Texas Instruments Boomer® series, LM4991LDX/NOPB, Class AB audio power amplifier, 1-Channel (Mono), 3W x 1 @ 3Ohm max output, 2.2V ~ 5.5V supply, -40°C ~ 85°C, 8-WDFN Exposed Pad / 8-WSON (4x4) package, Surface Mount, Bulk.
| Parameter | Value |
|---|---|
| Type | Class AB |
| Series | Boomer® |
| Output type | 1-Channel (Mono) |
| Mounting | Surface Mount |
| Supply voltage | 2.2V ~ 5.5V |
| Max output power x channels @ load | 3W x 1 @ 3Ohm |
| Operating temperature | -40°C ~ 85°C (TA) |
| Package | Bulk |
| Features | Depop, Shutdown, Thermal Protection |
| Case | 8-WDFN Exposed Pad |
The 3W rating into 3Ω is the maximum output power at 1% THD+N typical for this Class AB stage. The supply voltage directly sets the available swing: at 5V you get the full 3W; at 3.3V output drops proportionally.
That means no last-time-buy window, no end-of-life notice pending. The NOPB suffix confirms lead-free / RoHS-compliant finish — no separate Pb-free conversion needed.
The LM4991MTX is a different package variant (TSSOP) of the same amplifier core. The LDX/NOPB is in an 8-WSON package. They are electrically equivalent but not pin-compatible — the package footprint differs.
The pinout is standard for the Boomer® mono amplifier family: pins include shutdown, bypass, input, output, and supply/ground. Refer to the datasheet for the exact pin mapping for the 8-WSON package.