TAS2557YZT - 5.7W Class-D Smart Amp | Texas Instruments
MPN： TAS2557YZT ✓ 啟用中TAS2557YZT 概覽
A Class-D amplifier is a switching audio amplifier that efficiently converts a digital input into a pulse-width-modulated output suitable for driving a speaker. The TAS2557 extends this product category into a smart amplifier or audio SoC. Its digital control path supports advanced EQ and system-level tuning, while integrated protection reduces the need for separate output protection circuitry in suitable designs.
The headline specifications are 5.7 W output power, digital input operation, mono Class-D amplification, and Class-H boost with an 8.5 V boost capability. Speaker sense is included, allowing the device to detect a connected speaker and support speaker-protection functions. The verified ordering information identifies the TAS2557YZT specifically as the 42-pin DSBGA option.
The Class-H boost function raises the internal output voltage as needed, allowing Class-D efficiency to be maintained while supporting greater output swing than a conventional fixed-voltage Class-D stage. This makes the amplifier suitable for small speakers whose impedance and power handling characteristics demand more voltage than the battery or system rail can directly provide.
Typical uses include Bluetooth speakers, portable speakers, smart speakers, mobile audio accessories, consumer electronics, and other compact products where a digital audio source drives a single speaker. The integrated protection and advanced EQ features are especially useful in products requiring consistent sound output, thermal margin, and controlled behavior across different speaker loads.
Designers should pay attention to the 42-ball DSBGA layout, including ball pitch, exposed thermal requirements, via-in-pad or via-under-bump construction, and the PCB footprint specified by the manufacturer. The digital interface, boost configuration, speaker-sense connection, output routing, decoupling, and thermal management must be implemented according to the manufacturer datasheet and reference design.
This page consolidates verified manufacturer and distributor information, separates confirmed specifications from unavailable data, and provides practical application and sourcing guidance. It also identifies the absence of verified pin-to-pin substitute parts rather than presenting unverified replacements as drop-in choices.
直接替換替代品，適用於 TAS2557YZT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品TAS2557YZT 最大額定值與電氣特性
| Product Type | Digital-input mono Class-D smart amplifier |
| Output Power | 5.7 W |
| 輸出配置 | Mono |
| Amplifier Class | Class-D |
| Boost Architecture | Class-H boost |
| Boost Voltage | 8.5 V |
| Audio Input | Digital input |
| Speaker Protection | Integrated speaker protection |
| Equalization | Advanced EQ |
| Speaker Sensing | Supported |
| 封裝 | 42-pin DSBGA (YZ) |
| Package Type | DSBGA |
| Package Pin Count | 42 pins |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40°C to 85°C |
TAS2557YZT 42 pins 腳位配置指南
TAS2557YZT（42 pins 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： TAS2557YZT.
請參閱 資料表 以查看完整腳位配置。
典型應用
TAS2557YZT 適用於 6 應用s: Bluetooth Portable Speaker, Smart Speaker Audio Module, Mobile Audio Accessory, Consumer Electronics Speaker, Digital Audio Dongle, Industrial Audible Alert Device.
Bluetooth Portable Speaker
The TAS2557YZT fits a battery-powered Bluetooth speaker because it accepts digital audio, delivers 5.7 W of mono Class-D output, and includes integrated speaker protection and sensing. Its 8.5 V Class-H boost can increase the drive voltage available to the speaker when the battery rail is lower than the required output swing. The Bluetooth module can feed the digital input while the smart amplifier controls EQ and protection behavior. This integration reduces the need for a separate Class-D amplifier and analog speaker-path circuitry, although the final layout still requires careful DSBGA escape routing, local decoupling, output routing, and thermal validation for the selected speaker impedance.
推薦
Smart Speaker Audio Module
The TAS2557YZT is suitable for a smart speaker module where a digital processor must drive one compact loudspeaker with controlled acoustics. Its advanced EQ can be used to shape system response, while speaker sensing and integrated protection support safer operation when the acoustic load changes. The 5.7 W output rating provides a defined Class-D power target without requiring an external analog output stage. The 8.5 V Class-H boost may improve useful speaker drive from a lower-voltage supply, but designers must account for boost power, thermal rise, and the 42-pin DSBGA footprint rather than treating the module as a conventional SOIC amplifier.
推薦
Mobile Audio Accessory
The TAS2557YZT can serve as the output stage in a mobile audio accessory that receives digital sound from a host processor or wireless audio device. Its digital input avoids an external DAC-to-analog conversion stage, while the 5.7 W mono Class-D output is appropriate for a compact single-speaker enclosure. Integrated speaker protection is valuable in portable products where mechanical shock, wiring variation, or accidental overload can affect the transducer. The system designer should verify speaker impedance and thermal conditions across battery range, use the manufacturer layout for the 42-DSBGA package, and test the 20 pF capacitive-load condition unless the datasheet permits another configuration.
推薦
Consumer Electronics Speaker
The TAS2557YZT can drive a small mono speaker in compact consumer electronics where digital audio processing and amplifier control are already available. At 5.7 W, it provides more output capability than a conventional low-power analog amplifier while retaining Class-D efficiency. Advanced EQ can compensate for the acoustic response of a compact enclosure, and the integrated protection functions simplify the output path. The 8.5 V Class-H boost should be configured according to the reference design so that the amplifier does not add unnecessary power loss or heat during normal operation. Sound quality and thermal performance must be validated together because the package and speaker load jointly influence allowable dissipation.
推薦
Digital Audio Dongle
The TAS2557YZT is appropriate for a digital audio dongle that converts a digital source into loudspeaker output in a restricted enclosure. Direct digital input shortens the signal path and supports programmable EQ, while the 5.7 W mono Class-D stage is suitable for a compact transducer. Integrated speaker protection can reduce the external component count and improve robustness in portable accessories. Class-H boost may help a low-voltage battery deliver the output swing needed by the speaker, but boost efficiency and thermal dissipation depend on signal level and load. Engineers should use the official 42-ball land pattern, minimize output-loop area, and verify acoustics and stability in the final mechanical assembly.
推薦
Industrial Audible Alert Device
The TAS2557YZT can provide a controlled mono audio output for an industrial audible-alert or notification device driven by a digital control system. Its programmed EQ can standardize alert tone or voice playback across a product family, while integrated speaker protection and sensing improve behavior when the loudspeaker connection changes. The 5.7 W Class-D output is suitable for a compact speaker, although continuous alert playback should be evaluated against the device's thermal limits. The 42-pin DSBGA package demands advanced assembly capability and exact manufacturer-recommended PCB geometry. Industrial qualification status, electromagnetic behavior, and the operating temperature envelope must be checked against the product requirement rather than inferred from the amplifier category.
推薦
推薦產品摘要
工程參考資料，適用於 TAS2557YZT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Package | 42-pin DSBGA (YZ) |
| Brand | Texas Instruments |
| Output Power | 5.7 W |
| Output Configuration | Mono |
| Amplifier Class | Class-D |
| Input Type | Digital input |
| Boost Architecture | Class-H boost |
| Boost Voltage | 8.5 V |
| Speaker Protection | Integrated |
| Equalization | Advanced EQ |
| Operating Temperature | -40°C to 85°C |
| Verified Reference Price as of 2026-10-28 | $5.3356 per unit |
主要差異化特點
- Integrated smart-audio functions (對比Conventional basic mono Class-D amplifier)
- Class-H boost capability (對比Fixed-rail Class-D amplifier)
- Digital signal path (對比Analog-input Class-D amplifier)
設計說明
Use the official Texas Instruments 42-pin DSBGA (YZ) land pattern and reference layout without substituting a generic BGA footprint. The supplied data confirms 42 pins but does not provide the complete ball map, so pad dimensions, solder-mask geometry, via-in-pad or via-under-bump construction, and ball assignments must be taken directly from the manufacturer drawings. Confirm assembly capability and inspect the first article for bridging, open balls, and package alignment before validating acoustic performance.
Validate the boost supply path and local decoupling against the manufacturer application design because Class-H operation can increase both output voltage and power stress relative to a fixed-rail Class-D stage. Start with the TI reference schematic and follow its component placement and trace-width guidance. Keep the switching and output loops compact, provide adequate energy-storage capacitance at the device, and verify cold-start behavior, current limit, and supply droop across battery voltage, temperature, and maximum audio-output conditions.
Evaluate thermal performance using the final speaker impedance, maximum continuous signal level, boost activity, and PCB copper rather than the 5.7 W headline value alone. The verified data provides the -40°C to 85°C operating-temperature range but does not provide a package-specific thermal-resistance value, so a junction-temperature calculation cannot be completed without additional manufacturer data. Use the official thermal information and confirm the assembled enclosure's temperature rise during sustained high-level playback.
Preserve clean digital input routing and a compact Class-D output loop. Keep the digital audio trace away from speaker-drive and boost-switching nodes, maintain continuous ground references beneath the DSBGA where the layout permits, and place input, output, and bypass capacitors at the pins identified by the reference design. The verified data notes a 20 pF lumped capacitive-load limit on output pins unless otherwise specified, so output routing and probe arrangements should be checked against that test condition.
Do not treat a generic Class-D amplifier with a similar wattage as a drop-in substitute for the TAS2557YZT. Exact replacement requires the same 42-pin DSBGA footprint, digital interface, I/O voltage requirements, boost behavior, EQ and protection implementation, and thermal layout. Likewise, do not infer that the TAS2557YZR ordering suffix is interchangeable with TAS2557YZT without comparing the official package and pin tables. In-stock claims and lead times should also be reconfirmed because distributor inventory changes after the 2026-10-28 verification.
合規資訊
The supplied verified excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The operating-temperature range is -40°C to 85°C, but it does not by itself establish automotive qualification.
