The LM4861 is a 1.1W audio power amplifier designed for low-power portable systems. It features an externally controlled, low-power consumption shutdown mode and an internal thermal shutdown protection mechanism.
The LM4861 is a bridge‑connected audio power amplifier capable of delivering 1.1 W continuous average power into an 8 Ω load from a 5 V supply. It features an externally controlled shutdown mode, internal thermal shutdown protection, and unity‑gain stability. The device can be configured for differential gains up to 10 using external gain‑setting resistors.
Designed for low‑power portable systems, the LM4861 requires no output coupling, bootstrap, or snubber capacitors, allowing a compact surface‑mount package. Typical applications include personal computers, portable consumer products, and self‑powered speakers. Detailed electrical characteristics, performance curves, and application circuits are provided for bridge and single‑ended configurations.
| Shutdown current (typical) | 0.6 µA |
|---|---|
| Supply voltage range | 2.0 V – 5.5 V |
| Maximum junction temperature | 150 °C |
The LM4861 draws about 0.6 µA of quiescent current when the shutdown pin is activated.
It operates from a minimum of 2.0 V up to a maximum of 5.5 V supply voltage.