LTC4215 Datasheet, PDF (1/24 Pages) Linear Technology – Hot Swap Controller with I2C Compatible Monitoring

FEATURES
■ _{Allows Safe Insertion into Live Backplane}
■ _{8-Bit ADC Monitors Current and Voltage}
■ _I²_{C/SMBus Interface}
■ _{Wide Operating Voltage Range: 2.9V to 15V}
■ _{dI/dt Controlled Soft-Start}
■ _{High Side Drive for External N-Channel MOSFET}
■ _{No External Gate Capacitor Required}
■ _{Input Overvoltage/Undervoltage Protection}
■ _{Optional Latchoff or Auto-Retry After Faults}
■ _{Alerts Host After Faults}
■ _{Inrush Current Limit with Foldback}
■ _{Available in 24-Lead (4mm x 5mm) QFN and}
16-Lead Narrow SSOP Packages
U
APPLICATIO S
■ _{Live Board Insertion}
■ _{Electronic Circuit Breakers}
■ _{Computers, Servers}
■ _{Platform Management}
LTC4215
Hot Swap Controller with
I²C Compatible Monitoring
DESCRIPTIO
The LTC^®4215 Hot Swap^TM controller allows 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Hot Swap is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
12V
SDA
SCL
ALERT
GND
BACKPLANE PLUG-IN
CARD
34k
0.1µF
0.005Ω _FDC653N
+
V_OUT
12V
C_{L 30.1k}
10Ω
V_DD
10V/DIV
20V
2.67k
0.1µF
1.74k
3.57k
UV V_DD SENSE⁺ SENSE^– GATE SOURCE
OV
FB
SDAO
SDAI
SCL
ALERT
LTC4215UFD
EN
ADIN
24k
INTV_CC
ON TIMER SS
GPIO
GND
4215 TA01a
68nF
INRUSH
CURRENT
2.5A/DIV
V_OUT
10V/DIV
V_GPIO
(POWERGOOD)
10V/DIV
C_L = 12000µF
CONTACT
BOUNCE
50ms/DIV
4215 TA01b
4215fb
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