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LT4250 Datasheet(PDF) 1 Page - Linear Technology |
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LT4250 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 34 page  LTC4253/LTC4253A 1 425353afe – 48V/2.5A Hot Swap Controller Start-Up Behavior TYPICAL APPLICATION FEATURES DESCRIPTION –48V Hot Swap Controllers with Sequencer The LTC®4253/LTC4253A negative voltage Hot Swap™ controllers allow 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 condi- tions. The LTC4253/LTC4253A latch off after a circuit fault. Adjustable undervoltage and overvoltage detectors dis- connect the load whenever the input supply exceeds the desired operating range. The LTC4253/LTC4253A’s supply input is shunt-regulated, allowing safe operation with very high supply voltages. A multifunction timer delays initial start-up and controls the circuit breaker’s response time. The circuit breaker’s response time can be accelerated by sensing excessive MOSFET drain voltage, keeping the MOSFET within its safe operating area (SOA). An adjustable soft-startcircuitcontrolsMOSFETinrushcurrentatstart-up. Three power good outputs are sequenced by an adjustable timer and two ENABLE inputs to enable external power modules at start-up or disable them if the circuit breaker trips. The LTC4253A features tight ±1% undervoltage/ overvoltage threshold accuracy. The LTC4253/LTC4253A are available in a 16-pin SSOP. APPLICATIONS n Allows Safe Board Insertion and Removal from a Live –48V Backplane n Floating Topology Permits Very High Voltage Operation n Adjustable Analog Current Limit with Breaker Timer Ideal for Two Battery Feeds n Fast Response Time Limits Peak Fault Current n Adjustable Undervoltage/Overvoltage Protection with ±1% Threshold Accuracy (LTC4253A) n Three Sequenced Power Good Outputs n Adjustable Soft-Start Current Limit n Adjustable Timer with Drain Voltage Accelerated Response n Latchoff After Fault n Available in a 16-Pin SSOP Package n –48V Distributed Power Systems n Negative Power Supply Control n Central Office Switching n High Availability Servers n Disk Arrays L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. 5.6k 5.6k 5.6k † PWRGD1 VIN EN2 EN3 VIN VEE LTC4253 LOAD1 PWRGD2 PWRGD3 OV DRAIN SS GATE SQTIMER SENSE TIMER EN LOAD2 EN LOAD3 EN 2.5k 15k(1/4W)/6 UV RESET 4253 TA01 10Ω 1M 0.02Ω IRF530S *DIODES, INC. †MOC207 ††RECOMMENDED FOR HARSH ENVIRONMENTS. 18nF 0.33μF 0.1μF 68nF 10nF + 100μF B3100* 402k 1% – 48V A – 48V B – 48V RTN – 48V RTN B3100* † † 32.4k 1% 1μF DIN †† DDZ13B* GATE 10V SS 1V SENSE 50mV VOUT 50V 1ms/DIV 4253 TA01b NOT RECOMMENDED FOR NEW DESIGNS Please See LTC4253B for Drop-In Replacement |
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