60A digital point-of-load DC/DC converter delivers power density
Ericsson has announced the launch of a 60A 3E* digital point-of-load (POL) DC/DC power module, the BMR466, designed to power MPUs, FPGAs, ASICs and other digital ICs on complex boards. Up to eight of the fully regulated 60A (maximum) POL converters can be connected in parallel to deliver up to 480A in multi-module and multi-phase systems.
This produces an economical, efficient and scalable power solution with a small footprint, high stability, advanced loop compensation and class-leading thermal characteristics. The LGA-packaged BMR466 brings exceptional design flexibility to reliable, high-current, low voltage power systems.
Suited for deployment in distributed power and intermediate bus voltage architectures within the ICT, telecoms and industrial sectors, the module targets high-power and high-performance use in products such as networking and telecommunications equipment, servers and data storage applications, as well as industrial equipment.
The BMR466 LGA footprint is 25.0x14.0mm and it has an exceptionally low profile of 7.0mm, which facilitates compact system design. Spreading the placement of the 60A units across printed circuit boards means that heat dissipation can be distributed, optimising the use of multi-layer board technology and simplifying cooling arrangements. In addition, the use of a surface-mount LGA package with symmetric contact layout offers superior mechanical contact and high reliability after soldering. The elimination of connecting leads results in lower inductance, enabling excellent noise and EMI characteristics. This is further enhanced because a high number of the LGA contacts are ground pins.
Through software control, the BMR466 uses class-leading adaptive compensation of the PWM control loop and advanced energy-optimisation algorithms to reduce energy consumption and deliver a stable and secure power supply with fast transient performance over a wide range of operating conditions. In multi-module systems, two or more of the single-phase BMR466 POL converters can be synchronized with an external clock to enable phase spreading, which means the reduction of input ripple current and corresponding capacitance requirements and efficiency losses.
The ripple current can be estimated using the Ericsson Power Designer (EPD) software tool, which enables easy capacitor selection. The BMR466 is also fully compliant with PMBus commands and has been integrated into the EPD software, which makes it easy for power system architects to simulate and configure complete multi-module and multi-phase systems prior to implementation. This cuts time-to-market.
Operating from a 4.5 to 14V input, the BMR466 is suited to operation across a range of intermediate bus voltages and complies with the Dynamic Bus Voltage scheme to reduce power dissipation and save energy. The factory default output voltage is set to 1.2V, but can be adjusted from 0.6 to 1.8V either via a pin-strap resistor or PMBus commands. The BMR465 powertrain guarantees high efficiency and reliability and is built from the latest generation of power transistor semiconductors, enabling the module to deliver up to 94.9% with a 5V input and a 1.8V output, at half load.
Other device features include an MTBF of 50 million hours (based on Telcordia SR-332 Issue 3, Method 1.) and protection features include input-under-voltage shutdown, over-temperature protection, output-short-circuit and over-voltage protection, and remote control and Power Good.
“The BMR466 deploys a combination of best-in-class power density design, advanced power transistor technologies, automatic compensation techniques and excellent thermal performance characteristic with all the advantages of digital control to deliver out-of-the-box stable and secure performance,” said Martin Hägerdal, President, Ericsson Power Modules. “As well as significant competitive advantages, the 60A POL module also offers time-to-market benefits and only half of the size saving premium board space.”
The BMR466 has been designed and manufactured by Ericsson to meet the highest standards available for DC/DC power converters in the industry, delivering the levels of quality and confidence that are required by power system designers to develop long-term and high-performance platforms.