A4408

A4408 Adjustable Frequency Buck or Buck-Boost Pre-Regulator with a Synchronous Buck, 3 Internal LDOs, Watchdog Timer, NPOR, and FF0/FF1 FEATURES AND BENEFITS Automotive AEC-Q100 qualified 2.8 to 36 VIN operating range, 40 VIN 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 Adjustable synchronous buck regulator (1.25 VNOM) 3.3V (3V3) and 5V (V5) internal LDO regulators with foldback short-circuit protections 5V (V5P) internal tracking LDO regulator with foldback short-circuit and short-to-battery protections TRACK sets either 3V3 or V5 as the reference for V5P Power-on reset (NPOR) with fixed delay of 15 ms Programmable watchdog timer with activation delay Active-low watchdog timer enable pin (WDENn) Dual bandgaps for increased reliability: BGVREF, BGFAULT MODE pin sets the NPOR undervoltage threshold for V5 and V5P Fixed POK5V undervoltage threshold for V5 and V5P Logic enable input (ENB) for microprocessor control Two ignition enable inputs (ENBAT1 and ENBAT2) Continued on next page... APPLICATIONS □□Electronic Power Steering (EPS) □□Transmission Control Units (TCU) □□Advanced Braking Systems (ABS) □□Emissions Control Modules □□Other automotive applications PACKAGE: 38-Pin eTSSOP (suffix LV) Not to scale DESCRIPTION The A4408 is power management IC that uses a buck or buck-boost pre-regulator to efficiently convert au...