Monolithic Power Systems Inc. MP7752GF-Z

Overview

MP7752GF-Z from Monolithic Power Systems is a 18V, stereo BTL, inductorless Class-D audio amplifier IC delivering 15W per channel into 8Ω at 16V supply, featuring fixed 260–360kHz switching frequency, integrated 240mΩ MOSFETs, and automatic shutdown on zero-input detection. It targets compact audio systems requiring high efficiency (90% at 12V/8Ω), low-EMI operation without external inductors, and pop-free startup/shutdown.

For engineers reviewing the MP7752GF-Z datasheet, MP7752GF-Z pinout, MP7752GF-Z application, or MP7752GF-Z equivalent, key selection criteria include its adjustable power limiter (PLIMIT pin), differential analog input architecture, TSSOP-28 EP thermal performance (θJA = 32°C/W), and fault reporting via open-drain /FAULT output.

Technical Context

The MP7752GF-Z implements a fully integrated stereo BTL Class-D topology with two independent half-bridge channels, each using internal N-channel MOSFETs with 240mΩ R_DS(ON). Its fixed-frequency PWM modulator operates between 260kHz and 360kHz, enabling predictable EMI filtering and inductorless operation validated to CISPR22 Class B.

It integrates analog input biasing (2.5V common-mode), dual gain control (GAIN0/GAIN1 pins for 20–36dB settings), and system-level protection including over-current (±5A peak), thermal shutdown (150°C trip, 20°C hysteresis), and under-voltage lockout (4.0–5.0V threshold).

Key Specifications

Pinout & Package

TSSOP-28 EP package with exposed thermal pad (pin 28 connected to PGND); 0.65mm pitch, 9.7mm × 4.4mm footprint; θ_JA = 32°C/W on 4-layer PCB.

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 MAX9744, MP7752GF-Z uniquely combines analog input simplicity, inductorless EMI compliance, and system-level power management (PLIMIT + InAbsence) in a compact TSSOP-28 EP package-making it optimal for space- and efficiency-constrained consumer audio.

Availability

MP7752GF-Z is available at Aetrix Electronics and suitable for smart TV audio subsystems, DVD receiver output stages, and USB-powered active speakers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP7752GF-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 mixed-signal ICs for power management and audio applications, headquartered in Kirkland, WA.

The MP7752 belongs to MPS's Class-D audio amplifier product line, designed specifically for compact, high-efficiency stereo audio systems in consumer electronics where thermal, EMI, and board-area constraints dominate.

FAQ

What is the minimum recommended input coupling capacitor value for MP7752GF-Z?

The minimum input coupling capacitor is determined by the lowest target frequency and input impedance. At 20dB gain (75kΩ min input impedance), a 1µF capacitor yields a corner frequency of ~2.1Hz - well below 20Hz audio band. For robust DC blocking across all gain settings, 2.2µF X7R ceramic is recommended and validated in the EVB design.

Can MP7752GF-Z operate from a 5V supply while delivering meaningful output power?

Yes - at 5V supply, MP7752GF-Z delivers 1.2W per channel into 8Ω at 10% THD (per operating specs). This is sufficient for headphone amplification or low-power portable speakers. Efficiency drops to ~75%, and thermal headroom remains adequate due to low dissipation (P_D ≈ 0.3W per channel).

How does the PLIMIT function interact with gain setting and speaker impedance?

PLIMIT sets a maximum peak-to-peak output voltage (V_OUT(pp) = 9 × V_PLIMIT), independent of gain or load. For example, at V_PLIMIT = 1.44V, V_OUT(pp) ≤ 12.96V → P_MAX = (12.96V)²/(8Ω × 8) ≈ 10W into 8Ω. Lower impedance loads (e.g., 4Ω) increase current demand but do not raise voltage beyond the PLIMIT cap.

Is the InAbsence function compatible with AC-coupled audio inputs?

Yes - the internal zero-signal detector monitors differential input amplitude regardless of DC bias. With AC-coupled inputs, the 2.5V internal bias maintains proper common-mode level at IN1A/IN1B and IN2A/IN2B, allowing reliable absence detection down to <2mV RMS input (per spec).

What thermal derating applies above 25°C ambient temperature?

Using θ_JA = 32°C/W, maximum continuous power must be reduced by 31.25mW/°C above 25°C. At 70°C ambient, max safe dissipation drops to (150°C − 70°C)/32°C/W = 2.5W total (1.25W per channel), corresponding to ~7.5W output per channel into 8Ω at 12V.

Does MP7752GF-Z require external bootstrap diodes on BSTx pins?

No - the MP7752GF-Z integrates internal bootstrap charging circuitry. External components required per BST pin are only a 0.1µF–10µF ceramic capacitor from BSTx to SWx; no diode or resistor network is needed, simplifying layout and reducing BOM count.

How is EMI performance verified, and what test standard was met?

The MP7752 evaluation board passed CISPR22 Class B radiated emissions testing in a 10-meter chamber with 1.2m twisted-pair speaker cables and full stereo 9.5W × 2 output at 1kHz. This validates inductorless operation for commercial CE/FCC compliance without additional shielding or ferrites.