1. LP3872EMP-2.5/NOPB Substitution Conclusion From an electrical performance and functionality perspective, the LP3872EMP-2.5/NOPB can be considered a viable substitution candidate. The key differences are as follows: The dropout voltage increases from 0.44V for the original part to 0.55V (both measured at 1.5A). Under full load, the substitute device requires a higher input voltage to maintain a stable 2.5V output, necessitating re-verification for designs with tight input voltage headroom. The quiescent current (Iq) rises from 3mA to 5mA. Under no-load or light-load conditions, the substitute device will exhibit higher self-consumption, which may impact the standby time of battery-powered applications. Since both devices share identical package, output voltage, current capability, protection features (over-current, over-temperature, short-circuit), and enable control, direct substitution is feasible provided the application has sufficient input voltage margin and is not sensitive to light-load power consumption.