Digital VRM Challenges Analog Systems
Using a highly-integrated digital PWM controller, the 100-W BMR450 voltage regulation module (VRM) from Ericsson Power has a component count up to 50% smaller for a higher power density (120 A/in2) than a similar analog product. Further performance advantages are realized using the device’s embedded dynamic and adaptive controls. Accepting an input from 4.5 to 14 V, the VRM has an output from 0.7 to 5 V at up to 20 A at an efficiency as high as 86.5% at half load. The 1.01 x 0.51 x 0.32-in. device can be controlled and monitored via PMBus for aspects such as load current, load status, and temperature.
Ericsson Power Modules