SparkFun Soft Power Switch Mk2 USB-C Schematic
Schematic for a USB-C soft power switch featuring a 2.0A max load, 5.5V max input, and integrated pushbutton control using SN74LVC1G175 and SIL2308 components.
Overview
This schematic document details the design of the SparkFun Soft Power Switch Mk2 USB-C. The circuit utilizes a high-side P-channel MOSFET (SIL2308) to control power delivery from a USB-C input to an output. Key components include a D-type flip-flop (SN74LVC1G175DCK) and Schmitt-trigger logic (SN74LVC1G17DCK, SN74LVC1G14DCK) to manage debounced latching functionality. The design supports a maximum input voltage of 5.5V and a maximum load current of 2.0A. It features dual USB-C receptacles, a 2.0A fuse for protection, and breakout pins for external button connection, remote 'OFF' control, and 'PUSH' status monitoring.
Use Cases
- USB-C power control for embedded systems
- Low-power latching circuits for battery-powered devices
- Consumer electronics power management
- Pushbutton power control for microcontroller projects
Topics
Referenced Parts
SIL2308
Vishay Siliconix
Q3A SIL2308 4A 20V
| SN74LVC1G14DCK | Texas Instruments | U2A SN74LVC1G14DCK |
| BAS16J | Nexperia | D1 BAS16J 100V |
| BSS138 | Onsemi | Q1 BSS138 0.2A 50V |
| SN74LVC1G175DCK | Texas Instruments | U4 SN74LVC1G175DCK |
| SN74LVC1G17DCK | Texas Instruments | U3A SN74LVC1G17DCK |
| SIL2308 | Vishay Siliconix | Q3A SIL2308 4A 20V |