Monolithic Power Systems Inc. MP1720DQ-6-LF-P

Overview

MP1720DQ-6-LF-P from Monolithic Power Systems is a mono Class-D audio amplifier delivering 2.7W into 4Ω at 10% THD+N with 5V supply, featuring pin-selectable 1MHz/1.3MHz switching frequency, 6dB fixed gain, 90% efficiency, and integrated 250mΩ MOSFETs. It operates in portable audio systems where low-EMI operation without output LC filter is required.

For engineers reviewing the MP1720DQ-6-LF-P datasheet, MP1720DQ-6-LF-P pinout, MP1720DQ-6-LF-P application, or MP1720DQ-6-LF-P equivalent, key selection criteria include differential input support, thermal shutdown behavior, pop suppression timing, and FCC-compliant radiated emissions performance with 24-inch unshielded cable.

Technical Context

The MP1720DQ-6-LF-P implements a fully differential BTL (bridge-tied load) Class-D architecture with internal sawtooth-based PWM modulation and comparator-driven gate control. Its oscillator supports three modes: internal 1.0MHz (CLK=GND), internal 1.3MHz (CLK=FLOAT), or external synchronization (CLK=clocked, 0.5–1.4MHz).

It integrates startup/pop suppression circuitry with 15ms controlled turn-on, low-noise biasing (53μV RMS, A-weighted), and dual protection mechanisms-thermal shutdown triggering at +125°C with hysteresis to +112°C, and cycle-by-cycle short-circuit detection on both high-side and low-side MOSFETs.

Key Specifications

Pinout & Package

MP1720DQ-6-LF-P is housed in a thermally enhanced 3mm × 3mm, 10-pin QFN package with exposed thermal pad (Pin 10) requiring PCB ground connection for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mono Class-D audio amplifier applications.

Compared with TAS5342AIDBTR and MAX9718ETA+, MP1720DQ-6-LF-P uniquely balances filterless FCC compliance, 90% efficiency, and QFN10 compactness - making it optimal for consumer portable designs where size, EMI, and battery life are co-constrained.

Availability

MP1720DQ-6-LF-P is available at Aetrix Electronics and suitable for smartphone audio subsystems, wireless headphone transmitters, portable media players, and tablet speaker drivers requiring stable component supply and long-term production continuity.

Supply support for MP1720DQ-6-LF-P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers across Asia and North America and global manufacturing partnerships.

The MP1720 product line targets space- and power-constrained portable audio applications, delivering Class-D fidelity with Class-AB noise performance and eliminating traditional EMI mitigation components.

FAQ

What is the recommended input coupling configuration for MP1720DQ-6-LF-P?

For differential sources biased between 900–940mV (typical for MP1720-6), input coupling capacitors are optional - direct DC-coupling preserves low-frequency response and eliminates capacitor-induced mismatch. For single-ended or out-of-range sources, use 1μF–10μF X7R ceramics with 15kΩ input impedance to set corner frequency below 20Hz.

Does MP1720DQ-6-LF-P require an output LC filter to meet EMC standards?

No. The MP1720DQ-6-LF-P's integrated EMI-reduction scheme and optimized edge-rate control allow it to pass FCC radiated emissions with 24-inch unshielded twisted-pair speaker cable and no external LC filter - verified per Rev. 1.02 datasheet test conditions.

How does the 6dB gain option affect maximum output power?

The 6dB gain (AV = 2.0 V/V typ.) enables 2.7W into 4Ω at 10% THD+N with 5V supply and differential input. With single-ended input, max output drops to 0.93W due to reduced effective input swing - confirming that differential drive is essential for full power capability.

What thermal management is required for continuous 2.7W operation?

At TA = +85°C, the QFN10 package achieves θJA = 50°C/W. To sustain 2.7W continuously, junction temperature must stay ≤ +125°C: TJ = 85°C + (2.7W × 50°C/W) = 220°C - exceeding limit. Therefore, derating to ≤1.5W or active airflow/PCB copper pour is required for full-power operation above +60°C ambient.

Can MP1720DQ-6-LF-P be synchronized to an external clock from a baseband processor?

Yes. The CLK pin accepts TTL-level external clocks from 0.5MHz to 1.4MHz. This allows synchronization with baseband SoC clocks to avoid heterodyne interference in cellular handsets - confirmed in datasheet Table 1 and "CLK Operating Modes" section.

What happens during thermal shutdown, and how does recovery work?

When junction temperature exceeds +125°C, the device disables all MOSFETs and enters thermal shutdown. Operation resumes only after temperature falls below +112°C (13°C hysteresis), with a minimum 50μs lockout period to prevent cycling - ensuring robust protection during transient overload events.

Is the thermal pad (Pin 10) electrically connected to any internal node?

Yes. Pin 10 (PVIN / Thermal Pad) is internally connected to the VIN and PGND power rails and serves as the primary thermal and electrical return path for the H-bridge. It must be soldered to a solid PCB ground plane with ≥4 thermal vias for θJA = 50°C/W performance.