Driver-MOSFET devices set new benchmarks in graphics

28th September 2020

Caroline Hayes

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The AOZ531x series of DrMOS (driver and MOSFET) devices by Alpha and Omega Semiconductor (AOS) target graphics add-in cards and gaming notebooks.

The AOZ531x DrMOS family is intended for multi-phase voltage regulators (VRs) powering high-performance graphics processor unit (GPU) and memory in desktop add-in graphics cards (AICs) and gaming notebooks. The AOZ531xQI series uses AOS’s latest generation of Gen Alpha MOSFET technology and is packaged in a 5.0 x 5.0mm QFN package. There are three DC current levels for multi-phase voltage regulator optimisation in the series.

The AOZ531xQI can support high peak currents common in a GPU multi-phase VR, says the company. All devices in the AOZ531xQI family have high peak current capability, up to 120A for 10µs and 80A for 10ms.

The DrMOS series tragets gaming platforms with a new performance benchmark in graphics performance. “The latest GPUs from industry leaders like AMD and Nvidia require the support of high frame rates, ray tracing, and multiple high-resolution screens to offer an immersive gaming experience,” explained Peter Cheng, power IC senior marketing director, at AOS. “An efficient, robust power stage plays a critical role in a graphics card performance as the heat sink on a high-performance graphics card touches both the GPU as well as the power stages. Cooler operation results in higher peak performance of the card, and directly translates to a better gaming experience,” he added.

The AOZ531xQI family of DrMOS supports both add-in card (12V input) and gaming laptop (20V input) input voltage operating range. The three performance levels of 50A, 60A, and 65A allow trade offs in the current/phase and number of phases. The AOZ5311, AOZ5312 and AOZ5313QI. DrMOS devices have an operating range of 2.5 to 20V DC. The DC operating range for the AOZ5316, AOZ5317 and AOZ5318QI is 2.5V to 25V.

The AOZ531xQI family is 3.3 and 5V pulse width modulation (PWM) logic-compatible and has true high impedance input at PWM when disabled for phase shedding operation. It is also possible to enable or disable diode emulation. Protection features includesa thermal warning indicator.

The AOZ531xQI series is immediately available in production quantities with a lead-time of 12 weeks.