Monolithic Power Systems Inc. MP6922AGN-Z

Overview

MP6922AGN-Z from Monolithic Power Systems is a dual-channel, fast-turn-off intelligent rectifier IC designed for synchronous rectification in LLC resonant converters. It drives two N-channel MOSFETs, regulates forward voltage drop to 30mV, achieves 20ns total turn-off delay, supports up to 300kHz switching, and includes reverse-current protection and light-load latching. It operates across 8V–24V VDD and targets high-efficiency AC-DC adapters.

For engineers reviewing the MP6922AGN-Z datasheet, MP6922AGN-Z pinout, MP6922AGN-Z application, or MP6922AGN-Z equivalent, this device is selected for precise V_DS-based MOSFET control, ultra-low quiescent current (<600μA) in light-load mode, and robust operation in CCM/CrCM/DCM topologies with integrated thermal shutdown and UVLO.

Technical Context

The MP6922AGN-Z implements dual independent channel control using drain-source voltage sensing (VD1/VD2 vs. VS1/VS2) to trigger MOSFET gate drive with programmable blanking and adaptive regulation. Each channel features a 30mV turn-on threshold and +30mV turn-off threshold, with 1μs minimum on-time enforced by internal blanking logic.

Its reverse-current protection uses an external RCP pin with 3V threshold and 150μs latch duration, while light-load mode is activated via LL pin resistor timing (2.2μs pulse width, 160μs enter delay) to reduce driver losses below 600μA. The IC integrates thermal shutdown (150°C trip, 30°C hysteresis) and EN-controlled enable/disable sequencing.

Key Specifications

Pinout & Package

MP6922AGN-Z is supplied in SOIC8E package with exposed thermal pad (PGND), offering 2.5W continuous power dissipation at +25°C ambient and 50°C/W θ_JA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6922AGS-Z, the MP6922AGN-Z offers superior thermal performance (50°C/W vs. 86°C/W) and smaller PCB area, while SRK2001A lacks integrated light-load management and reverse-current protection-requiring three additional components per channel to achieve parity.

Availability

MP6922AGN-Z is available at Aetrix Electronics and suitable for AC-DC adapters, LCD/PDP TV power supplies, and telecom SMPS requiring stable component supply, RoHS-compliant packaging, and long-lifecycle support.

Supply support for MP6922AGN-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 analog and power ICs, with design centers in the US, China, and Taiwan.

The MP6922A product line delivers intelligent synchronous rectification solutions optimized for high-frequency LLC resonant converters in energy-efficient consumer and telecom power supplies.

FAQ

What is the purpose of the LL pin on MP6922AGN-Z?

The LL pin sets light-load timing parameters via an external resistor. It determines the 2.2μs pulse width (τ_LL) and 160μs entry delay (τ_LL-Delay) that trigger gate driver latching under low-current conditions. This reduces quiescent current to <600μA and improves no-load efficiency without auxiliary winding dependency.

How does the RCP pin provide reverse-current protection?

The RCP pin accepts a voltage divider signal from the MOSFET drain path. When the divided voltage exceeds 3V, the IC latches both gate drivers off for 150μs to prevent shoot-through during reverse current flow in high-frequency CCM operation. This hardware-based response avoids software delays and external comparator circuits.

Can MP6922AGN-Z operate in continuous-conduction mode (CCM)?

Yes, MP6922AGN-Z supports CCM, CrCM, and DCM operation. Its 20ns turn-off propagation delay and blanking logic ensure safe switching even during fast transients. The 30mV turn-off threshold and adaptive gate drive maintain precise V_DS control without oscillation or false triggering in CCM.

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

The absolute maximum rating for VD1 and VD2 is +180V relative to VS1/VS2. This allows direct connection to high-voltage secondary windings in 100–240VAC input systems. A small series resistor between VD pin and MOSFET drain is recommended to limit current if VG drops below –0.7V.

Does MP6922AGN-Z require external bootstrap capacitors?

No, MP6922AGN-Z does not use bootstrap architecture. It employs direct gate drive with internal charge pump and rail-to-rail output swing (0.1V low, 14.5V high at VDD >16V), eliminating need for external bootstrap diodes or capacitors and simplifying layout in high-density adapters.

How is thermal shutdown implemented?

Thermal shutdown activates at 150°C junction temperature, pulling both VG1 and VG2 low to halt synchronous rectification. Operation resumes automatically when junction temperature falls to 120°C, providing 30°C hysteresis. This protects MOSFETs and transformer insulation without requiring external thermal sensors or reset circuitry.