TPA0112PWP

Overview

The TPA0112PWP is a stereo audio power amplifier in a 24-pin thermally enhanced PowerPAD package. It delivers 2.6 W per channel into 3-ohm loads and operates with a supply voltage of 4.5 V to 5.5 V. The device features four selectable gain settings (2, 6, 12, and 24 V/V) via GAIN0 and GAIN1 pins, an internal input MUX for line or headphone sources, and integrated depop circuitry. It consumes 6 mA in normal operation and less than 150 µA in shutdown mode.

Feature Summary

• Integrated input multiplexer allows automatic switching between line and headphone inputs based on SE/BTL control.
• Internal gain control eliminates external resistors, offering four selectable BTL gain levels.
• Built-in depop circuitry minimizes speaker transients during power-up and shutdown.
• PowerPAD thermal package provides high heat dissipation comparable to larger through-hole packages.

Applications

• Notebook computer audio systems
• PC desktop line-out circuits
• Headphone amplifiers

Procurement Notes

Verify the specific PWP package variant against the datasheet revision date. Confirm that the thermal pad soldering requirements are met in the PCB layout to ensure proper heat dissipation. Check for availability of the taped and reeled suffix 'R' if automated assembly is required. Ensure the supply voltage range matches the system's 5 V rail specifications.

Selection Notes

Select this component when a compact stereo amplifier with low quiescent current is needed for single-supply applications. The internal MUX simplifies design by removing external switching components. Consider the input impedance variations across gain settings when designing coupling capacitors. The PowerPAD package requires careful thermal management on the PCB to achieve optimal performance.

Part Context

This part belongs to Texas Instruments' family of Class-AB audio power amplifiers designed for portable and desktop audio applications. The TPA0112 specifically targets notebook and PC markets where board space is limited. It integrates functions typically requiring multiple discrete components, such as gain setting and input selection, to reduce overall system complexity.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.

FAQ

How is the amplifier gain configured?

Gain is set internally using the GAIN0 and GAIN1 digital input pins. In BTL mode, gains of 2, 6, 12, and 24 V/V are selectable. In SE mode, the gain is fixed at 1 V/V.

What is the function of the SE/BTL pin?

The SE/BTL pin controls the input multiplexer and output configuration. When held high, it selects headphone inputs (LHPIN/RHPIN) and Single-Ended mode. When held low, it selects line inputs (LLINEIN/RLINEIN) and Bridge-Tied Load mode.