TPA0112PWPG4

Overview

The TPA0112PWPG4 is a stereo Class-AB audio power amplifier in a 24-pin PowerPAD TSSOP package. It delivers 2.6 W per channel into 3-ohm loads and 2.05 W into 8-ohm loads at 1% THD+N with a 5 V supply. The device features four selectable BTL gain settings (2, 6, 12, and 24 V/V) via GAIN0/GAIN1 pins, while SE mode is fixed at 1 V/V for headphone drive. It includes an internal input MUX for line or headphone sources, PC-beep functionality, and depop circuitry. Supply current is 6 mA in operation and less than 150 µA in shutdown.

Feature Summary

• Integrated stereo input multiplexer allows automatic switching between line inputs and headphone outputs based on the SE/BTL control pin.
• Internal gain configuration eliminates external resistors, providing selectable bridge-tied load gains of 2, 6, 12, or 24 V/V.
• Built-in depop circuitry virtually eliminates output transients during power-up and shutdown to prevent speaker noise.
• PowerPAD thermally enhanced package provides high thermal performance comparable to larger through-hole packages.

Applications

• Notebook computer internal speaker amplification
• Desktop PC line-out drivers
• Headphone amplifier stages

Procurement Notes

Verify the PWP suffix indicates the thermally enhanced 24-pin TSSOP PowerPAD package. Confirm the PG4 suffix denotes lead-free and RoHS compliance status. Ensure the ordering suffix matches the required tape-and-reel or tube packaging format if applicable. Cross-reference the specific revision level against the latest Texas Instruments datasheet to confirm functional equivalence.

Selection Notes

Select this component when a low-profile surface-mount solution is required for stereo audio applications. The integrated input MUX simplifies designs requiring both line-out and headphone driving capabilities. The device is suitable for single-supply systems operating at 5 V. Consider the thermal requirements of the application, as the PowerPAD package requires adequate PCB copper area for optimal heat dissipation.

Part Context

The TPA0112 is part of Texas Instruments' legacy stereo audio power amplifier family designed for portable and desktop computing environments. It utilizes CMOS technology to achieve low quiescent current and high efficiency. The device was introduced to replace discrete amplifier solutions, offering a compact footprint and reduced external component count for system designers.

Replacement Considerations

Check for TPA0112PWPR for taped and reeled packaging options. Verify compatibility with TPA0112PWP for tube-packaged units. No direct cross-model replacements are documented in the provided source material.

FAQ

How is the amplifier gain configured?

Gain is set internally using the GAIN0 and GAIN1 digital input pins. In BTL mode, these pins select gains of 2, 6, 12, or 24 V/V. In SE mode, the gain is fixed at 1 V/V regardless of the pin states.

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 output mode. When held low, it selects line inputs (LLINEIN/RLINEIN) and Bridge-Tied Load output mode.