LTC4355 Positive High Voltage Ideal Diode-OR with Input Supply and Fuse Monitors Features Description n Replaces Power Schottky Diodes The LTC 4355 is a positive voltage ideal diode-OR control- n Controls N-Channel MOSFETs ler that drives two external N-channel MOSFETs. Forming n 0.3s Turn-Off Time Limits Peak Fault Current the diode-OR with N-channel MOSFETs instead of Schottky n Wide Operating Voltage Range: 9V to 80V diodes reduces power consumption, heat dissipation and n Smooth Switchover without Oscillation PC board area. n No Reverse DC Current With the LTC4355, power sources can easily be ORed n Monitors V , Fuse, and MOSFET Diode IN together to increase total system reliability. The LTC4355 n Available in 14-Lead (4mm 3mm) DFN, can diode-OR two positive supplies or the return paths of 16-Lead MS and SO Packages two negative supplies, such as in a 48V system. In the forward direction the LTC4355 controls the volt- a age drop across the MOSFET to ensure smooth current transfer from one path to the other without oscillation. If n High Availability Systems a power source fails or is shorted, fast turnoff minimizes n AdvancedTCA (ATCA) Systems reverse current transients. n +48V and 48V Distributed Power Systems n Telecom Infrastructure Power fault detection indicates if the input supplies are L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and not in regulation, the inline fuses are blown, or the volt- Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the ages across the MOSFETs are greater than the fault property of their respective owners. threshold. t ypical a +48V Diode-OR Power Dissipation vs Load Current 7A 6 FDB3632 TO V = +48V IN1 LOAD 5 7A FDB3632 DIODE (MBR10100) V = +48V IN2 22k 22k 22k 4 340k 340k 22k 22k 3 POWER IN1 GATE1 IN2 GATE2 OUT SAVED MON1 VDSFLT 2 FUSEFLT1 LTC4355 SET FUSEFLT2 PWRFLT1 1 MON2 GND PWRFLT2 FET (FDB3632) 0 12.7k 12.7k GREEN LEDs 0 2 4 6 8 10 PANASONIC LN1351C CURRENT (A) GND 4355 TA02 4355 TA01 4355ff 1 For more information www.linear.com/LTC4355 POWER DISSIPATION (W) pplication pplicationsLTC4355 a bsolute Maxi Mu M r (Notes 1, 2) Supply Voltages Operating Ambient Temperature Range IN1, IN2 .................................................. 1V to 100V LTC4355C ................................................ 0C to 70C OUT ..................................................... 0.3V to 100V LTC4355I..............................................40C to 85C Input Voltages LTC4355H ..........................................40C to 125C MON1, MON2, SET .................................. 0.3V to 7V Storage Temperature Range ...................65C to 150C Output Voltages Lead Temperature (Soldering, 10 sec) GATE1 (Note 3) ................... V 0.2V to V + 13V MS, SO Packages ............................................. 300C IN1 IN1 GATE2 (Note 3) ................... V 0.2V to V + 13V IN2 IN2 PWRFLT1, PWRFLT2, VDSFLT, FUSEFLT1, FUSEFLT2 ............................... 0.3V to 8V pin con F TOP VIEW TOP VIEW IN1 1 16 MON1 IN1 1 14 MON1 TOP VIEW GATE1 2 15 PWRFLT1 GATE1 2 13 PWRFLT1 1 IN1 16 MON1 NC 3 14 FUSEFLT1 GATE1 2 15 PWRFLT1 OUT 3 12 FUSEFLT1 3 NC 14 FUSEFLT1 15 OUT 4 13 FUSEFLT2 GATE2 4 11 FUSEFLT2 OUT 4 13 FUSEFLT2 5 NC 12 PWRFLT2 NC 5 12 PWRFLT2 IN2 5 10 PWRFLT2 GATE2 6 11 MON2 VDSFLT 6 9 MON2 7 IN2 10 SET GATE2 6 11 MON2 VDSFLT 8 9 GND GND 7 8 SET IN2 7 10 SET MS PACKAGE NC 8 9 GND 16-LEAD PLASTIC MSOP DE14 PACKAGE T = 125C, = 120C/W 14-LEAD (4mm 3mm) PLASTIC DFN JMAX JA S PACKAGE T = 125C, = 43C/W JMAX JA 16-LEAD PLASTIC SO EXPOSED PAD (PIN 15) PCB GND CONNECTION OPTIONAL T = 125C, = 80C/W JMAX JA Der in F M LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4355CDE PBF LTC4355CDE TRPBF 4355 14-Lead (4mm 3mm) Plastic DFN 0C to 70C LTC4355IDE PBF LTC4355IDE TRPBF 4355 40C to 85C 14-Lead (4mm 3mm) Plastic DFN LTC4355CS PBF LTC4355CS TRPBF LTC4355CS 16-Lead Plastic SO 0C to 70C LTC4355IS PBF LTC4355IS TRPBF LTC4355IS 16-Lead Plastic SO 40C to 85C LTC4355CMS PBF LTC4355CMS TRPBF 4355 16-Lead Plastic MSOP 0C to 70C LTC4355IMS PBF LTC4355IMS TRPBF 4355 16-Lead Plastic MSOP 40C to 85C LTC4355HMS PBF LTC4355HMS TRPBF 4355 16-Lead Plastic MSOP 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are 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: