TPA311DR

Overview

The TPA311DR is a Class-AB mono audio power amplifier by Texas Instruments, housed in an 8-SOIC surface-mount package. It operates on a supply voltage range of 2.5 V to 5.5 V and supports both Bridge-Tied Load (BTL) and Single-Ended (SE) configurations. In BTL mode with an 8 Ω load, it delivers up to 700 mW at 5 V and 250 mW at 3.3 V. The device features integrated depop circuitry to eliminate speaker noise during shutdown transitions, along with thermal and short-circuit protection for reliable operation.

Feature Summary

• Supports dynamic switching between bridge-tied load and single-ended modes via the SE/BTL pin
• Includes integrated depop circuitry to virtually eliminate pop noise during power cycling or shutdown
• Features built-in thermal overload and short-circuit protection mechanisms

Applications

• Low-voltage portable electronic devices requiring internal speakers
• External earphone drive applications utilizing single-ended configuration
• Battery-powered equipment where external coupling capacitors are undesirable

Procurement Notes

Verify that the component matches the specific 8-SOIC package variant designated by the 'R' suffix for tape-and-reel packaging. Confirm the manufacturer is Texas Instruments and check for RoHS compliance status. Ensure the part number corresponds to the production data revision SLOS207C to guarantee electrical characteristics align with the official datasheet specifications.

Selection Notes

Select this amplifier for applications requiring high efficiency in low-voltage environments without the complexity of Class-D designs. The ability to switch between BTL and SE modes allows for flexible system design, accommodating both internal speakers and external headphones. Consider the thermal dissipation requirements when operating near maximum power limits in enclosed spaces.

Part Context

The TPA311 belongs to the TPA311 family of audio amplifiers designed specifically for low-voltage consumer electronics. Unlike higher-power Class-D alternatives, this Class-AB device prioritizes simplicity and cost-effectiveness for voice-band and narrowband audio applications. It serves as a direct replacement for older discrete amplifier solutions in compact mobile devices.

Replacement Considerations

TPA311DGN is available in an MSOP package offering reduced board space.