Monolithic Power Systems Inc. MP6922DN-LF-P

Overview

MP6922DN-LF-P from Monolithic Power Systems is a dual-channel fast turn-off intelligent synchronous rectification controller for LLC resonant converters, regulating MOSFET V_DS to 70 mV with 20 ns total turn-off delay and supporting CCM/CrCM/DCM operation modes. It integrates reverse current protection (RCP), light-load latching (<600 µA quiescent current), and operates from 8 V to 24 V V_DD. Used in high-efficiency AC-DC adapters delivering 12 V/15 A.

For engineers reviewing the MP6922DN-LF-P datasheet, MP6922DN-LF-P pinout, MP6922DN-LF-P application, or MP6922DN-LF-P equivalent, key selection criteria include V_DS regulation accuracy (±15 mV), RCP latch time (100 µs), SOIC8E thermal resistance (θ_JA = 50 °C/W), and compatibility with standard/logic-level N-CH MOSFETs in high-frequency LLC topologies.

Technical Context

The MP6922DN-LF-P implements adaptive gate control using dual independent voltage-sense paths (VD1/VS1 and VD2/VS2) to regulate forward conduction voltage across external N-CH MOSFETs to ~70 mV via dynamic r_DS(on) adjustment. Its blanking logic enforces minimum on-time (~1 µs) and off-time (1.6 µs) to prevent shoot-through during transient switching in CCM.

It features integrated Reverse Current Protection triggered at VRCP = 3 V on the RCP pin, latching both gate drivers for 100 µs, and a light-load mode entered after 120–150 µs delay when MOSFET conduction pulse width falls below 2.2 µs - configurable via external resistor on LL pin in SOIC14 variants but fixed in SOIC8E.

Key Specifications

Pinout & Package

MP6922DN-LF-P is packaged in SOIC8E (exposed pad), offering enhanced thermal performance (θ_JA = 50 °C/W) versus standard SOIC8. The exposed PGND pad improves heat dissipation and EMI grounding in high-current synchronous rectifier layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6922DN-LF-P, MP6923DN-LF-Z sacrifices channel count and RCP for cost reduction in simpler topologies, while UCC24612-2QDRQ1 trades higher voltage capability and faster turn-off for automotive qualification and lower V_DS rating - neither offers direct functional equivalence in dual-channel, high-voltage, RCP-enabled LLC designs.

Availability

MP6922DN-LF-P 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-term lifecycle support.

Supply support for MP6922DN-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 leadership in DC-DC conversion, motor drivers, and power management solutions.

The MP6922 belongs to MPS's intelligent synchronous rectifier controller product line, designed specifically to replace Schottky diodes in high-frequency resonant converters while meeting global energy efficiency standards.

FAQ

What is the maximum drain voltage the MP6922DN-LF-P can sense on VD1 and VD2 pins?

The MP6922DN-LF-P supports VD1 and VD2 input voltage ranges from −0.7 V to +180 V relative to their respective VS pins. This allows direct sensing of high-voltage synchronous rectifier nodes in 24 V and 48 V output LLC converters without external level-shifting circuitry.

Does the MP6922DN-LF-P require external components for light-load mode configuration?

No - the MP6922DN-LF-P (SOIC8E package) uses a fixed internal light-load timing threshold. Unlike the SOIC14 variant (MP6922DS), it does not expose an LL pin and therefore does not require an external resistor to set light-load entry delay or pulse width.

How does the Reverse Current Protection (RCP) function operate without an external sensor?

RCP uses the dedicated RCP pin as a 5 V internal reference input. An external resistive divider from the MOSFET drain to RCP sets the reverse current detection threshold; when voltage at RCP exceeds 3 V, the IC latches both gate drivers for 100 µs to block reverse conduction.

Can the MP6922DN-LF-P drive both standard and logic-level MOSFETs?

Yes - the MP6922DN-LF-P gate drivers provide high-side compatible output swing (V_G(HI) ≈ V_DD − 2.2 V at V_DD < 16 V, or 14 V at V_DD > 16 V) and strong 3 A sink capability, enabling robust turn-off for both 4.5 V logic-level and 10 V standard-threshold N-CH MOSFETs.

What is the thermal performance difference between SOIC8E and SOIC8 packages?

The SOIC8E package has θ_JA = 50 °C/W versus 90 °C/W for SOIC8 due to its exposed PGND pad. This 45% lower junction-to-ambient thermal resistance allows 2.5 W continuous power dissipation at +25°C ambient, making SOIC8E preferred for high-current, thermally constrained designs.

Is the MP6922DN-LF-P compliant with RoHS and lead-free assembly requirements?

Yes - the "LF" suffix in MP6922DN-LF-P denotes lead-free, RoHS-compliant packaging. All MPS parts adhere to the RoHS directive, and the device is compatible with standard Pb-free reflow profiles including peak temperatures up to 260°C.

What happens during thermal shutdown, and how does recovery work?

When junction temperature exceeds 150°C, the MP6922DN-LF-P pulls both VG1 and VG2 low and halts switching. Recovery occurs automatically once die temperature drops to 120°C (30°C hysteresis), restoring normal operation without requiring EN pin reset or power cycle.