Monolithic Power Systems Inc. MP9989GV-P

Overview

MP9989GV-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, supports quasi-resonant operation, and eliminates auxiliary winding requirements - enabling compact 48W USB PD charger designs with >94% efficiency at 265VAC input.

For engineers reviewing the MP9989GV-P datasheet, MP9989GV-P pinout, MP9989GV-P application, or MP9989GV-P equivalent, this device delivers fast turn-off timing control, ringing-immune DCM detection, and self-powered operation critical for energy-efficient flyback converters targeting laptop adapters and universal USB-C power supplies.

Technical Context

The MP9989GV-P implements intelligent 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, supporting output voltages down to 0V.

It operates across CCM, DCM, and quasi-resonant modes with −80mV turn-on threshold and −3mV turn-off threshold, while maintaining regulated 40mV forward voltage via dynamic gate drive adjustment - reducing conduction loss versus diode rectifiers by up to 65% at 4A load.

Key Specifications

Pinout & Package

MP9989GV-P is housed in a thermally enhanced QFN4x5-8 package with exposed thermal pad. Pin functions are identical to SOIC-8 variant but optimized for PCB heat spreading via bottom-side copper connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4306DR2G and SiHP22N60E+MP6908, MP9989GV-P delivers superior integration (no auxiliary winding, self-powered), tighter forward-drop regulation (40mV vs 60mV), and faster turn-off (25ns vs 45ns), making it optimal for space- and efficiency-critical USB PD and laptop adapter designs.

Availability

MP9989GV-P is available at Aetrix Electronics and suitable for laptop adapters, USB PD chargers, and industrial flyback power supplies requiring stable component supply, RoHS-compliant sourcing, and long-term lifecycle support.

Supply support for MP9989GV-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 AC-DC controllers.

The MP9989 product line targets high-efficiency flyback synchronous rectification, specifically engineered to replace Schottky diodes in compact, high-density AC-DC adapters while meeting global energy standards like Energy Star and DOE VI.

FAQ

What is the maximum continuous output current supported by MP9989GV-P in a 48W flyback design?

MP9989GV-P supports up to 4A continuous output current in universal-input 48W flyback adapters, validated at both 90VAC and 265VAC inputs. This rating assumes QFN4x5-8 package mounted on 2oz copper with ≥4 thermal vias to inner ground plane, achieving ≤125°C junction temperature at full load.

Does MP9989GV-P require an external gate driver or bootstrap circuit?

No. MP9989GV-P integrates a fully autonomous gate driver with dynamic voltage regulation, eliminating need for external drivers or bootstrap components. The internal circuitry directly controls the 100V MOSFET gate using VDD as reference, with slew-rate-limited turn-on to prevent EMI.

How does the SENSE pin function during high-side rectification?

In high-side configuration, SENSE connects to the drain of the internal MOSFET and serves dual roles: it feeds the linear regulator input to generate VDD, and provides real-time V_DS sensing for timing control. An external 100–300Ω resistor between SENSE and drain is recommended to limit negative transients during body-diode conduction.

Can MP9989GV-P operate in quasi-resonant (QR) flyback mode?

Yes. MP9989GV-P includes dedicated ringing detection circuitry that discriminates between primary-side switching transitions and DCM/QR ringing using 30ns slew-rate detection. This allows reliable operation in QR mode without false turn-on, confirmed in typical application circuits at 65–130kHz switching frequencies.

What thermal derating applies when using MP9989GV-P in SOIC-8 versus QFN4x5-8 packages?

SOIC-8 version has θ_JA = 70°C/W and 9.42A max continuous current at 100°C case temperature, while QFN4x5-8 offers θ_JA = 40°C/W and 17.8A rating. For same PCB layout, QFN reduces junction temperature rise by ~43%, enabling 2× higher current handling or 30°C lower thermal margin at 4A.

Is MP9989GV-P compatible with transformers lacking auxiliary windings?

Yes - this is a core design feature. MP9989GV-P generates its own 6.7V VDD supply from the SENSE pin using an internal linear regulator, removing dependency on auxiliary windings. This enables high-side rectification in compact, low-cost transformers used in USB PD and QC adapters.

What protection features are built into MP9989GV-P?

MP9989GV-P includes under-voltage lockout (4.0–4.4V hysteresis), thermal shutdown at 150°C, ±1200V HBM ESD protection, and turn-off blanking to prevent false re-triggering. It also features single-pulse avalanche energy rating of 20mJ, safeguarding against inductive switching transients in flyback topologies.