Calex – Compact 3000W Bi-Directional DC/DC for Micro Hybrid Automotive Applications

The 3,000 Watt 48S12.3K0BCA Bidirectional non-isolated DC/DC converter provides a complete solution for in-vehicle power distribution in 12V/48V battery configurations for a variety of applications including micro and mild hybrid automotive systems. The bidirectional DC/DC converter charges a low side (12V) battery during normal operation (buck mode) and charges or assists the high voltage (48V) battery in emergency situations (boost mode). The bidirectional DC/DC converter operates more as an ideal current source with variable direction, thus allowing energy transfer between two voltage domains. Voltage feedback maintains output voltage within the acceptable operating range and eventually allows a custom charging profile for the battery pack. It regulates the average current flowing between the high voltage and low voltage ports in the direction selected via CAN interface. It is packaged in an unprecedented low profile 8.67” x 6.14” x 1.008” mechanically enclosed package weighing only 2.86 lbs. The package makes the unit ideal for harsh shock and vibration requirements as well as easy integration with a battery pack. Three M8 bushings are provided two for power connection and two for ground connections.


  • Automotive 12V/48V Battery System
  • Buck, boost and precharge modes of operation
  • Low Side (LS): 12V Input Voltage Range: 6V to 18V
  • High Side (HS): 48V Input Voltage Range: 24V to 58V
  • Overcurrent, Overvoltage, & Over-temperature Protection. All protections are latching.
  • Disconnect switch on LS (12V) and HS (48V)
  • Reverse polarity protection
  • Constant Voltage and Constant Current Mode
  • Average Current Mode Control
  • Custom Charging Profile for the Battery Pack
  • LS Current and internal temperature Monitoring
  • High power density
  • Low profile 1”
  • Efficiency up to 96.5%
  • Dimensions 8.67” x 6.14” x 1.008”
  • Weight 3.04 lb (1.38 Kg)
  • Excellent thermal performance
  • Constant switching frequency
  • CAN 2.0b Interface including remote ON/OFF
  • Good shock and vibration damping
  • Highly Integrated Solution Using Automotive Qualified Components
  • RoHS Compliant

The 48S12.3K0BCA converter is backed by Calex’s Five Year Warranty.