The LM4938 is a monolithic integrated circuit that provides DC volume control and stereo bridged audio power amplifiers. It is capable of producing 2W power into 4Ω with less than 1.0% THD or 2.2W power into 3Ω with less than 1.0% THD. The LM4938 features an externally controlled, low-power consumption shutdown mode, and both a power amplifier and headphone mute for maximum system flexibility and performance.
The LM4938 is a monolithic integrated circuit that provides DC volume control and stereo bridged audio power amplifiers capable of delivering up to 2 W into 4 Ω with less than 1 % THD+N. It includes a low‑power shutdown mode, headphone mute, and selectable gain or bass boost, making it suitable for multimedia monitors, portable radios, and desktop or portable computer applications.
The document includes key specifications, absolute maximum ratings, electrical characteristics for both bridged and single‑ended modes, typical application circuits, performance graphs, physical dimensions, and compliance information such as RoHS and life‑support policy statements.
| Shutdown Current | 0.5 µA (typ) |
|---|---|
| Supply Voltage Range | 2.7 V (min) – 5.5 V (max) |
The LM4938 has a typical shutdown current of 0.5 µA.
The device operates from 2.7 V minimum to 5.5 V maximum supply voltage.
Yes, the LM4938 provides a headphone mute for maximum system flexibility.