The ISL78233, ISL78234 and ISL78235 have been designed to deliver 3A, 4A and 5A, respectively, of continuous output current to infotainment head units and advanced driver assistance systems (ADAS). Pin-compatible these 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 differing car models.
The ISL7823x synchronous step-down DC/DC converters use a current mode control architecture to deliver fast transient response and loop stability and 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 device combines 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. Competing solutions often do not guarantee the low duty cycle needed to deliver very low outputs to the applications processor at switching frequencies above the AM band. This increases the risk of failing the system designer’s electromagnetic interference (EMI) requirements, which leads to costly redesigns and further testing.
The ISL78235 can be combined with the ISL78233 3A synchronous buck regulator, ISL78234 4A synchronous buck regulator, ISL78113A synchronous boost converter, ISL78201 40V/2.5A regulator, ISL78206 40V/2.5A synchronous buck controller, and ISL78302 dual LDO to provide a complete off-battery to POL power supply for an automotive infotainment head unit.