Intersil’s 2.5A Buck Regulator Operates During ‘Cold Crank’ Conditions

9 NOVEMBER 2011

Intersil Corporation has released a new 2.5A step-down regulator that automatically boosts the input voltage to maintain regulation.
Loss of regulation due to drooping input voltage is a common problem in automotive applications. Such input dropouts – commonly called ‘cold crank’ conditions – occur when starting a car in cold conditions, but can now occur in vehicles with start-stop operation.
The ISL78200 is a synchronous buck/pre-boost IC that automatically activates a pre-boost stage when required to maintain output regulation. It integrates a low side MOSFET driver along with a 90 milliohm high side MOSFET. The ISL78200 can accommodate a wide input voltage range of 3V to 40V while supplying a regulated 5V, 2.5A output at 85 degrees C without heat sinking. The combination of input voltage pre-boosting and step-down regulation with a low 180uA quiescent current makes the ISL78200 ideal for a wide range of automotive power applications.

Intersil Corporation
www.intersil.com

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