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LTC4214-1 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4214-1 Datasheet(HTML) 1 Page - Linear Technology |
1 / 32 page LTC4214-1/LTC4214-2 1 421412f TYPICAL APPLICATIO APPLICATIO S DESCRIPTIO FEATURES The LTC ®4214 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 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 adjust- able 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. s Hot Board Insertion s Electronic Circuit Breaker s Negative Power Supply Control s Central Office Switching s High Availability Servers s Disk Arrays s Optical Networking/Switching s ECL , LTC and LT are registered trademarks of Linear Technology Corporation. s Allows Safe Board Insertion and Removal from a Live Backplane s Controls Supplies from 0V to –16V s Adjustable Analog Current Limit With Circuit Breaker Timer s Fast Response Time Limits Peak Fault Current s Adjustable Soft-Start Current Limit s Adjustable Timer with Drain Voltage Accelerated Response s Adjustable Undervoltage/Overvoltage Protection s LTC4214-1: Latch Off After Fault s LTC4214-2: Automatic Retry After Fault s Available in the 10-Pin MSOP Package Negative Low Voltage Hot Swap Controllers Hot Swap is a trademark of Linear Technology Corporation. – 5.2V/5A ECL Supply Hot Swap Controller Start-Up Behavior GATE 5V/DIV SENSE 20mV/DIV VOUT 5V/DIV PWRGD 5V/DIV 4214 TA02 4214 TA01 GND 3.3V UV/OV VEE VIN SENSE SS TIMER GATE PWRGD LTC4214-1 34k 1% 10 Ω 470 Ω 2k 100nF 32.4k 1% 5.6nF SMAJ7A PUSH RESET 3.3nF 10nF –5.2V 0.01 Ω IRF7413 GND EN –5.2V ECL 10 Ω 1 9, 8 10 3 7 2 6 4 5 1nF 0.1 µF CLOAD 100 µF GND (SHORT PIN) + BSS138 75k 22 Ω DRAIN |
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