The LM4962 is a compact 5mm x 5mm audio amplifier IC that integrates a built-in boost converter, making it ideal for driving ceramic speakers and stereo speaker systems. It supports both mono ceramic speakers and capacitive loads, offering high performance in a small form factor. The device operates on a 3.2V DC power supply and can deliver a 15V peak-to-peak output for bridged load (BTL) configurations, maintaining a low THD+N of less than 1%. To ensure reliability, the chip includes overcurrent and overvoltage protection features to safeguard the internal boost converter. Additionally, the integrated DC/DC converter comes with a soft-start function, reducing stress on the power supply during startup.
The LM4953 is another audio amplifier designed specifically for ceramic speakers, utilizing a charge pump to efficiently drive the load. It requires only eight external components, making it a simple and cost-effective solution. Encased in a 3mm x 4mm package, the LM4953 combines an audio amplifier and charge pump in one, capable of boosting a 3.6V supply to provide up to 12.6V peak-to-peak for a 2µF + 30Ω bridge load. It also ensures minimal distortion and noise, keeping THD+N below 1%.
Both devices feature a low-power shutdown mode, which helps conserve energy when not in use. They also include internal thermal shutdown protection, eliminating the need for external startup capacitors or transient voltage suppression circuits. Additionally, they are equipped with a “switch/switch†noise suppression circuit to reduce unwanted interference. Their unity gain is highly stable, and they can be easily configured with an external gain-setting resistor to suit different application requirements. These features make both the LM4962 and LM4953 excellent choices for compact, high-performance audio applications.
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