Analog Devices

The LTC4210 is a 6-pin SOT-23 Hot Swap™controller that allows a board to be safely inserted and removed from a live backplane. An internal high side switch driver controls the GATE of an external N-channel MOSFET for a supply voltage ranging from 2.7V to 16.5V. The LTC4210 provides the initial timing cycle and allows the GATE to be ramped up at an adjustable rate.The LTC4210 features a fast current limit loop providing active current limiting together with a circuit breaker timer. The signal at the ON pin turns the part on and off and is also used for the reset function.This part is available in two options: the LTC4210-1 for automatic retry on overcurrent fault and the LTC4210-2 for latch off on an overcurrent fault.VinRangeRetry / LatchoffLTC4210-12.7V to 16.5VRetry After FaultLTC4210-22.7V to 16.5VLatch Off After FaultLTC4210-32.7V to 7VRetry After FaultLTC4210-42.7V to 7VLatch Off After FaultApplicationsHot Board InsertionElectronic Circuit BreakerIndustrial High Side Switch/Circuit Breaker

The LTC4211 is a Hot Swap controller that allows a board to be safely inserted and removed from a live backplane. An internal highside switch driver controls the gate of an external N-channel MOSFET for supply voltages ranging from 2.5V to 16.5V. The LTC4211 provides soft-start and in rush current limiting during the start-up period which has a programmable duration.Two on-chip current limit comparators provide dual level overcurrent circuit breaker protection. The slow comparator trips at VCC– 50mV and activates in 20µs (or programmed by an external filter capacitor, MS only). The fast comparator trips at VCC– 150mV and typically responds in 300ns.The FB pin monitors the output supply voltage and signals theRESEToutput pin. The ON pin signal turns the chip on and off and can also be used for the reset function. The MS package hasFAULTand FILTER pins to provide additional functions like fault indication, autoretry or latch-off modes, programmable current limit response time and programmable overvoltage protection using an external Zener diode clamp.ApplicationsElectronic Circuit BreakerHot Board Insertion and Removal (Either On Backplane or On Removable Card)Industrial High Side Switch/Circuit Breaker

The LTC4212 is a Hot Swap™controller that allows a board to be safely inserted and removed from a live backplane. An internal high side switch driver controls the gate of an external N-channel MOSFET for supply voltages ranging from 2.5V to 16.5V. The LTC4212 provides soft-start and inrush current limiting during the start-up period. It features a power-up timeout circuit that disconnects the system supply when the onboard supplies do not enter into regulation within an adjustable timeout period. The controller interfaces with external supply monitor ICs or directly with the PGOOD pin of a DC/DC converter. After normal power-up, a programmable power good glitch filter can be enabled to filter out short term dips in the supplies.Two current limit comparators provide dual level overcurrent circuit breaker protection. The slow comparator trips at VCC– 50mV and activates in 18µs. The fast comparator trips at VCC– 150mV and typically responds in 500ns.The LTC4212 can be configured for both latchoff and autoretry applications and is available in a 10-pin MSOP package.ApplicationsElectronic Circuit BreakerHot Board Insertion and RemovalSelf-Isolating Hot Swap Boards

The LTC4213 is an Electronic Circuit Breaker. An overcurrent circuit breaker senses the voltage across the drain and source terminals of an external N-channel MOSFET with no need for a sense resistor. The advantages are a lower cost and reduced voltage and power loss in the switch path. An internal high-side driver controls the external MOSFET gate.Two integrated comparators provide dual level overcurrent protection over the bias supply to ground common mode range. The slow comparator has 16µs response while the fast comparator trips in 1µs. The circuit breaker has three selectable trip thresholds: 25mV, 50mV and 100mV. An ON pin controls the ON/OFF and resets circuit breaker faults. READY signals the MOSFET is conducting and the circuit breaker is armed. The LTC4213 operates from VCC= 2.3V to 6V.APPLICATIONSElectronic Circuit BreakerHigh-Side SwitchHot Board Insertion

The LTC4214 negative voltage Hot Swap™controller allows a board to be safely inserted and removed from a live backplane. Output current is controlled by three stages of current limiting: a timed circuit breaker, active current limiting and a fast feedforward path that limits peak current under worst-case catastrophic fault conditions.Adjustable undervoltage and overvoltage detectors disconnect the load whenever the input supply exceeds the desired operating range. The LTC4214 controls negative supplies ranging from near zero to –16V. A multifunction timer delays initial start-up and controls the circuit breaker’s response time. This response time is accelerated by sensing excessive MOSFET drain voltage, keeping the MOSFET within its safe operating area (SOA). An adjustable soft-start circuit controls MOSFET inrush current at start-up. A power good status output can enable a power module at start-up or disable it if the circuit breaker trips.The LTC4214-1 latches off after a circuit breaker fault times out. The LTC4214-2 provides automatic retry after a fault. The LTC4214 is available in the 10-pin MSOP package.ApplicationsHot Board InsertionElectronic Circuit BreakerNegative Power Supply ControlCentral Office SwitchingHigh Availability ServersDisk ArraysOptical Networking/SwitchingECL

The LTC4215/LTC4215-2 Hot Swap™controllers allow a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, board supply voltage and inrush current are ramped up at an adjustable rate. An I2C interface and onboard ADC allow for monitoring of load current, voltage and fault status.The device features adjustable foldback current limit and a soft-start pin that sets the dI/dt of the inrush current. An I2C interface may configure the part to latch-off or automatically restart after the LTC4215 detects a current limit fault.The controller has additional features to interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a load card, and power-up either automatically upon insertion or wait for an I2C command to turn on.The LTC4215 has a 20μs circuit breaker filter for applications that require a fast fault response time and it defaults to latch-off after an overcurrent fault. The LTC4215-2 has an extended 420μs circuit breaker filter for applications where supply transients may exceed 20μs and it defaults to restart automatically after an overcurrent fault.Circuit Breaker TimeoutGeneral Purpose OutputsLTC421520μs1LTC4215-120μs3LTC4215-2420μs1LTC4215-3420μs3ApplicationsLive Board InsertionElectronic Circuit BreakersComputers, ServersPlatform Management

The LTC4216 is a positive low voltage Hot Swap™controller that allows a board to be safely inserted and removed from a live backplane. It controls load voltages ranging from 0V to 6V and isolates a severe fault with instantaneous analog current limiting.An internal high side switch driver controls the gate of an external N-channel MOSFET. An adjustable soft-start limits the rate of change of the inrush current at start-up for a large load capacitor. Together with an analog current limit amplifier, an electronic circuit breaker with adjustable response time provides dual level overcurrent protection. No external gate capacitor is required for the analog current limit loop compensation.The FB pin monitors the output supply voltage and signals theRESEToutput pin. An ON pin provides on/off control and aFAULTpin indicates the fault status. The LTC4216 is available in the 10-lead MSOP and 12-lead (4mm × 3mm) DFN packages.ApplicationsElectronic Circuit BreakerLive Board Insertion and RemovalIndustrial High Side Switch/Circuit BreakerOptical Networking

The LTC4217 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. A dedicated 12V version (LTC4217-12) contains preset 12V specific thresholds, while the standard LTC4217 allows adjustable thresholds.The LTC4217 provides separate inrush current control and a 5% accurate 2A 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. For a 5A pin compatible version, see LTC4232.ApplicationsRAID Systems, Solid State DrivesServer I/O CardsIndustrial

The LTC4218 is a Hot Swap controller that allows a board to be safely inserted and removed from a live backplane. An internal high side switch driver controls the gate of an external N-channel MOSFET for supply voltages from 2.9V to 26.5V. A dedicated 12V version (LTC4218-12) contains preset 12V specific thresholds, while the standard LTC4218 allows adjustable thresholds.The LTC4218 provides an accurate (5%) current limit with current foldback limiting. The current limit threshold can be adjusted dynamically using an external pin. Additional features include a current monitor output that amplifies the sense voltage for ground referenced current sensing. Overvoltage, undervoltage and power good monitoring are also provided.ApplicationsRAID SystemsATCA, AMC, μTCA SystemsServer I/O CardsIndustrial

The LTC4219 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 LTC4219 provides separate inrush current control and a 10% accurate 5.6A 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 and power good monitoring are also provided. The power good detection level and foldback current limit profile are internally preset for 5V (LTC4219-5) and 12V (LTC4219-12) applications.ApplicationsRAID SystemsServer I/O CardsIndustrial