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LTC4215

Linear Technology
Part Number LTC4215
Manufacturer Linear Technology
Description Hot Swap Controller
Published Sep 21, 2009
Detailed Description LTC4215/LTC4215-2 Hot Swap Controller with I2C Compatible Monitoring FEATURES n Allows Safe Insertion into Live Backpla...
Datasheet PDF File LTC4215 PDF File

LTC4215
LTC4215

Overview
LTC4215/LTC4215-2 Hot Swap Controller with I2C Compatible Monitoring FEATURES n Allows Safe Insertion into Live Backplane n 8-Bit ADC Monitors Current and Voltage n I2C/SMBus Interface n Wide Operating Voltage Range: 2.
9V to 15V n 20μs (LTC4215) or 420μs (LTC4215-2) Circuit Breaker Timeout n dI/dt Controlled Soft-Start n High Side Drive for External N-Channel MOSFET n No External Gate Capacitor Required n Input Overvoltage/Undervoltage Protection n Optional Latchoff or Auto-Retry After Faults n Alerts Host After Faults n Inrush Current Limit with Foldback n Available in 24-Pin (4mm × 5mm) QFN Package n LTC4215 also available in 16-Lead Narrow SSOP Package APPLICATIONS n Live Board Insertion n Electronic Circuit Breakers n Computers, Servers n Platform Management L, LT, LTC, LTM, Linear Technology, the Linear logo and Hot Swap are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.
S.
Patent including 7330065.
DESCRIPTION The LTC®4215/LTC4215-2 Hot Swap™ controllers allow a board to be safely inserted and removed from a live backplane.
Using an external N-channel pass transistor, board supply voltage and inrush current are ramped up at an adjustable rate.
An I2C interface and onboard ADC allow for monitoring of load current, voltage and fault status.
The device features adjustable foldback current limit and a soft-start pin that sets the dI/dt of the inrush current.
An I2C interface may configure the part to latch off or automatically restart after the LTC4215 detects a current limit fault.
The controller has additional features to interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a load card, and power-up either automatically upon insertion or wait for an I2C command to turn on.
The LTC4215 has a 20μs circuit breaker filter for applications that require a fast fault response time and it defaults to latchoff after an overcurrent fault...


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