Analog Devices

The LTC4232-1 is an integrated solution for Hot Swap applications that allows a board to be safely inserted and removed from a live backplane. The part integrates a Hot Swap controller, power MOSFET and current sense resistor in a single package for small form factor applications.The LTC4232-1 provides separate inrush current control and a 10% accurate 5A current limit with foldback current limiting. The current limit threshold can be adjusted dynamically using an external pin. Additional features include a current monitor output that amplifies the sense resistor voltage for ground referenced current sensing and a MOSFET temperature monitor output. Thermal limit, overvoltage, undervoltage and power good monitoring are also provided.The PCI Express compliant LTC4232-1 allows faster turn-on than the LTC4232 by providing a shorter (16ms) debounce delay and external control of the GATE ramp rate.ApplicationsRAID Systems, Solid State DrivesServer I/O CardsPCI Express SystemsIndustrial

The LTC4233 is an integrated solution for Hot Swap™applications that allows a board to be safely inserted and removed from a live backplane. The part integrates a Hot Swap controller, power MOSFET and current sense resistor in a single package for small form factor applications. The MOSFET Safe Operating Area is production tested and guaranteed for the stresses in Hot Swap applications.The LTC4233 provides separate inrush current control and an 11% accurate 11.2A current limit with output dependent foldback. The current limit threshold can be adjusted dynamically using the ISETpin. Additional features include a current monitor output that amplifies the sense resistor voltage for ground referenced current sensing and a MOSFET temperature monitor output. Thermal limit, overvoltage, undervoltage and power good monitoring are also provided. For a 20A pin compatible version see LTC4234.ApplicationsHigh Availability ServersSolid State DrivesIndustrialNetwork Routers and Switches

The LTC4234 is an integrated solution for Hot Swap™applications that allows a board to be safely inserted and removed from a live backplane. The part integrates a Hot Swap controller, power MOSFET and current sense resistor in a single package for small form factor applications. The MOSFET Safe Operating Area is production tested and guaranteed for the stresses in Hot Swap applications.The LTC4234 provides separate inrush current control and an 11% accurate 22.5A current limit with output dependent foldback. The current limit threshold can be adjusted dynamically using the ISETpin. Additional features include a current monitor output that amplifies the sense resistor voltage for ground referenced current sensing and a MOSFET temperature monitor output. Thermal limit, overvoltage, undervoltage and power good monitoring are also provided. For a 10A compatible version, see LTC4233.ApplicationsHigh Availability ServersSolid State DrivesIndustrial240W, 12V Systems

The LTC4235 offers ideal diode-OR and Hot Swap™functions for two 12V power rails by controlling external N-channel MOSFETs. MOSFETs acting as ideal diodes replace two high power Schottky diodes and the associated heat sinks, saving power and board area. A Hot Swap control MOSFET allows a board to be safely inserted and removed from a live backplane by limiting inrush current. The supply output is also protected against short-circuit faults with a foldback current limit and circuit breaker.The LTC4235 regulates the forward voltage drop across the MOSFETs to ensure smooth current transfer from one supply to the other without oscillation. The ideal diodes turn on quickly to reduce the load voltage droop during supply switchover. If the input supply fails or is shorted, a fast turn-off minimizes reverse-current transients.A current sense amplifier translates the voltage across the sense resistor to a ground referenced signal. The LTC4235 allows turn-on/off control, and reports fault and power good status for the supply.ApplicationsRedundant Power SuppliesHigh Availability Systems and ServersTelecom and Network Infrastructure

The LTC4236 offers ideal diode-OR and Hot Swap functions for two power rails by controlling external N-channel MOSFETs. MOSFETs acting as ideal diodes replace two high power Schottky diodes and the associated heat sinks, saving power and board area. A Hot Swap control MOSFET allows a board to be safely inserted and removed from a live backplane by limiting inrush current. The supply output is also protected against short-circuit faults with a fast acting foldback current limit and electronic circuit breaker.The LTC4236 regulates the forward voltage drop across the ideal diode MOSFETs to ensure smooth current transfer from one supply to the other without oscillation. The ideal diode MOSFETs turn on quickly to reduce the load voltage droop during supply switchover. If the input supply fails or is shorted, a fast turn-off minimizes reverse current transients.A current sense amplifier translates the voltage across the sense resistor to a ground referenced signal. The LTC4236 provides adjustable start-up delay, turn-on/-off control, and reports fault and power good status for the supply.ApplicationsRedundant Power SuppliesHigh Availability Systems and ServersTelecom and Network Infrastructure

The LTC4241 is a Hot Swap controller that allows a board to be safely inserted and removed from a live PCI-bus slot. It has a primary controller that controls the four PCI supplies and an independent auxiliary controller to control the 3.3V auxiliary supply. External N-channel transistors are used to control the 3.3V, 5V and 3.3V auxiliary supplies while on-chip switches control the –12V and 12V supplies. The 3.3V, 5V and 3.3V auxiliary supplies can be ramped up at an adjustable rate. Electronic circuit breakers protect all five supplies against overcurrent faults. The foldback current limit feature reduces current spikes and power dissipation when shorts occur. ThePWRGDoutput of the primary controller indicates when all four PCI supplies are within tolerance. TheFAULToutput indicates an overcurrent condition for any of the five supplies.The LTC4241 is available in the 20-pin narrow SSOP package.ApplicationsPCI-Based ServersComputer Systems

The LTC4242 Hot Swap™controller allows safe board insertion and removal for two independent slots on a PCI Express backplane. External N-channel transistors control the 12V and 3.3V supplies while integrated switches control the 3.3V auxiliary supplies. Both 12V and 3.3V supplies can be ramped up at an adjustable rate. Dual level circuit breakers and fast active current limiting protect all supplies against overcurrent faults.A supply filter at the VCCpin allows the LTC4242 to endure supply transients. TheENinput detects the presence of a card in the PCI Express slot. TheFAULTandAUXFAULToutputs alert the system of overcurrent conditions on the main and auxiliary supplies, respectively.PGOODandAUXPGOODoutputs indicate proper main and auxiliary supply outputs.ApplicationsPCI Express-Based PC and ServersHot Swap Application for Triple Supply Systems

The LTC4244/LTC4244-1 are Hot Swap™controllers that allow a board to be safely inserted into and removed from a CompactPCI™bus slot. External N-channel transistors control the 5V and 3.3V supplies while on-chip switches control the ±12V supplies. The 3.3V and 5V supplies can be ramped up at an adjustable rate. Electronic circuit breakers protect all four supplies against overcurrent faults. After the power-up cycle is complete, the TIMER pin capacitor serves as auxiliary VCCallowing the LTC4244/LTC4244-1 to function without interruption in the presence of voltage spikes on the 12VINsupply. ThePWRGDoutput indicates when all four supplies are within tolerance. The OFF/ONpin is used to cycle board power or reset the circuit breaker. The PRECHARGE output can be used to bias the bus I/O pins during card insertion and extraction. PCI_RST# is combined on-chip with HEALTHY# in order to generate LOCAL_PCI_RST#.ApplicationsHot Board Insertion into CompactPCI Bus

The LTC4249 dual electronic circuit breaker (ECB) provides independent overcurrent protection to a pair of loads. Each channel has a precision enable input, current monitor output and ready status output. A single resistor configures the ECB threshold. If either channel detects an overcurrent condition, the corresponding breaker disconnects the input from the load.After a circuit breaker event, the open-drain RDY status output pulls low and the ECB latches off. Toggling the enable input turns the ECB back on after a 1 second cooloff period. An infinite retry option(–2) is also available. The cool-off timer, overtemperature sensor, short-circuit detector and inrush controller prevent operation outside the safe operating area of the circuit breakers.Precision enable inputs, ready outputs and analog current monitor outputs permit voltage sequencing and closed loop bias current control applications. ECB channels may be paralleled as needed. Load isolation and reverse current detection applications are also possible.APPLICATIONS5G mMIMO PA Array ProtectionIndustrial SafetyCondition MonitoringRelay ReplacementLoad Switching