Intersil Americas Inc.

Fairchild Korea Semiconductor Ltd.

Han-Suk Seo

Hang-Seok Choi

Faisal Ahmad

A battery charger comprises charging circuitry for providing a battery charging voltage responsive to an input voltage. First circuitry provides both over-voltage protection and an input voltage bypass signal responsive to the input voltage. The first circuitry includes a low impedance switch having a resistance of at least 500 m&#x3a9; for connecting the input voltage to an output voltage node. The first circuit also includes a higher impedance switch having a resistance of at least 1000 m&#x3a9; for providing the input voltage as a voltage bypass signal.

Over-voltage protected battery charger with bypass

In one embodiment, a power converter generates an output voltage by modulating an input voltage according to operations of a first switch and a second switch connected in a half-bridge arrangement. The power converter includes a switch driver circuit for controlling the turning on and off of the first and second switches. A PWM controller generates a switch driver control signal for controlling the switch driver circuit according to an output voltage. The switch driver circuit generates an on-time control signal for turning off the first switch when the first switch has been turned on for longer than a threshold period.

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Seoul, South Korea

Han-Suk Seo