Monolithic Power Systems Inc. MP6924AGS-P

Overview

MP6924AGS-P from Monolithic Power Systems is a dual-channel, fast-turn-off synchronous rectifier IC for LLC resonant converters operating in CCM, CrCM, and DCM modes. It drives two N-channel MOSFETs with 29mV forward-voltage regulation, 35ns total turn-off delay, and 175µA light-load quiescent current, enabling high-efficiency secondary-side rectification in notebook adapters and isolated DC/DC supplies.

For engineers reviewing the MP6924AGS-P datasheet, MP6924AGS-P pinout, MP6924AGS-P application, or MP6924AGS-P equivalent, key selection criteria include V_fwd accuracy (±12mV), SOIC-8 package thermal resistance (θ_JA = 90°C/W), CCM/DCM mode compatibility, and LL-pin programmable light-load timing-critical for optimizing efficiency across load transients in AC/DC power systems.

Technical Context

The MP6924AGS-P implements adaptive voltage-sensing control to regulate MOSFET conduction at V_fwd = 29mV ±12mV, using independent VD1/VSS and VD2/VSS sensing paths with 1.75µs turn-off blanking for noise immunity. Its gate drivers deliver 13V high-side output and 0.1V low-side pull-down with 0.6Ω impedance, supporting both high-side and low-side rectification topologies.

Light-load operation is controlled via external resistor on LL pin, setting T_LL = 2.3µs × (100kΩ/R_LL) and enabling latch-off after 45–121µs delay. Thermal shutdown activates at 175°C with 10°C hysteresis, while UVLO engages below 3.7V and releases above 4.2V on VDD.

Key Specifications

Pinout & Package

MP6924AGS-P is housed in a standard SOIC-8 package with exposed pad not electrically connected. Pin functions are validated per Monolithic Power Systems Rev. 1.02 datasheet (2017).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6924GS-P, MP6924AGS-P delivers tighter V_fwd tolerance and superior noise immunity for high-density adapters; versus NCP4306DR2G, it integrates dual-channel control and programmable light-load timing in one SOIC-8 device-reducing BOM count and layout complexity.

Availability

MP6924AGS-P is available at Aetrix Electronics and suitable for AC/DC adapters, PC power supplies, and isolated DC/DC converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6924AGS-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.

The MP6924A product line targets high-efficiency LLC synchronous rectification, designed specifically to replace Schottky diodes in resonant converters where fast turn-off, low V_fwd, and light-load optimization are critical.

FAQ

What is the minimum recommended R_DS(on) for MOSFETs used with MP6924AGS-P?

The datasheet specifies R_DS(on) should be no lower than ~V_fwd/I_OUT. For a 10A output with V_fwd = 29mV, minimum R_DS(on) is 2.9mΩ. Using lower values causes excessive gate drive attenuation, negating R_DS(on) benefits and increasing t_Don.

Can MP6924AGS-P drive logic-level MOSFETs directly?

Yes. The VG1/VG2 outputs deliver 13V high-level drive with 0.6Ω pull-down impedance, fully compatible with standard and logic-level N-channel MOSFETs rated for V_GS ≤ 16V. No external level shifter is needed.

How does the LL pin affect startup behavior?

If LL is left floating, light-load mode is disabled and the IC operates continuously. If LL is pulled low at power-up, the IC enters shutdown with 175µA current and remains inactive until LL rises above 0.3V. Pulling LL high during operation triggers latch-off after the programmed delay.

What is the purpose of the 1.75µs turn-off blanking time?

This extended blanking window prevents false turn-off triggering from voltage spikes during MOSFET commutation-especially critical in high-dV/dt LLC transformers. It improves EMI robustness without compromising CCM transient response, unlike the 210ns blanking in MP6924.

Does MP6924AGS-P require external components for basic operation?

Only three external components are mandatory: a ≥1µF VDD decoupling capacitor, an LL timing resistor (if light-load mode is used), and Kelvin traces for VD1/VSS and VD2/VSS. No bootstrap capacitors, op-amps, or timing RC networks are required.

How does thermal shutdown recovery work?

When junction temperature exceeds 175°C, VG1 and VG2 are pulled low to halt rectification. The IC remains latched off until temperature drops by 10°C (to 165°C), then resumes normal operation automatically-no reset or power cycle is needed.

Is MP6924AGS-P pin-compatible with MP6924GS-P?

Yes. Both share identical SOIC-8 pinout, electrical ratings, and functional block diagram. The only differences are internal: V_fwd threshold, blanking time, thermal trip point, and anti-bounce logic presence-requiring no PCB layout change for upgrade.