Monolithic Power Systems Inc. MP7720DP-LF

Overview

MP7720DP-LF from Monolithic Power Systems is a mono 20W Class D audio amplifier in PDIP-8 package, integrating 180mΩ N-channel MOSFETs, analog adaptive modulation, and pop-elimination circuitry. It delivers 20W into 4Ω at 24V with 0.04% THD+N (1W/8Ω), 93% efficiency, and operates from 9.5V–24V single supply - used in flat-panel TVs and multimedia computers for compact, high-efficiency audio output stages.

For engineers reviewing the MP7720DP-LF datasheet, MP7720DP-LF pinout, MP7720DP-LF application, or MP7720DP-LF equivalent, key selection criteria include its single-ended Class D topology, integrated bootstrap driver (BS pin), thermal shutdown at 150°C, mute/standby control via EN, and compatibility with LC filter-based speaker interfaces requiring <190µV noise floor and >60dB PSRR.

Technical Context

The MP7720DP-LF implements Monolithic Power Systems' proprietary Analog Adaptive Modulation™ topology, enabling variable-frequency switching up to 1MHz with fast transient response and high PSRR (60dB at 1kHz). Its differential input stage (PIN/NIN) sets common-mode bias at VDD/2 via external resistive divider, while internal gate drivers support bootstrap operation (BS–SW capacitor) for full enhancement of the high-side MOSFET.

It integrates short-circuit protection (5A current limit per switch), thermal shutdown with 30°C hysteresis, and active pop elimination during startup/shutdown by controlling charge/discharge transients across the output coupling capacitor. The device operates exclusively in single-ended mode with no bridge-tied load (BTL) capability.

Key Specifications

Pinout & Package

MP7720DP-LF uses an 8-pin PDIP package (JEDEC MS-001 BA) with 0.300" width, rated for –40°C to +85°C ambient operation and θ_JA = 95°C/W. Pin 1 (PIN) is top-left corner with notch marking orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5102DAP and TPA3110D2PWPR, MP7720DP-LF offers the only fully integrated mono single-ended solution with on-chip MOSFETs, pop elimination, and PDIP-8 packaging - making it optimal for cost-sensitive, space-constrained mono audio systems where simplicity and reliability outweigh raw power scaling.

Availability

MP7720DP-LF is available at Aetrix Electronics and suitable for flat panel televisions, multimedia computers, and home stereo systems requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MP7720DP-LF 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, headquartered in Kirkland, WA, with global design and support operations.

The MP7720 belongs to MPS' Class D Audio Amplifier product line, engineered specifically for compact, high-efficiency mono audio output stages in consumer electronics - emphasizing integration, thermal robustness, and EMI-conscious design.

FAQ

What is the maximum continuous output power of MP7720DP-LF into 4Ω?

The MP7720DP-LF delivers 20W continuous output into a 4Ω load at 24V supply with THD+N ≤10%. This is verified under recommended operating conditions (TA = +25°C, 1kHz sine wave) and assumes proper thermal management using the specified PDIP-8 θJA of 95°C/W.

Does MP7720DP-LF support bridge-tied load (BTL) configuration?

No. MP7720DP-LF is strictly a single-ended Class D amplifier with one switched output (SW pin) and internal ground-referenced architecture. It does not support BTL operation - attempting to configure it as such will result in improper biasing and potential damage.

How is the gain set on MP7720DP-LF?

Gain is set externally using resistors R1 and R4 in the feedback network at NIN. The voltage gain equation is AV = 1 + (R4/R1). Typical values from the datasheet include R4 = 82kΩ and R1 = 10kΩ for AV = 9.2 (19.3dB), optimized for 24V supply and 1.5V RMS input.

What LC filter values are recommended for MP7720DP-LF?

The typical LC filter uses a 10µH shielded toroidal inductor and 0.47µF film capacitor, yielding a characteristic frequency (~23kHz) that passes full audio bandwidth while attenuating 600–700kHz switching noise. Q must be maintained between 0.7–1.0 using speaker impedance (4Ω or 8Ω) as the damping resistor.

Can MP7720DP-LF operate from a 12V supply?

Yes. MP7720DP-LF operates from 9.5V to 24V. At 12V, it delivers ~5W into 4Ω (per datasheet POUT vs. VDD curve), maintaining 90% efficiency and 0.08% THD+N at 1W - suitable for low-power monitors or portable audio docks.

Is there a thermal pad or exposed die attach on the PDIP-8 package?

No. The MP7720DP-LF in PDIP-8 has no thermal pad or exposed metal slug. Heat dissipation relies solely on leads and PCB copper; for >10W continuous output, use ≥2 sq-in of 2oz copper connected to PGND/VDD pins with multiple vias.

What is the purpose of the BS pin and required external components?

The BS (bootstrap) pin supplies gate drive voltage above VDD for the internal high-side MOSFET. It requires a 0.1µF ceramic capacitor between BS and SW, plus a 6.2V zener diode from BS to SW to clamp overvoltage during switching transitions and protect the gate oxide.