The type-c interface has many modern advantages such as forward and backward insertion, high-speed data transmission, and high-power charging, and has been favored by many terminal manufacturers and quickly applied to products since its launch. The USB PD protocol has good fast charging compatibility, as well as data transmission capacity of up to 40Gbps, supporting applications in mobile phones, laptops, high-end displays, and storage devices.

The transmission of higher power and the carrying of high-speed data have also put forward new requirements for other protection and security measures of the type-c interface. To prevent static electricity from damaging bus equipment, protecting devices is essential. For type-c interface protection, overcurrent protection chips, overvoltage protection chips, and electronic fuse chips that support both overcurrent and overvoltage protection have been introduced, which can be flexibly selected according to different usage scenarios.

Shanghai Weian Electronics was established in 1996, with products including power semiconductors, mixed signal chips, power management chips, signal chain chips, and circuit protection devices. Its product applications include communication, battery packs, handheld devices, automotive electronics, industrial equipment, and consumer electronics industries. Weian is committed to continuously meeting market and customer requirements, focusing on product quality.

In 2016, load switch products and overvoltage protection chips were launched. In 2020, the product line continued to be improved, and overvoltage protection chips were introduced, including type-c protection products with built-in overvoltage and electrostatic protection, and electronic chip products that support overcurrent and overvoltage protection. And in 2021, an overvoltage protection chip supporting 100V withstand voltage was launched.

WP5801 is a protection chip used for type-c interface. The chip supports 24V overvoltage protection, CC, SBU pin static protection, and built-in ESD array, which can be used for static protection of data pins, saving external ESD chips, and has comprehensive protection functions.

The launched load switches support overcurrent protection, and the chips are divided into WP25P series with adjustable protection current and WP25X series with overcurrent signal output. Both load switches support enable control, control circuit switches, and overcurrent protection functions.

WP25P041T5 is a low current load switch that supports output from 75mA to 400mA, with reverse current blocking and a maximum of 1 off current μ A. With 15 μ S Fast short circuit response time, built-in EN pin Pull-up resistor, support output over-voltage protection function, with its own output discharge, support undervoltage protection and thermal shutdown.

WP25P021 is a load switch that supports 2A current, supports 400mA to 2A output, has reverse current blocking, and has 2 μ S fast short-circuit response time, static current only 28 μ A. Maximum current when closed 1 μ A. Built in EN pin Pull-up resistor, with output discharge when turning off, supports undervoltage protection and thermal shutdown.

The overvoltage protection chip is divided into two types: adjustable and fixed protection voltage, with the 12Pin packaged model supporting EN control and status output.

WP3881 is an overvoltage protection chip that supports 4.8A continuous current and is equipped with a 35m Ω NMOS transistor for circuit switching. The input voltage supports 2.5-28V, the overvoltage lockout protection voltage is 5.95V, the overvoltage protection response time is 100nS, the overvoltage protection threshold can be set from 4-20V, the input jitter removal time is 21mS, and the built-in overheating protection supports 100V surge.

WP3116 is a high current overvoltage protection chip that supports 4.5A continuous current and is equipped with an NMOS protection tube with a built-in resistance of 30m Ω. The overvoltage blocking protection voltage is 5.95V, supporting 100V surges, and has a 50nS response time.

WP3883CL is an overvoltage protection chip that supports 4A output current, with a built-in NMOS protection transistor with a conductivity of 29m Ω. The input voltage range is 2.5-28V, and the overvoltage lockout protection voltage is 6.8V, with a 50nS response time. The overvoltage protection threshold can be freely set between 4-20V, with an input jitter removal time of 15mS and a built-in overheat shutdown protection function.

In terms of electronic fuses, Weian has launched two devices, namely WP1430 with fixed parameters and WP1111 with support for lithium battery front-end protection.

WP1430 has a built-in 110m Ω NMOS, an input voltage range of 2.5-36V, an built-in overvoltage protection voltage of 6.1V, and supports 2.5A overcurrent protection. The output overvoltage response time is less than 500nS, and the input jitter removal time is 16mS. It also has a built-in overheat shutdown protection function.

WP1111 is an adjustable EFUSE electronic fuse with overcurrent protection, featuring 1 μ The input overvoltage response time of S has programmable overcurrent protection and current limitation, supports lithium battery front-end protection, and supports 30V input voltage. Supports 1.5A output current, has overheat shutdown protection function, supports enable control and status output.

Summary: As more and more products use type-c interfaces, there are also more and more corresponding accessories. Built-in protective devices in the device can prevent incorrect use of accessories, which can lead to overvoltage or overcurrent situations and cause equipment damage. Weian has launched a series of type-c interface protection chips that support input overvoltage, overcurrent, and electrostatic protection, providing a one-stop protection solution for devices to ensure stable and reliable use.

Source: Charging head network