LTC4352 Low Voltage Ideal Diode Controller with Monitoring Fea T Descrip T n Low Loss Replacement for Power Diode The LTC 4352 creates a near-ideal diode using an external n Controls N-Channel MOSFET N-channel MOSFET. It replaces a high power Schottky diode n 0V to 18V Supply ORing or Holdup and the associated heat sink, saving power and board area. n 0.5s Turn-On and Turn-Off Time The ideal diode function permits low loss power ORing n Undervoltage and Overvoltage Protection and supply holdup applications. n Open MOSFET Detect The LTC4352 regulates the forward voltage drop across n Status and Fault Outputs the MOSFET to ensure smooth current transfer in diode- n Hot Swappable OR applications. A fast turn-on reduces the load voltage n Reverse Current Enable Input droop during supply switch-over. If the input supply fails n 12-Pin MSOP and DFN (3mm 3mm) Packages or is shorted, a fast turn-off minimizes reverse currents. The controller operates with supplies from 2.9V to 18V. a T For lower voltages, an external supply is needed at the V pin. Power passage is disabled during undervoltage CC n Redundant Power Supplies or overvoltage conditions. The controller also features an n Supply Holdup open MOSFET detect circuit that flags excessive voltage n Telecom Infrastructure drop across the pass transistor in the on state. A REV pin n Computer Systems and Servers enables reverse current, overriding the diode behavior when desired. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical a T 2.9V to 18V Ideal Diode Power Dissipation vs Load Current 4.0 Si7336ADP 3.5 2.9V TO 18V TO LOAD 0.1F* 3.0 DIODE (SBG1025L) 2.5 CPO SOURCE V GATE OUT IN 2.0 MOSFET ON V STATUS CC POWER STATUS 0.1F 1.5 UV SAVED LTC4352 OV FAULT FAULT 1.0 REV GND 0.5 4352 TA01 MOSFET (Si7336ADP) *OPTIONAL 0 0 2 4 6 8 10 LOAD CURRENT (A) 4352 TA01b 4352fa 1 POWER DISSIPATION (W) ion pplica ions pplica ion uresLTC4352 a Te Maxi Mu M r a T (Notes 1, 2) FAULT, STATUS Currents ..........................................5mA V , SOURCE Voltages ...................................2V to 24V IN Operating Ambient Temperature Range V Voltage .................................................. 0.3V to 7V CC LTC4352C ................................................ 0C to 70C OUT Voltage ...................................................2V to 24V LTC4352I .............................................40C to 85C CPO, GATE Voltages (Note 3) ..................... 0.3V to 30V LTC4352H .......................................... 40C to 150C CPO D.C. Current ...................................................10mA Storage Temperature Range .................. 65C to 150C UV, OV, REV Voltages ................................ 0.3V to 24V Lead Temperature (Soldering, 10 sec) FAULT, STATUS Voltages ............................ 0.3V to 24V MS Package ......................................................300C p in c F T TOP VIEW TOP VIEW V 1 12 SOURCE IN 1 SOURCE V 12 IN V 2 11 GATE CC V 2 11 GATE CC 3 10 CPO UV UV 3 10 CPO 13 4 9 GND OV 4 9 GND OV STATUS 5 8 OUT 5 OUT STATUS 8 FAULT 6 7 REV 6 7 REV FAULT MS PACKAGE DD PACKAGE 12-LEAD PLASTIC MSOP 12-PIN (3mm 3mm) PLASTIC DFN T = 150C, = 164C/W T = 150C, = 43C/W JMAX JA JMAX JA EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4352CDD PBF LTC4352CDD TRPBF LDPJ 12-Pin (3mm 3mm) Plastic DFN 0C to 70C LTC4352IDD PBF LTC4352IDD TRPBF LDPJ 12-Pin (3mm 3mm) Plastic DFN 40C to 85C LTC4352HDD PBF LTC4352HDD TRPBF LDPJ 12-Pin (3mm 3mm) Plastic DFN 40C to 150C LTC4352CMS PBF LTC4352CMS TRPBF 4352 12-Lead Plastic MSOP 0C to 70C LTC4352IMS PBF LTC4352IMS TRPBF 4352 12-Lead Plastic MSOP 40C to 85C LTC4352HMS PBF LTC4352HMS TRPBF 4352 12-Lead Plastic MSOP 40C to 150C 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 non-standard lead based finish parts. For more information on lead free part marking, go to: