Monolithic Power Systems Inc. MP1720DH-216-LF-Z

Overview

MP1720DH-216-LF-Z from Monolithic Power Systems is a mono Class-D audio amplifier in MSOP-10EP package delivering 2.7W into 4Ω at 10% THD+N with 5V supply, featuring 21.6dB fixed gain, 90% efficiency, and integrated 250mΩ MOSFETs. It operates at 1MHz or 1.3MHz (pin-selectable), eliminates startup/shutdown pop via 15ms controlled ramp, and targets compact portable audio systems requiring low-EMI operation without output LC filters.

For engineers reviewing the MP1720DH-216-LF-Z datasheet, MP1720DH-216-LF-Z pinout, MP1720DH-216-LF-Z application, or MP1720DH-216-LF-Z equivalent, this device supports differential/single-ended input configurations, offers thermal/short-circuit protection, and enables FCC-radiated emissions compliance with 24-inch unshielded cable - critical for cellular phone, PDA, and MP3 player audio subsystem design.

Technical Context

The MP1720DH-216-LF-Z implements a fully differential BTL (bridge-tied load) Class-D architecture with internal PWM generation driven by a sawtooth oscillator. Its gain is fixed at 21.6dB (12.0× voltage gain), and input bias voltage is 465mV typical - optimized for high-sensitivity single-ended sources while maintaining noise rejection via differential mode capability.

Switching frequency is set via CLK pin: grounded for 1.0MHz, floating for 1.3MHz, or externally synchronized between 0.5–1.4MHz. The device integrates power MOSFETs with R_DS(on) = 250mΩ (at V_IN = 3.3V), enabling high-efficiency operation across 2.5–5.5V supply range while maintaining <53μV RMS output noise and >91dB SNR.

Key Specifications

Pinout & Package

MP1720DH-216-LF-Z uses an MSOP-10EP (exposed pad) package with 0.5mm pitch, requiring thermal pad soldering to PCB ground for thermal management. Package dimensions: 3mm × 3mm × 1.1mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPA2013D1RTJR and MAX9718ETA+, MP1720DH-216-LF-Z delivers superior EMI performance without external filtering, lower quiescent current, and guaranteed pop-free operation - making it optimal for ultra-compact, battery-sensitive designs where certification speed and acoustic reliability are critical.

Availability

MP1720DH-216-LF-Z is available at Aetrix Electronics and suitable for cellular phones, PDAs, MP3 players, and portable gaming devices requiring stable component supply, FCC-compliant audio amplification, and long-term lifecycle support.

Supply support for MP1720DH-216-LF-Z 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 in the US, China, and Taiwan, and global manufacturing partnerships.

The MP1720 product line delivers highly integrated, low-EMI Class-D audio amplifiers targeting portable consumer electronics where board space, battery life, and regulatory compliance are primary constraints.

FAQ

What is the recommended input configuration for MP1720DH-216-LF-Z in noisy environments?

For noisy environments, use differential input with DC bias within 0.2–1.9V range to maximize common-mode rejection. The device supports single-ended input via AC coupling, but differential mode provides >66dB CMRR and eliminates need for input capacitors - reducing component count and low-frequency noise amplification.

Does MP1720DH-216-LF-Z require an output LC filter to meet FCC emissions?

No. MP1720DH-216-LF-Z passes FCC radiated emissions standards with 24-inch unshielded twisted-pair speaker cable and no output LC filter, thanks to its internal EMI-reduction scheme and flexible 1.0/1.3MHz switching frequency selection - verified per MPS Rev. 1.02 test data.

How does the 21.6dB gain option affect system-level signal chain design?

The 21.6dB (12×) fixed gain allows direct interface with low-output DACs (e.g., 0.5V_RMS) to achieve full 2.7W output into 4Ω. It eliminates need for external gain stages, reduces noise contribution, and simplifies layout - but requires attention to input voltage limits: maximum SE input is 1.93V_PP to avoid clipping.

What thermal management is required for continuous 2.7W operation?

At 2.7W output, junction temperature rise is ~284°C/W × 2.7W ≈ 77°C above ambient. With θ_JA = 105°C/W (MSOP-EP), PCB must include ≥2 cm² copper pour tied to thermal pad. Derate output power above +60°C ambient; thermal shutdown activates at +125°C junction temperature.

Can MP1720DH-216-LF-Z be synchronized to an external clock, and what is the valid frequency range?

Yes. Drive CLK pin with TTL-compatible square wave between 0.5MHz and 1.4MHz. External synchronization shifts harmonic content away from sensitive bands (e.g., RF receivers), improving system-level EMI margin - confirmed in MPS functional block diagram and CLK operating modes table.

What protection features are integrated, and how do they behave during fault conditions?

MP1720DH-216-LF-Z integrates thermal shutdown (>125°C) and short-circuit protection. On fault, outputs disable immediately and remain off for ≥50μs before auto-recovery. Junction must cool to ≤112°C to resume operation - preventing latch-up and ensuring safe restart under intermittent overload.

Is the MSOP-10EP package RoHS-compliant and lead-free?

Yes. MP1720DH-216-LF-Z is lead-free and RoHS-compliant per MPS Product Compliance documentation. "LF-Z" suffix explicitly denotes lead-free, green packaging meeting EU Directive 2011/65/EU and JEDEC J-STD-609A standards.