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LT1640HIS
LT1640L/LT1640H Negative Voltage Hot Swap Controller U DESCRIPTIO FEATURES s s s s s s s The LT®1640L/LT1640H is an 8-pin, negative voltage Hot SwapTM controller that allows a board to be safely inserted and removed from a live backplane. Inrush current is limited to a programmable value by controlling the gate voltage of an external N-channel pass transistor. The pass transistor is turned off if the input voltage is less than the programmable undervoltage threshold or greater than the overvoltage threshold. A programmable electronic circuit breaker protects the system against shorts. The PWRGD (LT1640L) or PWRGD (LT1640H) signal can be used to directly enable a power module. The LT1640L is designed for modules with a low enable input and the LT1640H for modules with a high enable input. Allows Safe Board Insertion and Removal from a Live – 48V Backplane Operates from –10V to – 80V Programmable Inrush Current Programmable Electronic Circuit Breaker Programmable Overvoltage Protection Programmable Undervoltage Lockout Power Good Control Output U APPLICATIO S s s s Central Office Switching – 48V Distributed Power Systems Negative Power Supply Control The LT1640L/LT1640H is available in 8-pin PDIP and SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. U TYPICAL APPLICATIO GND (SHORT PIN) GND Input Inrush Current R4† 562k 1% R5† 9.09k 1% UV = 37V R6† 10k 1% 8 VDD 3 UV LT1640L 2 PWRGD GATE INRUSH CURRENT 1A/DIV 1 DRAIN OV VEE SENSE 4 OV = 71V 5 6 GATE – VEE 10V/DIV 7 1N4148 * 3 – 48V C1† 150nF 25V R1† 0.02Ω 5% 1 R2 10Ω 5% 4 2 * DIODES INC. SMAT70A † THESE COMPONENTS ARE APPLICATION SPECIFIC AND MUST BE SELECTED BASED UPON OPERATING CONDITIONS AND DESIRED PERFORMANCE. SEE APPLICATIONS INFORMATION. R3† † 18k C2 5% 3.3nF 100V + VEE 50V/DIV 2 Q1 IRF530 C3 0.1µF 100V DRAIN 50V/DIV C4 100µF 100V ON/OFF 1 9 VOUT+ VIN+ 8 SENSE + 7 TRIM 6 SENSE – 4 5 VOUT– VIN– LUCENT JW050A1-E 5V + C5 100µF 16V CONTACT BOUNCE 5ms/DIV 1640 F06b 1640 TA01 1640lhfb 1
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