The A4450 can implement either a buck or buck/boost regulator to convert automotive battery voltages into a tightly regulated voltage, providing a seamless transition between the buck and boost modes. Intended for the automotive, industrial and instrumentation markets end applications include infotainment, instrument clusters, telematics, amplifiers, and control modules.
The A4450 is suitable 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 and has a wide input operating voltage range of 3 V to 36 V. The device features a high-voltage battery compatible enable (EN) input to accommodate for switched battery input applications.
The A4450 provides regulated output voltage ranging from 3 V to 8 V with load current of up to 1 A DC.The PWM switching frequency range is 250 kHz to 2.4 MHz, and frequency dithering and controlled switching transitions minimise EMI. The A4450 is also able to maintain excellent stability 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 in A4450). The enable input is compatible to a high-voltage battery level, and a power-on reset output (NPOR) is integrated.
