Monolithic Power Systems Inc. MP6924GS-P

Overview

MP6924GS-P from Monolithic Power Systems is a dual-channel, fast turn-off synchronous rectifier IC for LLC resonant converters, driving two N-channel MOSFETs with 35ns total turn-off delay, 45mV forward-voltage regulation (Vfwd), and light-load latching at 175µA quiescent current. It supports CCM, CrCM, and DCM operation in AC/DC adapters and PC power supplies.

For engineers reviewing the MP6924GS-P datasheet, MP6924GS-P pinout, MP6924GS-P application, or MP6924GS-P equivalent, this device is selected for high-efficiency secondary-side rectification where precise VDS sensing, sub-100ns timing control, and SOIC-8 footprint compatibility are required in isolated DC/DC topologies.

Technical Context

The MP6924GS-P implements dual independent VD-sense channels with programmable light-load entry via external resistor on LL pin, enabling latch-off when conduction period falls below 1.7–3µs. Its control logic regulates MOSFET conduction to maintain VSS–VD ≈ –45mV during forward conduction and triggers gate turn-off when VDS crosses +40mV threshold.

It features anti-bounce logic (enabled in MP6924 variant) that blanks one channel's gate driver during the other's turn-off transition, preventing cross-conduction. The SOIC-8 package integrates PGND as dedicated power ground return, separate from signal ground (VSS), supporting high-side and low-side rectifier configurations with minimal external components.

Key Specifications

Pinout & Package

MP6924GS-P is housed in a standard SOIC-8 package with exposed thermal pad (PGND-connected), optimized for PCB heat dissipation and high-voltage isolation between drain-sense and gate-drive paths.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel LLC synchronous rectifier applications.

Compared with MP6924AGS, MP6924GS-P trades 16mV higher Vfwd for superior noise immunity and cross-conduction prevention, making it more suitable for high-reliability industrial adapters. Against UCC24612-2QDRQ1, it avoids automotive qualification overhead and simplifies VDD supply design, reducing bill-of-materials cost by eliminating external LDO.

Availability

MP6924GS-P is available at Aetrix Electronics and suitable for AC/DC adapters, PC power supplies, and isolated DC/DC power converters requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP6924GS-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 analog and power ICs, with core expertise in DC/DC conversion, motor drivers, and power management solutions.

The MP6924 product line targets high-efficiency LLC resonant converter secondary-side rectification, designed specifically to replace Schottky diodes in energy-sensitive applications while maintaining robustness against voltage transients and layout parasitics.

FAQ

What is the maximum allowable VD voltage for MP6924GS-P?

The absolute maximum VD voltage is +180V relative to VSS, verified per datasheet Section "Absolute Maximum Ratings". This rating applies to both VD1 and VD2 pins and enables direct interface with 48V and 54V secondary windings without external clamping diodes.

How does the LL pin affect operational mode selection?

The LL pin sets light-load behavior: open circuit enables normal operation; 100kΩ pull-up to VDD configures ~2.3µs light-load enter timing; grounding forces shutdown with 175µA current draw. No internal pull-up exists - external resistor value directly determines T_LL per Equation (1) in the datasheet.

Can MP6924GS-P drive both high-side and low-side MOSFETs simultaneously?

Yes - its dual independent VD-sense inputs (VD1/VD2), separate gate drivers (VG1/VG2), and isolated VSS reference enable concurrent high-side and low-side synchronous rectification in center-tapped or dual-winding LLC topologies without signal coupling or timing conflict.

What is the purpose of the PGND pin, and how should it be routed?

PGND is the dedicated power ground return for MOSFET source currents and gate driver sink paths. It must be connected to a low-inductance copper pour adjacent to MOSFET sources and kept physically separate from signal ground (VSS) to prevent noise injection into Vfwd regulation loop.

Does MP6924GS-P require external components for basic operation?

Only three external components are mandatory: a ≥1µF VDD decoupling capacitor, an LL timing resistor (if light-load mode is used), and 1kΩ series resistors between VD1/VD2 and MOSFET drains for ESD protection - no bootstrap capacitors, level shifters, or auxiliary bias supplies are needed.

How does the anti-bounce logic improve system reliability?

Anti-bounce logic blanks one channel's gate driver output during the other channel's turn-off transition, eliminating risk of shoot-through in dual-MOSFET configurations. This feature is active in MP6924GS-P (but disabled in MP6924AGS), making it preferred for high-power density layouts where layout-induced coupling is unavoidable.

What thermal derating applies above 25°C ambient?

SOIC-8 θ_JA is 90°C/W. At 70°C ambient, maximum continuous power dissipation drops to (150°C − 70°C)/90°C/W = 0.89W. Derating must follow PD(MAX) = (T_J(MAX) − T_A)/θ_JA; thermal shutdown activates at 150°C junction temperature with 10°C hysteresis.