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:  The +5-volt boost regulator does not start ramping up until the +VDD3 supply from the module connector (J2 pin 30) reaches a minimum of 1.575 V and +VSYS reaches at least 2.2 V.

 

+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:  The +3.3 volt buck/boost regulator does not start ramping up until the +VSYS supply reaches at least 1.8 V and the +VDD3 supply from the module connector reaches a minimum of 1.2 V.

 

+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:  The +1.8 volt buck regulator does not start ramping until the +VDD1 supply from the module connector reaches a minimum of 1.0 V and +VSYS reaches at least 2.7 V.

 

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:   Ensure that breakout connector loads do not cause power supplies to be overloaded.

 

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.

 

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