Batteries and Portable Power

Semtech Introduces High Voltage ESD Protection Solution For Mobile Phone USB Battery Charging

Semtech Corp. announced the RClamp®3654P, an ESD protection product for battery charging USB ports on mobile phones. The company states that it is the only device on the market with a separate 28V transient voltage suppressor (TVS) diode to protect the VBus against fault conditions when the standard USB port is being used for battery charging.

Semtech’s RClamp3654P complies with China’s new standard for USB charging, making it an suitable component for products targeting that market, or for products that are sold into multiple markets including China. The "Technical Requirements and Test Method of Charger and Interface for Mobile Telecommunication Terminal Equipment" (YD/T 1591-2006) requires all new mobile phones that request network access in China to adopt the new universal battery charger interface.

The RClamp3654P features a low capacitance TVS array to protect USB data (D+, D-) and ID (Accessory Detect) pins up to 5V, while maintaining signal integrity. A separate 28V TVS is integrated to protect VBus; it ensures the protection device remains in high impedance during normal USB operation or when the battery is being charged.

The leakage currents are <0.1µA on the USB TVS and < 0.25µA on VBus TVS, which is results in very low battery drain for portable systems. Its small footprint (1.6 x 1.6 x 0.6 mm) also makes it a suitable solution for space constrained cell phones.

"Mobile phone manufacturers are eager to use USB for power charging because it can lower their costs. Prior to the availability of this device, manufacturers had to develop their own complex protection designs using differently rated discrete components, which impacted design times and took up board space," said Rick Hansen, Semtech Marketing Director for Protection Products. "The RClamp3654P combines protection for all lines in a single device, solving the problem with low clamping voltage, ultra low capacitance and ultra small size that are hallmarks of Semtech’s RailClamp® products."

The RClamp3654P is available immediately in production quantities and is priced at $0.30 each in 1,000-piece lots.

Semtech Corp.
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