MIC2582/MIC2583 Single-Channel Hot Swap Controllers General Description Features The MIC2582 and MIC2583 are single-channel positive MIC2582: Pin-for-pin functional equivalent to the voltage hot swap controllers designed to allow the safe LTC1422 insertion of boards into live system backplanes. The 2.3V to 13.2V supply voltage operation MIC2582 and MIC2583 are available in 8-pin SOIC and Surge voltage protection up to 20V 16-pin QSOP packages, respectively. Using a few external Current regulation limits inrush current regardless of components and by controlling the gate drive of an load capacitance external N-Channel MOSFET device, the MIC2582/83 provide inrush current limiting and output voltage slew rate Programmable inrush current limiting control in harsh, critical power supply environments. Electronic circuit breaker Additionally, a circuit breaker function will latch the output Optional dual-level overcurrent threshold detects MOSFET off if the current-limit threshold is exceeded for a excessive load faults determined period. The MIC2583R option includes an Fast response to short-circuit conditions (<1s) auto-restart function upon detecting an over current Programmable output under-voltage detection condition. Undervoltage Lockout (UVLO) protection Datasheets and support documentation are available on Auto-restart function (MIC2583R) Micrels web site at: www.micrel.com. Power-on-Reset (POR) status output Power good (PG) status output (MIC2583 and MIC2583R) /FAULT status output (MIC2583 and MIC2583R) Applications RAID systems Base stations PC board hot swap insertion and removal +12V backplanes Network switches Typical Application Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC2582/MIC5283 Ordering Information Part Number Fast Circuit Breaker Threshold Circuit Breaker Package x = J, 100mV MIC2582-xYM Latched off 8-pin SOIC x = J1, Off x = M, Off x = J, 100mV (1) x = K , 150mV MIC2583-xYQS Latched off 16-pin QSOP (1) x = L , 200mV (1) x = M , Off x = J, 100mV (1) x = K , 150mV MIC2583R-xYQS Auto-retry 16-pin QSOP (1) x = L , 200mV (1) x = M , Off Note: 1. Contact factory for availability. Pin Configuration 8-Pin SOIC (M) 16-Pin QSOP (QS) Pin Description Pin Number Pin Number Pin Name Pin Function 8-Pin SOIC 16-Pin QSOP Power-on-Reset output: Open drain N-channel device, active low. This pin remains asserted during start-up until a time period (t ) after the FB pin POR voltage rises above the power good threshold (VFB). The timing capacitor C POR 1 1 /POR determines t . When the output voltage monitored at the FB pin falls below POR V , /POR is asserted for a minimum of one timing cycle (t ). The /POR pin FB POR requires a pull-up resistor (10k minimum) to VCC. ON input: Active high. The ON pin is an input to a Schmitt-triggered comparator used to enable/disable the controller, is compared to a 1.24V reference with 50mV of hysteresis. When a logic high is applied to the ON pin (V > 1.24V), a ON start-up sequence begins and the GATE pin starts ramping up towards its final 2 3 ON operating voltage. When the ON pin receives a logic low signal (V < 1.19V), ON the GATE pin is grounded and /FAULT remains high if VCC is above the UVLO threshold. ON must be low for at least 20s after VCC is above the UVLO threshold in order to initiate a start-up sequence. Additionally, toggling the ON pin LOW to HIGH resets the circuit breaker. Revision 5.0 May 23, 2014 2