Monolithic Power Systems Inc. MP6922AGN

Overview

MP6922AGN 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 CCM/CrCM/DCM operation, and integrates reverse-current protection with 150μs latch time - enabling high-efficiency AC-DC power supplies for LCD TVs and telecom SMPS.

For engineers reviewing the MP6922AGN datasheet, MP6922AGN pinout, MP6922AGN application, or MP6922AGN equivalent, key selection criteria include its 30mV V_DS regulation accuracy, 300kHz max switching frequency, SOIC8E exposed-pad thermal performance (θ_JA = 50°C/W), light-load latching (<600μA quiescent current), and dual-channel independent sensing architecture.

Technical Context

The MP6922AGN implements adaptive gate control per channel using independent V_D1/V_S1 and V_D2/V_S2 sense pairs to regulate MOSFET conduction at ~30mV forward drop. Its blanking logic enforces 1μs minimum ON-time and dynamically adjusts turn-off threshold from +30mV to +100mV during turn-on transients to suppress ringing-induced false triggering.

Reverse-current protection operates via RCP pin monitoring with 3V threshold and 150μs latched shutdown; light-load mode activates when MOSFET conducting period falls below 2.2μs, with 160μs entry delay and 50μs OFF-period timeout - both configurable via external resistor on LL pin in SOIC14 variant (not present in SOIC8E).

Key Specifications

Pinout & Package

MP6922AGN is packaged in SOIC8E (exposed pad), offering enhanced thermal performance over standard SOIC8. The exposed PGND pad improves heat dissipation and reduces junction-to-ambient thermal resistance to 50°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6922AGS and MP6922AGSE, MP6922AGN delivers optimal thermal performance (50°C/W) and compact footprint for high-power-density LLC designs, while sacrificing programmable light-load timing and SOIC8 legacy compatibility.

Availability

MP6922AGN is available at Aetrix Electronics and suitable for LCD TV power supplies, telecom SMPS, and high-density AC-DC adapters requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.

Supply support for MP6922AGN 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 targets high-efficiency synchronous rectification in resonant converters, emphasizing fast turn-off, precise V_DS regulation, and integrated protection for next-generation AC-DC power supplies.

FAQ

What is the purpose of the exposed pad on MP6922AGN?

The exposed pad on MP6922AGN is electrically connected to PGND and serves as the primary thermal path. It must be soldered to a large PCB copper area to achieve the rated θ_JA of 50°C/W; omitting thermal vias or insufficient copper reduces power handling capability and risks thermal shutdown.

How does MP6922AGN prevent shoot-through in center-tapped LLC converters?

MP6922AGN prevents shoot-through by monitoring reverse current via the RCP pin. When voltage at RCP exceeds 3V - indicating MOSFET body-diode conduction reversal - it latches both gate drivers off for 150μs, blocking simultaneous conduction in full-wave rectifier configurations.

Can MP6922AGN operate with logic-level MOSFETs?

Yes. MP6922AGN supports logic-level MOSFETs via its gate driver high-side output (V_DD−2.2V min) and low-side pull-down (0.1V max). Its 3A sink current ensures fast turn-off even with high-gate-charge MOSFETs, and 30mV regulation adapts to varying R_DS(on) across device types.

What triggers light-load mode entry in MP6922AGN?

Light-load mode triggers when the MOSFET's conducting period falls below 2.2μs, followed by a 160μs delay. The IC then latches the gate driver off until body-diode conduction ends (V_DS < −300mV) and the subsequent conducting period exceeds 2.4μs, restoring synchronous operation.

Is MP6922AGN compatible with CrCM operation?

Yes. MP6922AGN supports critical conduction mode (CrCM) by detecting zero-current crossing via V_DS sensing. Its 20ns turn-off delay and 1μs blanking time ensure reliable turn-off just before current reversal, minimizing body-diode conduction loss in boundary-mode LLC converters.

What is the maximum drain voltage rating for V_D1/V_D2 pins?

The absolute maximum drain voltage rating for V_D1 and V_D2 is +180V relative to V_S1/V_S2. This allows direct connection to secondary windings in 100–240VAC offline converters with 180V peak rectified voltage, provided external snubbing limits transient overshoot.

Does MP6922AGN require external components for basic operation?

MP6922AGN requires only three external components for basic operation: a V_DD bypass capacitor (100nF), an EN pull-up resistor (if not driven actively), and gate resistors (optional for EMI control). No external timing capacitors or compensation networks are needed.