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MIC2589-2BM Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC2589-2BM Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 17 page March 2004 1 M9999-031504 MIC2589/2595 Micrel MIC2589/MIC2595 Single-Channel, Negative High-Voltage Hot Swap Power Controllers/Sequencers General Description The MIC2589 and MIC2595 are single-channel, negative- voltage hot swap controllers designed to address the need for safe insertion and removal of circuit boards into “live” system backplanes, while using few external components. The MIC2589/89R and the MIC2595/95R are each available in 14-pin SOIC packaging and work in conjunction with an external N-Channel MOSFET for which the gate drive is controlled to provide inrush current limiting and output volt- age slew-rate control. Overcurrent fault protection is also provided for which the overcurrent threshold and the overcurrent duration are programmable. Very fast fault re- sponse is provided to ensure that system power supplies maintain regulation even during output short circuits. This family offers two responses to a circuit breaker fault condition: the MIC2589 and MIC2595 latch the circuit breaker’s output off if the overcurrent threshold interval is exceeded while the MIC2589R and MIC2595R automatically attempt to restart at a fixed duty cycle after a current limit fault. A primary Power-Good signal and two secondary (delayed and stag- gered) Power-Good signals are provided to indicate that the output voltage of the inrush current limiter is within its valid operating range. These signals can be used to perform an all- at-once or a sequenced enabling of one or more DC-DC power modules. All support documentation can be found on Micrel’s web site at www.micrel.com. Typical Application VDD VEE SENSE GATE DRAIN CFILTER UV OV 10 9 7 4 3 14 11 5 MIC2589-1BM MIC2589R-1BM CNLD 6 PWRGD1 1 PWRGD2 12 PWRGD3 13 PGTIMER 2 CGATE M1 R4 0 Ω CPG CFILTER CNLD –48V INPUT (Long Pin) –48V RETURN (Short Pin) –48V RETURN (Long Pin) RSENSE DC-DC Converter 100 µF /ON/OFF IN+ +3.3V +3.3V RETURN IN– OUT GND DC-DC Converter 100 µF /ON/OFF IN+ +5V +5V RETURN IN– OUT GND DC-DC Converter 100 µF /ON/OFF IN+ +2.5V +2.5V RETURN IN– OUT GND R3 12.4k Ω 1% Input Overvoltage = 71.2V Input Undervoltage = 36.5V (See "Functional Description"ˇ for more detail) R2 11.8k Ω 1% R1 698k Ω 1% Features • Provides safe insertion and removal from live –48V (nominal) backplanes • Operates from –19V to –80V • Fast responding circuit breaker (<1 µs) to short circuit conditions • User-programmable overcurrent detector response time • Electronic circuit breaker function: Output latch OFF (MIC2589/95) or Output auto-retry (MIC2589R/95R) • Active current regulation precisely controls inrush currents • Regulated maximum output currents into faults • Programmable undervoltage and overvoltage lockouts (MIC2589/89R) • Programmable UVLO hysteresis (MIC2595/95R) • Staggered ‘Power-Good’ outputs provide load sequencing • Fault reporting: Active-HIGH (MIC25XX-1) and Active-LOW (MIC25XX-2) Power-Good signal output Applications • Central office switching •–48V power distribution • Distributed power systems Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com |
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