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LT4220

Linear Technology
Part Number LT4220
Manufacturer Linear Technology
Description Dual Supply Hot Swap Controller
Published Mar 22, 2005
Detailed Description LT4220 Dual Supply Hot Swap Controller FEATURES s s s s s DESCRIPTIO s s s s Hot SwapTM Controller for Positive and N...
Datasheet PDF File LT4220 PDF File

LT4220
LT4220

Overview
LT4220 Dual Supply Hot Swap Controller FEATURES s s s s s DESCRIPTIO s s s s Hot SwapTM Controller for Positive and Negative Supplies Supply Tracking Mode ±2.
7V to ±16.
5V Operation Analog Current Limit with Foldback Allows Safe Board Insertion and Removal from a Live Backplane Open-Collector Power Good Comparators Automatic Retry or Latchoff After a Current Fault Dual Undervoltage Lockout Comparator Inputs Current Fault Indication The LT®4220 16-pin dual voltage Hot Swap controller allows a board to be safely inserted and removed from a live backplane.
The device operates with any combination of 2.
7V to 16.
5V and –2.
7V to –16.
5V supplies.
Using two external N-channel pass transistors, the board supply voltages can be ramped up at an adjustable rate.
A selectable tracking mode allows dual supply tracking control for ramping the positive and negative supplies together.
The LT4220 features foldback current limit and latches off both gates if either supply remains in current limit longer than an adjustable time period.
The IC can be configured for automatic restart after a delay set by the same timer.
A power good signal indicates when the output voltages monitored by the two FB comparators are within tolerance, and the gate drive signals are at their full on voltage.
The LT4220 is available in a 16-lead narrow SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
U APPLICATIO S s s s s s Live Board Insertion RAID Systems –5.
2V ECL Supplies Industrial Controls Split Supply Systems TYPICAL APPLICATIO 12V VCC VIN+ R13 10Ω C4 100nF ±12V 10A Hot Swap Controller RS + 0.
005Ω Q1 SUB85N03-04 12V VOUT+ C1 10nF Z1* R5 10Ω 7 16 VCC 15 SENSE + R6 1k + CL1 CONNECTOR 2 CONNECTOR 1 R1 36.
5k R2 4.
99k R15 20k TRACK 12 ON+ C7 10nF C6 1µF 11 FAULT 8 TIMER LT4220 9 GND 14 GATE+ 10 PWRGD 13 R16, 20k + FB R10 4.
99k R12 4.
99k R9 36.
5k D1 IN4001 R4 4.
99k R3 36.
5k C8 10nF FB 6 ON...


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