8682l Ic Datasheet [better] Now

: Frequently replaced on MacBook Pro logic boards (like the 820-2879-B ) when the device fails to charge or does not recognize the battery.

in laptop motherboards and portable electronics. Manufactured by O2Micro International

| Symptom | Likely Cause | Solution | |-----------------------------|-----------------------------------------------|-----------------------------------| | No output voltage | Enable pin floating or grounded | Tie EN to VIN if not used | | Output voltage low (<2.5V) | Overcurrent or short circuit | Reduce load or check downstream | | Output voltage = input | IC damaged (pass transistor shorted) | Replace IC | | IC gets very hot | Dropout voltage too high (Vin=5V, Vout=3.3V at 400mA) | Add heatsink or use switching reg | | Ripple or oscillation | Output capacitor ESR too high or missing | Use 1uF-10uF ceramic |