Monolithic Power Systems Inc. MP6922DS-LF-P

Overview

MP6922DS-LF-P from Monolithic Power Systems is a dual-channel fast turn-off intelligent synchronous rectification controller for LLC resonant converters, driving two N-channel MOSFETs with 70mV V_DS regulation, 20ns total turn-off delay, and integrated reverse current protection (RCP). It supports CCM, CrCM, and DCM operation up to 300kHz and delivers <600µA quiescent current in light-load latch-off mode-enabling Energy Star-compliant AC-DC adapters.

For engineers reviewing the MP6922DS-LF-P datasheet, MP6922DS-LF-P pinout, MP6922DS-LF-P application, or MP6922DS-LF-P equivalent, key selection criteria include its dual-channel gate drive timing precision, 180V drain-sense capability, SOIC14 package thermal performance (θ_JA = 86°C/W), and RCP threshold at 3V with 100µs latch duration.

Technical Context

The MP6922 implements adaptive V_DS-sensing control per channel to regulate forward voltage drop at ~70mV and trigger turn-off before negative swing, using blanking windows (1µs on, 1.6µs off) to suppress false triggering from ringing. Its dual independent sensing paths (VD1/VS1 and VD2/VS2) enable simultaneous high-side and low-side synchronous rectification in center-tapped or full-wave LLC topologies.

Internal circuitry includes an EN-controlled logic state machine, a 5V RCP reference with external resistor divider interface, and a light-load detection circuit that monitors body-diode conduction time via V_LL-DS (–250mV threshold) and latches gate drivers after 120µs delay when conduction falls below 2.2µs.

Key Specifications

Pinout & Package

MP6922DS-LF-P is supplied in a RoHS-compliant SOIC14 package with exposed thermal pad (not electrically connected), offering θ_JA = 86°C/W and θ_JC = 38°C/W for industrial-grade thermal management in enclosed power supplies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6922DS-LF-P, MP6921DS-LF-Z sacrifices dual-channel capability and RCP for lower BOM cost, while NCP4306DR2G trades 20ns timing precision and 70mV regulation for broader vendor support but reduced light-load efficiency and frequency headroom.

Availability

MP6922DS-LF-P is available at Aetrix Electronics and suitable for AC-DC adapters, LCD TV power supplies, and telecom SMPS requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP6922DS-LF-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 over 20 years of expertise in DC-DC conversion, motor drivers, and power management solutions.

The MP6922 belongs to MPS's intelligent synchronous rectification controller product line, engineered specifically for high-efficiency LLC resonant converters in consumer, computing, and telecom power applications.

FAQ

What is the maximum drain voltage rating for MP6922DS-LF-P's VD1 and VD2 pins?

The absolute maximum drain voltage rating for VD1 and VD2 is –0.7V to +180V relative to VS1/VS2. This allows direct sensing of high-voltage secondary-side MOSFET drains in universal-input AC-DC systems without external level-shifting circuitry, provided proper PCB layout minimizes dv/dt coupling.

How does the light-load latch-off function improve system efficiency?

The MP6922 enters light-load mode when MOSFET conduction time falls below 2.2µs per cycle, latching off gate drivers after a 120µs delay. This reduces quiescent current to <600µA-cutting driver-stage losses by >90% versus continuous operation-directly enabling compliance with 0.5W Energy Star standby limits.

Can MP6922DS-LF-P operate in discontinuous conduction mode (DCM)?

Yes, MP6922DS-LF-P supports DCM, CrCM, and CCM operation modes. In DCM, it turns off the MOSFET when current through the body diode drops to near zero, using the same 70mV V_DS regulation and 20ns turn-off timing to minimize reverse recovery loss and ensure clean zero-current switching.

What is the purpose of the RCP pin and how is it configured?

The RCP pin provides a 5V internal reference for reverse current protection. An external resistor divider scales the sensed drain-source voltage to this reference; when the divided voltage exceeds 3V, the IC latches both gate drivers for 100µs to prevent shoot-through during high-frequency CCM operation in center-tapped topologies.

Does MP6922DS-LF-P require external components for basic operation?

MP6922DS-LF-P requires only three external components for minimal functionality: a VDD bypass capacitor (≥1µF ceramic), an EN pull-up resistor (if not driven actively), and an RCP voltage divider (two resistors). The LL pin resistor is optional and used only to adjust light-load entry timing.

What thermal considerations apply to the SOIC14 package?

The SOIC14 package has θ_JA = 86°C/W and θ_JC = 38°C/W. For reliable operation at full 1.5W dissipation, a 4-layer PCB with ≥2 in² copper pour connected to PGND pins is recommended. Thermal shutdown activates at 150°C with 30°C hysteresis to prevent cycling.

Is MP6922DS-LF-P compatible with both standard and logic-level MOSFETs?

Yes, MP6922DS-LF-P drives both standard-threshold (≥3V V_GS(th)) and logic-level (≤2.5V V_GS(th)) N-channel MOSFETs. Its gate driver delivers 14V high-side output when VDD >16V and VDD–2.2V otherwise, ensuring full enhancement across the supported VDD range (8–24V).