LTC4350 Hot Swappable NOT RECOMMENDED FOR NEW DESIGNS Load Share Controller Contact Linear Technology for Potential Replacement Fae Tseru Dpircse Tnoi n Build N + 1 Redundant Supply The LTC 4350 is a load share controller that allows sys- n Hot Swap Power Supplies tems to equally load multiple power supplies connected n Isolates Supply Failures from Output in parallel. The output voltage of each supply is adjusted + n Eliminates ORing Diodes using the SENSE input until all currents match the share n Identifies and Localizes Output Low, Output High bus. The LTC4350 also isolates supply failures by turning and Open-Circuit Faults off the series pass transistors and identifying the failed n Output Voltages from 1.5V to 12V supply. The failed supply can then be removed and replaced n 16-Lead Narrow SSOP Package with a new unit without turning off the system power. The LTC4350 is available in a 16-pin narrow SSOP package. a acilpp Tsnoi L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Servers and Network Equipment n Telecom and Base Station Equipment n Distributed Power Systems T lacipy a acilpp Tn oi 5V Load Share (5A per Module) + V SHARE BUS V OUT OUT + SENSE 0.010 SUD50N03-07 + OUT 51 100 37.4k 0.1F 0.1F + GATE R R 12.1k FB VICOR* V CC VI-J30-CY 43.2k I 274k OUT UV LTC4350 STATUS STATUS OV SB TIMER R SET 121k 12.1k 0.1F GAIN COMP1 GND COMP2 1000pF 4.7F TRIM 0.1F 100 470k 34k 150 SENSE OUT + SENSE 0.010 SUD50N03-07 + OUT 51 100 37.4k 0.1F 0.1F + GATE R R FB 12.1k VICOR* V CC 43.2k I VI-J30-CY 274k OUT UV LTC4350 STATUS STATUS OV SB TIMER R SET 121k 12.1k 0.1F GAIN COMP1 GND COMP2 4.7F TRIM 0.1F 1000pF 100 470k 34k 150 SENSE OUT + *LOAD SHARING CIRCUIT WORKS WITH MOST POWER SUPPLIES THAT HAVE A SENSE OR FB PIN 4350 TA01 4350fb LTC4350 a ulosb T e Mixa Mu M r a Tsgni p ni c no Farugi Tnoi (Note 1) TOP VIEW Supply Voltage (V ) ................................................17V CC UV 1 16 V CC Input Voltage OV 2 15 STATUS TIMER ................................................... 0.3V to 1.2V TIMER 3 14 GATE + R , R (Note 2) ...................................... 0.3V to 17V + GAIN 4 13 R FB ......................................................... 0.3V to 5.3V COMP2 5 12 R OV, UV ....................................................... 0.3V to 17V COMP1 6 11 I OUT Output Voltage SB 7 10 R SET COMP1 .................................................... 0.3V to 6V GND 8 9 FB COMP2 .................................................... 0.3V to 3V GN PACKAGE 16-LEAD PLASTIC SSOP GAIN, SB ............................................... 0.3V to 5.6V T = 150C, = 135C/W JMAX JA GATE (Note 3) ............................................ 0.3V to 20V I , STATUS ............................................. 0.3V to 17V OUT R ............................................................. 0.3V to 1V SET Operating Temperature Range LTC4350C ................................................ 0C to 70C LTC4350I .............................................40C to 85C Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec)...................300C o r D re i n Fro Ma Tnoi LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4350CGN PBF LTC4350CGN TRPBF 4350 16-Lead Plastic SSOP 0C to 70C LTC4350IGN PBF LTC4350IGN TRPBF 4350I 16-Lead Plastic SSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: