描述 Description

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.

特性 Features

? Hiccup Overcurrent Protections
? Reduce power during short-circuit events
? Individual Reset Pins with Adjustable Delays
? Voltage Monitoring
? Programmable Spread Spectrum
? EMI Reduction
? QFN Package with Wettable Flanks (Pin Edge Plating)
? Aids in visual inspection of solder joints
? 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

應(yīng)用 Application

? Infotainment
? Body Electronics
? Telematics
? ECU
? Automotive