A4409

A4409 Adjustable Frequency Buck or Buck-Boost Pre-Regulator with 2 LDOs, Window Watchdog Timer, and NPOR FEATURES AND BENEFITS Automotive AEC-Q100 qualified VIN operating range from 3 to 36 V, with 40 V maximum Buck or buck-boost pre-regulator (VREG) Adjustable PWM switching frequency: 250 kHz to 2.4 MHz PWM frequency can be synchronized to external clock Two 5 V internal LDO regulators with foldback short- circuit protection Power-on reset (NPOR) with fixed delay of 22.5 ms Programmable window watchdog timer with a fixed activation delay of 30 ms Active low, watchdog timer enable/disable pin (WDENn) Dual bandgaps for increased reliability: □□BG1 for VREG, 5V0, and VCP reference □□BG2 for V5 reference, and VREG, 5V0, and VCP fault detection Ignition-enable input (ENBAT) Frequency dithering helps reduce EMI/EMC Undervoltage protection for all output rails Pin-to-pin and pin-to-ground tolerant at every...