Monolithic Power Systems Inc. MP6910DZ-LF

Overview

MP6910DZ-LF from Monolithic Power Systems is a fast turn-off intelligent rectifier IC for flyback converters, integrating a 100V/10mΩ MOSFET to replace diode rectifiers. It regulates V_DS to ~70mV during conduction and actively turns off before voltage reversal, enabling up to 1.5W power savings in notebook adapters operating at ≤400kHz with 8–24V V_DD supply.

For engineers reviewing the MP6910DZ-LF datasheet, MP6910DZ-LF pinout, MP6910DZ-LF application, or MP6910DZ-LF equivalent, key selection criteria include its 70mV V_DS regulation accuracy, 30mV turn-off threshold, light-load mode (<300µA quiescent current), compatibility with DCM and quasi-resonant topologies, and TO220-3 package thermal performance (θ_JA = 45°C/W).

Technical Context

The MP6910DZ-LF implements adaptive gate control to maintain V_DS ≈ –70mV during forward conduction by dynamically adjusting driver voltage, independent of load current. Its blanking circuit enforces ≥1.6µs minimum on-time and modifies turn-off threshold to +50mV during blanking to ensure reliable shutdown.

It features dual-mode operation: normal synchronous rectification with 200ns turn-on / 30–45ns turn-off delays, and light-load latch-off mode triggered after 120µs delay when conduction pulses fall below 2.2µs-exiting only when body-diode conduction exceeds –250mV for >2.4µs (2.2µs + 0.2µs hysteresis).

Key Specifications

Pinout & Package

MP6910DZ-LF uses a TO220-3 package with exposed drain pad for thermal dissipation and mechanical mounting. Pin 1 (V_DD) accepts 8–24V bias; Pin 2 (V_D) connects to flyback secondary winding node; Pin 3 (V_S) serves as both source terminal and V_DD reference ground.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar intelligent rectifier applications.

Compared with MP6910A, the MP6910DZ-LF offers proven field reliability in legacy adapters but lacks updated ESD protection and tighter regulation tolerances; versus SRK1001, it delivers lower system cost and faster time-to-market via monolithic integration, though with fixed 100V/10mΩ silicon.

Availability

MP6910DZ-LF is available at Aetrix Electronics and suitable for AC-DC notebook adapters, industrial flyback PSUs, and battery-powered off-line converters requiring stable component supply and long-term obsolescence management.

Supply support for MP6910DZ-LF 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 MP6910 product line targets high-efficiency secondary-side synchronous rectification in isolated flyback converters, specifically addressing energy-saving requirements in consumer and industrial AC/DC power supplies.

FAQ

What is the maximum continuous drain current for MP6910DZ-LF at 100°C case temperature?

The MP6910DZ-LF supports 15A continuous drain current at T_C = 100°C, validated per Absolute Maximum Ratings table. This is enabled by its 10mΩ R_DS(ON), TO220-3 package thermal resistance (θ_JC = 3°C/W), and internal thermal shutdown that activates at 150°C junction temperature.

Can MP6910DZ-LF operate with V_DD derived from a 5V output rail?

No-MP6910DZ-LF requires V_DD between 8V and 24V per Recommended Operating Conditions. A 5V rail falls below the 6.0V UVLO turn-on threshold and will prevent startup. For low-voltage outputs, use an auxiliary winding or external LDO to generate ≥8V bias.

How does the light-load mode reduce power consumption?

Light-load mode latches the internal MOSFET OFF when conduction pulses remain below 2.2µs for more than 120µs, disabling gate drive circuitry and reducing quiescent current to 260–360µA. This eliminates dynamic gate charge loss while preserving fast wake-up via V_DS sensing for load transients.

Is MP6910DZ-LF compatible with high-side rectification in flyback converters?

Yes-MP6910DZ-LF supports both high-side and low-side rectification. In high-side configuration, V_S connects to the transformer secondary's high-voltage node and V_D to output capacitor ground; bias must be supplied via auxiliary winding since V_DD cannot be referenced to output ground.

What is the purpose of the 1.6µs minimum on-time blanking period?

The 1.6µs blanking period prevents false turn-off triggering during MOSFET turn-on transients by ignoring V_DS feedback until gate drive stabilizes. During this interval, the turn-off threshold is raised to +50mV to allow safe shutdown if V_DS spikes abnormally-ensuring robust operation across load and line variations.

Does MP6910DZ-LF require external components for basic operation?

No external components are required for core synchronous rectification. Only V_DD decoupling (e.g., 1µF ceramic) is recommended. Gate drive, regulation, blanking, UVLO, and light-load control are fully integrated-eliminating external resistors, capacitors, or drivers needed in discrete MOSFET+controller solutions.

What failure protections are built into MP6910DZ-LF?

MP6910DZ-LF includes under-voltage lockout (UVLO) with 1.2V hysteresis, thermal shutdown at 150°C junction temperature, and avalanche-rated power switch (597mJ single-pulse). It also features blanking circuits to prevent noise-induced misfiring and a robust gate driver capable of sustaining 100V drain-source voltage during turn-off transitions.