LTC4226 Wide Operating Range Dual Hot Swap Controller Fea T Descrip T n Allows Safe Board Insertion into Live Backplane The LTC 4226 dual Hot Swap controller allows two n Selectable Current Limit and Dual-Rate Timer power paths to be safely inserted and removed from a Accommodate Load Surges live backplane or powered connector. Using N-channel n Fast Response Limits Peak Fault Current pass transistors, supply voltages ranging from 4.5V to n Wide Operating Voltage Range: 4.5V to 44V 44V are ramped up at an adjustable rate. n Optional Auto-Retry or Latchoff after Three selectable ratios of current limit to circuit breaker Overcurrent Fault threshold accommodate noisy loads and momentary high n High Side Drive for External N-Channel MOSFET peak currents without interruption, while a dual-rate fault n Allows Parallel Power Paths for High Current timer protects the MOSFET from extended output over- Applications current events. FAULT outputs indicate the circuit breaker n Available in 16-Pin QFN (3mm 3mm) and MSOP status. The LTC4226-1 remains off after a fault while the Packages LTC4226-2 automatically retries after a 0.5s delay. The LTC4226 can also be configured as a bidirectional cur- a T rent limiter/circuit breaker. For high current applications, n Apple FireWire/IEEE 1394 two channels may be configured as parallel power paths. n Disk Drives L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of n Rugged 12V, 24V Applications their respective owners. n Hot Board/Connector Insertion n Uni/Bidirectional Current Limiter/Circuit Breaker Typical a T 2 Port FireWire Application PORT 1 1394 1394 SS3P5 SOCKET PLUG 30m FDMS86500DC Inrush after Load Connection 7V TO 33V V CC 10V/DIV V SENSE1 GATE1 OUT1 CC1 CABLE INSERTION ON1 FTMR1 V 220nF FAULT1 OUT CURRENT 10V/DIV LIMIT CLS LTC4226-2 GND SELECT FAULT2 220nF ON2 FTMR2 INRUSH I OUT V SENSE2 GATE2 OUT2 PORT 2 CC2 CURRENT 1A/DIV 1394 1394 SOCKET PLUG 4226 TA01b FDMS86500DC 1ms/DIV 30m SMCJ33A* V = 12V CC C = 1mF LOAD 4226 TA01a *36.7V TO 40.6V BV 4226f 1 ion pplica ions pplica ion uresLTC4226 a T e Maxi Mu M r a T (Notes 1, 2) V ........................................................... 0.3V to 55V Operating Ambient Temperature Range CCn SENSEn, ONn, FAULTn, CLS ....................... 0.3V to 55V LTC4226C ................................................ 0C to 70C GATEn (Note 3) .......................................... 0.3V to 68V LTC4226I .............................................40C to 85C OUTn (Note 3) ............................................ 0.3V to 55V Storage Temperature Range .................. 65C to 150C GATEn OUTn (Note 3) ............................. 0.3V to 18V MSOP Lead Temperature (Soldering, 10 sec) ........300C FTMRn ......................................................... 0.3V to 4V p c F T TOP VIEW TOP VIEW 16 15 14 13 FAULT1 1 16 FAULT2 V 1 12 V CC1 CC2 ON1 2 15 ON2 V 3 14 V SENSE1 2 11 SENSE2 CC1 CC2 SENSE1 4 13 SENSE2 17 GATE1 GATE2 3 10 GATE1 5 12 GATE2 OUT1 6 11 OUT2 OUT1 4 9 OUT2 FTMR1 7 10 FTMR2 GND 8 9 CLS 5 6 7 8 MS PACKAGE 16-LEAD PLASTIC MSOP T = 125C, = 120C/W JMAX JA UD PACKAGE 16-LEAD (3mm 3mm) PLASTIC QFN T = 125C, = 68C/W JMAX JA EXPOSED PAD (PIN 17), PCB GND CONNECTION OPTIONAL o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4226CUD-1 PBF LTC4226CUD-1 TRPBF LFRC 16-Lead (3mm 3mm) Plastic QFN 0C to 70C LTC4226CUD-2 PBF LTC4226CUD-2 TRPBF LFRD 0C to 70C 16-Lead (3mm 3mm) Plastic QFN LTC4226IUD-1 PBF LTC4226IUD-1 TRPBF LFRC 16-Lead (3mm 3mm) Plastic QFN 40C to 85C LTC4226IUD-2 PBF LTC4226IUD-2 TRPBF LFRD 16-Lead (3mm 3mm) Plastic QFN 40C to 85C LTC4226CMS-1 PBF LTC4226CMS-1 TRPBF 42261 16-Lead Plastic MSOP 0C to 70C LTC4226CMS-2 PBF LTC4226CMS-2 TRPBF 42262 16-Lead Plastic MSOP 0C to 70C LTC4226IMS-1 PBF LTC4226IMS-1 TRPBF 42261 16-Lead Plastic MSOP 40C to 85C LTC4226IMS-2 PBF LTC4226IMS-2 TRPBF 42262 16-Lead Plastic MSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: