STMicroelectronics has introduced new over-voltage protection IC offering a choice of four threshold voltages suitable for battery chargers up to 6,8 V.
The STBP120 protects the charging-control circuitry inside battery-powered portable equipment in case the external charger applies an excessive voltage. A number of variants are available, suitable for a range of charging-voltage levels including USB voltages.
When implemented inside a battery-powered product, the device monitors the voltage from the connected charger. If the detected voltage exceeds a preset threshold, an internal solid-state switch is opened, thereby preventing the over-voltage from damaging the internal circuitry. There are four variants spanning threshold values from 5,375 V to 6,02 V, allowing engineers to optimise for USB chargers at up to 5,25 V or other chargers at higher voltages up to 6,8 V. Each device will protect against over-voltages as high as 28 V. In normal operation the internal switch, an N-channel MOSFET, has very low resistance of 90 m to promote efficiency and minimise heat dissipation.
Other features include a fault-indicator output, soft-start capability to limit inrush current to the charging circuitry, and a thermal shutdown to protect against excessive temperature. The device can save board space and component count in many types of products where over-voltage protection is normally implemented using a discrete transient-voltage suppressor and a fuse. The over-voltage threshold can also be set more accurately than when using discrete devices.
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