UT986eb User Manual
UC-08-M37 EN R1.0
Power Supply
7
3.1
3.3 V LDO Power Supply
VCC outputs 3.3 V voltage after passing through the LDO circuit to provide power to the
evaluation board.
Vout=0.8*(1+16/5.1)=3.31V
Dopout Voltage: 170mV@1A
0805
0805
U2
TPS7A8101DRB
Figure 3-3 LDO Circuit
Notes:
The rated output current of LDO should be more than twice the current of the
module.
R16 is a series resistor placed at the input of the LDO, which is used for
debugging. When selecting the resistor, choose one with high rated power to
ensure the current capability. Here, a 0805 0-ohm resistor is selected.
R17 is a resistor connected in parallel with LDO. After removing R16 and
soldering R17, you can use an external power to supply the module.
When using the LDO to power the module, you should consider the power
dissipation of the LDO.
