Monolithic Power Systems Inc. MP6910AGS-P

Overview

MP6910AGS-P 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 with -30mV turn-off threshold, enabling high-efficiency operation up to 250kHz in laptop adapters and USB PD/QC chargers.

For engineers reviewing the MP6910AGS-P datasheet, MP6910AGS-P pinout, MP6910AGS-P application, or MP6910AGS-P equivalent, key selection criteria include its integrated 100V MOSFET, 65mV V_DS regulation, SOIC-8 package compatibility, light-load latch-off function (t_LL = 2.2μs), and support for both high-side and low-side rectification topologies.

Technical Context

The MP6910AGS-P implements intelligent gate control using drain-source voltage (V_DS) sensing via the SENSE pin to dynamically regulate the internal MOSFET's on-resistance, maintaining ~65mV forward drop across VS–VD terminals. Its blanking circuit enforces a 1.0μs minimum on-time (t_MIN) and adjusts turn-off threshold to +50mV during blanking to prevent false turn-on.

It features dual-mode operation: normal synchronous rectification under heavy load and light-load latch-off mode triggered when conduction time falls below 2.2μs for >120μs, reducing driver loss. UVLO (6.2–8.2V) ensures safe startup, and thermal shutdown protects against junction temperatures exceeding 150°C.

Key Specifications

Pinout & Package

MP6910AGS-P is housed in a standard SOIC-8 package (JEDEC MS-012, variation AA) with exposed pad not electrically connected. Thermal resistance θ_JA = 67°C/W on 4-layer PCB enables 1.8W max power dissipation at 25°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6910GS-P, the AGS-P variant adds tighter UVLO control and extended temperature validation; versus NCP4307DR2G, it delivers 30% smaller footprint and eliminates gate-drive loop parasitics that degrade turn-off speed.

Availability

MP6910AGS-P is available at Aetrix Electronics and suitable for laptop adapters, USB-C PD quick chargers, and industrial flyback converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MP6910AGS-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 design centers in the US, China, and Taiwan.

The MP6910A product line targets high-efficiency AC-DC conversion in consumer and industrial power supplies, emphasizing integration, thermal robustness, and ease of flyback topology implementation.

FAQ

What is the recommended external resistor value between SENSE and V_D?

A 300Ω to 1kΩ resistor is recommended to limit SENSE pin overvoltage during body-diode conduction, especially in high-voltage flyback designs. Values above 1kΩ degrade V_DS sampling accuracy and may cause premature turn-off; values below 300Ω increase power loss in the resistor without added protection benefit.

Can MP6910AGS-P operate in high-side rectification with V_DD derived from an auxiliary winding?

Yes - Figure 9 in the datasheet shows this configuration explicitly. The auxiliary winding must deliver 8.3–24V to V_DD, and polarity must ensure VS remains the lowest potential node. An external diode (D1) and RC filter (R1/C1) are required to stabilize V_DD under transient loads.

How does the light-load latch-off function improve efficiency?

It disables gate driving when conduction time drops below 2.2μs for >120μs, eliminating driver switching losses. At 250kHz, this reduces quiescent current from 4mA to 350μA, cutting no-load power by >90% compared to continuous operation - critical for Energy Star compliance.

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

At 25°C ambient on a standard 4-layer PCB, the 1.8W max power dissipation limits continuous output current to ~2.5A (per typical 30W flyback data). At 100°C case temperature, derating yields 7.5A continuous drain current, but system-level thermal design determines actual usable current.

Does MP6910AGS-P require a minimum load to maintain regulation?

No - the IC operates down to zero load using its light-load latch-off mode. However, V_DD must remain within 8.3–24V; if powered from output rail, a minimum bleeder resistor may be needed to sustain V_DD during no-load conditions in some topologies.

How is thermal performance affected by PCB layout?

θ_JA drops from 67°C/W to ~45°C/W with 2oz copper, 6 thermal vias under the exposed pad (if present), and 1in² copper pour. Since the SOIC-8 package has no thermal pad, VS and V_D pins must be routed with wide traces and multiple vias to inner ground planes to manage 11.8A current and heat.