Monolithic Power Systems Inc. MP6922N-HGS

Overview

MP6922N-HGS from Monolithic Power Systems is a dual-channel fast turn-off intelligent synchronous rectification controller for LLC resonant converters, regulating MOSFET V_DS to 70mV with 20ns total turn-off delay, supporting CCM/CrCM/DCM operation up to 300kHz, and featuring reverse current protection and light-load latching for <600µA quiescent current in AC-DC adapters and LCD TV power supplies.

For engineers reviewing the MP6922N-HGS datasheet, MP6922N-HGS pinout, MP6922N-HGS application, or MP6922N-HGS equivalent, key selection criteria include its 70mV V_DS regulation accuracy, 20ns turn-off propagation delay, SOIC8E package with exposed thermal pad, RCP-enabled safe CCM operation, and dual-channel independent sensing for center-tapped or full-wave LLC topologies.

Technical Context

The MP6922N-HGS implements adaptive gate drive control per channel using drain-source voltage (V_DS) sensing to regulate conduction loss at ~70mV while preventing reverse current via RCP-triggered 100µs latch-off. Its blanking logic enforces 1µs minimum on-time and 1.6µs off-time to suppress noise-induced false triggering during high-dv/dt transitions.

It operates across three LLC modes-CCM, CrCM, and DCM-with separate EN and UVLO thresholds (1.5V enable, 6.0V VDD UVLO), integrated thermal shutdown at 150°C, and programmable light-load entry via external resistor on LL pin (SOIC14 variant), though MP6922N-HGS uses fixed internal timing.

Key Specifications

Pinout & Package

MP6922N-HGS is supplied in SOIC8E package with exposed thermal pad (pin 2), optimized for thermal performance in high-power density LLC SR applications. Pin numbering follows standard SOIC8E top-view convention with pin 1 marked by notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4306DR2G, MP6922N-HGS delivers true dual-channel integration, 15ns faster turn-off, and built-in RCP-reducing BOM count and improving CCM reliability. Versus discrete MOSFET + controller approaches, it simplifies layout and eliminates gate drive matching issues but requires careful V_DS sense routing.

Availability

MP6922N-HGS is available at Aetrix Electronics and suitable for AC-DC adapters, LCD TV power supplies, and telecom SMPS requiring stable component supply, high-frequency synchronous rectification, and certified RoHS-compliant packaging.

Supply support for MP6922N-HGS 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 over 20 years of expertise in DC-DC conversion, motor drivers, and power management.

The MP6922 product line targets high-efficiency LLC resonant converter applications, designed specifically to replace Schottky diodes with intelligent dual-channel synchronous rectification while meeting global energy standards.

FAQ

What is the function of the exposed pad (Pin 2) on MP6922N-HGS?

The exposed pad is PGND and serves as the primary thermal and electrical return path for power switching currents. It must be soldered to a minimum 100mm² copper area with ≥4 thermal vias to an inner ground plane to achieve rated 2.5W power dissipation and maintain junction temperature below 150°C at +25°C ambient.

Does MP6922N-HGS support both CCM and DCM LLC operation without configuration changes?

Yes - MP6922N-HGS automatically adapts to CCM, CrCM, and DCM modes using its V_DS-based control loop. In CCM, RCP protection activates; in DCM/CrCM, the controller relies on V_DS polarity reversal to trigger turn-off, eliminating need for external mode-select pins or programming.

How does the light-load latching function reduce standby power?

When MOSFET conduction time drops below 2.2µs per cycle, MP6922N-HGS disables gate drive after a 120µs delay and enters a state drawing only 600µA from VDD. This eliminates gate charge/discharge losses while retaining fast wake-up capability when load increases.

What is the maximum allowable V_D–V_S voltage on VD1/VD2 pins?

The absolute maximum rating is –0.7V to +180V. During normal operation, V_DS remains negative (forward conduction); the +180V rating accommodates transient spikes from transformer leakage inductance or layout parasitics, requiring a 10–100Ω series resistor between VD pin and MOSFET drain.

Can MP6922N-HGS drive logic-level and standard-threshold MOSFETs interchangeably?

Yes - its gate driver delivers 14V high-level output (VDD >16V) and 0.1V low-level, compatible with both logic-level (V_GS(th) ≤ 2.5V) and standard (V_GS(th) ≈ 4V) N-CH MOSFETs. No external level-shifting components are required.

Is there a recommended minimum PCB trace width for VS1/VS2 connections?

VS1 and VS2 require Kelvin connections directly to MOSFET sources with ≤5mΩ total loop resistance. Use ≥0.5mm wide traces, avoid sharing with PGND return paths, and place sense traces inside the MOSFET source pad outline to minimize inductive coupling and ensure accurate 70mV V_DS regulation.

What happens during thermal shutdown and how does recovery work?

At 150°C junction temperature, MP6922N-HGS pulls both VG1 and VG2 low and halts switching. Recovery occurs automatically when junction temperature falls to 120°C (30°C hysteresis), restoring gate drive without requiring EN pin reset or power cycle.