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LTC4253IGN Datasheet(PDF) 1 Page - Linear Technology |
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LTC4253IGN Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC4253 1 4253f The LTC ®4253 negative voltage Hot SwapTM 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. The LTC4253 latches off after a circuit fault. Programmable undervoltage and overvoltage detectors disconnect the load whenever the input supply exceeds the desired operating range. The LTC4253’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 safe operating area (SOA). A program- mable soft-start circuit controls MOSFET inrush current at start-up. Three power good outputs are sequenced by a program- mable timer to enable external power modules at start-up or disable them if the circuit breaker trips. The LTC4253 is available in 16-pin SSOP. s Hot Board Insertion s Electronic Circuit Breaker s – 48V Distributed Power Systems s Negative Power Supply Control s Central Office Switching s Programmable Current Limiting Circuit s High Availability Servers s Disk Arrays , LTC and LT are registered trademarks of Linear Technology Corporation. s Allows Safe Board Insertion and Removal from a Live – 48V Backplane s Floating Topology Permits Very High Voltage Operation s Programmable Analog Current Limit with Breaker Timer Ideal for Two Battery Feeds s Fast Response Time Limits Peak Fault Current s Latchoff After Fault s Three Sequenced Power Good Outputs s Programmable Soft-Start Current Limit s Programmable Timer with Drain Voltage Accelerated Response s Programmable Undervoltage/Overvoltage Protection – 48V Hot Swap Controller with Sequencer Hot Swap is a trademark of Linear Technology Corporation. R4 5.6k R3 5.6k R5 5.6k PWRGD1 VIN VIN VEE LTC4253 POWER MODULE 1 PWRGD2 PWRGD3 EN3 EN2 OV UV RESET DRAIN SS GATE SQTIMER SENSE TIMER EN POWER MODULE 2 EN POWER MODULE 3 EN RIN 2.8k 16k(1/4W)/6 11 3 4 12 2 516 15 1 EN3 4253 TA01 EN2 610 14 9 13 7 8 RC 10 Ω RD 1M RS 0.02 Ω Q1 IRF530S VIN CC 18nF CT 0.33 µF C1 10nF CSQ 0.1 µF CSS 68nF R6 POWER MODULE 1 OUTPUT POWER MODULE 2 OUTPUT VIN R7 + C3 0.1 µF C2 100 µF CIN 1 µF R2 32.4k 1% B3100* R1 402k 1% RESET – 48V RTN (SHORT PIN) – 48V A – 48V B (LONG PINS) – 48V RTN (LONG PIN) B3100* *DIODES, INC. †MOC207 †† † † † – 48V/2.5A Hot Swap Controller APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO |
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