Power Management I Product News
Ericsson’s digital DC/DC converter goes surface mount
Based on the ground breaking BMR453 DC/DC converter, Ericsson Power Modules’ new BMR453 SI version adds the company’s Floating Inserted Pins (FIP) technology to offer a surface mount version that will enable higher density boards to be designed and used. The digitally controlled, PMBus compliant BMR453 DC/DC converter, introduced in June 2009, enabled system designers to optimise the energy delivered to core processors or to a single sub-function at a very low board-level. Because board density is increasing, and to simplify manufacturing processes, board designers are requiring power modules suppliers to offer surface mount alternatives to conventional through-hole versions. This is a real challenge when considering high power modules and even more of a challenge when such modules require additional I/O = hence the development of the mechanical FIP concept.
Ericsson Power Modules’ FIP concept is based on highly accurately tooled pins that are inserted and aligned during the original assembly process. When a BMR453-SI module is assembled on the final board, during reflow the pins remain aligned in the plated through- hole of the converter, and self-adjust to guarantee perfect interconnection between the two solder pads. The pins are also manufactured with very tight tolerances, guaranteeing co-planarity and mechanical accuracy. This process ensures high reliability and host equipment availability. In addition to input and output power connections, additional I/O (+ and – output remote sense, address pin, PMBus clock and data, power good and user configurable I/O, PMBus ground, PMBus alert signal and PMBus remote control or current sharing) are made
available through a micro-interface. This connector has been designed to comply with Ericsson FIP technology and to guarantee full alignment and co-planarity during the different soldering processes.
“A customers’ design cycle when using a new board mounted power module in the ICT industry - especially when introducing such high level of features - is about two years, and our customers are now moving to volume manufacturing and requiring access to conventional and surface mountable version of our BMR453” said Patrick Le Fèvre, Marketing and Communication Director of Ericsson Power Modules. “The addition of a surface mountable version reflects the huge market interest for such products and also the technology that will contribute to reduce energy consumption.”
Based on a digital control loop and including a PMBus interface, the BMR453 SI is the first surface mount isolated DC/DC converter to make it possible for system architects to precisely monitor, control and
adjust parameters in real time. Through a board power manager or a PMBus interface embedded into the board controller, system architects can precisely adjust the intermediate bus voltage to suit load conditions but also to read back data from the BMR453 giving information about load, temperature, voltage and other parameters indicating boards’ status, making it possible to pro-actively decide what action to take. As well, the built-in digital control loop self-optimises switching dead time, guaranteeing that DC/DC power consumption remains the lowest whatever the load condition is, resulting in high efficiency from low load to full load condition. With 96% efficiency, the BMR453 SI offers up to 396W output power or up to 33A with ±2% accuracy. Showing versatility, the BMR453 has an input voltage range of 36V to 75V, and its output voltage is variable from 8.1V to 13.2V. With a maximum height of 11.5mm, the BMR453 SI is compatible with reduced board-space applications or cold-wall equipments requiring low height. BMR453 SI’s micro controller sweeps up a large quantity of discrete control and overhead components resulting in better integration, lower component count, less PCB area, and improved reliability. The net result for the customer is gains in virtually all areas; increased power density, greater accuracy, a much higher level of control and integration within a system, and reduced through life cost of ownership as a result of its high efficiency and intelligent use of energy management. Prime customers using such products are from the Information and Telecommunication Technology such as datacenters, routers, telecom equipment and a large range of applications where system designers are considering ways to reduce energy consumption by using an optimised energy solution.
Ericsson Power Modules |
www.ericsson.com/powermodules
New LDOs achieve 2% accuracy over industrial temperatures
A pair of low dropout linear regulators with industrial temperature rating of -40°C to 85°C have been introduced by Diodes Incorporated. Suitable for applications including set-top boxes, routers and LCD monitors, the 300mA, 150mV dropout AP7335 and 600mA, 300mV dropout AP7365 offer adjustable and fixed output voltage operation at an accuracy of 2% across the temperature range. Input voltage is wide, at 2V to 6V, and both LDOs are capable of delivering an adjustable output voltage between 0.8V and 5.0V and fixed voltages of 0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 2.0V, 2.5V, 2.8V, 3.0V, 3.3V and 3.9V. Their very low quiescent current of just 35µA means the devices offer power saving benefits in low power and battery operated products. The regulators' ability to drive low ESR 1µF MLCC output capacitors helps improve stability and reduce circuit cost, while a high PSRR rating of 65db at 1kHz ensures low noise high quality supplies for audio and RF applications. LDO robustness is assured by integral over-current, over-temperature and short-circuit protection.
Diodes Incorporated |
www.diodes.com
26 July/August 2010
Components in Electronics
www.cieonline.co.uk
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