Monolithic Power Systems Inc. MP6910AGS-Z

Overview

MP6910AGS-Z from Monolithic Power Systems is a CCM/DCM flyback synchronous rectifier IC integrating a 100V/15mΩ MOSFET, designed to replace secondary-side diodes in AC-DC adapters. It regulates V_DS to 65mV during conduction and achieves 30ns turn-off delay, enabling >94% efficiency in 30W QC chargers at 265VAC input.

For engineers reviewing the MP6910AGS-Z datasheet, MP6910AGS-Z pinout, MP6910AGS-Z application, or MP6910AGS-Z equivalent, this device requires attention to VDD sourcing (8.3–24V), SENSE pin overvoltage protection, high-side/low-side rectification compatibility, and light-load latch-off timing (t_LL = 2.2μs).

Technical Context

The MP6910AGS-Z implements adaptive gate control with 100ns turn-on and 30ns turn-off delays, using V_DS sensing to regulate forward voltage drop to 65mV across load currents from 0.5A to 11.8A. Its blanking circuit enforces 1.0μs minimum on-time and dynamically adjusts turn-off threshold from −30mV to −50mV during blanking.

It supports dual-mode operation: normal synchronous rectification with V_DS-regulated conduction, and light-load latch-off mode triggered when conduction period falls below 2.2μs for >120μs-reducing driver loss by disabling gate drive until body-diode conduction exceeds −190mV for >2.5μs.

Key Specifications

Pinout & Package

MP6910AGS-Z is housed in a standard SOIC-8 package (JEDEC MS-012, variation AA) with exposed pad not connected internally; thermal performance relies on PCB copper area and vias per recommended land pattern (5.4mm × 1.6mm pad, 0.61mm solder mask opening).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4306DR2G and SiHP065N10E+IR11672, MP6910AGS-Z trades marginal efficiency gain for significant BOM reduction, simplified layout, and guaranteed timing coordination between sense and drive-critical for robust operation in cost-sensitive, high-volume QC adapters.

Availability

MP6910AGS-Z is available at Aetrix Electronics and suitable for laptop adapters, USB PD quick chargers, and industrial flyback converters requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP6910AGS-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 analog and power ICs, with design centers in the US, China, and Taiwan, and manufacturing partners qualified to AEC-Q200 and ISO 9001 standards.

The MP6910A belongs to MPS's intelligent synchronous rectifier product line, engineered specifically for high-efficiency, low-noise flyback conversion in consumer and industrial power supplies where integration, reliability, and ease of qualification are critical.

FAQ

What is the maximum continuous output current supported by MP6910AGS-Z?

The MP6910AGS-Z supports up to 2.5A continuous output current in universal-input (90–265VAC) 30W flyback adapters, based on thermal limits: at 265VAC input, its total power loss (controller + conduction + reverse recovery) remains within the 1.8W maximum dissipation limit for SOIC-8 at 67°C/W θ_JA, assuming 4-layer PCB with 2 oz copper and 6 thermal vias under the exposed pad area.

How should the SENSE pin be protected against overvoltage during body-diode conduction?

An external resistor of 300Ω to 1kΩ must be placed between the SENSE pin and the MOSFET drain (V_D) to limit peak voltage during body-diode forward conduction. Values below 300Ω increase power loss in the resistor; values above 1kΩ degrade V_DS sensing accuracy and may cause premature turn-off. The resistor must be placed adjacent to the IC with minimal trace length.

Can MP6910AGS-Z operate in high-side rectification configurations?

Yes-MP6910AGS-Z supports high-side rectification by deriving V_DD from an auxiliary winding on the flyback transformer. In this configuration, the VS pin connects to the transformer secondary high-side node, and the SENSE pin monitors V_D referenced to that same node. Figure 9 in the datasheet provides the validated schematic and layout guidelines.

What triggers entry into light-load latch-off mode, and how does exit occur?

Entry occurs when the MOSFET conduction period falls below 2.2μs for longer than 120μs; the gate driver latches off and quiescent current drops to 350μA. Exit occurs when the body diode conducts long enough for V_DS to fall below −190mV for >2.5μs, after which synchronous rectification resumes with full gate drive. This hysteresis prevents oscillation near the transition threshold.

Is MP6910AGS-Z compatible with quasi-resonant (QR) flyback controllers?

Yes-MP6910AGS-Z operates reliably with QR controllers due to its 100ns turn-on delay and adaptive blanking, which accommodate variable switching frequency and valley-switching timing. Its −30mV turn-off threshold ensures clean turn-off even during deep valleys where V_DS undershoot may reach −500mV, preventing false triggering.

Does MP6910AGS-Z require an external bootstrap capacitor?

No-MP6910AGS-Z uses a charge-pump-based gate driver architecture powered directly from V_DD. It does not require a bootstrap capacitor or high-side floating supply, simplifying layout and eliminating failure modes associated with bootstrap diode/capacitor aging or insufficient recharge time at low duty cycles.

What is the recommended PCB layout practice for minimizing noise coupling into the SENSE pin?

The SENSE trace must be routed as a short, direct connection from the SENSE pin to the external 300–1kΩ resistor, with the resistor placed adjacent to the IC. Avoid routing SENSE near high-dv/dt nodes (e.g., primary switch or transformer snubber). Use ground guard traces on both sides of the SENSE line and avoid sharing return paths with power or gate-drive loops.