LTC4371 Dual Negative Voltage Ideal Diode-OR Controller and Monitor Fea T Descrip T n Controls N-Channel MOSFETs to Replace Power The LTC 4371 is a two-input negative voltage ideal diode-OR Schottky Diodes controller that drives external N-channel MOSFETs as a low n Low 15mV Forward Voltage Minimizes Dissipation dissipation alternative to Schottky diodes in high power 48V n Withstands > 300V Transients systems. Low power dissipation and voltage loss eliminates n Fast Turn-Off: <220ns the need for heatsinks and reduces PC board area. Power n Shunt Regulated for High Voltage Applications sources can be easily ORed together to increase total system n 4.5V Minimum Operation power and reliability. n Low 350A Quiescent Current The LTC4371 tolerates 300V transients such as those n 5mA Gate Pull-Up for 60Hz Applications experienced during lightning-induced surges and input n High Impedance Drain Pins: <10A Leakage supply short-circuit events. The internal shunt regulator n Open Fuse and MOSFET Monitor and low 350A quiescent current allow the use of a large n 10-Pin (3mm 3mm) DFN and MSOP Packages value dropping resistor to protect the supply pin against high voltage transients, while the high impedance drain pins can be similarly protected by high value series resis- a T tors without compromising diode operation. n 48V Telecom Power The 220ns reverse current turn-off is achieved by a powerful n AdvancedTCA Systems 2A gate driver with low propagation delay, thereby minimizing n Network Routers and Switches peak reverse current under catastrophic fault conditions. Open n Computer Systems and Servers MOSFET and fuse faults are indicated at the FAULTB pin, which L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear is capable of sinking 5mA to drive an LED or opto isolator. Technology Corporation. All other trademarks are the property of their respective owners. Typical a T RTN 48V/50A Diode-OR R Z 30k Power Dissipation vs. Load Current R1 vs Load Current 33k 40 C1 V V Z DD 2.2F LTC4371 FAULTB 30 DA DB GA GB SA SB V SCHOTTKY DIODE SS D1 (SBRT60U100CT) GREEN LED = R R DA DB MOSFETS GOOD 20 20k 20k V V A POWER OUT 36V TO M1* 50A LOAD SAVED 72V 10 M3* MOSFET V B (2IPT020N10N3) M2* 36V TO 4371 TA01a 0 72V 0 10 20 30 40 50 *M1-M4: IPT020N10N3 M4* CURRENT (A) 4371 TA01b 4371f 1 For more information www.linear.com/LTC4371 POWER DISSIPATION (W) ion pplica ions pplica ion uresLTC4371 a Te Maxi Mu M r a T (Notes 1, 2) Output Voltages Supply Voltage V .................................... 0.3V to 17V DD GA, GB ................................................... 0.3V to V DD Input Voltage FAULTB .................................................. 0.3V to 17V DA, DB (Note 3) .................................... 40V to 100V Operating Ambient Temperature Range SA, SB .................................................. 0.3V to 0.3V LTC4371C ................................................ 0C to 70C DC Currents LTC4371I .............................................40C to 85C V ......................................................................20mA Z Storage Temperature Range .................. 65C to 150C DA, DB ............................................................... 1mA Lead Temperature (Soldering, 10 sec) Single Pulse Current (6ms) DA, DB ........................10mA MS Package ......................................................300C p in c F T TOP VIEW TOP VIEW DA 1 10 DB DA 1 10 DB GA 2 9 GB GA 2 9 GB 11 SA 3 8 SB SA 3 8 SB V 4 7 FAULTB Z V 4 7 FAULTB Z V 5 6 V DD SS V 5 6 V DD SS MS PACKAGE 10-LEAD PLASTIC MSOP DD PACKAGE 10-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 160C/W T = 125C, = 43C/W (NOTE 4) JMAX JA JMAX JA EXPOSED PAD (PIN 11) PCB V CONNECTION OPTIONAL SS o r Der i n F Ma T (