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ST expands VR platform

Posted: 25 Oct 2005 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? st? vr? voltage regulator? l6713?

ST's new PWM controller

STMicroelectronics (ST) expanded its VR (Voltage Regulator) platform for desktop computer and server CPU power management applications with the introduction of the L6713 and L6714. According to the press release, these two devices provide state-of-the-art voltage-regulator control for the most advanced Intel and AMD processors and are fully compatible with both the 6-bit VID AMD specification and the VR11 Intel specification for next-generation CPUs.

The company added that the L6714 is the industry's first 4-phase motherboard PWM (pulse-width modulator) controller to incorporate embedded high-current MOSFET drivers, thereby reducing valuable board area and increasing system reliability compared to alternative approaches that require external MOSFET drivers. Meanwhile, the L6713 allows simple migration between 4-phase and 3-phase topologies without the need to change the pc-board layout when a 4-phase application is migrated to three phases. Migration is achieved by depopulating the board of the external components related to the 4th phase and replacing the L6714 with the pin-compatible L6713. This eliminates the cost and time delay involved in redesigning and re-qualifying the highly complex motherboard, said ST.

The company incorporated the PWM controller, MOSFET drivers and protection mechanisms in a single chip, providing one of the industry's best system-partitioning solution in terms of cost, PCB space, system reliability and product evolution options. Key technical features of the L6713 and L6714 include output accuracy of 0.5 percent over temperature and input voltage variations; flexible and accurate control via fully differential current sensing across either the external inductors or LS (low side) MOSFETs per phase; preliminary overvoltage protection that safeguards the CPU in the event of high side MOSFET failure during start-up; excellent thermal performance, thanks to the HTQFP64 package with exposed thermal pad; active current sharing with an accuracy of 3 percent between phases; fast dynamic response; differential voltage sensing; programmable offset; programmable overvoltage threshold; programmable oscillator frequency; programmable digital soft-start; SS_END/PGOOD signal; and system thermal monitoring.

The L6713 and L6714 are priced at $2 and $2.50, respectively, in quantities of 1,000 pieces.

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