TPA2001D1PW

Overview

The TPA2001D1PW is a 1-W mono bridge-tied-load (BTL) Class-D audio power amplifier manufactured by Texas Instruments. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and delivers 1 W of continuous output power into an 8-Ω load at 1 kHz with less than 1% total harmonic distortion plus noise (THD+N). The device utilizes third-generation modulation technology to eliminate the need for external LC output filters, achieving maximum efficiency between 75% and 85%. It features four internal gain settings selectable via digital inputs: 6 dB, 12 dB, 18 dB, and 23.5 dB. The amplifier includes integrated depop circuitry to minimize turn-on pop noise and provides comprehensive protection against short circuits to battery, ground, and load.

Feature Summary

• Filterless operation enabled by optimized third-generation modulation scheme that reduces switching current and eliminates the need for bulky LC output filters.
• Configurable gain architecture allowing selection among four distinct levels (6 dB, 12 dB, 18 dB, and 23.5 dB) through dedicated digital control pins.
• Integrated depop circuitry designed to reduce audible popping sounds during power-up sequences and shutdown mode transitions.
• Robust protection mechanisms including short-circuit protection for conditions involving shorts to the battery, ground, or the speaker load.

Applications

• Battery-powered portable audio devices requiring extended run time due to high efficiency
• Notebook personal computers utilizing built-in speakers
• Powered desktop speakers where the amplifier is housed within the same enclosure as the speaker

Procurement Notes

Verify the specific ordering suffix when purchasing. The base part number TPA2001D1PW corresponds to the tube package containing 90 units per tube. For tape and reel packaging, the suffix R must be added (TPA2001D1PWR), which contains 2000 units per reel. Confirm the required packaging format matches the production assembly equipment before placing orders.

Selection Notes

Select this component for low-voltage applications operating between 2.7 V and 5.5 V. Ensure the connected speaker impedance is at least 8 Ω to achieve the rated 1 W output power. Designers must account for the variable input impedance associated with different gain settings when calculating input capacitor values for the high-pass filter network. Verify that the application environment remains within the specified -40°C to 85°C operating temperature range.

Part Context

This device belongs to the TPA2001D1 family of filterless Class-D amplifiers. It is specifically engineered for single-supply operation in space-constrained and battery-sensitive environments. The PW package variant denotes a 16-pin Thin Shrink Small Outline Package (TSSOP) with thermal pad characteristics suitable for surface-mount assembly.

Replacement Considerations

No direct public substitute part numbers are documented in the provided source material.

FAQ

How is the amplifier gain configured?

The gain is set using two digital input terminals, GAIN0 and GAIN1. These pins allow configuration for gains of 6 dB, 12 dB, 18 dB, or 23.5 dB.

Why is an output filter not required?

The TPA2001D1 uses a modulation scheme where OUTP and OUTN are in phase with no input, significantly reducing ripple current and I²R losses in the load, thereby eliminating the need for an LC filter in most applications.

What is the purpose of the SHUTDOWN pin?

The SHUTDOWN pin places the amplifier into a low-current state to conserve battery power. Pulling this pin low mutes the outputs and reduces supply current to approximately 1 µA.