LM4819MM/NOPB

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LM4819MM/NOPB is a low-voltage power amplifier manager with pop control. It processes a single-ended input signal to drive stereo headphones with a maximum output of over 1.7V RMS. Designed with a wide 36dB gain range, the LM4819MM/NOPB functions as a low-power portable audio amplifier in space-limited applications. With a low 0.4μA quiescent current, it serves as an ultra-low power solution for digital media players, personal portable radios, and cellular phones.

The audio amplifier of the LM4819MM/NOPB operates with a wide supply voltage range of 2.7 to 5.5V. Its low quiescent current allows it to run at higher supply voltages, making it ideal for operation in battery-powered applications. The device is designed to provide the needed current to stereo headphones without the need for bulky transformers and electrolytic capacitors. Internal Pop control prevents spurious transients at turn on/off times and reduces the audible “thump” by driving the headphone output with a pop-free ramp up or ramp down signal.

The LM4819MM/NOPB includes shutdown circuitry which reduces supply current to less than 0.1μA when disabled. Other features include a power-on reset circuit, a manually adjustable gain control, and the capability to invert audio channels for proper stereo placement when driven from a headphone amplifier with an external gain control.

When it comes to working principle, the LM4819MM/NOPB has a two stage audio amplifier block. The first stage is a differential amplifier which works as an input buffer, while the second is a common collector power amplifier. The differential amplifier uses two current mirrors to biasing the output transistor at either side. The common collector amplifier translates the differential signal and amplifies it to the required voltage level.

The device is protected by short-circuit protection circuitry that prevents shutdown in the case of a short circuit at the output. It also has overload protection using a thermal shutdown circuit which senses the die temperature. This protection feature eliminates the need for external current limit components.

The LM4819MM/NOPB is a versatile audio amplifier for consumer electronic devices. Its low power consumption and high output current capability make it well suited for portable audio applications. The device is manufactured in a compact TSOP-6 package, making it ideal for space-limited applications.

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