A dual channel hot swap power controller providing flexible power sequencing capabilities is available from Micrel Semiconductor.
Available in 16-pin and 24-pin TSSOP packages respectively, the MIC2584 and MIC2585 offer the design engineer a very flexible means of controlling the sequencing of power supply voltages to the various ICs in their system, says the company. This flexibility allows these devices to meet a variety of power sequencing requirements across several platforms. Most importantly, says Micrel, the devices offer true tracking of each supply relative to the other without the need for external clamping diodes and without regard to load capacitance. The MIC2584's default output voltage mode is tracking whereas the MIC2585 can be configured for output voltage tracking- or staggered-mode operation.
In addition to providing system protection against overcurrent fault conditions, the MIC2585 also monitors each output for overvoltage and undervoltage events. Both devices also control inrush current during PCB insertion, which preserves system voltage regulation requirements. A single-pin enable controls both channels and permits the orderly removal of external power FET drive upon PCB removal. The devices operate from system supply voltages from 1,0 to 13,2 V with input surge protection up to 20 V.
The MIC2584 and MIC2585 offer the designer a simple, yet flexible means to not only provide standard fault protection but also sequence power to complex ICs whose power sequencing requirements continue to evolve. In large distributed power systems, the MIC2585 can be easily cascaded to support any number of power supplies.
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