The MP9989GS-Z from Monolithic Power Systems is a fast-turn-off intelligent synchronous rectifier designed for flyback converters. It integrates a 100V power MOSFET and can replace a conventional secondary-side rectifier diode to reduce conduction loss, improve conversion efficiency, and increase power density.
The integrated MOSFET has a typical on-resistance of 10mΩ and a specified maximum of 12.5mΩ at a 2A drain current and 25°C junction temperature. The control circuit regulates the internal switch’s forward voltage drop to 40mV typical and turns the MOSFET off before the drain-to-source voltage reverses.
The MP9989 generates its own supply through the SENSE pin and an internal linear regulator, eliminating the need for an auxiliary transformer winding. It supports both high-side and low-side synchronous rectification and can operate in applications with output voltages extending down to 0V.
The controller supports continuous-conduction mode, discontinuous-conduction mode, and quasi-resonant flyback operation. Internal slew-rate and ringing-detection circuitry helps prevent false MOSFET turn-on caused by demagnetization ringing during DCM and quasi-resonant operation.
Typical quiescent current is 110μA, with a specified maximum of 135μA. At a 100kHz switching frequency, operating current is 4mA typical and 6mA maximum. The typical turn-on threshold is −80mV, with approximately 20ns turn-on delay and 25ns turn-off delay.
The MP9989GS-Z is supplied in an SOIC-8 surface-mount package. The internal MOSFET has an absolute-maximum continuous drain-current rating of 14.9A at a 25°C case temperature; this is not the same as the converter’s continuous output-current rating. For a typical universal-input adapter, MPS generally recommends an output-current rating of approximately 4A, subject to thermal and power-loss analysis.
The recommended operating junction-temperature range is −40°C to +125°C, with a maximum junction temperature of 150°C. The “-Z” ordering suffix specifies tape-and-reel packaging, with 2,500 units per reel. The component is MSL 2 rated, lead-free, halogen-free, and RoHS compliant.
Key Specifications
- Manufacturer: Monolithic Power Systems
- Manufacturer Part Number: MP9989GS-Z
- Device Type: Flyback Intelligent Synchronous Rectifier
- Supported Modes: CCM, DCM and Quasi-Resonant
- Integrated Power Device: N-Channel MOSFET
- Drain-to-Source Breakdown Voltage: 100V
- Typical On-Resistance: 10mΩ
- Maximum On-Resistance: 12.5mΩ
- Typical Forward Regulation Voltage: 40mV
- Forward Regulation Range: 25mV to 55mV
- Typical Turn-On Threshold: −80mV
- Typical Turn-Off Threshold: 3mV
- Typical Turn-On Delay: 20ns
- Typical Turn-Off Delay: 25ns
- Typical Turn-On Blanking Time: 1.2μs
- Typical Quiescent Current: 110μA
- Maximum Quiescent Current: 135μA
- Typical Operating Current: 4mA at 100kHz
- Maximum Operating Current: 6mA at 100kHz
- Recommended VDD Range: 4.5V to 13V
- Typical VDD UVLO Rising Threshold: 4.2V
- Single-Pulse Avalanche Energy: 20mJ
- SOIC-8 Continuous Drain Current: 14.9A at TC=25°C
- SOIC-8 Continuous Drain Current: 9.42A at TC=100°C
- SOIC-8 Pulsed Drain Current: 50A
- SOIC-8 Maximum Power Dissipation: 1.7W at TA=25°C
- Junction-to-Ambient Thermal Resistance: 70°C/W
- Junction-to-Case Thermal Resistance: 32°C/W
- Recommended Junction Temperature: −40°C to +125°C
- Maximum Junction Temperature: 150°C
- Package: SOIC-8
- Mounting Type: Surface Mount
- Moisture Sensitivity Level: MSL 2
- Packaging: Tape and Reel
- Standard Reel Quantity: 2,500 Units
- Compliance: Lead-Free, Halogen-Free and RoHS
- Product Status: Active
Typical Applications
Suitable for laptop adapters, QC fast chargers, USB Power Delivery chargers, and high-efficiency flyback converters. Transformer secondary-voltage spikes, MOSFET voltage margin, synchronous-rectification current, SENSE routing, snubber design, and PCB thermal performance should be verified in the final design.
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