Monolithic Power Systems Inc. MP9989AGV-P

Overview

MP9989AGV-P from Monolithic Power Systems is a CCM/DCM flyback ideal diode IC integrating a 100V/10mΩ MOSFET, designed for high-side or low-side synchronous rectification in AC-DC adapters. It regulates forward voltage drop to 40mV, achieves 25ns turn-off delay, eliminates auxiliary winding need, and supports USB PD/QC chargers with 0V–20V output range.

For engineers reviewing the MP9989AGV-P datasheet, MP9989AGV-P pinout, MP9989AGV-P application, or MP9989AGV-P equivalent, this device delivers fast turn-off timing, ringing immunity in quasi-resonant operation, and self-powered VDD generation - critical for compact, high-efficiency flyback designs targeting laptop adapters and universal USB-C power supplies.

Technical Context

The MP9989AGV-P implements adaptive gate control using slew-rate detection and dual blanking timers (1.2µs turn-on, variable turn-off) to prevent false triggering during DCM ringing. Its internal linear regulator generates 6.7V VDD from SENSE without auxiliary winding, enabling high-side rectification at low output voltages.

It operates across CCM, DCM, and quasi-resonant flyback topologies with −80mV turn-on threshold and −3mV turn-off threshold, maintaining VFWD regulation at 40mV while dynamically adjusting gate drive to minimize conduction loss across load current.

Key Specifications

Pinout & Package

MP9989AGV-P is packaged in a thermally enhanced QFN4x5-8 (exposed thermal pad) with wettable flanks, optimized for high-power density flyback secondary-side layouts. The package supports reflow soldering per JEDEC MO-220 and provides 9°C/W junction-to-case thermal resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar flyback synchronous rectifier applications.

Compared with NCP4306DR2G and SiHP065N10AD, MP9989AGV-P uniquely integrates control, power switch, and self-powered operation - reducing component count by 3–5 parts, enabling smaller form factors, and delivering superior light-load efficiency without sacrificing robustness in CCM/DCM/QR modes.

Availability

MP9989AGV-P is available at Aetrix Electronics and suitable for laptop adapters, USB PD fast chargers, and industrial flyback SMPS requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP9989AGV-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 power management ICs, with over 20 years of expertise in DC-DC conversion, motor drivers, and intelligent power solutions.

The MP9989 belongs to MPS's Intelligent Rectifier product line, engineered specifically to replace Schottky diodes in flyback converters - prioritizing zero-auxiliary-winding operation, ultra-fast turn-off, and seamless CCM/DCM/QR mode interoperability.

FAQ

What is the maximum continuous output current supported by MP9989AGV-P in a 4-layer PCB design?

At 100°C case temperature on a standard 4-layer PCB with 2oz copper and thermal vias, MP9989AGV-P supports 17.8A continuous drain current. For typical 48W flyback adapters, this translates to ≥4A output at 12V with <15°C junction rise, verified in MPS Application Note AN-108.

Does MP9989AGV-P require an external gate resistor for the integrated MOSFET?

No - the gate driver is fully integrated and internally optimized for the 10mΩ MOSFET. External gate resistors are unnecessary and discouraged, as they degrade turn-off speed and compromise the 25ns t_D-OFF specification critical for CCM operation.

How does the SENSE pin handle negative voltage transients during DCM ringing?

The SENSE pin tolerates −1V absolute minimum, and MPS recommends adding a 100Ω–300Ω series resistor between SENSE and drain to limit peak negative excursion during body-diode conduction while preserving slew-rate detection integrity per AN-108 Section 4.2.

Can MP9989AGV-P be used in high-side rectification with 5V output?

Yes - its auxiliary-winding-free VDD generation and 0V–20V output capability make it ideal for high-side 5V USB PD applications. The SENSE-to-drain RC network and PCB layout guidelines in Figure 5 ensure reliable startup and transient immunity at low V_OUT.

What thermal pad soldering requirements apply to the QFN4x5-8 package?

The exposed thermal pad must be soldered to a solid copper pour with ≥6 thermal vias (0.3mm diameter, filled) connecting to inner ground planes. Reflow profile must follow JEDEC J-STD-020, with peak temperature ≤260°C and time above 217°C limited to 60–90 seconds.

Is MP9989AGV-P compatible with quasi-resonant flyback controllers like MP6908?

Yes - MP9989AGV-P is explicitly validated with QR controllers including MP6908 and third-party ICs. Its slew-rate detection and 2V turn-off blanking threshold prevent false triggering from resonant valley switching waveforms, as confirmed in MPS Evaluation Report EV9989-QR-01.

What is the recommended decoupling capacitance on the VDD pin?

A 1µF X5R ceramic capacitor placed within 2mm of VDD and VS pins is mandatory. This value is specified in the Absolute Maximum Ratings table and validated in all MPS reference designs (e.g., EV9989-GV-01) to maintain stable 6.7V regulation under 63mA peak charging current.