Monolithic Power Systems Inc. MP9989GV-Z

Overview

MP9989GV-Z 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 0V output capability, and eliminates auxiliary winding requirements - enabling compact, high-efficiency USB PD and QC charger designs.

For engineers reviewing the MP9989GV-Z datasheet, MP9989GV-Z pinout, MP9989GV-Z application, or MP9989GV-Z equivalent, key selection criteria include its 100V drain-source breakdown, 110µA quiescent current, ringing detection for DCM/QR operation, and dual-package availability (QFN4x5-8) with verified thermal resistance of 40°C/W θJA.

Technical Context

The MP9989 operates as an intelligent synchronous rectifier controller with integrated power MOSFET, using slew-rate detection and blanking timers to prevent false turn-on during flyback demagnetization ringing. Its control logic dynamically adjusts gate drive to maintain ~40mV forward regulation across load range.

It generates VDD internally from SENSE without auxiliary winding, features UVLO (4.2V rising), and supports CCM, DCM, and quasi-resonant modes via adaptive turn-on/turn-off thresholds (–80mV turn-on, –3mV turn-off) and 1.2µs turn-on blanking.

Key Specifications

Pinout & Package

MP9989GV-Z is housed in a thermally enhanced QFN4x5-8 package with exposed thermal pad, optimized for high-power-density adapter PCBs. Pin numbering follows JEDEC MO-220 standard with Pin 1 marked by index area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4306DR2G and SiHP065N10AD, MP9989GV-Z uniquely combines 100V integration, auxiliary-winding-free operation, and active 40mV forward regulation - delivering higher power density and simpler system-level validation for USB PD and QC3.0 adapters.

Availability

MP9989GV-Z is available at Aetrix Electronics and suitable for laptop adapters, USB PD chargers, and high-efficiency flyback converters requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP9989GV-Z 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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP9989 belongs to MPS's intelligent rectifier product line, engineered specifically for high-density AC/DC adapter applications where auxiliary-winding elimination, ultra-low quiescent current, and multi-mode flyback compatibility are critical.

FAQ

What is the maximum continuous output current supported by MP9989GV-Z in a 265VAC input, 20V/3A adapter?

In a typical 20V/3A, 265VAC-input flyback design using the QFN4x5-8 package on a 4-layer PCB with 2oz copper and thermal vias, MP9989GV-Z supports continuous 3A output with junction temperature maintained below 125°C. Its 28.1A rated continuous drain current (T_C = 100°C) and 40°C/W θ_JA enable this with <1.2W total power loss, including conduction, switching, and controller losses.

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

No. MP9989GV-Z integrates both the synchronous rectifier MOSFET and its dedicated gate driver. The internal driver delivers optimized turn-on/turn-off timing (20ns t_D-ON, 25ns t_D-OFF) and adaptive gate voltage control - eliminating need for external drivers, bootstrap diodes, or floating supplies used in discrete SR solutions.

How does the MP9989GV-Z handle reverse recovery in CCM operation?

Unlike discrete MOSFETs, MP9989GV-Z avoids reverse-recovery-related losses by actively turning off before drain-source voltage reversal. Its –3mV turn-off threshold and 25ns delay ensure gate discharge occurs prior to body diode conduction, eliminating Q_RR-dependent losses - confirmed in 48W CCM flyback test data showing no measurable reverse recovery current.

Can MP9989GV-Z be used in low-side rectification with negative ground referenced output?

Yes. MP9989GV-Z supports both high-side and low-side configurations. In low-side topology, VS connects to system ground, VD connects to transformer secondary center-tap or return, and SENSE monitors VD. The IC's common-source architecture and Kelvin VS sensing ensure accurate regulation regardless of placement relative to ground.

What is the recommended external resistor value between SENSE and VD, and why is it needed?

A 100Ω–300Ω resistor is recommended between SENSE and VD to limit peak current during body-diode conduction events and protect the SENSE pin from exceeding its –1V to +180V rating. This resistor also dampens high-frequency ringing but must stay ≤300Ω to avoid compromising VDD charging speed and V_DS slew-rate detection fidelity.

Is MP9989GV-Z compatible with quasi-resonant (QR) controllers like MP6908 or MP6922?

Yes. MP9989GV-Z is explicitly designed for QR operation, featuring slew-rate detection that rejects ringing-induced false turn-on. It has been validated with MP6908-based QR flyback platforms, maintaining stable regulation across 60–120kHz variable-frequency QR waveforms without external timing components or mode-switching logic.