Allegro buck/boost controller targets automotive applications

Allegro MicroSystems introduces an automotive AEC-Q100 qualified power management IC. The A4450 can implement either a buck or buck/boost regulator to efficiently convert automotive battery voltages into a tightly regulated voltage, with seamless transition between the buck and boost modes. The device is targeted at the automotive, industrial and instrumentation markets with end applications to include infotainment, instrument clusters, telematics, amplifiers, and control modules.


The A4450 targets 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 wide input operating voltage range of 3 V to 36 V makes the A4450 suitable for a range of automotive infotainment applications and handles idle stop/start, cold crank, double battery and load dump conditions. The A4450 features high-voltage battery compatible enable input to accommodate for switched battery input applications. The A4450 provides regulated output voltage ranging from 3 to 8 V with load current of up to 1 Adc. The PWM switching frequency range is 250 kHz to 2.4 MHz, and frequency dithering and controlled switching transitions minimize EMI. Protection features include pulse-by-pulse current limit, hiccup-mode short-circuit protection, LX short-circuit protection, and missing freewheeling. The device is available in a 20-lead, 4 mm x 4 mm QFN package. Allegro MicroSystems: www.allegromicro.com

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