LM4890M

The Texas Instruments LM4890M is a Class-AB audio power amplifier capable of delivering 1 watt of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5V DC power supply. It is designed for demanding applications in mobile phones and other portable communication devices.

Key electrical specifications include a wide operating supply voltage range of 2.2V to 5.5V, with a power stage supply also ranging from 2.2V to 5.5V. The amplifier exhibits a typical THD+N of 0.1% at 1 kHz and can drive a minimum load impedance of 8Ω. It features a shutdown current of 0.1μA (typical) and a PSRR of 62dB (typical) at 217Hz with VDD = 5V.

This audio amplifier is available in space-saving packages such as DSBGA, VSSOP, SOIC, and WSON. It offers features like ultra-low current shutdown mode, BTL output capable of driving capacitive loads, and an improved pop & click circuitry to eliminate noises during turn-on and turn-off transitions. It also includes thermal shutdown protection and is unity-gain stable with external gain configuration capability. No output coupling capacitors, snubber networks, or bootstrap capacitors are required, simplifying external circuitry.

The LM4890M is suitable for various audio applications in portable electronics where high-quality amplification is needed within a compact form factor and with efficient power management.