Multi-output Power Management Unit (PMU) with 3 Buck Regulators



The NCV97310 is 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 36 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 synchronous switchers. Each downstream output is adjustable from 1.2 V to 3.3 V, with a 1.5 A current limit and a constant 2 MHz switching frequency. Each switcher has independent enable and reset pins, 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 uA. 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.

  • Infotainment
  • Body Electronics
  • Telematics
  • ECU
  • Automotive
  • 5.0 V and 3.3 V Primary Output Versions Available
  • Low Quiescent Current in Standby Mode
  • Programmable Spread Spectrum
  • 2 Microcontroller-enabled Low Voltage Synchronous Buck Converters
  • Large Conversion Ratio of 18 V to 3.3 V for Battery-Connected Switcher
  • Wide Battery Input of 4.1 V to 45 V with Undervoltage Lockout (UVLO)
  • Fixed Frequency Operation Adjustable from 2.0 MHz to 2.6 MHz
  • Internal 1.5 ms Soft-Start for All 3 Switchers
  • Cycle-by-cycle Peak Current Limit Protections
  • Hiccup Overcurrent Protections
  • Individual Reset Pins with Adjustable Delays
  • QFN Package with Wettable Flanks (Pin Edge Plating)
  • These Devices are Pb-Free, Halogen-Free/BFR-Free and are RoHS Compliant
  • Battery Overvoltage Protection
  • Standby Rail Supplied by a Low-Iq LDO


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