Monolithic Power Systems Inc. MPQ7790GF-AEC1-P

Overview

MPQ7790GF-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade-1 qualified, mono bridge-tied load (BTL) Class-D audio amplifier delivering 15W into 8Ω at 16V PVCC with ≤0.05% THD+N, 90% efficiency, and integrated 300mΩ MOSFETs. It operates from 5.5–18V PVCC, features adjustable power limiting, automatic shutdown on zero-input detection, and EMI-reduction architecture for automotive infotainment systems.

For engineers reviewing the MPQ7790GF-AEC1-P datasheet, MPQ7790GF-AEC1-P pinout, MPQ7790GF-AEC1-P application in e-call or telematics, or MPQ7790GF-AEC1-P equivalent for AEC-Q100 mono BTL amplifiers, this page provides verified functional context, validated pin roles, real-world thermal and EMI mitigation design meaning, and confirmed automotive-grade substitution options.

Technical Context

The MPQ7790GF-AEC1-P implements a fixed-frequency (240–360 kHz) PWM-based Class-D topology with dual half-bridge outputs (SWA/SWB) driving a single speaker in BTL configuration. Its internal gate drivers use bootstrap circuits (BSTA/BSTB) to fully enhance high-side N-MOSFETs, enabling rail-to-rail output swing while maintaining <40 ns dead time to prevent shoot-through.

It integrates analog input biasing (2.5V common-mode), programmable gain (20–36 dB via GAIN0/GAIN1), and system-level protection including over-current (±4.5A peak), thermal shutdown (150°C trip, 130°C hysteresis), and open-drain /FAULT reporting. The PLIMIT pin sets a "virtual rail" (VP-P ≈ 9 × V_PLIMIT) to constrain peak output voltage independent of PVCC.

Key Specifications

Pinout & Package

The MPQ7790GF-AEC1-P is housed in a thermally enhanced TSSOP-20 EP package with exposed pad for PCB-level heat dissipation (θ_JA = 40°C/W on 4-layer board). Pin numbering follows standard TSSOP convention (pin 1 at top-left corner, counterclockwise).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5414QRTQRQ1 and MAX9877EUP+T, the MPQ7790GF-AEC1-P uniquely combines AEC-Q100 Grade-1 certification, integrated 15W BTL output, zero-input auto-shutdown, and EMI-optimized fixed-frequency operation in a thermally efficient TSSOP-20 EP package-making it the only drop-in solution for space- and reliability-constrained automotive telematics audio nodes.

Availability

MPQ7790GF-AEC1-P is available at Aetrix Electronics and suitable for automotive E-Call systems, telematics head units, ADAS voice alert modules, and passenger cabin intercoms requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MPQ7790GF-AEC1-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 power management ICs, with core expertise in DC/DC converters, LED drivers, motor drivers, and Class-D audio amplifiers.

The MPQ7790 belongs to MPS's automotive-grade Class-D amplifier product line, designed specifically for AEC-Q100-compliant infotainment and safety-critical voice systems requiring low EMI, high efficiency, and robust thermal protection in compact packages.

FAQ

What is the purpose of the Cap_D pin and how is its timing calculated?

The Cap_D pin sets the delay time before the MPQ7790GF-AEC1-P asserts the In Absence flag and shuts down after detecting zero input signal. A capacitor connected from Cap_D to AGND determines hold time using T_delay = 1.6 × 10⁸ × C (seconds). For example, a 100 nF capacitor yields ~16 seconds of grace period before auto-sleep, allowing brief audio gaps without premature shutdown.

How does the PLIMIT function protect the speaker and amplifier?

The PLIMIT pin configures a "virtual voltage rail" (V_P-P ≈ 9 × V_PLIMIT) that caps maximum output swing independently of PVCC. This prevents clipping-induced distortion and limits RMS power delivered to the speaker, avoiding thermal damage to voice coils and reducing MOSFET conduction losses during sustained high-output conditions.

Can the MPQ7790GF-AEC1-P drive a 4Ω speaker, and what is the rated output power?

Yes, the MPQ7790GF-AEC1-P drives 4Ω loads with up to 7.5W output at 12V PVCC and 10% THD+N. At 16V, it delivers 10W into 4Ω. Derating is required due to higher current demand: peak output current remains ±4.5A, but thermal limits reduce usable continuous power compared to 8Ω operation.

What is the significance of separate PGND and AGND pins?

PGND (pins 2, 19) carries high-current switching return paths from the power MOSFETs, while AGND (pin 8) serves as the quiet reference for analog inputs, bias circuits, and internal references. Separating them prevents switching noise coupling into the audio signal path, directly improving THD+N and SNR performance in noisy automotive environments.

Does the MPQ7790GF-AEC1-P require external bootstrap diodes?

No. The MPQ7790GF-AEC1-P integrates internal bootstrap charging circuits for both BSTA and BSTB pins. Only external ceramic capacitors (e.g., 100 nF X7R) between BSTA–SWA and BSTB–SWB are required to supply gate drive current - eliminating diodes, saving board space, and improving reliability.

How does the /FAULT pin behave during thermal shutdown?

During thermal shutdown (die temperature >150°C), the /FAULT pin pulls low via its open-drain structure and all output MOSFETs turn off. Normal operation resumes only after die temperature falls below 130°C (20°C hysteresis), followed by a full soft-start sequence - preventing audible pops and ensuring safe restart without host MCU intervention.

What is the recommended LC filter configuration for EMI compliance?

MPS recommends a second-order LC filter per output (SWA/SWB) using high-impedance, high-current magnetic beads (e.g., Murata NFZ2M series) in series with 66 µH inductors and 1 µF X7R capacitors to AGND. This configuration attenuates 300 kHz switching harmonics by >40 dB, meeting CISPR 25 Class 5 radiated emissions requirements for automotive applications.