RAIL SEQUENCING IN EP71XX INTEGRATED VOLTAGE REGULATORS Application Note
■Empower Semiconductor’s EP71xx series is a family of Step-Down Integrated voltage regulators (IVRs) available in single to quad-output configurations. The EP71xx IVRs offer capability to customize and program output voltage, soft-start times, and power up/down sequencing for each of the outputs independently. This application note will explain how to achieve the desired power up/down sequencing by programming the user-configurable registers, through various examples.
■The EP71xx Product Description and Datasheet provide more details on the ratings, electrical characteristics, operating characteristics, and functional features of the product family.
●Introduction
■Many complex systems in the industry use FPGAs, microprocessors, DSPs etc., all usually requiring different rail voltages to power the memory, core, auxiliary outputs, and input/outputs (I/Os). Furthermore, these require stringent power up and down sequencing of the rails.
■Power sequencing is the order of the startup and shutdown of the various rails within the system executed in a controlled manner with defined time intervals and dependencies between each rail. To prevent high inrush currents, prevent latch-ups, and to ensure reliable and correct operation, sequencing of the multiple rails is crucial and is an important aspect of the overall system design. Improper sequencing of the rails can cause incorrect operation or even damage the system. FPGA vendors such as Xilinx specify either a recommended or required power-up/down sequence in their datasheets. In addition, timing requirements such as soft-start ramp rates and delays are also listed in the datasheets. In most cases, the recommended power-down sequence is the reverse order of the power-up sequence but the EP71xx is flexible enough to accommodate any order needed.
■The EP71xx family features the ability to prototype the sequencing the multiple outputs through software and program the target sequence in the device through MTP (multi-time programmable) memory. This enables ‘default’ power-up sequencing in the production system, removing the need for a system micro-controller to control or program the sequence. More information about MTP option can be found in the product datasheet or the MTP programming app note.
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EP71xx series 、 EP71xx 、 EP7144 、 EP7112 、 EP7123 、 EP7124 、 EP7131 、 EP7136 、 EP7139 、 EP7143 |
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Step-Down Integrated voltage regulators 、 Step-Down IVRs 、 INTEGRATED VOLTAGE REGULATORS |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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February 9th, 2024 |
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Rev 1.1 |
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AN-EP71xx-1 |
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2.3 MB |
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