MP1720DH-3-LF-P - 2.7W Mono Class-D Amplifier | MPS
MPN: MP1720DH-3-LF-P ✓ ActiveMP1720DH-3-LF-P Overview
A Class-D audio amplifier is a switching power amplifier whose output stage rapidly switches between the supply rails. Compared with a linear Class-AB amplifier, this approach improves power efficiency because the output transistors spend more time in the low-dissipation states. The MP1720 adds EMI-reduction circuitry intended to suppress switching-related emissions without requiring an output LC filter.
The MP1720 provides five fixed-gain options, selectable according to the MP1720 ordering information, and the -3 variant identifies one of those gain configurations. Its switching frequency can be selected between 1 MHz and 1.3 MHz using a control pin or synchronized to an external clock source. These features support compact speaker designs where radiated emissions, audible artifacts, and supply-rail noise must be controlled simultaneously.
Internally, the full-bridge topology develops a differential speaker drive, removing the need for a DC-blocking output capacitor when the amplifier operates in Bridge-Tied-Load configuration. Short-circuit and thermal-overload protection are specified for the device. The exposed pad provides a thermal path from the amplifier to the PCB, making copper-pour area and thermal via layout important during continuous high-power playback.
Typical uses include portable speakers, consumer audio accessories, voice-enabled devices, sound bars, and compact Bluetooth speaker systems. It is particularly suitable where a 4-ohm load and moderate output power are required without introducing the heat and idle power associated with a Class-AB output stage. An external input coupling, output filtering, and speaker interface may still be required according to system-level EMI and safety requirements.
Designers should verify the -3 gain setting against the source impedance and preamp architecture, reserve sufficient input and output capacitors close to the device, and connect the exposed pad to a low-impedance ground plane. When radiated-emission testing fails, switching-frequency adjustment or synchronization should be evaluated before adding an output filter.
This page combines the verified distributor identity, the manufacturer MP1720 family information, package-level comparison data, same-family alternatives, and practical Class-D layout guidance. It is intended to help engineers identify sourcing, electrical-fit, and layout implications beyond the basic distributor listing.
Drop-in alternatives for MP1720DH-3-LF-P — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
MP1720DH-6-LF-P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MP1720DH-3-LF-Z
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MP1720DH-6-LF-Z
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MP1720DH-3-LF
✅ Drop-In📋 Reference alternative (not in catalog)
MP1720DH-6-LF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MP1720DH-3-LF-P Maximum Ratings & Electrical Characteristics
| Product Type | Mono Class-D audio amplifier IC |
| Channel Configuration | 1 channel (mono) |
| Maximum Output Power | 2.7 W into 4 ohm |
| Output Topology | Full-bridge |
| Switching Frequency Options | 1 MHz or 1.3 MHz |
| External Clock Synchronization | Supported |
| Gain Configurations | Five fixed options in the MP1720 family |
| EMI Reduction | Internal scheme designed to eliminate the need for an output LC filter |
| Short-Circuit Protection | Yes |
| Thermal-Overload Protection | Yes |
| Package | 10-MSOP-EP |
| Mounting Type | Surface mount |
| Exposed Thermal Pad | Yes |
MP1720DH-3-LF-P 10-msop-ep Pin Configuration Guide
Pin configuration for MP1720DH-3-LF-P (10-msop-ep 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-3-LF-P.
Refer to the datasheet for full pin configuration.
Typical Applications
MP1720DH-3-LF-P is suitable for 6 applications: Compact Bluetooth Speaker, USB and Desktop Speaker, Voice Assistant and Smart Speaker, Consumer Audio Accessory, Portable Powered Speaker, Sound Bar or Monitor Speaker Module.
Compact Bluetooth Speaker
The MP1720DH-3-LF-P fits a compact Bluetooth speaker because it provides up to 2.7 W into a 4-ohm load using an efficient full-bridge Class-D output stage. Its selectable 1 MHz or 1.3 MHz switching frequency gives the board designer a way to tune radiated emissions without immediately adding an output LC filter. The -3 fixed-gain option should be checked against the Bluetooth codec or DAC output level to avoid excessive amplification. During continuous playback, the exposed pad must be connected to a substantial ground plane and thermal vias so heat can leave the package.
Recommended
USB and Desktop Speaker
A USB or desktop speaker can use the MP1720DH-3-LF-P to convert a low-level analog audio signal into 2.7 W of mono Class-D output. The full-bridge arrangement drives a 4-ohm speaker efficiently and reduces the heat associated with linear amplification. The selectable operating frequency is useful when the amplifier shares a small enclosure with USB, wireless, or digital circuits that create narrowband interference peaks. Input filtering, source-impedance balancing, and correct gain selection are needed to preserve low distortion across the complete signal chain.
Recommended
Voice Assistant and Smart Speaker
The MP1720DH-3-LF-P is appropriate for voice-assistant and smart-speaker modules where a single 4-ohm driver must be driven efficiently from an analog codec output. Its 2.7 W capability provides useful acoustic output without requiring a larger external power amplifier, while the EMI-reduction features help limit switching-related interference in enclosed plastic housings. The designer must still budget input filtering for microphone coupling and keep the switched output node away from sensitive microphone lines. External clock synchronization can be valuable when multiple amplifiers share a system clock.
Recommended
Consumer Audio Accessory
For a consumer audio accessory, the MP1720DH-3-LF-P delivers 2.7 W into 4 ohms in a compact surface-mount package and avoids the continuous idle dissipation of a Class-AB output stage. Its full-bridge output is especially useful when the speaker wiring is short and the system can use a differential drive arrangement. The -3 gain configuration must be coordinated with the source volume control so loud passages do not clip the internal modulator. PCB testing should cover both conducted noise at the supply terminals and radiated emissions from the speaker cable.
Recommended
Portable Powered Speaker
The MP1720DH-3-LF-P can serve as the power stage in a portable powered speaker supplied from a rechargeable battery, provided the converter voltage leaves sufficient headroom for the amplifier's switching operation. Class-D efficiency reduces the heat generated during playback, allowing a compact exposed-pad footprint without an external heat sink in typical applications. Thermal verification should still use the actual copper area, ambient temperature, and continuous-output duty cycle. The switching-frequency control is useful when the amplifier shares a board with a radio or a high-speed digital interface.
Recommended
Sound Bar or Monitor Speaker Module
The MP1720DH-3-LF-P is suitable for a small sound-bar or monitor-speaker module where each channel drives a 4-ohm driver at up to 2.7 W. Using a shared 1 MHz or 1.3 MHz switching plan across multiple amplifiers can simplify EMI filtering, while external synchronization provides greater control when system-level timing matters. The board should separate the Class-D output return path from audio input grounding to minimize switching-current coupling. Mechanical design must also prevent speaker-cable movement from stressing the PCB or exposed-pad solder joints.
Recommended
Recommended Products Summary
Engineering reference data for MP1720DH-3-LF-P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MP1720DH-6-LF-P | MP1720DH-3-LF-Z | MP1720DH-6-LF-Z | MP1720DH-3-LF | MP1720DH-6-LF |
|---|---|---|---|---|---|---|
| Brand | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems |
| Package | 10-MSOP-EP | 10-MSOP-EP | 10-MSOP-EP | 10-MSOP-EP | 10-MSOP-EP | 10-MSOP-EP |
| Amplifier Class | Class D | Class D | Class D | Class D | Class D | Class D |
| Channel Configuration | Mono | Mono | Mono | Mono | Mono | Mono |
| Output Power into 4 Ohm | 2.7 W | 2.7 W | 2.7 W | 2.7 W | 2.7 W | 2.7 W |
| Fixed Gain Code | -3 | -6 | -3 | -6 | -3 | -6 |
| 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 |
| External Clock Synchronization | Supported | Supported | Supported | Supported | Supported | Supported |
| EMI Reduction | Internal scheme; output LC filter not generally required | Internal MP1720DH family scheme | Internal MP1720DH family scheme | Internal MP1720DH family scheme | Internal MP1720DH family scheme | Internal MP1720DH family scheme |
| 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
- Defined 2.7 W output into a 4-ohm load (vs MP1720DH-6-LF-P)
- EMI-conscious switching-frequency flexibility (vs MP1720DH-3-LF)
- Full-bridge mono output without a conventional output coupling capacitor (vs MP1720DH-6-LF-Z)
Design Notes
The 10-MSOP-EP exposed pad is the primary thermal path, so it must be soldered to a ground copper region rather than left isolated. Use multiple thermal vias where the PCB stack-up permits, and avoid placing a narrow thermal-via pattern under the pad. Continuous 2.7 W output is a worst-case thermal condition and should be checked against the final copper area, enclosure temperature, and speaker impedance. Because no datasheet thermal-resistance figure was supplied, engineers must use the manufacturer thermal data and their own board-level measurements rather than assume a fixed junction limit.
Keep the Class-D output loop and high-current supply return paths compact and isolated from the audio input. Place input and output components at the pins specified by the manufacturer application circuit, and route the exposed-pad vias directly into the ground plane. The MP1720 family offers 1 MHz or 1.3 MHz switching selection, so EMC testing should include both settings and any external synchronization mode used in production. This practical adjustment can resolve a narrow emission peak without adding a costly output LC filter.
Do not treat the -3, -6, -LF, -LF-P, and -LF-Z order-code differences as purely cosmetic. The numeric code identifies the fixed-gain option, while the remaining suffixes identify ordering or packaging variants. Verify the required gain against the source impedance and preamplifier, confirm the mechanical package, and confirm the required reel format before substitution. The verified excerpts establish the 10-MSOP-EP package but do not provide the complete pin table, so use the official MP1720 datasheet for signal names and exposed-pad connectivity.
Compliance Information
The verified excerpts identify the MP1720DH-3-LF-P as a Monolithic Power Systems Class-D audio amplifier but do not contain explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. Compliance must be confirmed from the current manufacturer declaration or product documentation.
