The LM4918 is a monolithic integrated circuit that provides a automatic gain control (AGC), and stereo bridged audio power amplifiers capable of producing 1W into 8Ω with less than 1.0% THD.
The LM4918 is a monolithic integrated circuit that provides automatic gain control (AGC) and stereo bridged audio power amplifiers capable of delivering 1 W into an 8 Ω load with less than 1 % THD. It is designed for multimedia monitors, portable radios, and desktop or portable computer applications.
Key features include an externally controlled low‑power shutdown mode, mute function for maximum system flexibility, bridge‑mode operation that doubles voltage swing for four‑times the power, and a variety of protection circuits such as thermal shutdown and click‑pop suppression. The device operates from a 2.7 V to 5.5 V supply and offers selectable standby modes and headphone‑sense functionality.
| THD+N (1 kHz, 1 W, 8 Ω) | 0.3 % typ |
|---|---|
| Quiescent Supply Current | 18 mA typ |
| Shutdown Supply Current | 1 µA typ |
| Supply Voltage Range | 2.7 V – 5.5 V |
| Output Power (8 Ω, ≤1 % THD+N) | 1.1 W min |
The typical quiescent supply current is 18 mA.