LTC4231 Micropower Hot Swap Controller Fea T Descrip T n Enables Safe Board Insertion and Removal from a The LTC 4231 is a micropower Hot Swap controller that Power Supply allows safe circuit board insertion and removal from a live n 4A Supply Current power supply. An internal high side switch driver controls n 0.3A Shutdown Current the gate of an external N-channel MOSFET. Back-to-back n Wide Operating Voltage Range: 2.7V to 36V MOSFETs can be used for reverse supply protection down n Reverse Supply Protection to 40V to 40V. n Adjustable Analog Current Limit with Circuit Breaker The LTC4231 provides a debounce delay and allows the n Automatic Retry or Latchoff on Current Fault GATE to be ramped up at an adjustable rate. After start- n Overvoltage and Undervoltage Monitoring up, the LTC4231 s quiescent current drops to 4A during n Controls Single or Back-to-Back N-Channel MOSFETs normal operation with output active. UVL, UVH, OV and n 12-Lead MSOP and 3mm 3mm QFN Packages GNDSW monitor overvoltage and undervoltage periodi- cally, keeping total quiescent current low. Pulling SHDN low shuts down the LTC4231 and quiescent current drops a T to 0.3A. n Battery Powered Equipment During an overcurrent fault, the LTC4231 actively limits n Solar Powered Systems current while running an adjustable timer. The LTC4231-1 n Portable Instruments remains off after a current fault while the LTC4231-2 n Automotive Battery Protection automatically reapplies power after a cool-down period. n Energy Harvesting L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap and PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical a T Battery Hot Swap with Reverse Protection Power-Up Waveforms SMAJ24CA V 22.5m OUT Si7164DP Si5410DU 24V CONTACT IN 2A BOUNCE 20V/DIV 220F SENSE GATE GATE 1020k 20k 20V/DIV IN SOURCE UVL STATUS 24V SOURCE 1.65k LTC4231 20V/DIV UVH I LOAD 4.22k 5A/DIV OV SHDN 4231 TA01b 10ms/DIV 32.4k GNDSW TIMER GND 180nF 4231 TA01a 4321fa 1 For more information www.linear.com/LTC4231 ion pplica ions pplica ion uresLTC4231 a T e Maxi Mu M r a T (Notes 1, 2) Supply Voltage GATESENSE .......................................... 40V to 20V IN ............................................................ 40V to 40V STATUS ................................................. 0.3V to 40V Input Voltages TIMER ...................................................... 0.3V to 4V SENSE, SOURCE ..................................... 40V to 40V Operating Ambient Temperature Range INSENSE ............................................... 40V to 40V LTC4231C ................................................ 0C to 70C SHDN, UVL, UVH, OV, GNDSW .............. 0.3V to 40V LTC4231I..............................................40C to 85C Input Currents LTC4231H .......................................... 40C to 125C SHDN, UVL, UVH, OV, GNDSW (Note 3) ............1mA Storage Temperature Range .................. 65C to 150C Output Voltages Lead Temperature (Soldering, 10 sec) GATESOURCE (Note 4) .........................0.3V to 13V MSOP Package .................................................300C p c F T TOP VIEW TOP VIEW 12 11 10 SENSE 1 12 GATE SHDN 1 9 SOURCE IN 2 11 SOURCE UVL 13 2 8 TIMER 3 SHDN 10 TIMER 4 9 STATUS UVL UVH 3 7 STATUS UVH 5 8 GND OV 6 7 GNDSW 4 5 6 MS PACKAGE 12-LEAD PLASTIC MSOP T = 150C, = 135C/W JMAX JA UD PACKAGE 12-LEAD (3mm 3mm) PLASTIC QFN T = 150C, = 68C/W JMAX JA EXPOSED PAD (PIN 13) PCB CONNECTION TO GND IS OPTIONAL o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4231CUD-1 PBF LTC4231CUD-1 TRPBF LGMX 12-Lead (3mm 3mm) Plastic QFN 0C to 70C LTC4231CUD-2 PBF LTC4231CUD-2 TRPBF LGSP 12-Lead (3mm 3mm) Plastic QFN 0C to 70C LTC4231IUD-1 PBF LTC4231IUD-1 TRPBF LGMX 12-Lead (3mm 3mm) Plastic QFN 40C to 85C LTC4231IUD-2 PBF LTC4231IUD-2 TRPBF LGSP 12-Lead (3mm 3mm) Plastic QFN 40C to 85C LTC4231HUD-1 PBF LTC4231HUD-1 TRPBF LGMX 12-Lead (3mm 3mm) Plastic QFN 40C to 125C LTC4231HUD-2 PBF LTC4231HUD-2 TRPBF LGSP 12-Lead (3mm 3mm) Plastic QFN 40C to 125C 4321fa 2 For more information www.linear.com/LTC4231 OV IN GNDSW SENSE GND GATE ion or er ion igura on in ings bsolu