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A New Approach to Circuit Breaker Design Using Silicon Carbide Switches - Nov 21
Mechanical circuit breakers can be low cost with minimal losses, but they operate slowly and wear out. Solid state versions overcome the problems and are becoming increasing viable as replacements at...
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Buck/boost controller has integrated buck MOSFET
The A4450 can convert automotive battery voltages into a tightly regulated voltage, with seamless transition between the buck and boost modes, says the company. This regulator is targeted at the automotive, industrial and instrumentation markets for use in infotainment, instrument clusters, telematics, amplifiers, and control modules.

It is designed for automotive input environments where battery input voltage supply can vary above and below the required output voltage, and a single- inductor/single-stage conversion is desired. The input operating voltage range is wide, from 3.0 to 36V, and the regulator handles idle stop/start, cold crank, double battery and load dump conditions. A high-voltage battery compatible enable input accommodates switched battery input applications.

Regulated output is 3.0 to 8.0V with load current of up to 1A DC. The PWM switching frequency range is 250 kHz to 2.4MHz. Frequency dithering and controlled switching transitions minimise EMI. Stability is maintained even when the input and output voltages are at nearly the same level, as well as through line and load transient events.

Protection features include pulse-by-pulse current limit, hiccup mode short-circuit protection, LX short-circuit protection, missing freewheeling diode (buck diode at LX node). The enable input is compatible to a high-voltage battery level, and a power-on reset output is integrated.

The device is available in a 20-lead, 4.0 x 4.0mm QFN package, which is “wettable flank” and AEC-Q100 qualified. 

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