NCV97311A数据手册ONSEMI中文资料规格书

描述 Description

The NCV97311A 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 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

• 5.0 V and 3.3 V Versions Available
• Low Quiescent Current in Standby Mode
• Programmable Spread Spectrum for EMI Reduction
• 2 Microcontroller-Enabled Low Voltage Synchronous Buck Converters
• Large Conversion Ratio of 18 V to 3.3 VBattery Connected Switcher
• Wide Input of 4.1 to 45 V with Undervoltage Lockout (UVLO)
• Fixed Frequency Operation Adjustable from 2.0 to 2.6 MHz
• Internal 1.5 ms Soft−starts
• Cycle−by−cycle Current Limit Protections
• Hiccup Overcurrent Protections (OCP)
• Individual Reset Pins with Adjustable Delays
• QFN Package with Wettable Flanks (pin edge plating)
• NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q100 Qualified and PPAP Capable
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant

应用 Application

• Infotainment
• Instruments clusters
• Body Electronics
• Telematics
• ECU
• Automotive