DATASHEET ISL6173 FN9186 Rev 3.00 Dual Low Voltage Hot Swap Controller January 3, 2006 This IC targets dual voltage hot swap applications across the Features +2.5V to +3.3V (nominal) bias supply voltage range with a Fast Current Regulation amplifier quickly responds to second lower voltage rail down to less than 1V. It features a overcurrent fault conditions charge pump for driving external N-Channel MOSFETs, regulated current protection and duration, output undervoltage Less than 1s response Time to Dead Short monitoring and reporting, optional latch-off or retry response, Programmable Current Regulation Level and Duration and adjustable soft-start. Two Levels of Overcurrent Detection Provide Fast The current regulation level (CR) for each rail is set by two Response to Varying Fault Conditions external resistors and each CR duration is set by an external Overcurrent Circuit Breaker and Fault Isolation functions capacitor on the TIM pin. After the CR duration has expired Adjustable Current Regulation Threshold as low as 20mV the IC then quickly pulls down the associated GATE(s) output turning off its external FET(s). The ISL6173 offers a Selectable Latch-off or Auto Retry Response to Fault latched output or indefinite auto retry mode of operation. conditions Adjustable voltage ramp-up for In-rush Protection During Ordering Information Turn-On TEMP. Rail Independent Control, Monitoring and Reporting I/O PART NUMBER PART RANGE PACKAGE PKG. (Note) MARKING (C) (Pb-Free) DWG. Dual Supply Hot Swap Power Distribution Control to <1V ISL6173DRZA ISL6173DRZ 0 to +85 28 Ld 5x5 QFN L28.5x5 Charge Pump Allows the use of N-Channel MOSFETs ISL6173DRZA-T ISL6173DRZ 0 to +85 28 Ld 5x5 QFN L28.5x5 QFN Package: Tape & Reel - Compliant to JEDEC PUB95 MO-220 ISL6173EVAL3 Evaluation Platform QFN - Quad Flat No Leads - Package Outline - Near Chip Scale Package footprint, which improves NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets molding compounds/die attach materials and 100% PCB efficiency and has a thinner profile matte tin plate termination finish, which are RoHS compliant and Pb-Free Plus Anneal Available (RoHS Compliant) compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow Applications temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Power Supply Sequencing, Distribution and Control Hot Swap/Electronic Breaker Circuits Pinout ISL6173 (28 LD QFN) TOP VIEW V1(in) Rsns1 V1(out) 28 27 26 25 24 23 22 SNS1 1 21 SNS2 VS1 SNS1 GT1 VO1 EN1 EN2 UV1 VO1 2 20 VO2 RTR/LTCH PG1 BIAS SS1 3 19 SS2 CPQ+ FLT1 SS1 GT1 4 18 GT2 CPQ- OCREF ISL6173 CPVDD SS2 FLT1 5 17 FLT2 FLT2 PG2 PGND PG1 6 16 PG2 GND UV2 CT1 CT2 VS2 SNS2 GT2 VO2 CT1 7 15 CT2 8 9 10 11 12 13 14 V2(OUT) V2(in) Rsns2 FIGURE 1. TYPICAL APPLICATION FN9186 Rev 3.00 Page 1 of 20 January 3, 2006 RTR/LTCH VS1 GND UV1 PGND EN1 CPQ- OCREF BIAS EN2 CPQ+ UV2 CPVDD VS2 Rset2 Rset1ISL6173 Block Diagram Io LOAD Vin Vo Rsns Q Iset Rset Current 10V Limit 24A Amplifier Soft Start Amplifier - CPVDD - + 10A 42A SS1 + 3K Css - + WOC FLT1 Comparator OC Timer 1.178V + & Logic Iref CPVDD - OC OCREF Iref Current Comparator 10A 4 PG1 Mirror Rref CT1 BIAS + 10K Ct EN1 - 1.178V Timeout Rs1 Comparator BIAS - 633mV 10K UV1 RTR/LTCH UV + Comparator BIAS Rs2 CPQ+ 10V(out) X2 X2 Cp Charge Charge Pump Pump CPQ- CPVDD Cv 633mV POR and Bandgap 1.178V ISL6173 FIGURE 2. ISL6173 - INTERNAL BLOCK-DIAGRAM OF THE IC - CHANNEL ONE ONLY FN9186 Rev 3.00 Page 2 of 20 January 3, 2006 PGND GND VS1 SNS1 GT1 VO1