Ideal Diode Controllers 20 MOSFET (BSC028N06NS) 8 15 SCHOTTKY DIODE (SBG2040CT) CURRENT (A) POWER DISSIPATION (W) 10 6 POWER SAVED 4 VOLTAGE SAVED 10 SCHOTTKY DIODE (SBG2040CT) 5 2 MOSFET (BSC028N06NS) 0 0 5 10 15 0 20 0 0.1 CURRENT (A) 0.3 0.4 0.2 FORWARD VOLTAGE (V) 0.5 Ideal diode controllers offer a simple low loss replacement to power Schottky diodes in high current applications. Linear Technology’s family of high power ideal diodes use N-channel MOSFETs to perform the function of a low forward voltage diode. This provides a more efficient solution and preserves precious board space by reducing the need for heat sinking. Linear control of the forward voltage drop across the MOSFET ensures smooth current delivery without oscillation, even under light loads. If a power source fails or is shorted, a fast <1µs turn-off minimizes reverse current transients. Ideal diode controllers are ideal for ORing supplies together to provide redundancy in the event of input failure or hard short. Additionally, ideal diodes can be used for output supply holdup during brief interruptions of input power. LTC4359 Ideal Diode Controller with Reverse Input Protection Wide Operating Voltage Range: 4V to 80V, Operates Through Cold Crank Reverse Voltage Protection to –40V On/Off Control of Forward Path Low Quiescent Current: 150µA Low Shutdown Current: 9µA –40°C to 125°C Operation n PROTECTS –40V n VOUT 4V to 80V n IQ = 150µA n n n LTC4371 Negative Voltage Ideal Diode-OR Controller RETURN VZ VDD n n DRAIN A FAULT DRAIN B VSS GATE A VA = –48V LTC4371 n n n GATE B n VOUT VB = –48V L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. –4.5V to Above –100V Operation Withstands > ±300V Transients Low 15mV Ideal Diode Drop Fast < 220ns Reverse Current Turn-Off 5mA Gate Pull-Up for AC Rectification Open Fuse and Open MOSFET Detection LTC4370 2-Supply Diode-OR Current Balancing Controller The LTC4370 enables two power supplies to share load current which spreads the heat to increase system reliability. Additional load-sharing benefits include faster recovery after supply failure, and the ability to operate supplies near their peak efficiency point. n n n n n n n 12V±0.3V Eliminates Need for Active Control of Input Supplies No Share Bus Required Blocks DC Reverse Current 0V to 18V High Side Operation Enable Inputs MOSFET On Status Outputs Dual Ideal Diode Mode I LTC4370 2I I 12V±0.3V LTC4352 Low Voltage Ideal Diode Controller with Monitoring 2.9V TO 18V TO LOAD 0V to 18V Supply ORing or Holdup Fast 0.5μs Gate Turn-On and Turn-Off Time Avoids Load Droop and Reverse DC Current Undervoltage and Overvoltage Protection Open MOSFET Detection Status and Fault Outputs Hot Swappable Reverse Current Enable Input n CPO SOURCE VIN GATE OUT STATUS VCC UV OV REV n MOSFET ON STATUS n n LTC4352 FAULT FAULT n n GND n Linear Technology N-Channel Ideal Diodes Part Number LTC4371 LTC4355* LTC4357* LTC4358 LTC4359* LTC4352* LTC4353 LTC4370 LTC4227 LTC4228 LTC4229 LTC4235 LTC4236 LTC4364* ORing Range Function –4.5V to > –100V 9V to 80V 9V to 80V 9V to 26.5V 4V to 80V 0V to 18V 0V to 18V 0V to 18V 2.9V to 18V 2.9V to 18V 2.9V to 18V 9V to 14V 2.9V to 18V 4V to 80V Dual Ideal Diode-OR with Monitoring Dual Ideal Diode-OR with Supply and Fuse Monitoring Single Ideal Diode Single Ideal Diode with Internal 5A FET Single Ideal Diode, Reverse Input Protection Single Ideal Diode with Monitoring Dual Ideal Diode with Enable Inputs Two Supply Diode-OR Current Balancing Controller Dual Ideal Diode-OR and Single Hot Swap Controller Dual Ideal Diode and Hot Swap Controller Ideal Diode and Hot Swap Controller Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor Surge Stopper with Ideal Diode, Reverse Input/Output Protection Package (mm × mm) 3 × 3 DFN-10, MSOP-10 4 × 3 DFN-14, SO-16, MSOP-16 2 × 3 DFN-6, MSOP-8 4 × 3 DFN-14, TSSOP-16 2 × 3 DFN-6, MSOP-8 3 × 3 DFN-12, MSOP-12 4 × 3 DFN-16, MSOP-16 4 × 3 DFN-16, MSOP-16 4 × 5 QFN-20, SSOP-16 4 × 5 QFN-28, SSOP-28 4 × 5 QFN-24, SSOP-24 4 × 5 QFN-20 4 × 5 QFN-28 4 × 3 DFN-14, MSOP-16, SO-16 *High temperature version available. www.linear.com/idealdiodes n 1-800-4-LINEAR 0216C