2. TPS2022DG4 Substitution Conclusion While a direct replacement is feasible in terms of functional interface and current rating, critical electrical differences exist, necessitating circuit compatibility evaluation. The TPS2022DG4 matches the original device in package, interface logic, rated current (1A), and supply voltage range. However, its output stage employs an N-channel MOSFET, whereas the original uses a P-channel type. Their drive-level logic is inherently opposite at the circuit level: a P-channel high-side switch is typically enabled by a low-level signal, while an N-channel high-side switch requires an internal charge pump and is enabled by a high-level signal. A direct swap could therefore prevent the original control logic from correctly switching the load. Furthermore, the TPS2022DG4 features a lower on-resistance (33mΩ), which is beneficial for reducing conduction losses. However, its fault protection lacks a "reverse current" blocking feature. This is a significant omission for applications requiring protection against current backflow from the output to the input (e.g., hot-swap or USB power management) and could compromise system safety and reliability.