UG-400 Datasheet, PDF (15/20 Pages) Analog Devices – Plug and play system evaluation

Hardware User Guide
UG-400
1.2 V, 2.5 V, AND 5 V POWER SUPPLIES
A P-channel MOSFET is used to regulate the 3.3 V input to
1.2 V (see Figure 13). The ADP1706 linear regulator is used to
regulate the 3.3 V input to 2.5 V (see Figure 14). The ADP3335
low dropout regulator is used to regulate the UNREG_IN input
to 5 V (see Figure 15).
VROUT
3.3V
U3
1
5
2
6
3
7
4
8
C9
100uF
C10
10uF
C11
0.1uF
FDS9431A
L3
10uH
D4
ZHCS1000
1.2V
TP3
1.2V
C8
100uF
GND
GND
GND
Figure 13. 1.2 V Power Supply
3.3V
C232
4.7uF
GND
GND
U39
3
4
IN
IN
1
2
EN
GND
ADP1706
5
OUT
6
OUT
7
SENS
8
SS
2.5V
TP6
2.5V
C231
10nF
C233
4.7uF
GND
GND
GND
Figure 14. 2.5 V Power Supply
UNREG_IN
C229
1uF
U38
7
8
IN
IN
6
SD
4
GND
ADP3335
1
OUT ₂
OUT
3
OUT
5
NR
GND
GND
Figure 15. 5 V Power Supply
Rev. 0 | Page 15 of 20
5V
TP5
5V
C230
1uF
GND