Power Supplies; Figure 4-1. Boost Converter, Ldo, And Input Polarity Protection - Texas Instruments ADS9218EVM-PDK User Manual

Power Supplies

4 Power Supplies
The TSWDC155EVM can provide power using the 3.3-V supply, but is not enabled by default on the
TSWDC155EVM. Typical use requires external power on J17. The TSWDC155EVM provides the ADS9218EVM
with a 3.3-V supply. The ADS9218EVM has a TPS61070 boost converter that boosts the 3.3-V supply to 5.4
V. This voltage is applied to low-dropout regulators (LDOs) to derive the AVDD and the DVDD supply. The
TPS7A2050 provides the 5-V AVDD supply and the TPS7A2018 provides the 1.8-V DVDD supply. The required
power connection is made through jumper J18 can be set to allow external power to be applied on screw
terminal J17. In this case U2, an LM66100 device, provides reverse polarity protection if the connection is
miswired. Figure 4-1 shows a schematic for various protection circuits.
J17
2
1
C32
D1 10V
1µF
6V
GND GND GND GND
L1
10uH
SPRW_SUP_3P3
U5
6
VBAT
3
EN
C5
16V
2
GND
10uF
TPS61070DDCR
GND GND

Figure 4-1. Boost Converter, LDO, and Input Polarity Protection

10 ADS9218EVM-PDK Evaluation Module
U2
1 6
IN OUT
2 5
GND ST
3 4
CE N/C
LM66100DCKR
J18
3
2
1
1
SW
5
VOUT
R2
4
FB
1.96M
C6
16V
10uF
R3
200k
GND GND
Copyright © 2022 Texas Instruments Incorporated
LDO_IN
U3
1
IN
3
EN
4
NC
TPS7A2050PDBVR
C1
1µF
16V
R1
2.2k
GND
U4
D2 1
IN
Green 3
EN
4
NC GND
GND TPS7A2018PDBVR
C3
1µF
16V
GND
5V
5
OUT
2
GND
C2
1µF
16V
GND GND
1V8_VDD
5
OUT
2
C4
1µF
16V
GND GND
SBAU409 – SEPTEMBER 2022
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AVDD
VDD