MP7751GF-Z - 2x20W Stereo Class-D Audio Amplifier | MPS
MPN： MP7751GF-Z ✓ 啟用中MP7751GF-Z 概覽
A Class-D audio amplifier is a switching power amplifier within the broader audio-amplifier and power-management semiconductor hierarchy. Instead of continuously dissipating a signal through linear output devices, it uses efficient switching stages to drive a speaker load. The MP7751 uses a bridge-tied-load topology, which means each speaker is connected between two switching outputs rather than to ground. This improves output-voltage utilization and can provide substantial audio output from a compact integrated circuit.
Key verified features include a 5 V to 26 V supply range, stereo operation, 20 W per channel at 18 V into 8 ohms, and a fixed switching-frequency implementation. The integrated 240 mΩ power MOSFETs reduce external component count, while short-circuit protection improves robustness in speaker-drive applications. The exposed thermal pad supports heat transfer through the PCB, although thermal design must account for the amplifier dissipation and copper area.
The MP7751GF-Z is positioned for analog audio systems requiring compact stereo amplification, including powered speakers, consumer audio equipment, small multimedia systems, and portable or compact audio products. Compared with a discrete MOSFET output stage, the integrated amplifier simplifies layout and reduces component count. Compared with a higher-power external amplifier, the MP7751 is appropriate when the required speaker load is near 20 W per channel and the available supply is within its verified operating range.
The main design consideration is power-thermal management. Class-D efficiency does not eliminate heat: output-stage loss still depends on supply voltage, load impedance, output power, switching characteristics, and copper thermal resistance. Layout should follow the manufacturer datasheet exactly, preserve the exposed-pad connection, keep switching loops compact, and provide adequate input filtering. Speaker wiring should remain short and separated from sensitive analog input routing to reduce EMI pickup and pop artifacts.
This page combines verified manufacturer and distributor information with practical guidance on analog-input filtering, exposed-pad thermal design, speaker protection, and application selection. Pricing and availability must be checked as of 2026-10-22 because distributor inventory and terms can change without notice.
直接替換替代品，適用於 MP7751GF-Z — 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MP7751GF-Z 最大額定值與電氣特性
| Product Type | Stereo analog-input Class-D audio amplifier |
| Channel Configuration | 2-channel stereo |
| Supply Voltage Range | 5 V to 26 V |
| Rated Output Power | 2 x 20 W into 8 Ω at 18 V supply |
| Output Topology | Bridge-tied-load (BTL) |
| 切換頻率 | Fixed frequency |
| Integrated Power MOSFET Resistance | 240 mΩ |
| Protection | Short-circuit protection |
| Pop Reduction | Start-up and shutdown pop elimination |
| EMI Feature | Advanced EMI performance |
| 封裝 | 28-pin TSSOP-EP |
| 安裝類型 | Surface mount |
| Exposed Thermal Pad | Yes |
| Input Type | Analog input |
| DigiKey Category | Audio Amplifiers |
| Mouser Description | 26 V, 2 x 20 W stereo BTL Class-D audio amplifier |
| DigiKey Packaging Description | 28-TSSOP-EP |
MP7751GF-Z 28-pin tssop-ep 腳位配置指南
MP7751GF-Z（28-pin tssop-ep 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： MP7751GF-Z.
請參閱 資料表 以查看完整腳位配置。
典型應用
MP7751GF-Z 適用於 6 應用s: Compact Powered Speakers, Stereo Multimedia Equipment, Consumer Audio Products, Small Audio Amplifier Modules, Portable Battery-Powered Audio, Industrial Control-Cabinet Audio.
Compact Powered Speakers
The MP7751GF-Z fits compact powered-speaker designs requiring two analog audio channels and approximately 20 W per channel. Its 2 x 20 W capability is verified at 18 V into 8-ohm speakers, while the integrated 240 mΩ power MOSFETs reduce the number of external output components. The 28-pin TSSOP-EP package still requires careful exposed-pad layout and a low-impedance supply rail. In a typical implementation, analog left and right signals enter the amplifier, and each BTL output drives an 8-ohm speaker. The main trade-off is thermal headroom: 20 W audio output does not mean the IC dissipates no heat, so copper area and supply capability should be validated at the intended volume and frequency.
推薦
Stereo Multimedia Equipment
The MP7751GF-Z is suitable for analog stereo audio blocks in multimedia equipment because it provides two channels, 5 V to 26 V operation, and fixed-frequency Class-D output. The verified 20 W per channel rating supports speakers or speaker networks in compact desktop and living-room products. Its pop-elimination features help improve startup and shutdown behavior, while integrated short-circuit protection adds robustness. Designers should place input filtering and gain-setting components according to the datasheet and keep the switching output area isolated from sensitive analog traces. If the product uses a wall adapter, supply ripple and startup current should be checked so that the amplifier does not brown out during audio peaks.
推薦
Consumer Audio Products
The MP7751GF-Z can be used in compact consumer audio products where high integration and predictable speaker drive are valuable. Its integrated MOSFETs and protection functions reduce assembly content, while the BTL topology can improve use of the available supply voltage. The device is best matched to products requiring 20 W per channel at the verified operating condition rather than very high-power home-amplifier output. Layout quality will strongly affect EMI and thermal performance. Keep the high-current output loops compact, provide a continuous ground reference, and use the exposed pad as part of the heat-spreading path. Verify speaker impedance and maximum input signal level before finalizing the gain structure.
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Small Audio Amplifier Modules
The MP7751GF-Z is appropriate for small audio amplifier modules that expose analog line input and stereo speaker outputs. Its 2-channel architecture avoids requiring two separate amplifier packages, and the fixed-frequency Class-D implementation can simplify system integration compared with a discrete output stage. The 28-pin TSSOP-EP package supports compact designs when the PCB includes proper thermal copper and the module enclosure provides heat dissipation. Designers should evaluate whether the enclosure limits airflow or raises the ambient temperature enough to change the usable output level. Speaker wiring should be kept short and separated from input routing to minimize induced noise and improve electromagnetic compatibility.
推薦
Portable Battery-Powered Audio
The MP7751GF-Z can support battery-powered audio products when the available supply remains within the verified 5 V to 26 V range and the required speaker power is compatible with 20 W per channel at 18 V into 8 ohms. Class-D operation can improve efficiency compared with a linear amplifier, which is beneficial in portable equipment. However, the battery source, regulator efficiency, speaker sensitivity, and thermal path all affect usable runtime and output headroom. A battery design should include controlled shutdown behavior and protection against supply transients. Start-up and shutdown pop-elimination features help reduce audible disturbances, but analog input muting and speaker load constraints may still be needed at the system level.
推薦
Industrial Control-Cabinet Audio
The MP7751GF-Z may be used for low-power audio notification or monitoring functions in industrial equipment, provided the enclosure and PCB can handle its thermal output. The verified 2 x 20 W capability is useful for compact stereo annunciators, panel speakers, or operator audio, while short-circuit protection improves resilience. Industrial systems often have long speaker cables and shared ground paths, so cable routing and grounding deserve attention. The fixed-frequency Class-D output should be evaluated against the enclosure's EMI requirements, and the analog input should be filtered before entering the chip. Confirm temperature range, isolation, and regulatory requirements against the complete manufacturer datasheet and system standards.
推薦
推薦產品摘要
工程參考資料，適用於 MP7751GF-Z — 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 | 28-pin TSSOP-EP |
| Brand | Monolithic Power Systems |
| Channel Configuration | 2-channel stereo |
| Supply Voltage | 5 V to 26 V |
| Rated Output | 2 x 20 W into 8 Ω at 18 V |
| Output Topology | Bridge-tied-load |
| Power MOSFET Resistance | 240 mΩ integrated |
| Protection Features | Short-circuit protection; start-up and shutdown pop elimination |
主要差異化特點
- Integrated stereo Class-D output stage (對比Discrete MOSFET Class-D output stage)
- Verified high output for compact audio designs (對比Lower-power integrated audio amplifier)
- Integrated fault and transient features (對比Basic Class-D amplifier without the listed integration)
設計說明
Treat the exposed pad as a primary thermal path. Use the manufacturer datasheet's exposed-pad land pattern, provide uninterrupted ground-plane copper, and use vias to distribute heat into both sides of the PCB where appropriate. Estimate the junction-temperature rise from the calculated IC dissipation, board thermal resistance, and ambient temperature; do not assume that Class-D efficiency eliminates heat.
Keep the analog input traces, gain-setting network, and filtering components away from the high-current BTL output loops. Place input and bypass capacitors close to their associated pins, follow the datasheet's recommended component values, and route the output-current path with short, wide traces. Incorrect high-current layout can increase EMI, reduce reliability, and make pop or distortion worse.
Do not substitute an 8-ohm speaker requirement with an arbitrary impedance. Confirm that the supply, speaker load, output power, thermal conditions, and input signal level remain inside the manufacturer limits. Also verify the exposed-pad connection and all 28 package pins against the official MP7751 datasheet before releasing PCB artwork; the supplied search results do not include the complete numbered pin table.
合規資訊
The supplied verified web data does not state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 status. Compliance must be confirmed from current manufacturer documentation.
