Monolithic Power Systems Inc. MP1720DH-12-LF-Z

Overview

MP1720DH-12-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 fixed 12dB gain, 90% peak efficiency, and integrated 250mΩ MOSFETs. It operates in low-EMI mode without output LC filter and passes FCC radiated emissions with 24-inch unshielded cable - deployed in space-constrained portable audio systems requiring pop-free startup and thermal protection.

For engineers reviewing the MP1720DH-12-LF-Z datasheet, MP1720DH-12-LF-Z pinout, MP1720DH-12-LF-Z application, or MP1720DH-12-LF-Z equivalent, key selection criteria include its differential input architecture, 1.0/1.3MHz switchable frequency, shutdown current of 0.1μA, 15ms pop-suppression startup time, and compatibility with 2.5–5.5V supply rails in battery-powered handheld devices.

Technical Context

The MP1720DH-12-LF-Z implements a fully differential BTL (bridge-tied load) Class-D topology with internal PWM modulation driven by a sawtooth oscillator. Its clock input supports three modes: GND (1.0MHz), floating (1.3MHz), or external TTL synchronization (0.5–1.4MHz), enabling EMI spectral shaping to avoid sensitive bands.

It integrates startup/pop suppression circuitry that ramps bias voltages over 15ms, eliminates DC offset via matched input biasing (784mV typ. for 12dB variant), and embeds thermal shutdown (>125°C trip) and short-circuit protection with automatic recovery after ≥50μs fault hold-off.

Key Specifications

Pinout & Package

MP1720DH-12-LF-Z uses MSOP-10EP (3mm × 3mm, 0.5mm pitch) with exposed thermal pad soldered to PCB ground for thermal management. Package thermal resistance θ_JA = 105°C/W enables 1.2W continuous dissipation at +25°C ambient.

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-12-LF-Z uniquely combines filterless FCC compliance, differential input noise immunity, and integrated pop/thermal protection - making it optimal for space- and power-constrained portable audio where reliability and EMI margin are non-negotiable.

Availability

MP1720DH-12-LF-Z is available at Aetrix Electronics and suitable for cellular handsets, portable media players, wireless audio dongles, and smart wearables requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for MP1720DH-12-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 across Asia and North America and global manufacturing partnerships.

The MP1720 product line targets ultra-compact, battery-operated audio systems demanding high efficiency, low EMI, and robust protection - optimized for smartphones, wearables, and portable media where thermal headroom and PCB area are severely constrained.

FAQ

What is the recommended input configuration for MP1720DH-12-LF-Z in noisy environments?

For noisy environments such as cellular handsets with RF interference, the MP1720DH-12-LF-Z should be used with fully differential inputs. Its −66dB common-mode rejection ratio (CMRR) suppresses coupled noise, and the internal 784mV bias allows DC-coupled sources without input capacitors - reducing component count and low-frequency phase shift.

Does MP1720DH-12-LF-Z require an external LC filter to meet EMI standards?

No. The MP1720DH-12-LF-Z passes FCC radiated emissions standards with up to 24 inches of unshielded twisted-pair speaker cable and no external LC filter, thanks to its proprietary low-EMI modulation scheme and optimized gate drive timing - confirmed in MPS Application Note AN-107.

How does the 12dB gain option affect maximum input voltage and output power?

At 12dB gain, the MP1720DH-12-LF-Z accepts a maximum single-ended input of 2.568V_PP, delivering 2.62W into 4Ω at 10% THD+N with 5V supply. With differential input, it supports 5.136V_PP and achieves full 2.7W - verified in Table 2 of the Rev. 1.02 datasheet under SE vs. differential test conditions.

What thermal derating applies when using MP1720DH-12-LF-Z in MSOP-EP package?

In MSOP-10EP package, MP1720DH-12-LF-Z has θ_JA = 105°C/W. At +60°C ambient, maximum continuous power drops to ~0.85W before thermal shutdown triggers at 125°C junction temperature - requiring careful PCB copper area allocation beneath the thermal pad per MPS layout guidelines.

Can MP1720DH-12-LF-Z synchronize to an external clock, and what is the valid frequency range?

Yes. When CLK is driven by a TTL-compatible external clock, MP1720DH-12-LF-Z locks to frequencies from 500kHz to 1.4MHz. This enables EMI spectral spreading to avoid interference with Wi-Fi, Bluetooth, or display drivers - validated in Figure 12 of the datasheet's typical performance curves.

Is the shutdown function active-high or active-low, and what is its leakage behavior?

The SHDN pin is active-high: driving it ≥1.6V enables operation; ≤0.45V disables the device. Input leakage is ±1μA at 6.3V, ensuring minimal current draw in system-level power gating - critical for maintaining <1μA total system sleep current in modern portable designs.

What is the startup sequence behavior during pop suppression?

Upon SHDN transition from low to high, MP1720DH-12-LF-Z initiates a 15ms internal bias voltage ramp across both inputs and outputs. During this period, outputs remain in high-impedance state until bias settles - eliminating mechanical pop in speakers and confirmed by oscilloscope waveforms in Figure 7 of the datasheet.