资 源 简 介
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.
