UM-B-093
DA1469x PRO Development Kit
User Manual
Revision 1.1
19-Feb-2019
CFR0012
13 of 22
© 2019 Dialog Semiconductor
Figure 15: 3.3V LDO for USB Hub
The remaining support circuits on the mainboard are powered by a second 3.3 V supply (U14). This
powers SEGGER (U4), FTDI (U12), and ADC (U8).
U14 is enabled by a signal coming from the USB hub. This signal (PWR_ENABLE) goes high after
the hub has successfully enumerated with a USB host. If we need to operate the system without a
host, for example, with an AC wall adapter, we need to solder a header on J6 and place a jumper.
Figure 16: 3.3 V LDO for Mainboard Peripherals
The analog/digital converter and several op-amps on the current measurement section need a clean
5.0 V power supply (
Figure 17
). This is generated by a step-up regulator (U18) which generates 6.0
V, and U18 is followed by a 5 V LDO (U17). U18 is also controlled by PWR_ENABLED.
Figure 17: Op-Amps/ADC 5.0 V Power Supply
VBUS_HUB
TP23
+3V3
C77
1.0uF
C76
22nF
C75
1.0uF
U13
RT9193-33GB
VIN
1
GN
D
2
EN
3
BP
4
VOUT
5
VDD_3V3_HUB
LP8
500mA_470 OHM
R70
330
D5
LED green
2
1
LP9
500mA_470 OHM
U14
RT9193-33GB
VIN
1
GN
D
2
EN
3
BP
4
VOUT
5
C78
22nF
C80
1.0uF
C79
1.0uF
PWR_ENABLE
3.3VA
LP10
500mA_470 OHM
C104
NP
3.3V
R71
10.0k
J6
NP
VDD_3V3_PERF
VBUS_HUB
TP38
3.3V
TP40
3.3VA
TP41
PWRLED
TP39
5.0V
U17
MIC5205-5.0Y M5
IN
1
GND
2
EN
3
BP
4
OUT
5
5.0V
C86
4.7uF
LP13
500mA_470 OHM
TP37
6.0V
6.0V
C88
1.0nF
D8
RB521S30T1G
2
1
L2
FLF3215T-100M
C105
100nF
PWR_ENABLE
LP1
500mA_470 OHM
R85
0
R84
10.0k
R83 38.3k
C85
1.0uF
C89
1.0uF
C87
1.0uF
3.3V
U18
AP3012KTR-G1
VIN
5
FB
3
SHDN
4
SW
1
GN
D
2
