Ericsson BMR456 series

Quarter Brick Advanced Bus Converter

The BMR456 power modules feature unprecedented output characteristics including tight regulation, a wide output range ready to power dynamic bus architectures, high efficiency flat curve from low-load to high-load and built-in Ericsson DC/DC Energy Optimizer.

Key Features

This series builds on new technology and adds benefits such as an optional communication interface (PMBus). Available with optional baseplate.

Input: 36-75 V, 40-60V
Output:  Adjustable Vout range 4 – 13.2 V
Output Power: up to 39 A / 468 W

  • Advanced Bus Converter Industry-standard Quarter-brick with digital PMBus Interface
  • PMBus Revision 1.2 compliant
  • Optional industry standard 5-pins for intermediate bus architectures
  • Industry-leading Power Density for Telco and ICT … 126-140A / sq. in
  • Ericsson DC/DC Energy Optimizer built-in
  • High efficiency, typ. 96.4% at half load, 12 Vout
  • Fully regulated Advanced Bus Converter from 36-75 V
  • +/- 2% output voltage tolerance band over entire Vin range 36-75V
  • Fast Feed forward regulation to manage line transients
  • Low Profile with max height 11.3 mm (0.445 in)
  • Optional Baseplate for high temperature applications
  • Droop Load Sharing for 10% tolerance over entire Vin range36 - 75V
  • High capacitive load solution available
  • 2250Vdc input to output isolation
  • 2.9 Million hours MTBF


Product Program

36-75 V Input:

Vout (V)Iout (A)Pout (W)Part No 
935315BMR456 0004/004 
1235420BMR456 0004/001 
1235420BMR456 0004/018High Capacitive Load
up to 15mF
1235400BMR456 0007/013Droop Load Sharing
12.4535415BMR456 0007/014Droop Load Sharing


36/40-60 V Input:

Vout (V)Iout (A)Pout (W)Part No 
939351BMR456 0000/003 
1239468BMR456 0000/002 
1239445BMR456 0011/016Droop Load Sharing
12.4539462BMR456 0011/017Droop Load Sharing


Mechanical Data

Size (LxWxH):

57.9 x 36.8 x 11.3 mm (2.28 x 1.45 x 0.445 in)


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Technical Documentation

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