Synchronous buck regulators deliver POL conversions for infotainment and ADAS

April 11, 2016 // By Julien Happich
Intersil has launched a family of monolithic synchronous buck regulators that step-down 5V and 3.3V primary rails to point-of-load (POL) inputs as low as 0.6V for GPUs, FPGAs, DSPs and SOCs.

The ISL78233, ISL78234 and ISL78235 deliver 3A, 4A and 5A, respectively, of continuous output current to infotainment head units and advanced driver assistance systems (ADAS) employing forward-looking smart cameras to detect and classify objects.

The pin-compatible sync buck regulators allow system designers to make a simple BOM change and drop in the right device to their PCB to address the varying load requirements of entry-level to luxury car models.
The ISL7823x synchronous step-down DC/DC converters use a current mode control architecture to deliver fast transient response and excellent loop stability. They integrate low RDSon high-side PMOS and low-side NMOS MOSFETs to reduce external component count and power losses while offering 100% duty cycle operation. The ISL7823x combine a switching frequency of 2MHz with guaranteed 100ns (max) minimum on time to avoid AM radio channel interference and allow designers to use lower value inductors and smaller capacitors. The ISL7823x family’s guaranteed minimum on time provides the wide step-down ratio necessary to deliver a 1V POL supply at high switching frequencies. The chips support an input voltage range from 2.7V to 5.5V and deliver high efficiency up to 95%. Their switching frequency is adjustable from 500kHz to 4MHz, with 2MHz default. AEC-Q100 qualified for operation from -40°C to +125°C, the devices come in a 5x5mm 16-lead WFQFN package or a 3x3mm TQFN package.

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