Monolithic Power Systems Inc. MP7747DQ-LF-P

Overview

MP7747DQ-LF-P from Monolithic Power Systems is a mono 20W Class D audio amplifier with integrated 250mΩ N-channel MOSFETs, programmable undervoltage protection (UVP), and single-ended output architecture delivering 20W into 4Ω at VDD=24V. It operates from 9.5V–36V, achieves 91% efficiency at full output, and integrates startup/shutdown pop elimination for clean speaker activation in flat-panel TVs and docking stations.

For engineers reviewing the MP7747DQ-LF-P datasheet, MP7747DQ-LF-P pinout, MP7747DQ-LF-P application, or MP7747DQ-LF-P equivalent, key selection criteria include its 10-pin QFN3×3 package, THD+N of 0.02% at 1W/8Ω, thermal shutdown at 150°C, and AAM™ modulation enabling high-fidelity audio with low EMI in space-constrained consumer electronics.

Technical Context

The MP7747DQ-LF-P implements Monolithic Power Systems' proprietary Analog Adaptive Modulation (AAM™) topology-a variable-frequency switching scheme that maintains linearity and fast transient response without external clock synchronization. Its differential input stage accepts signals referenced to VDD/2 (via internal PIN reference), and the modulator drives an integrated half-bridge output stage.

Startup pop elimination is implemented via a programmable slew-rate-controlled current source tied to the Timer pin, while shutdown behavior is governed by UVP threshold (default 8.4V rising) and active-high EN control with 1.4V turn-on threshold. Protection includes cycle-by-cycle short-circuit limiting (4.5A) and thermal shutdown with 30°C hysteresis.

Key Specifications

Pinout & Package

MP7747DQ-LF-P is housed in a thermally enhanced 10-pin QFN3×3 mm package with exposed thermal pad. The package complies with JEDEC MO-229 VEED-5 and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5707PAP and TPA3110D2PWPR, MP7747DQ-LF-P uniquely combines mono 20W analog-input capability, programmable UVP, Timer-configurable pop elimination, and minimal 10-pin QFN footprint-making it optimal for analog-source, space-constrained, single-channel consumer audio.

Availability

MP7747DQ-LF-P is available at Aetrix Electronics and suitable for flat panel televisions, portable docking stations, and multimedia computers requiring stable component supply, RoHS-compliant packaging, and production-ready lead times.

Supply support for MP7747DQ-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 mixed-signal ICs for power management and audio applications.

The MP7747 belongs to MPS' Class D Audio Amplifier product line, engineered for high-efficiency, low-EMI, single-chip audio solutions in consumer electronics where board space, thermal headroom, and acoustic fidelity are tightly constrained.

FAQ

What is the minimum recommended LC filter cutoff frequency for MP7747DQ-LF-P?

The LC filter characteristic frequency should be set between 30kHz and 50kHz to pass full 20kHz audio bandwidth while attenuating switching noise. For a 4Ω load, use Q ≈ 0.7–1.0; typical values are 10µH inductor with 100nF film capacitor. Layout must minimize SW node loop area to suppress EMI.

Can MP7747DQ-LF-P drive an 8Ω speaker at full rated power?

No-it delivers 10.6W into 8Ω at THD+N=10%, not 20W. The 20W rating is specified only for 4Ω loads at VDD=24V. Driving 8Ω at higher voltages risks exceeding absolute maximum ratings; operation remains safe within 9.5–36V, but output power scales with load impedance.

How does the Timer pin affect startup behavior?

The Timer pin controls the slew rate of the internal pop-elimination current source. A 2.2µF capacitor yields ~20mA/350ms ramp, minimizing turn-on pop. Larger capacitance reduces slew rate further; values below 312nF risk excessive inrush and audible artifacts. No capacitor disables controlled startup.

Is the UVP function active during normal operation or only at power-up?

UVP monitors VDD continuously during operation. If VDD drops below the programmed threshold (e.g., 8.4V default), the device shuts down immediately-even mid-playback-to prevent pop and protect downstream components. Recovery requires VDD to exceed threshold plus hysteresis (0.3V).

What is the purpose of separating AGND and PGND, and how should they be connected?

AGND carries low-level analog reference and input currents; PGND handles high di/dt switching return paths. They must be joined at a single point-ideally near the bulk VDD bypass capacitor-to prevent switching noise from coupling into the analog input path and degrading THD+N performance.

Does MP7747DQ-LF-P support differential input configuration?

Yes-it accepts fully differential inputs via PIN (internal VDD/2 reference) and NIN (inverting input). The non-inverting input is internally fixed; external signal is applied differentially across PIN–NIN. This configuration rejects common-mode noise and improves PSRR, especially critical in noisy digital systems like multimedia computers.

What thermal derating applies above +85°C ambient temperature?

With θ_JA=50°C/W, maximum continuous power drops linearly: at +100°C ambient, max power = (150°C – 100°C)/50°C/W = 1.0W. Above +85°C, PCB copper area and airflow become critical; use exposed pad soldering and thermal vias to improve θ_JA toward 35°C/W for higher sustained output.