Monolithic Power Systems Inc. MP7752GF

Overview

MP7752GF from Monolithic Power Systems is a stereo, inductorless Class-D audio amplifier in TSSOP-28 EP package, delivering 15W per channel into 8Ω at 16V supply with fixed 260–360kHz switching frequency. It integrates 240mΩ MOSFETs, supports BTL speaker drive, features adjustable power limiting, automatic shutdown on zero-input detection, and meets CISPR22 Class B EMI without external inductors - used in compact TV and active speaker audio subsystems.

For engineers reviewing the MP7752GF datasheet, MP7752GF pinout, MP7752GF application, or MP7752GF equivalent, key selection considerations include its 5–18V single-supply operation, ±5A peak output current, 90% efficiency at 12V/8Ω, thermal/short-circuit protection, and differential input architecture for noise rejection in space-constrained consumer audio designs.

Technical Context

The MP7752GF implements a fixed-frequency, stereo bridge-tied-load (BTL) Class-D topology with integrated N-channel MOSFET half-bridges per channel and bootstrap gate drive circuitry. Its 260–360kHz PWM carrier enables compact EMI filtering using magnetic beads and capacitors instead of bulky inductors.

It features dual gain-select inputs (GAIN0/GAIN1) setting closed-loop gain from 20dB to 36dB, an adjustable PLIMIT pin controlling output voltage via duty-cycle clamping (virtual rail = 9 × V_PLIMIT), and open-drain /FAULT and InAbsence outputs for system-level fault reporting and power management.

Key Specifications

Pinout & Package

TSSOP-28 EP package with exposed thermal pad (EP) for enhanced heat dissipation; 0.65mm pitch, 9.7mm × 4.4mm body size; RoHS-compliant, lead-free, halogen-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5756M and TPA3116D2, the MP7752GF uniquely combines inductorless EMI compliance, integrated power limiting, and zero-signal auto-shutdown in a single TSSOP-28 EP package - reducing total solution size by ≥30% and eliminating four external components required by alternatives.

Availability

MP7752GF is available at Aetrix Electronics and suitable for smart TV audio subsystems, DVD/Blu-ray receivers, and active speaker designs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP7752GF 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 over two decades of expertise in DC/DC conversion, motor drivers, and audio amplifiers.

The MP7752GF belongs to MPS's Class-D Audio Amplifier product line, engineered specifically for space-constrained, energy-efficient consumer audio applications where inductorless design, thermal resilience, and system-level power management are critical.

FAQ

What is the maximum recommended supply voltage for MP7752GF, and what happens above that?

The absolute maximum supply voltage is +20V, but the recommended operating range is 5V to 18V. Exceeding 18V risks permanent damage due to overstress of internal 240mΩ MOSFETs and gate oxide layers. The under-voltage protection activates at 4.0–4.6V, but no overvoltage protection circuitry exists - external clamping or regulation is mandatory for 19–20V inputs.

How does the PLIMIT pin function, and what resistor values yield 10W output into 8Ω at 16V?

The PLIMIT pin sets a "virtual rail" where V_OUT,pp = 9 × V_PLIMIT; for 10W into 8Ω, V_OUT,pp ≈ 23.6V → V_PLIMIT = 2.62V. Using a resistor divider from AVCC (5.5V) to AGND, R_top/R_bottom ≈ 1.1 gives ~2.62V. A typical pair is 100kΩ (top) and 91kΩ (bottom), with 1µF ceramic capacitor to AGND.

Can MP7752GF drive 4Ω speakers, and what derating applies?

Yes - it supports 4Ω loads with reduced output power and increased thermal stress. At 12V, max output drops to ~7W/channel (vs. 9.5W at 8Ω) due to current limiting; efficiency falls to ~85%, and θ_JA must be improved (e.g., 2-layer PCB → 4-layer) to maintain T_J < 125°C. Derate continuous power by 30% for reliable 4Ω operation.

What is the purpose of the Cap_D pin (Pin 14), and how do I configure it for 30-second auto-shutdown delay?

Cap_D sets the hold time before InAbsence asserts low after input signal vanishes. Delay ≈ 1.6 × 10⁸ × R × C seconds, where R = 10MΩ internal pull-up. For 30s, solve C = 30 / (1.6 × 10⁸ × 10⁷) ≈ 188pF - use a 220pF NP0 capacitor from Pin 14 to AGND. Larger values increase delay; shorting to AGND disables auto-shutdown.

Does MP7752GF support single-ended input, and how is it wired?

Yes - tie IN1B and IN2B to 2.5V bias (via AVCC/2 divider or dedicated reference) and apply audio signal to IN1A/IN2A. Input impedance drops to ~16kΩ minimum, so source must drive ≤100mVrms into that load. Differential mode is preferred for noise immunity; single-ended reduces CMRR by ~30dB and increases THD by 0.1–0.2%.

How is thermal performance affected by the exposed pad (EP) connection?

The EP pad is electrically connected to PGND1/PGND2 and thermally linked to the die. Soldering it to a ≥100mm² copper pour with ≥4 thermal vias (0.3mm diameter) reduces θ_JA from 32°C/W to ≤22°C/W, enabling 15W/channel operation at TA = 70°C. Omitting EP connection raises junction temperature by ≥18°C at full load - risking thermal shutdown.

What EMI filter components are validated for CISPR22 Class B compliance?

Murata NFZ2M series magnetic beads (e.g., NFZ2M102HN1A, 1000Ω @ 100MHz) in series with each SW output and PVCC line, plus 10nF X7R capacitors from each SW to PGND, achieve Class B pass on 10-meter chamber tests. Avoid ferrite beads with saturation current <2A - they degrade EMI suppression at full power.