MP1720DH-9-LF-Z - 2.7W Mono Class-D Amplifier | MPS
MPN: MP1720DH-9-LF-Z ✓ ActiveMP1720DH-9-LF-Z Overview
A Class-D audio amplifier is a switching power amplifier that converts a differential analog input into a high-frequency bridge output. Within the semiconductor hierarchy, it belongs to the Class-D amplifier family, audio amplifier ICs, analog and mixed-signal integrated circuits, and broader power-management and signal-processing systems. Its full-bridge output eliminates the need for a speaker-output coupling capacitor when the supported drive conditions are met.
The MP1720 family provides selectable 1 MHz or 1.3 MHz switching frequencies and can be synchronized to an external clock source. Its integrated 250 mΩ power MOSFETs reduce external component count, while startup and shutdown pop elimination improves listening experience. The -9 suffix identifies the family's fixed-gain ordering option. Short-circuit and thermal-overload protection support robust operation in compact audio products.
The MP1720DH-9-LF-Z can deliver 2.7 W into a 4 Ω speaker. A listed source also reports 2.78 W output power, reflecting a rounded or differently stated test condition. Its 20 kHz bandwidth and low-EMI design make it suitable for audio products requiring compactness and reduced filter requirements, although actual distortion, thermal performance, and output power must be checked against the manufacturer's test conditions.
Typical uses include portable speakers, consumer audio accessories, compact soundbars, call-system speakers, and other low-voltage mono audio loads. The 10-MSOP exposed-pad package requires careful PCB layout for heat transfer, and the exposed pad must be connected to ground according to the manufacturer's land pattern and datasheet instructions.
A key design consideration is the relationship between supply voltage, speaker impedance, and heat dissipation. Although Class-D topology improves efficiency, output-stage losses still become heat in the exposed pad. Place input, output, ground, and decoupling connections for low-loop-area routing, while using the recommended switching frequency to balance EMI, filtering, and thermal performance.
This page combines manufacturer specifications, distributor availability, family-level drop-in alternatives, comparison data, and practical layout guidance. It distinguishes verified parameters from unavailable pricing, lead-time, and detailed pin-mapping information rather than filling gaps with unverified assumptions.
Drop-in alternatives for MP1720DH-9-LF-Z — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
MP1720DH-6-LF-Z
✅ Drop-In📋 Reference alternative (not in catalog)
MP1720DH-10-LF-Z
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MP1720DH-11-LF-Z
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MP1720DH-3-LF-Z
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MP1720DH-12-LF-Z
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MP1720DH-9-LF-Z Maximum Ratings & Electrical Characteristics
| Product Type | Mono Class-D audio amplifier |
| Output Configuration | 1 channel, full-bridge |
| Rated Output Power | 2.7 W into 4 Ω |
| Maximum Output Power | 2.78 W into 4 Ω |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Typical Efficiency | 90% |
| Bandwidth | 20 kHz |
| Switching Frequency Options | 1 MHz or 1.3 MHz |
| External Clock Synchronization | Supported |
| Integrated Power MOSFET Resistance | 250 mΩ at VIN = 3.3 V |
| Gain Configuration | Five fixed gain options |
| Protection Features | Short-circuit and thermal-overload protection |
| Pop Suppression | Startup and shutdown pop elimination |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | 10-MSOP with exposed pad |
| Package Dimensions | 3.00 mm width |
| Mounting Type | Surface mount |
MP1720DH-9-LF-Z 3.00 mm width Pin Configuration Guide
Pin configuration for MP1720DH-9-LF-Z (3.00 mm width package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for MP1720DH-9-LF-Z.
Refer to the datasheet for full pin configuration.
Typical Applications
MP1720DH-9-LF-Z is suitable for 6 applications: Portable Mono Speaker, Consumer Audio Accessory, Compact Soundbar Speaker Channel, Call-System Annunciator, Low-Voltage IoT Audio Node, Industrial Audible Alarm.
Portable Mono Speaker
The MP1720DH-9-LF-Z fits compact mono speakers because it combines a 2.7 W output rating at 4 Ω with approximately 90% typical efficiency in a 2.5 V to 5.5 V supply range. Its full-bridge topology drives the speaker differentially and can reduce output-component count compared with a conventional single-ended Class-AB arrangement. The selectable 1 MHz or 1.3 MHz switching frequency gives the designer flexibility for EMI optimization, while startup and shutdown pop elimination improves operation when the system repeatedly enters and leaves active mode. The exposed pad still requires a continuous ground plane and adequate copper area for heat dissipation.
Recommended
Consumer Audio Accessory
A 2.7 W Class-D stage is appropriate for small consumer audio accessories requiring more output than a conventional low-power linear amplifier can provide efficiently. The MP1720DH-9-LF-Z operates from 2.5 V to 5.5 V and delivers its rated output into a 4 Ω speaker, making it useful in compact products powered by rechargeable cells or low-voltage regulated rails. Its integrated 250 mΩ MOSFETs, selectable gain ordering option, pop suppression, and short-circuit protection reduce external circuitry. PCB implementation should preserve a short power loop and route sensitive input signals away from the switching outputs and exposed-pad region.
Recommended
Compact Soundbar Speaker Channel
The MP1720DH-9-LF-Z can provide 2.7 W into a 4 Ω driver for a compact soundbar or similarly space-constrained multi-speaker product. Its high-efficiency Class-D architecture helps contain heat compared with a comparable Class-AB output stage, while the 10-MSOP exposed-pad package supports compact placement when adequate copper is provided. The selectable 1 MHz or 1.3 MHz carrier allows optimization against conducted and radiated emissions in the finished enclosure. External clock synchronization can also support coordinated switching in multi-channel systems, although channel layout and filter requirements must be evaluated at the system level.
Recommended
Call-System Annunciator
The MP1720DH-9-LF-Z is suitable for call-system speakers and announcement modules that require consistent mono audio from a low-voltage supply. Its 2.7 W capability at 4 Ω provides useful headroom for compact ceiling or wall-mounted transducers, and its short-circuit and thermal-overload protection adds resilience in continuously powered installations. The fixed -9 gain option should be matched to the microphone or line-level source so that the amplifier does not clip during normal speech peaks. Pop elimination improves transitions when the system enables or disables the announcement channel, while the exposed pad must remain thermally coupled to the PCB ground pour.
Recommended
Low-Voltage IoT Audio Node
The MP1720DH-9-LF-Z can serve as the speaker-driving element in a low-voltage IoT audio node because its 2.5 V to 5.5 V operating range covers common regulated supply systems. A 2.7 W output at 4 Ω is suitable for compact notification or monitoring transducers, while approximately 90% efficiency limits supply dissipation in battery- or USB-powered designs. The device supports selectable carrier frequencies and external synchronization, which can help manage EMI in small, densely packaged products. The fixed gain choice must be coordinated with the digital audio source, and output idle current and total efficiency should be evaluated under the product’s real duty cycle.
Recommended
Industrial Audible Alarm
The MP1720DH-9-LF-Z can drive a 4 Ω audible alarm in compact industrial equipment while operating from a low-voltage rail. Its 2.7 W output capability, full-bridge topology, short-circuit protection, and thermal-overload protection provide a practical foundation for robust alarm modules. The 90% typical efficiency reduces thermal stress compared with a linear amplifier of similar output power, although the exposed-pad copper area remains important. The -9 fixed-gain option should be verified against the alarm signal level to avoid distortion, and the switching frequency should be selected after checking enclosure emissions and any required output filtering.
Recommended
Engineering reference data for MP1720DH-9-LF-Z — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MP1720DH-6-LF-Z | MP1720DH-10-LF-Z | MP1720DH-11-LF-Z | MP1720DH-3-LF-Z | MP1720DH-12-LF-Z |
|---|---|---|---|---|---|---|
| Brand | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems |
| Package | 10-MSOP with exposed pad | 10-MSOP with exposed pad | 10-MSOP with exposed pad | 10-MSOP with exposed pad | 10-MSOP with exposed pad | 10-MSOP with exposed pad |
| Rated Output Power | 2.7 W into 4 Ω | 2.7 W into 4 Ω | 2.7 W into 4 Ω | 2.7 W into 4 Ω | 2.7 W into 4 Ω | 2.7 W into 4 Ω |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Typical Efficiency | 90% | 90% for the MP1720 family | 90% for the MP1720 family | 90% for the MP1720 family | 90% for the MP1720 family | 90% for the MP1720 family |
| Output Architecture | Full-bridge Class-D | Full-bridge Class-D | Full-bridge Class-D | Full-bridge Class-D | Full-bridge Class-D | Full-bridge Class-D |
| Switching Frequency Options | 1 MHz or 1.3 MHz | 1 MHz or 1.3 MHz | 1 MHz or 1.3 MHz | 1 MHz or 1.3 MHz | 1 MHz or 1.3 MHz | 1 MHz or 1.3 MHz |
| Fixed Gain Option | -9 ordering option | -6 ordering option | -10 ordering option | -11 ordering option | -3 ordering option | -12 ordering option |
| Integrated MOSFET Resistance | 250 mΩ at VIN = 3.3 V | 250 mΩ at VIN = 3.3 V | 250 mΩ at VIN = 3.3 V | 250 mΩ at VIN = 3.3 V | 250 mΩ at VIN = 3.3 V | 250 mΩ at VIN = 3.3 V |
| Protection Features | Short-circuit and thermal-overload protection | Short-circuit and thermal-overload protection | Short-circuit and thermal-overload protection | Short-circuit and thermal-overload protection | Short-circuit and thermal-overload protection | Short-circuit and thermal-overload protection |
Key Differentiators
- Verified same-family alternative with a documented web result (vs MP1720DH-6-LF-Z)
- Closest gain-order alternative preserves the core power specifications (vs MP1720DH-10-LF-Z)
- Integrated switching stage reduces solution size (vs MP1720DH-11-LF-Z)
- EMI-oriented carrier selection (vs MP1720DH-12-LF-Z)
Design Notes
The 10-MSOP exposed pad is the amplifier's primary thermal path and must be soldered according to the manufacturer's land pattern. Provide uninterrupted PCB copper beneath the pad and connect that copper to the ground plane with minimal thermal resistance. Do not estimate maximum junction temperature from package name alone; use the datasheet thermal model together with the actual PCB area, copper layers, enclosure airflow, supply voltage, output power, and speaker impedance.
Place the input and output network close to their associated pins, and keep the Class-D output routes away from the audio input to reduce differential pickup. The exposed pad and output-current loop should use broad, short copper paths because switching current rises rapidly. Use the selected 1 MHz or 1.3 MHz carrier with the manufacturer reference layout, and evaluate the finished product for conducted and radiated emissions before deciding whether an additional output filter is necessary.
A physically compatible MP1720 suffix variant may require different fixed gain, so footprint compatibility alone does not guarantee acoustically identical operation. Before substituting, compare the gain option, input configuration, supply limits, exposed-pad connection, switching-frequency control, and enable behavior in the current family datasheet. Also confirm that the replacement ordering code is a real, orderable configuration rather than an inferred suffix.
Design the supply path for Class-D switching current rather than only average audio power. Use the manufacturer's recommended input and bypass capacitance, provide a low-impedance ground return, and verify startup behavior at the lowest intended supply voltage. Although the family reaches approximately 90% efficiency, the load, carrier frequency, signal level, and idle state determine actual power draw and thermal load.
Compliance Information
The supplied excerpts identify the active MP1720DH-9-LF-Z product and its electrical characteristics but do not provide definitive part-specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. One aggregator mentions ROHS3, but that statement was not used because it is not an authoritative manufacturer or distributor compliance declaration.
