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.
- Programmable spread spectrum
- Hiccup overcurrent protections
- Individual reset pins with adjustable delays
- QFN package with wettable flanks (pin edge plating)
- 5.0 V and 3.3 V primary output versions available
- Low quiescent current in standby mode
- 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
- These devices are Pb-free, halogen-free/BFR-free and are RoHS compliant
- Battery overvoltage protection
- Standby rail supplied by a low-Iq LDO
- Infotainment
- Body electronics
- Telematics
- ECU
- Vision systems
