30V common-drain n-mosfet for bi-directional USB power

Toshiba has launched its first 30V n-channel common-drain dual mosfet, for controlling bi-directional power flow in USB-connected devices.

The USB Power Delivery standard supports power levels from 5V 3A to 48V 5A, and allows swapping of the power supply and receiving side, requiring devices with USB charging to support bi-directional power.

In developing a 30V common drain mosfet, called SSM10N961L, the company is aiming at rails commonly found in laptops and tablets – it already makes similar 12V dual mosfets for Li-ion battery packs.

Packaging is Toshiba’s 3.4 x 1.5 x 0.11mm TCSPAG-341501 (left).

The new part typically offers a source-source (through both mosfets) on-resistance of 9.9mΩ, and can handle 9A when mounted on an 18µm 407mm² (~20mm square) copper pad, rising to 14A on a 70µm 687.5mm² (~26mm) pad. That resistance is with 10V on the gates, and increases to 13.6mΩ (17.6mΩ max) at 4.5V.

To implement a load switch with a back-flow prevention or a power multiplexer, the company makes the TCK42xG family of dual gate driver ICs, and it has created a 20 x 20mm power multiplexer evaluation board (‘RD221B Mux6’) that switches 3A between 20V and 9V inputs and an output, with a choice of break-before-make and make-before-break operation.

SSM10N961L mosfet product page

Eval board product page