ISL78263

The ISL78263 offers synchronous boost and buck controllers. The boost controller operates either as an independent channel or as a pre-boost function that supplies the buck controller. The low-I_Q buck controller uses only 6µA quiescent current, allowing it to support low-power, always-on operation. Both controllers support wide duty-cycles for switching frequencies from 200kHz to 2.2MHz. Both devices can be synchronized to an external clock and offer programmable spread spectrum clocking to mitigate EMI.

In pre-boost buck mode, the boost of the ISL78263 can be set to activate during falling V_IN transients and continues to operate with an input voltage down to 2.1V. This allows the buck output to maintain regulation, even as the V_IN voltage falls below its output. To support the increase in input current that occurs when V_IN falls, the ISL78263 integrates robust MOSFET drivers to allow the use of multiple FETs in parallel.

ISL78263 is qualified to AEC-Q100 Grade 1 and is specified to operate across an ambient temperature range of -40°C to 125°C. The device is available in a 5mmx5mm, 32 Ld WFQFN (Wettable Flank) package. The features of the ISL78263 make it ideally suited as a front-end regulator for automotive systems that must maintain always-on operation and support severe cold-cranking transients.