Monolithic Power Systems Inc. MP7752GF-P

Overview

MP7752GF-P from Monolithic Power Systems is a 18V, stereo bridge-tied-load (BTL) Class-D audio amplifier with inductorless topology, delivering 15W per channel into 8Ω at 16V supply, featuring adjustable power limiting, automatic shutdown on zero-input detection, and integrated 240mΩ MOSFETs. It targets compact, high-efficiency audio systems such as flat-panel TVs and active speakers.

For engineers reviewing the MP7752GF-P datasheet, MP7752GF-P pinout, MP7752GF-P application, or MP7752GF-P equivalent, key selection criteria include its fixed 260–360kHz switching frequency, ±5A peak output current, 90% efficiency at 12V/8Ω/10%THD, TSSOP-28 EP thermal performance (θJA = 32°C/W), and differential input architecture for EMI resilience.

Technical Context

The MP7752GF-P implements a fixed-frequency PWM modulation scheme with internal triangular waveform generation and comparator-based duty-cycle control, enabling stable EMI behavior without external inductors. Its dual-channel BTL architecture uses eight integrated N-channel MOSFETs-four per channel-with bootstrap gate drive (BST1A/BST1B/BST2A/BST2B) to sustain high-side conduction.

It integrates analog signal conditioning including programmable gain (20/26/32/36dB via GAIN0/GAIN1), input biasing at 2.5V, and real-time power limiting via PLIMIT pin (output Vpp = 9 × V_PLIMIT). Fault management includes open-drain /FAULT reporting for over-temperature (150°C trip, 130°C hysteresis) and over-current events.

Key Specifications

Pinout & Package

TSSOP-28 EP package with exposed thermal pad (EP) for enhanced heat dissipation; θJA = 32°C/W on 4-layer PCB per JESD51-7. Pin numbering follows standard TSSOP layout with pins 1–14 on top row (left to right), 15–28 on bottom row (right to left).

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 TPA3136D2, the MP7752GF-P uniquely combines inductorless operation, analog-differential input, programmable power limiting, and automatic zero-signal shutdown in a thermally optimized TSSOP-28 EP package-making it optimal for space- and power-constrained consumer audio where analog sources dominate.

Availability

MP7752GF-P is available at Aetrix Electronics and suitable for flat-panel television audio, DVD/Blu-ray receiver amplification, and smart speaker main amplifier applications requiring stable component supply, consistent thermal performance, and long-term production continuity.

Supply support for MP7752GF-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, with core expertise in DC/DC conversion, LED drivers, and Class-D audio amplifiers.

The MP7752 belongs to MPS's high-efficiency Class-D audio amplifier product line, designed specifically for compact, inductorless stereo audio systems in consumer electronics where thermal density, EMI compliance, and power efficiency are critical.

FAQ

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

The minimum input coupling capacitor depends on gain setting and lowest passband frequency. At 20dB gain (75kΩ input impedance), a 1µF capacitor yields a corner frequency of ~2.1Hz. For full 20Hz–20kHz response, ≥2.2µF is recommended with 0.1% tolerance X7R dielectric to maintain phase accuracy and avoid bass roll-off.

How does the PLIMIT pin affect maximum output power at different supply voltages?

PLIMIT sets a "virtual rail" where Vpp = 9 × V_PLIMIT. At V_PLIMIT = 1.44V, Vpp = 23.6V regardless of whether PVCC is 12V, 16V, or 18V. Output power scales as Vpp²/(8 × R_L), so 1.44V PLIMIT delivers ~10W into 8Ω at any supply ≥23.6V/9 ≈ 2.62V - enabling consistent loudness and clipping protection across variable input rails.

Can MP7752GF-P drive 4Ω loads, and what derating applies?

Yes, MP7752GF-P supports 4Ω loads but requires thermal derating. At 12V supply, max continuous power drops from 9.5W/channel (8Ω) to ~7W/channel (4Ω) due to doubled current and increased I²R losses. Junction temperature must remain ≤125°C; use θJA = 32°C/W and ensure ≥250mm² copper pour under EP pad for reliable 4Ω operation.

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

Cap_D sets the delay before auto-shutdown triggers after input signal absence. Delay time T_delay = 1.6 × 10⁸ × R × C seconds, where R = 100kΩ internal resistor and C is external capacitor to AGND. A 100nF capacitor yields ~1.6s hold time; 1µF yields ~16s. Connecting Cap_D directly to AGND disables the feature entirely.

Does MP7752GF-P require external bootstrap diodes for high-side gate drive?

No. The MP7752GF-P integrates internal bootstrap charging circuitry. External components needed are only ceramic capacitors (0.1–10µF) between each BST pin (e.g., BST1A) and its corresponding SW pin (e.g., SW1A). No external diodes or resistors are required in the bootstrap path.

How does the differential input improve EMI immunity compared to single-ended inputs?

The differential input rejects common-mode noise induced on both signal lines (e.g., from switching power supplies or RF interference), reducing measured noise floor by up to 20dB. With typical cross-talk of –110dB and A-weighted noise floor of 115µV, this architecture preserves SNR in dense PCB layouts where analog traces run near digital or power domains.

Is the TSSOP-28 EP package RoHS-compliant and lead-free?

Yes. MP7752GF-P is fully RoHS-compliant, lead-free, and halogen-free per MPS green status documentation. The exposed thermal pad (EP) is solderable and must be connected to a solid ground plane for optimal thermal performance and EMI shielding.