Monolithic Power Systems Inc. MP6907GS

Overview

MP6907GS from Monolithic Power Systems is a fast-turn-off flyback synchronous rectifier controller IC designed to replace Schottky diodes in high-efficiency AC/DC adapters and offline flyback converters. It regulates external MOSFET conduction to maintain ~70mV forward drop, supports CCM/DCM/QR operation modes, features 25ns total turn-off delay, 4.2V–35V VDD range, and operates in SOIC8 package with PGND/VDD/VG/VD/VSS/LL/EN/SYNC terminals.

For engineers reviewing the MP6907GS datasheet, MP6907GS pinout, MP6907GS application, or MP6907GS equivalent, this device is selected for high-efficiency secondary-side rectification where fast MOSFET turn-off, light-load efficiency optimization (~150μA quiescent current), and reliable CCM operation via SYNC interface are critical design requirements.

Technical Context

The MP6907GS implements adaptive gate control using VD–VSS sensing to regulate MOSFET on-resistance dynamically, maintaining ~70mV forward voltage during conduction. Its turn-on blanking time (~1.6μs) and turn-off blanking (160ns) prevent false triggering during switching transients.

It integrates dual-mode light-load management: resistor-programmable timing via LL pin (1.4–2.5μs pulse width) and SYNC-triggered latch-off (>100μs high). Thermal shutdown activates at 150°C with 10°C hysteresis, and UVLO ensures operation only above 3.97V VDD.

Key Specifications

Pinout & Package

MP6907GS is housed in an 8-pin SOIC package with exposed thermal pad (not electrically connected). Pin functions are validated per MPS Rev. 1.02 datasheet and support both high-side and low-side synchronous rectifier configurations.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4306DR2G and IR11672, MP6907GS uniquely combines sub-100ns turn-off, SYNC-controlled CCM operation, and resistor-programmable light-load timing in a single SOIC8 package-enabling compact, high-efficiency, standards-compliant flyback designs without external bias or timing components.

Availability

MP6907GS is available at Aetrix Electronics and suitable for laptop AC adapters, USB PD fast-charging supplies, and industrial IoT power systems requiring stable component supply, long lifecycle support, and RoHS-compliant sourcing.

Supply support for MP6907GS 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, and global manufacturing partnerships.

The MP6907 product line targets high-efficiency offline AC/DC conversion, specifically addressing efficiency, thermal, and regulatory challenges in flyback-based power supplies for consumer, industrial, and medical applications.

FAQ

What is the maximum drain voltage the MP6907GS can sense on the VD pin?

The MP6907GS VD pin supports a guaranteed operating range of −1V to +180V relative to VSS, enabled by an integrated high-voltage JFET input stage. This eliminates the need for external voltage dividers or clamps in standard flyback topologies, even with reflected primary spikes up to 180V.

How does the MP6907GS achieve ~70mV forward voltage regulation?

The MP6907GS continuously monitors V_DS (VD–VSS) and adjusts VG drive strength to maintain conduction until V_DS rises to approximately −70mV, then initiates turn-off. This closed-loop control ensures consistent conduction loss (P ≈ I_SD × 70mV), independent of MOSFET R_DS(ON).

Can the MP6907GS be used in high-side synchronous rectification configurations?

Yes-the MP6907GS supports both high-side and low-side rectification. In high-side configuration, VSS connects to the MOSFET source (floating), VD connects to drain, and PGND serves as power return. Layout must isolate VD/VSS sensing from power loops to avoid noise coupling.

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

The LL pin sets light-load entry timing via an external resistor (R_LL). With R_LL = 100kΩ, T_LL = 1.95μs; values scale linearly. Pulling LL low disables the gate driver entirely. Leaving LL open prevents light-load mode activation-ensuring full operation under all loads.

Does the MP6907GS require an external bootstrap capacitor for gate driving?

No-the MP6907GS integrates a charge pump and does not require an external bootstrap capacitor. Its VG output delivers 10–13V drive referenced to VSS, sufficient for standard and logic-level MOSFETs, with 0.5A peak source/sink current and <1.6Ω pull-down impedance.

How does the SYNC pin improve reliability in continuous conduction mode?

The SYNC pin accepts a TTL/CMOS-compatible signal (>2.12V threshold) to force immediate VG pull-down, preventing shoot-through during CCM overlap periods. This external control overrides internal timing, ensuring precise MOSFET turn-off synchronized with primary-side controller signals.

What thermal protection mechanisms are built into the MP6907GS?

The MP6907GS includes junction temperature monitoring with thermal shutdown activation at 150°C and automatic recovery at 140°C (10°C hysteresis). During shutdown, VG is pulled low and internal logic halts-preventing thermal damage while allowing safe restart once temperature decreases.