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LT4250H

Linear Technology
Part Number LT4250H
Manufacturer Linear Technology
Description Negative 48V Hot Swap Controller
Published Jun 27, 2008
Detailed Description LT4250L/LT4250H Negative 48V Hot Swap Controller FEATURES Allows Safe Board Insertion and Removal from a Live – 48V Bac...
Datasheet PDF File LT4250H PDF File

LT4250H
LT4250H

Overview
LT4250L/LT4250H Negative 48V Hot Swap Controller FEATURES Allows Safe Board Insertion and Removal from a Live – 48V Backplane s Circuit Breaker Immunity to Voltage Steps and Current Spikes s Programmable Inrush and www.
DataSheet4U.
com Short-Circuit Current Limits s Pin Compatible with LT1640L/LT1640H s Operates from –20V to – 80V s Programmable Overvoltage Protection s Programmable Undervoltage Lockout s Power Good Control Output s Bell-Core Compatible ON/OFF Threshold s DESCRIPTIO U APPLICATIO S s s s The LT®4250L/LT4250H are 8-pin, negative 48V Hot SwapTM controllers that allow 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 current limit protects the system against shorts.
After a 500µs timeout the current limit activates the electronic circuit breaker.
The PWRGD (LT4250L) or PWRGD (LT4250H) signal can be used to directly enable a power module.
The LT4250L is designed for modules with a low enable input and the LT4250H for modules with a high enable input.
The LT4250L/LT4250H are 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.
Central Office Switching – 48V Distributed Power Systems Negative Power Supply Control TYPICAL APPLICATIO –48V RTN (SHORT PIN) –48V RTN R4† 549k 1% 3 R5† 6.
49k 1% R6† 10k 1% UV 8 VDD 1 UV = 38.
5V UV RELEASE AT 43V OV = 71V LT4250L 2 OV VEE 4 SENSE 5 GATE 6 R3† 1k, 5% PWRGD DRAIN 7 VEE AND DRAIN 20V/DIV * –48V INPUT 1 0.
1µF 10V R1† 0.
02Ω 5% C1† 470nF 25V R2 10Ω 5% C2† 15nF 100V 2 ON/OFF 1 9 VOUT+ VIN+ 8 + SENSE 7 TRIM – 6 SENSE 4 5 VOUT– VIN– LUCENT JW050A1-E ID (Q1) 5A/DIV Q1 IRF530 –48V INPUT 2 * ...


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