onsemi NCV78964 2-Phase Boosters/Buck LED Drivers
onsemi NCV78964 2-Phase Boosters/Buck LED Drivers are high‑efficiency, single‑chip 2‑phase boosters and synchronous dual‑buck LED drivers designed for advanced automotive front‑lighting systems. Tailored for high‑current LED applications, the onsemi NCV78964 devices support functions such as high beam, low beam, daytime running lights (DRL), turn indicators, fog lamps, and static cornering illumination. The devices can drive two independent LED strings up to 60V with output currents of up to 1.6A per channel, requiring minimal external components. NCV78964 integrates a current‑mode boost controller that provides a unique input‑current filtering capability, enabling reduced BOM cost and improved EMI performance.
Multiple NCV78964 devices can be combined in multiphase operation to further optimize booster filtering and support multi‑channel lighting modules. SPI programmability allows dynamic control of system parameters, enabling a single hardware platform to adapt across various vehicle lighting configurations. The drivers support high switching frequencies (up to 2MHz in the buck stage), allowing smaller inductors, fast response, and superior stability. Additional features include stand‑alone/limp‑home mode, shunt‑less booster operation, programmable soft‑start, constant‑voltage buck mode, low EMC emission, and compliance with 48V battery systems. Developed to meet automotive safety demands, the NCV78964 is ASIL‑B compliant and AEC‑Q100 qualified, making it suitable for safety‑critical lighting applications.
Features
- Single-chip 2-phase booster and synchronous dual buck solution
- Stand-alone/limp home mode
- 2x LED strings up to 60V, high 1.6A current capability per output
- Switched mode synchronous bucks with average current regulation through the LEDs, programmable buck frequency
- Independent supply voltage for each buck channel
- Buck constant voltage mode available
- Booster shunt-less operation
- Built-in programmable booster soft-start
- Superior stability and response time
- Designed for a small booster output capacitor
- Low EMC emissions
- High (up to 2MHz) operating frequencies to reduce inductor size
- 4MHz SPI interface for dynamic control of system parameters
- 48V battery system compliant
- TSSOP38 EP and TSSOP38 TEP package options
- ASIL B compliant, AEC-Q100 qualified, and PPAP capable
- Lead-free, Halide-/BFR-free, and RoHS compliant
Applications
- High and low beams
- Turn indicators and DRLs
- Position or park lights
- Fog and static cornering
- Adaptive driving beams and pixel applications
Specifications
- 6V to 6.7V operating buck input voltage with limited maximum peak current
- 6.7V to 65V operating buck input voltage range
- 3V to 5.5V operating VCC voltage supply
- 3.1V to 5.5V operating VCC voltage supply range during memory programming
- 4.5V to 5.5V operating VDRV supply voltage range
- 1.6A maximum operating buck switch average output current
- 20mA maximum VCC current consumption
- Oscillator output frequency
- 14.8MHz to 17.2MHz trimmed
- 6MHz to 20MHz untrimmed
- 5°C/W typical junction to exposed pad thermal resistance
- Temperature ranges
- -40°C to +125°C ambient operating temperature range
- -40°C to +150°C parametric operating junction temperature range
- -40°C to +160°C functional operating junction temperature range
- -40°C to +85°C junction temperature range during memory programming
- Maximum ESD ratings on the component level
- ±2kV Human Body Model (HBM)
- ±500V Charge Device Model (CDM)
Block Diagram
