Output power and supply headroom
The LM4862MX/NOPB delivers 825 mW into an 8 Ω load from a single 5 V supply — enough drive for a small speaker or piezoelectric transducer in a battery-powered audio path.
Class AB topology and on-chip features
As a Class AB amplifier, it biases the output stage to eliminate crossover distortion at low signal levels — the idle current draw is higher than a Class D but the linearity is better for voice-band or analog audio where THD matters. The shutdown pin pulls the quiescent current to near zero, extending battery life in duty-cycled applications. Thermal protection folds back the output drive if the die temperature exceeds the safe operating area, preventing latch-up during a sustained short on the speaker output.
The supply decoupling capacitor should sit within 5 mm of the VDD pin to keep the power-supply rejection ratio above 60 dB across the audio band. The shutdown pin has an internal pull-down; leaving it floating keeps the amplifier active, but a logic-low on the pin disables the output stage.
Lifecycle and compliance
The part is ROHS3 compliant, meaning the solder termination is lead-free and the material declaration covers the full substance restriction list under EU RoHS. No official second-source or pin-compatible alternative is documented from TI; the Boomer® family shares the same pinout across several output-power grades, but the specific 825 mW variant is the one called out on the BOM.