Quad power supply sequencer and supervisor

12 July 2006 Power Electronics / Power Management

Multiple supply systems often require turn-on and turn-off sequencing of supplies to protect vital circuits from damage and to allow for programmable logic boot-up and configuration. The LTC2928 quad supply sequencer and supervisor from Linear Technology offers the flexibility to configure the turn-on and turn-off sequence, monitor the supplies and diagnose supply failures. With a simple pin-configuration approach to sequencing, it requires no firmware and allows the four supplies to be placed in any combination of eight time positions with configurable delay between each. The comparator thresholds (sequence-up or -down) can be specific to each phase. The comparator outputs are encoded into four digital outputs that provide diagnostics for the type of fault (sequence, under-voltage, external controller or external fault) and the channel that failed. These timing, threshold and diagnostic options are configured with only a few external components. Setting the sequence, timing and thresholds often requires software-programming resources that are not always readily available. The LTC2928 allows the designer the freedom and flexibility to iterate without changing the layout or requesting software code changes.

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