The AP3064M-G1’s protection pin (Pin 2) is a powerful, often overlooked feature that transforms a basic LED driver into a safety-critical component. By understanding its latch-off behavior, threshold voltage (1.24V), and proper interfacing with NTCs, voltage supervisors, or open-drain outputs, you can prevent catastrophic failures due to overheating, over-voltage, or external system faults.
If the datasheet is not available, measure a working board: PROT voltage normal = ~1.2–2.5V, fault = <0.4V. ap3064m-g1 protection pin