Description The NCV97311 is a 3?output regulator consisting of a low?Iq battery?connected 3 A， 2 MHz non?synchronous switcher and two low?voltage 1.5 A， 2 MHz synchronous switchers; all using integrated power transistors. The high?voltage switcher is capable of converting a 4.1 V to 18 V battery input to a 5 V or 3.3 V output at a constant 2 MHz switching frequency， delivering up to 3 A. In overvoltage conditions up to 37 V， the switching frequency folds back to 1 MHz; in load dump conditions up to 45 V the regulator shuts down. The output of the battery?connected buck regulator serves as the low voltage input for the 2 downstream synchronous switchers. Each downstream output is adjustable from 1.2 V to 3.3 V， with a 1.5 A average current limit and a constant 2 MHz switching frequency. Each switcher has an independent enable and reset pin， giving extra power management flexibility. For low?Iq operating mode， the low?voltage switchers are disabled and the standby rail is supplied by a low?Iq LDO （up to 150 mA） with a typical Iq of 30 A. The LDO regulator is in parallel to the high?voltage switcher， and is activated when the switcher is forced in standby mode. All 3 SMPS outputs use peak current mode control with internal slope compensation， internally?set soft?start， battery undervoltage lockout， battery overvoltage protection， cycle?by?cycle current limiting， hiccup mode short?circuit protection and thermal shutdown. An error flag is available for diagnostics.