Monolithic Power Systems Inc. MP6925AGS-Z

Overview

MP6925AGS-Z from Monolithic Power Systems is a dual-channel, fast-turn-off synchronous rectifier controller for LLC resonant converters operating in CCM, CrCM, and DCM. It drives two N-channel MOSFETs with 35ns total turn-off delay, regulates forward voltage drop to 45mV (±17mV), supports 4.2V–35V VDD input, and features light-load latch-off at ≤175µA quiescent current - deployed in AC/DC adapters and PC power supplies.

For engineers reviewing the MP6925AGS-Z datasheet, MP6925AGS-Z pinout, MP6925AGS-Z application, or MP6925AGS-Z equivalent, this page delivers verified functional context, SOIC-8 package mapping, dual-channel gate driver timing constraints, VFWD regulation behavior, and real-world noise-immunity design considerations for high-efficiency secondary-side rectification.

Technical Context

The MP6925AGS-Z implements adaptive zero-current detection using VD1/VSS and VD2/VSS differential sensing to trigger MOSFET turn-on when body diode conduction begins (VDS < –230mV), and turn-off when VDS rises above –40mV threshold. Its anti-bounce logic blanks one channel's gate driver during the other channel's active period to prevent cross-conduction.

It integrates configurable light-load entry via external resistor on LL pin (tLL = 2.3µs @ 100kΩ), thermal shutdown at 150°C with 10°C hysteresis, and UVLO with 3.95V rising threshold and 0.185V hysteresis - enabling stable operation across –40°C to +125°C junction temperature range.

Key Specifications

Pinout & Package

MP6925AGS-Z is housed in an industry-standard SOIC-8 package with exposed thermal pad (PGND-connected), optimized for PCB heat dissipation and layout separation of high- and low-side sensing loops.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6925AGS-Z, MP6924AGS-Z reduces channel count and cost but cannot support dual-winding or interleaved LLC topologies, while UCC24612DR trades integrated light-load control and wider VDD range for tighter VFWD tolerance and vendor-specific toolchain alignment.

Availability

MP6925AGS-Z is available at Aetrix Electronics and suitable for AC/DC adapters, PC power supplies, and LCD/LED TV power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for MP6925AGS-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 power management ICs, including DC/DC converters, LED drivers, motor drivers, and synchronous rectifiers.

The MP6925A belongs to MPS's intelligent synchronous rectifier product line, designed specifically to replace Schottky diodes in high-frequency LLC resonant converters while delivering ultra-low VFWD regulation and robust noise immunity.

FAQ

What is the maximum allowable VD voltage swing for MP6925AGS-Z?

The VD1 and VD2 pins are rated for –1V to +180V relative to VSS. This allows direct connection to high-side MOSFET drains in 48V-output LLC converters without external clamping, provided a 1kΩ resistor is placed between VD and the MOSFET drain to limit current during negative excursions below –0.7V.

How does the MP6925AGS-Z prevent shoot-through in CCM operation?

It uses dual-channel anti-bounce logic that blanks VG1 during VG2 conduction and vice versa, enforced by internal timing circuits. Combined with 210ns turn-off blanking (tB_OFF) and 1.1µs turn-on blanking (tB_ON), this ensures minimum dead-time and eliminates cross-conduction even during fast CCM transients.

Can MP6925AGS-Z drive logic-level MOSFETs?

Yes - its VG1/VG2 outputs deliver 11.5V high-level drive (min) when VDD > 10V, sufficient to fully enhance standard and logic-level N-channel MOSFETs. The 0.6Ω pull-down impedance ensures rapid gate discharge, critical for 35ns turn-off performance.

What is the purpose of the LL pin, and how is it configured?

The LL pin configures light-load behavior: connecting a 100kΩ resistor sets tLL = 2.3µs for latch-off entry; leaving it floating disables light-load mode (requiring 22pF capacitor for noise immunity); pulling it low forces immediate shutdown at 175µA. It is not a general-purpose enable pin.

Does MP6925AGS-Z require external components for basic operation?

Yes - minimal support includes one 1µF VDD decoupling capacitor, optional RLL on LL pin, and separate low-inductance VD1/VSS and VD2/VSS sensing paths routed close to respective MOSFETs. No external op-amps, comparators, or timing capacitors are needed for core functionality.

How does VFWD regulation impact MOSFET selection?

VFWD ≈ 45mV defines the target MOSFET conduction voltage drop. For a 10A output, RDS(ON) should be ≥45mΩ to avoid excessive gate drive overhead. Lower RDS(ON) increases QG-related delays (tDON/tDOFF), risking efficiency loss and shoot-through - so tradeoffs must be validated per application.

Is MP6925AGS-Z pin-compatible with earlier MP6925 versions?

Yes - MP6925AGS-Z is the tape-and-reel variant of MP6925AGS in SOIC-8, sharing identical pinout, electrical specs, and thermal characteristics. The "-Z" suffix denotes packaging only; no functional or timing differences exist between MP6925AGS and MP6925AGS-Z.