Voltage Regulators and Load Switches
+5 Boost Regulator (U21)
The +5 volt boost regulator (a Fairchild* FAN48623 switching regulator) converts the +VSYS input supply to a +5 volt power rail, labelled +V5P0V. See Maximum Current Draw for the maximum allowable current draw.
The +V5P0V power rail supplies power to:
- Micro-HDMI* connector
- USB load switches and the micro-USB Type-B debug port
- Breakout connector J13 and the fan header
Note: |
+3.3 Boost Regulator (U27)
The +3.3 volt buck/boost regulator (a Texas Instruments* TPS63021 switching regulator) converts the +VSYS input to a +3.3 volt power rail labelled +V3P3V. See Maximum Current Draw for the maximum allowable current draw.
The +V3P3V power rail supplies power to:
- USB Type-C Mux
- Micro-SD card interface level shifter and connector
- HDMI and UART debug interface level shifters
- Intel Joule module connector level shifters
- Breakout connector J13 and the fan header
Note: |
+1.8 Buck Regulator (EU5)
The +1.8 volt buck regulator (a Texas Instruments* TLV62084 switching regulator) converts the +VSYS input supply to a +1.8 volt power rail labelled +V1P8V. See Maximum Current Draw for the maximum allowable current draw.
The +V1P8V power rail supplies power to:
- Micro-SD card interface level shifter and connector
- HDMI and UART debug interface level shifters
- Intel Joule module connector level shifters
- Breakout connector J13
Note: |
USB Load Switches (U17 and EU3)
There are two USB load switches (a Fairchild* FPF2495UCX and a Texas Instruments* TPS2553DRVT) that control the delivery of the +V5P0V supply to the USB Type-C Configuration Channel (CC) lines for the module, and the USB Type-C and USB Type-A connectors.
Module Sourced Power Supplies (+VDD1 and +VDD3)
The module provides two power rails, each limited to 300 mA, to expansion board J12.
The +VDD1 supply:
- Provides signal to enable the +1.8-volt buck regulator
- Enables pullup signals for the DnX and general purpose buttons and the EEPROM I2C interface.
The +VDD3 supply:
- Enables +5 volt boost regulator and the +3.3 volt buck/boost regulator
The +VDD1 and +VDD3 are routed to the expansion board breakout connectors where they can be used to power other circuitry.
Caution: |
Module Sourced Power Supplies Electrical Specifications
Source | Item | Min | Typ | Max | Units | Max mA |
VDD1 | +VDD1 | 1.71 | 1.8 | 1.89 | V | 300 |
VDD3 | +VDD3 | 3.15 | 3.3 | 3.45 | V | 300 |
Note: Do not exceed specified current limits. Ensure that all device loads are accounted for.