LTC4353 Dual Low Voltage Ideal Diode Controller Fea T Descrip T n Low Loss Replacement for Power Diodes The LTC 4353 controls external N-channel MOSFETs to n Controls N-Channel MOSFETs implement an ideal diode function. It replaces two high n 0V to 18V Supply ORing or Holdup power Schottky diodes and their associated heat sinks, n 1s Gate Turn-On and Turn-Off Time saving power and board area. The ideal diode function n Enable Inputs permits low loss power supply ORing and supply holdup n MOSFET On-Status Outputs applications. n 16-Lead MSOP and DFN (4mm 3mm) Packages The LTC4353 regulates the forward-voltage drop across the MOSFET to ensure smooth current transfer in diode-OR applications. A fast turn-on reduces the load voltage a T droop during supply switchover. If the input supply fails n Redundant Power Supplies or is shorted, a fast turn-off minimizes reverse-current n Supply Holdup transients. n High Availability Systems and Servers The controller operates with supplies from 2.9V to 18V. If n Telecom and Network Infrastructure both supplies are below 2.9V, an external supply is needed L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap, PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other at the V pin. Enable inputs can be used to turn off the CC trademarks are the property of their respective owners. Protected by U.S. Patents, including 7920013 and 8022679. MOSFET and put the controller in a low current state. Status outputs indicate whether the MOSFETs are on or off. Typical a T 2.9V to 18V, 10A Ideal Diode-OR Output Maintained with Failing Input Supply Si4126DY 2.9V TO 18V 56nF* V IN1 CPO1 V GATE1 OUT1 IN1 EN1 V ONST1 MOSFET CC V V OUT IN2 0.1F LTC4353 ON-STATUS 10A OUTPUTS GND ONST2 V OUT EN2 CPO2 V GATE2 OUT2 IN2 V = 5.2V IN1 56nF* V = 5V IN2 I = 8A L C = 100F L 2.9V TO 18V 4353 TA01b 4353 TA01a Si4126DY 5s/DIV *OPTIONAL FOR FAST TURN-ON 4353f 1 VOLTAGE 2V/DIV ion pplica ions pplica ion uresLTC4353 a T e Maxi Mu M r a T (Notes 1, 2) V , V , OUT1, OUT2 Voltages ...................2V to 24V Operating Ambient Temperature Range IN1 IN2 V Voltage ............................................... 0.3V to 6.5V LTC4353C ................................................ 0C to 70C CC GATE1, GATE2 Voltages (Note 3) ............... 0.3V to 34V LTC4353I .............................................40C to 85C CPO1, CPO2 Voltages (Note 3) ................... 0.3V to 34V Storage Temperature Range .................. 65C to 150C EN1, EN2, ONST1, ONST2 Voltages .............0.3V to 24V Lead Temperature (Soldering, 10 sec) CPO1, CPO2 Average Current .................................10mA MS Package ......................................................300C ONST1, ONST2 Currents ...........................................5mA p c F T TOP VIEW TOP VIEW EN2 1 16 EN1 EN2 1 16 EN1 NC 2 15 GND NC 2 15 GND NC 3 14 V CC V 4 13 V NC 3 14 V IN2 IN1 CC GATE2 5 12 GATE1 V 4 13 V IN2 17 IN1 CPO2 6 11 CPO1 GATE2 5 12 GATE1 OUT2 7 10 OUT1 ONST2 8 9 ONST1 CPO2 6 11 CPO1 MS PACKAGE OUT2 7 10 OUT1 16-LEAD PLASTIC MSOP ONST2 8 9 ONST1 T = 125C, = 125C/W JMAX JA DE PACKAGE 16-LEAD (4mm 3mm) PLASTIC DFN T = 125C, = 43C/W JMAX JA EXPOSED PAD (PIN 17) PCB GND CONNECTION OPTIONAL o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4353CDE PBF LTC4353CDE TRPBF 4353 0C to 70C 16-Pin (4mm 3mm) Plastic DFN LTC4353IDE PBF LTC4353IDE TRPBF 4353 40C to 85C 16-Pin (4mm 3mm) Plastic DFN LTC4353CMS PBF LTC4353CMS TRPBF 4353 16-Pin Plastic MSOP 0C to 70C LTC4353IMS PBF LTC4353IMS TRPBF 4353 16-Pin Plastic MSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: