Buck-Boost DC/DC Handles Wide Input-Voltage Range

A buck-boost DC/DC converter delivers a regulated output voltage even when the input voltage is below or above that required by the load. Buck-boost converters adequately serve the needs of battery-powered consumer devices where the required input range is rather narrow; in many cases from 1.8 to 5.5 VDC. However, the situation is different when it comes to industrial and automotive applications where input voltages can vary over a very wide range.
For example, the automotive battery presents one of the most challenging inputs to a power supply. While its nominal voltage can vary from 10.6 to 15 V, depending on the battery’s state of charge, the ambient temperature, and the alternator, cold-crank conditions can push the rail below 4 V and line transients can produce 40 V spikes. That means it can vary from less than 4 V to over 40 V. In addition, experts say that the automotive power rail is also subject to a variety of dynamic disturbances produced by changes in the engine, transitioning loads, and inductive transients in the wiring harness.
Add NewBuck-Boost DC-DC Handles Wide Input-Voltage RangeTo address the needs of industrial and automotive applications, power semiconductor suppliers such as Intersil, Linear Technology, and Texas Instruments, among others, have developed a variety of low-noise, high-performance, wide-input buck-boost DC/DC converters.

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