Controller has integrated buck MOSFET
Qualified to AEC-Q100, a power management IC from Allegro Microsystems Europe, the A4450, can implement either a buck or buck/boost regulator to convert automotive battery voltages into a tightly regulated voltage, with seamless transition between the buck and boost modes.
The device is targeted at automotive, industrial and instrumentation, including infotainment, instrument clusters, telematics, amplifiers, and control modules.
The IC is designed for input environments where battery input voltage supply can vary above and below the required output voltage and where a single- inductor/single-stage conversion is desired. The wide input operating voltage range of 3.0 to 36V makes it suitable for a range of infotainment applications and handles idle stop/start, cold crank, double battery and load dump conditions. There is a high-voltage battery compatible enable input to accommodate switched battery input applications.
Regulated output voltage ranges from 3.0 to 8.0V with load current of up to 1A DC. The PWM switching frequency range is 250kHz to 2.4MHz, and 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. 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.