Resettable e

Toshiba has expanded its range of eFuse circuit breaker ICs with a 53mΩ version that trips in 320ns, all in a 3 x 3mm package.

Dubbed TCKE712BNL, it is aimed at consumer goods including cameras, cordless cleaners, cleaning robots, power tools, speakers, thermostats and wireless chargers.

“Being automatically reset by an internal logic signal, unlike conventional glass fuses, they are designed to support repeated use,” according to the company. “These devices also offer much faster responsiveness and have a greater breadth of built-in protection functions.”

Cin and the Schottky eat voltage spikes due to wiring inductance when the fuse trips. The TVS is there for ESD.

In this case, one of functions added on top of its adjustable over-current trip is an adjustable over-voltage threshold. There is also an enable pin, adjustable slew rate control for in-rush current reduction, and reverse current blocking – the latter allowing use when multiplexing multiple power sources to a single load.

There is a caveat in the data sheet (section 6): “Toshiba eFuse IC has various protection functions. Be aware that not every function will cause the eFuse IC to cease functioning….. ….. Furthermore, Toshiba highly recommends inserting fail-safe systems into the design.”

One further feature has been included just for you: “A flag function transmits an external signal that will alert engineers of possible faults in the circuit design, so they can be addressed early on in the development process,” said Toshiba.

Operation is over 4.4V to 13.2V (18V abs max), -40 to 85°C and up to 3.65A. Absolute maxes are 18V, 2.4W and 150°C Tj.

Packaging is WSON10.

The TCKE712BNL product page is here and the data sheet here