Sega Game Gear Power Board Design

flux

Below is a summary of the proposed schematic component additions:

Table

DesignatorComponentLinkPurpose
USB1USB‑C PortUSB‑C PortUSB‑C input with PD negotiation
U1BQ24075RGTT (already in project)BQ24075RGTTLiPo charger with load sharing (charge while using)
U2TPS2113APW (already in project)TPS2113APWAuto‑switching (power multiplexer)
U4Buck Converter 5VBuck Converter 5VRegulated 5V supply for main logic/CPU/VDP
U5Boost Converter 9VBoost Converter 9VOptional 9V supply for sound amplifier
TP3Test PointTest Point5V output voltage measurement
TP4Test PointTest PointOptional 9V output voltage measurement
SW1Power SwitchPower SwitchTest power isolation switch
LED1Power LED (with control circuit capability)Power LEDIndicator with ability to be turned off
Next Step: Define the Nets
After adding these components, we need to define the power and ground nets:
  1. Ground Net:
    • Create a ground net by adding the Ground component.
    • Wire all component GND pins (including those on U1, U2, U4, U5, the USB‑C port, and LED1’s control circuit if required) to this ground net.
  2. Power Nets:
    • Label the regulated 5V net coming from the Buck Converter (U4) as “5V.”
    • Label the optional 9V net from the Boost Converter (U5) as “9V.”
    • Also, mark the USB‑C input side and battery input nets appropriately (for example, “VIN”) for clarity.
You can use the "Apply changes" button to add the new components to your schematic. Once added, we can proceed to explicitly wire the power and ground nets as described.
Add components and nets
Update schematic and define nets
Place parts and set power connections
Incorporate components then wire nets
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