Monolithic Power Systems Inc. MP7770GFR

Overview

MP7770GFR from Monolithic Power Systems is a dual-channel Class-D audio amplifier IC capable of 2 × 45W stereo single-ended output into 4Ω or 90W mono bridge-tied-load (BTL) output into 8Ω at 36V supply, featuring integrated 100mΩ MOSFETs, programmable UVP, and analog adaptive modulation for high-fidelity audio reproduction in compact home theater and high-power sound systems.

For engineers reviewing the MP7770GFR datasheet, MP7770GFR pinout, MP7770GFR application, or MP7770GFR equivalent, key selection criteria include its dual-mode output configuration (SE/BTL), ±8.5A peak current capability, THD+N = 0.03% at 1W/8Ω, 90%+ efficiency at 10% THD, and TSSOP28-EP thermal performance with exposed pad.

Technical Context

The MP7770GFR implements MPS's proprietary Analog Adaptive Modulation™ (AAM™) topology operating up to 1MHz, delivering fast transient response and excellent linearity without external compensation. Its dual-channel architecture supports independent gain control (up to 30V/V) and separate timer-based pop elimination circuits per channel via external capacitors on TIMER1/TIMER2 pins.

It integrates full protection logic including over-temperature warning (125°C trip), thermal shutdown (150°C), short-circuit detection (8.5A limit), and open-drain FAULT/OTW outputs. The internal VDD/2 reference (REF1/REF2) enables direct SE or BTL biasing, while bootstrap-driven high-side MOSFETs eliminate need for external gate drivers.

Key Specifications

Pinout & Package

TSSOP28-EP package with exposed thermal pad on bottom for enhanced heat dissipation; 28-pin layout optimized for dual-channel Class-D layout with dedicated power grounds (PGND1/PGND2), analog grounds (AGND1/AGND2), and bootstrap inputs (BST1/BST2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5756M and TPA3116D2, MP7770GFR uniquely combines high-output analog Class-D performance (90W BTL), integrated MOSFETs, programmable UVP, and dual thermal alerts - making it optimal for thermally constrained, analog-input home audio systems requiring reliability and minimal external components.

Availability

MP7770GFR is available at Aetrix Electronics and suitable for home theater receivers, DVD combo systems, high-power sound docks, and surround sound bars requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP7770GFR 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 MP7770GFR belongs to MPS's fully-integrated Class-D audio amplifier product line, designed specifically for space-constrained consumer audio equipment requiring high efficiency, low noise, and robust protection without external power devices.

FAQ

What is the recommended LC filter configuration for MP7770GFR in BTL mode?

For BTL operation, use a two-inductor/two-capacitor (LF1/LF2 + CY1/CY2) symmetric filter per channel with characteristic frequency f₀ = 1/(2π√(L_FC_F)) set between 30–50kHz. Inductors must be gapped ferrite or MPP cores rated for ≥10A saturation current; capacitors should be film-type with low ESR. Q-factor must stay between 0.7–1.0 to prevent peaking and ensure flat passband response.

How does the MP7770GFR eliminate turn-on/turn-off pop noise?

MP7770GFR integrates internal initialization current sources that gradually charge output coupling capacitors (COUT) and input coupling capacitors (CIN) during EN assertion/deassertion. The slew rate of this current is controlled by external TIMER1/TIMER2 capacitors, placing the transition outside the audio band. At shutdown, SW pins go high-impedance immediately - eliminating mechanical relay delay and associated thump.

Can MP7770GFR operate from a 12V supply in stereo SE mode?

Yes - MP7770GFR supports 9.5V–36V single-supply operation. At 12V, it delivers 2 × 12W into 4Ω at 10% THD (per datasheet Figure 6). Quiescent current remains ~29mA, and THD+N stays below 0.06% at 1W. However, maximum output power is reduced versus 24V/36V rails; thermal design must account for lower efficiency at light loads due to fixed switching losses.

What is the function of the UVP pin, and how is it configured?

The UVP pin enables programmable undervoltage protection: an external resistor divider between VDD and AGND sets the rising VDD shutdown threshold using V_SHDN ≈ 2.2V × (R_H + R_L)/R_L. For example, with R_H = 56kΩ and R_L = 5.1kΩ, shutdown occurs at ~26V on a 36V rail. This prevents pop during brown-out conditions and allows graceful power-down sequencing without external supervisors.

Is the MP7770GFR RoHS-compliant and lead-free?

Yes - MP7770GFR is fully RoHS-compliant and lead-free, meeting EU Directive 2011/65/EU. All package finishes and die attach materials are qualified for lead-free reflow soldering (JEDEC J-STD-020D). MPS confirms green status on its official Quality Assurance page, and the device carries no exemptions under current RoHS regulations.

How does thermal warning (OTW) differ from thermal shutdown (TSD)?

OTW is an early-warning signal asserted low at 125°C (with 10°C hysteresis), allowing system firmware to reduce gain or activate cooling before catastrophic failure. TSD disables all outputs at 150°C (with 20°C hysteresis) and requires die temperature to fall below 130°C before automatic restart. OTW enables proactive thermal management; TSD is a last-resort safety mechanism.