MIC2588/MIC2594 Micrel MIC2588/MIC2594 Single-Channel, Negative High-Voltage Hot Swap Power Controllers General Description Features The MIC2588 and the MIC2594 are single-channel, nega- MIC2588: tive-voltage hot swap controllers designed to address the Pin-for-pin functional equivalent to the need for safe insertion and removal of circuit boards into LT1640/LT1640A/LT4250 live high-voltage system backplanes, while using very few Provides safe insertion and removal from live 48V external components. The MIC2588 and the MIC2594 are (nominal) backplanes each available in an 8-pin SOIC package and work in con- Operates from 19V to 80V junction with an external N-Channel MOSFET for which the Electronic circuit breaker function gate drive is controlled to provide inrush current limiting and Built-in 400s nuisance-trip delay (t ) FLT output voltage slew-rate control. Overcurrent fault protection Regulated maximum output current into faults is also provided and includes a programmable overcurrent Programmable inrush current limiting threshold. During an output overload condition, a constant- Fast response to short circuit conditions (< 1s) current regulation loop is engaged to ensure that the system Programmable undervoltage and overvoltage lockouts power supply maintains regulation. If a fault condition exceeds (MIC2588-xBM) a built-in 400s nuisance-trip delay, the MIC2588 and the Programmable UVLO hysteresis (MIC2594-xBM) MIC2594 will latch the circuit breakers output off and will Fault reporting: remain in the off state until reset by cycling either the UV/OFF Active-HIGH (-1BM) and Active-LOW (-2BM) pin or the power to the IC. A master Power-Good signal is Power-Good output signal provided to indicate that the output voltage of the soft-start Applications circuit is within its valid output range. This signal can be used Central ofce switching to enable one or more DC-DC converter modules. 48V power distribution All support documentation can be found on Micrels web site Distributed power systems at www.micrel.com. Server Networks Typical Application -48V RTN (Long Pin) -48V RTN DC-DC CONVERTER +2.5V 1 8 OUT /PWRGD VDD IN+ OUT+ C5 C4 *D1 ON/OFF 100uF 0.1uF SMAT70A 2 7 OV DRAIN IN- OUT- 100V R1 R2 +2.5V RTN MIC2588-2BM 698k 11.8k 1% 1% -48V RTN 3 6 UV GATE (Short Pin) 4 5 R3 VEE SENSE C FDBK 12.4k R FDBK 6.8nF *C2 1% 15k 100V 22nF C1 1uF R4 VDD *C6 10 0.33uF C3 0.22uF -48V IN (Long Pin) -48V OUT R SENSE M1 0.01 SUM110N10-09 5% Nominal Undervoltage and Overvoltage Thresholds: VUV = 36.5V V = 71.2V OV * Optional components (See Applications Information for more details) An external pull-up resistor for the power-good signal is necessary for DC-DC supplies (and all other load modules) not equipped with internal pull-up impedence Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC2588/MIC2594 Micrel Ordering Information Part Number Package Circuit Breaker PWRGD Polarity Lockout Functions Function Standard Pb-Free MIC2588-1BM MIC2588-1YM Active-High Undervoltage and Latched Off 8-pin SOIC Overvoltage MIC2588-2BM MIC2588-2YM Active-Low Undervoltage and Latched Off 8-pin SOIC Overvoltage MIC2594-1BM MIC2594-1YM Active-High Programmable UVLO Latched Off 8-pin SOIC Hysteresis MIC2594-2BM MIC2594-2YM Active-Low Programmable UVLO Latched Off 8-pin SOIC Hysteresis Pin Conguration PWRGD 1 8 VDD /PWRGD 1 8 VDD OV 2 7 DRAIN OV 2 7 DRAIN UV 3 6 GATE UV 3 6 GATE VEE 4 5 SENSE VEE 4 5 SENSE 8-Pin SOIC (M) 8-Pin SOIC (M) MIC2588-1BM MIC2588-2BM PWRGD 1 8 VDD /PWRGD 1 8 VDD ON 2 7 DRAIN ON 2 7 DRAIN OFF 3 6 GATE OFF 3 6 GATE VEE 4 5 SENSE VEE 4 5 SENSE 8-Pin SOIC (M) 8-Pin SOIC (M) MIC2594-1BM MIC2594-2BM M9999-083005 2 September 2005