Monolithic Power Systems Inc. MP6908AGJ-P

Overview

MP6908AGJ-P from Monolithic Power Systems is a fast turn-off intelligent rectifier controller IC designed for synchronous rectification in flyback converters. It replaces Schottky diodes by driving an external MOSFET with programmable slew-rate detection, 40mV forward-drop regulation, and ~30ns turn-off delay. It supports high-side/low-side configurations without auxiliary winding and operates across DCM, CCM, and quasi-resonant modes up to 600kHz - used in USB PD quick chargers and ultra-low-voltage adaptors.

For engineers reviewing the MP6908AGJ-P datasheet, MP6908AGJ-P pinout, MP6908AGJ-P application, or MP6908AGJ-P equivalent, key selection criteria include its no-aux-winding supply architecture, -86mV turn-on threshold, 100µA quiescent current, TSOT23-6 thermal performance (θJA = 220°C/W), and compatibility with logic-level SR MOSFETs in energy-efficient AC/DC power supplies.

Technical Context

The MP6908AGJ-P implements adaptive gate control using VD-sensed drain-source voltage to regulate MOSFET conduction at ~40mV forward drop and trigger sub-45ns turn-off when VDS crosses -3mV. Its internal HV linear regulator accepts inputs up to +150V on HVC and generates VDD either from VD (at 5V) or HVC (at 9V), enabling self-powered operation even at 0V output or short-circuit conditions.

Ringing detection is implemented via an externally programmable SLEW pin (RSLEW = 400kΩ sets ~90ns timer), preventing false turn-on during DCM/QR demagnetization oscillations. The IC supports both high-side and low-side topologies without auxiliary windings by dynamically selecting VDD source based on HVC voltage level (e.g., 4.7–9.7V range triggers HVC-based charging at VHVC − 0.7V).

Key Specifications

Pinout & Package

MP6908AGJ-P is housed in a thermally optimized TSOT23-6 package (2.9mm × 1.6mm × 0.85mm), with exposed pad for enhanced heat dissipation and JEDEC MO-193 AB compliance. Pin 1 is bottom-left when reading top marking left-to-right (BHJ).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4306DR2G and SiHP20N60E, MP6908AGJ-P uniquely combines no-auxiliary-winding operation, programmable DCM immunity, and 0V–12V output adaptability - making it optimal for next-gen USB PD, active-clamp, and battery-charging flybacks demanding layout simplicity and wide regulation range.

Availability

MP6908AGJ-P is available at Aetrix Electronics and suitable for USB PD quick chargers, universal-input adaptors, and active-clamp flyback power supplies requiring stable component supply, RoHS-compliant packaging, and long-term industrial lifecycle support.

Supply support for MP6908AGJ-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 two decades of expertise in DC/DC converters, LED drivers, and motor drivers.

The MP6908A product line targets high-efficiency AC/DC secondary-side synchronous rectification, specifically engineered to eliminate auxiliary windings and enable ultra-compact, energy-star-compliant flyback designs across consumer and industrial power adapters.

FAQ

What is the minimum output voltage supported by MP6908AGJ-P in low-side rectification?

The MP6908AGJ-P supports true 0V output in low-side configurations because its VDD can be generated directly from VD without auxiliary winding dependency. This capability is verified in MPS application note AN-107, where the IC maintains regulation during short-circuit testing with VOUT = 0V and IOUT = 3A.

How does the SLEW pin prevent false turn-on during DCM ringing?

The SLEW pin sets a time window (e.g., 90ns with 400kΩ) during which VDS must cross the -86mV threshold to trigger turn-on. Ringing waveforms exhibit slower dV/dt than primary-switch transitions, so they fail this timing check and remain suppressed - confirmed in Figure 4 of Rev. 1.1 datasheet under "Slew Rate Detection Function."

Can MP6908AGJ-P drive a 1.8V logic-level MOSFET?

Yes - MP6908AGJ-P's VG output swings from 0.02V (low) to 4.9V (high) with 3A sink capability, fully compatible with MOSFETs having 1.8V gate threshold. Its gate drive strength ensures <30ns edges even with 2.2nF load, as measured in Electrical Characteristics Table (CLOAD = 2.2nF condition).

What is the maximum HVC voltage that can be applied continuously?

The absolute maximum HVC voltage is +150V per Absolute Maximum Ratings table. For continuous operation, MPS specifies +120V as the recommended upper limit in high-line 264VAC applications to maintain 25°C margin below TJ(MAX) = 125°C, given θJA = 220°C/W and typical power dissipation of 120mW.

Does MP6908AGJ-P require external components for VDD decoupling?

Yes - a minimum 1µF X5R ceramic capacitor must be placed between VDD and VSS, located within 2mm of the IC pins. This is mandated in PCB Layout Guidelines (Section 12) to suppress gate-drive-induced noise and ensure stable regulation during high di/dt events in QR operation.

How does MP6908AGJ-P handle short-circuit output conditions?

Under short-circuit, VD collapses near 0V, causing the IC to switch VDD sourcing from VD to HVC (if present) or enter low-power sleep mode. Its -1V minimum VD rating and 100µA quiescent current prevent latch-up, and the 40mV forward regulation remains active to block body-diode conduction - validated in Typical Application waveforms (Page 7).

Is MP6908AGJ-P pin-compatible with earlier MP6908 variants?

Yes - MP6908AGJ-P shares identical pinout, electrical characteristics, and package (TSOT23-6) with MP6908AGJ and MP6908GJ. The "-P" suffix denotes tape-and-reel packaging with enhanced moisture sensitivity level (MSL3), per MPS ordering guide revision 1.1.