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

Overview

MP1720DH-216-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 21.6dB fixed gain, 90% peak efficiency, and integrated 250mΩ MOSFETs. It operates in BTL mode with fully differential inputs, supports pin-selectable 1MHz/1.3MHz switching frequency or external clock synchronization, and eliminates startup/shutdown pop via 15ms controlled ramp-up - deployed in space-constrained portable audio systems requiring low-EMI operation without output LC filters.

For engineers reviewing the MP1720DH-216-LF-P datasheet, MP1720DH-216-LF-P pinout, MP1720DH-216-LF-P application, or MP1720DH-216-LF-P equivalent, key selection criteria include its 21.6dB gain configuration, MSOP-10EP thermal-pad package, 53μV typical input-referred noise at 3.3V, FCC-compliant radiated emissions performance with 24-inch unshielded cable, and shutdown current of 0.1μA for battery-sensitive designs.

Technical Context

The MP1720DH-216-LF-P implements a pulse-width modulation (PWM) Class-D architecture with a full-bridge BTL output stage, using internal sawtooth waveform comparison against differential input-derived complementary signals. Its oscillator supports three modes: internal 1.0MHz (CLK=GND), internal 1.3MHz (CLK=FLOAT), or external TTL-synchronized operation from 500kHz to 1.4MHz.

It integrates startup pop suppression via 15ms bias voltage ramping, thermal shutdown activation at +125°C with hysteresis (resumes at +112°C), and short-circuit protection that disables all MOSFETs upon overcurrent detection. Input common-mode range varies by gain option: for MP1720DH-216, VBIAS = 465mV (typ), enabling ±1.43Vpp maximum SE input before clipping.

Key Specifications

Pinout & Package

MP1720DH-216-LF-P uses the MSOP-10EP (exposed thermal pad) package, 3mm × 3mm footprint, with lead-free RoHS-compliant finish. The exposed pad must be soldered to a PCB ground plane for thermal and electrical integrity.

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-P uniquely combines 21.6dB gain, no-filter FCC compliance, external clock synchronization, and 53μV noise - making it optimal for next-gen portable audio where EMI, size, and signal integrity are co-constrained.

Availability

MP1720DH-216-LF-P is available at Aetrix Electronics and suitable for smartphone audio subsystems, wireless headphone drivers, portable media players, and IoT voice assistant speakers requiring stable component supply and long-term production continuity.

Supply support for MP1720DH-216-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, headquartered in Kirkland, WA, with global design and support centers.

The MP1720 product line targets ultra-compact, battery-efficient portable audio applications - designed to eliminate external filters, reduce thermal footprint, and simplify EMI certification for consumer electronics.

FAQ

What is the recommended input coupling configuration for MP1720DH-216-LF-P?

For MP1720DH-216-LF-P, differential input is strongly recommended due to its 465mV internal bias voltage - enabling direct connection to DC-biased sources without coupling capacitors. If using single-ended input, a 1μF–2.2μF X7R ceramic capacitor is required per input pin to block DC offset and prevent clipping, sized per f_IN = 1/(2π·15kΩ·C_IN) to maintain bass response.

Does MP1720DH-216-LF-P require an output LC filter for FCC compliance?

No. MP1720DH-216-LF-P passes FCC radiated emissions standards with up to 24 inches of unshielded twisted-pair speaker cable and zero external LC filtering - enabled by its proprietary low-EMI modulation scheme and optimized gate drive timing. This eliminates two inductors and two capacitors from the BOM and associated layout area.

How does the 21.6dB gain option affect maximum input voltage and output power?

With 21.6dB gain (12.0× V/V), MP1720DH-216-LF-P accepts ≤1.93Vpp single-ended input or ≤3.86Vpp differential input before clipping. At 5V supply and 4Ω load, it delivers 2.7W @ 10% THD+N - the highest power among MP1720 variants due to optimized gain-to-headroom ratio for low-sensitivity speakers.

What thermal management practices are required for MSOP-10EP package?

The MSOP-10EP package requires the exposed thermal pad to be soldered to a minimum 100mm² copper pour connected to PCB ground. With θ_JA = 105°C/W, continuous 2.7W output demands ≥2cm² thermal pad area and airflow or adjacent ground planes to maintain junction temperature below +125°C in sealed enclosures.

Can MP1720DH-216-LF-P synchronize to an external clock from a baseband processor?

Yes. The CLK pin accepts TTL-compatible external clocks from 500kHz to 1.4MHz. When driven by a baseband processor's audio clock (e.g., 1.024MHz), it shifts switching harmonics away from sensitive bands like GSM or Bluetooth, reducing system-level EMI coupling - confirmed in MPS Application Note AN045.

Is the shutdown function active-high or active-low?

SHDN is active-high: driving the pin ≥1.6V (min) enables the device; pulling it ≤0.45V (max) places MP1720DH-216-LF-P into 0.1μA shutdown mode. A pull-down resistor (e.g., 100kΩ) is recommended on SHDN to ensure defined state during power-up or host reset.

What is the startup time and how is pop suppressed?

MP1720DH-216-LF-P has a fixed 15ms startup delay after SHDN goes high. During this period, internal bias generators ramp output-stage common-mode voltage and input bias points simultaneously - eliminating transient imbalances that cause audible click/pop without requiring external mute control or software delays.