
R127
150k
R120
66.5k
R126
32.4k
R129
TP6
TP7
47µF
C77
47µF
C78
47µF
C86
47µF
C84
0.1µF
C87
47µF
C89
SYS_PWR
P5V0
GND
GND
P3V3
P3V3
P3V3
220pF
C81
V3V3_Sense
AUX
10
EN
4
ENUSB
7
FAULT
8
GND
5
ILIM
6
IN
3
PGND
2
SW
1
USB
9
PAD
11
U12
TPS2500DRCR
0.1µF
C74
0.1µF
C76
GND
GND
GND
10uH
L3
GND
0.1µF
C85
GND GND
ILim set
Max 1100mA
Typ 900mA
Min 700mA
2.2µH
L4
0.1µF
C79
GND
22µF
C75
VIN
1
VSENSE
6
EN
8
PGOOD
10
GND
3
COMP
7
PH
2
BOOT
9
PAD
11
GND
4
GND
5
U10
TPS54334DRCR
300pF
C82
2.61k
R124
6800pF
C83
GND
P
G
D
_
3
V
3
GND
47µF
C88
100k
R122
32.4k
R127
150k
R120
66.5k
R126
32.4k
R129
TP6
TP7
47µF
C77
47µ µF
C78
47µF
C86
47µF
C84
0.1µF
C87
47µF
C89
SYS_PWR
P5V0
GND
GND
P3V3
P3V3
P3V3
220pF
C81
V3V3_Sense V3V3_Sense
Buck Convertor: SYS_PWR => 3.3V
Boost Convertor: 3.3V => 5V
&
3
4
1
6
2
V+
V-
5
U11
560k
R125
39k
R123
GND
GND
100k
R118
15.0k
R121
GND
22pF
C80
GND
0
R119
0.1µF
C73
SYS_PWR
P3V3
/PGOOD
3
4
1
6
2
V+
V-
V-
5
U11
560k
R125
39k
R123
GND
GND
100k
R118
15.0k
R121
GND
22pF
C80
GND
0
R119
0.1µF
C73
SYS_PWR
P3V3
/PGOOD
Barrel Jack Detection
100k
R128
SW Node Buck
SW Node Boost
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Schematic
13
SLVUBF3A – May 2018 – Revised August 2018
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TPS65987-90 Evaluation Module
Figure 9. Buck and Boost DC/DC Convertors