Quectel LTE OPEN EVB - Figure 5: Power Supply Schematic for Lte Open Evb

LTE Module Series
LTE OPEN EVB User Guide
LTE_OPEN_EVB_User_Guide 21 / 62
J0301
S0301
Power
jack
Power
switch
Step-down converter
U0301
TPS54319
VBAT
Power supply for
LTE-QuecOpen modules
3.3V
U0402
LDO
J0601
Micro-USB
interface
2.85V
U0403
LDO
Power supply for Wi-Fi modules,
ADC and eMMC
Power supply for
SD card
U0401
LDO
1.8V
Power supply for EEPROM, SD
card, eMMC, SPI Flash, codec
boards and Wi-Fi modules
Figure 5: Power Supply Schematic for LTE OPEN EVB
Figure 6: Power Interfaces
Before connecting the power supply, customers have to select a proper DC power adapter to supply
power for the LTE OPEN EVB, and the power plug design of the adapter is shown as below.
Inner contact
Outer contact
Figure 7: Power Plug Design