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LT4254 Datasheet(PDF) 1 Page - Linear Technology |
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LT4254 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 16 page  LT4254 1 4254fb The LT ®4254 is a high voltage Hot Swap TM controller that allows a board to be safely inserted and removed from a live backplane. An internal driver controls the high side N-channel MOSFET gate for supply voltages ranging from 10.8V to 36V. The part features an open-circuit detect (OPEN) output that indicates abnormally low load current conditions. The LT4254 features an adjustable analog foldback cur- rent limit. If the supply remains in current limit for more than a programmable time, the N-channel MOSFET shuts off, the PWRGD output goes low and the LT4254 either automatically restarts after a time-out delay or latches off until the UV pin is cycled low. The RETRY pin sets whether the part will automatically restart after an overcurrent fault or if it will latch off until the UV pin is cycled low. The PWRGD output indicates when the output voltage rises above a programmed level. An external resistor string from VCC provides programmable undervoltage and overvoltage protection. ■ Hot Board Insertion ■ Electronic Circuit Breaker/Power Bussing ■ Industrial High Side Switch/Circuit Breaker ■ 24V Industrial/Alarm Systems ■ 12V and 24V Distributed Power Systems ■ Allows Safe Board Insertion and Removal from a Live Backplane ■ Controls Supply Voltage from 10.8V to 36V ■ Foldback Current Limiting ■ Open Circuit and Overcurrent Fault Detect ■ Drives an External N-Channel MOSFET ■ Automatic Retry or Latched Off Operation After Overcurrent Fault ■ Programmable Supply Voltage Power-Up Rate ■ Undervoltage and Overvoltage Protection ■ Open MOSFET Detection ■ Available in 16-Lead SSOP Package Positive High Voltage Hot Swap Controller with Open-Circuit Detect 4254 TA01 R5 0.025 Ω LT4254 SENSE VCC GATE FB PWRGD RETRY UV OV TIMER GND VIN 24V GND (SHORT PIN) Q1 IRF530 D1 CMPZ5241B 11V R3 40.2k R2 40.2k R1 324k R7 100 Ω R9 40.2k R6 10 Ω R8 140k PWRGD VOUT 24V 1.5A R4 27k CL C2 33nF C3 0.1 µF C1 10nF OPEN UV = 20V OV = 40V PWRGD = 18V 24V, 2A Hot Swap Controller VIN 20V/DIV VOUT 20V/DIV INRUSH CURRENT 500mA/DIV PWRGD 20V/DIV 2.5ms/DIV 4245 TA02 LT4254 Start-Up Behavior DESCRIPTIO FEATURES APPLICATIO S , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. CL = 168µF CONTACT BOUNCE TYPICAL APPLICATIO |
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