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LTC4252A-1IMS Datasheet(PDF) 1 Page - Linear Technology |
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LTC4252A-1IMS Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LTC4252-1/LTC4252-2 LTC4252A-1/LTC4252A-2 1 425212fb The LTC ®4252 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. Adjustable undervoltage and overvoltage detectors dis- connect the load whenever the input supply exceeds the desired operating range. The LTC4252’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 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. The LTC4252-1/LTC4252A-1 latch off after a circuit breaker fault times out. The LTC4252-2 provides automatic retry after a fault. The LTC4252A-1/LTC4252A-2 feature tight ±1% undervoltage/overvoltage threshold accuracy. The LTC4252 is available in either an 8-pin or 10-pin MSOP. ■ Hot Board Insertion ■ Electronic Circuit Breaker ■ – 48V Distributed Power Systems ■ Negative Power Supply Control ■ Central Office Switching ■ High Availability Servers ■ ATCA ■ Allows Safe Board Insertion and Removal from a Live – 48V Backplane ■ Floating Topology Permits Very High Voltage Operation ■ Programmable Analog Current Limit With Circuit Breaker Timer ■ Fast Response Time Limits Peak Fault Current ■ Programmable Soft-Start Current Limit ■ Programmable Timer with Drain Voltage Accelerated Response ■ ±1% Undervoltage/Overvoltage Threshold Accuracy (LTC4252A) ■ Adjustable Undervoltage/Overvoltage Protection ■ LTC4252-1/LTC4252A-1: Latch Off After Fault ■ LTC4252-2: Automatic Retry After Fault ■ Available in 8-Pin and 10-Pin MSOP Packages Negative Voltage Hot Swap Controllers – 48V/2.5A Hot Swap Controller 4252-1/2 TA01 GND OV UV VEE VIN SENSE SS TIMER GATE PWRGD DRAIN LTC4252-1 R1 402k 1% R2 32.4k 1% CT 0.33 µF CSS 68nF CC 18nF –48V RS 0.02 Ω Q1 IRF530S VOUT RC 10 Ω R3 5.1k RIN 3 × 1.8k IN SERIES 1/4W EACH C1 10nF CIN 1 µF CL 100 µF GND (SHORT PIN) + RD 1M LOAD EN * * M0C207 4252-1/2 TA01a GATE 5V/DIV SENSE 2.5A/DIV PWRGD 10V/DIV 1ms/DIV VOUT 20V/DIV Start-Up Behavior FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. |
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