LTC4218_15 Datasheet, PDF (1/18 Pages) Linear Technology – Hot Swap Controller

LTC4218
Hot Swap Controller
Features
n _{Wide Operating Voltage Range: 2.9V to 26.5V}
n _{Adjustable, 5% Accurate 15mV Current Limit}
n _{Current Monitor Output}
n _{Adjustable Current Limit Timer Before Fault}
n _{Power Good and Fault Outputs}
n _{Adjustable Inrush Current Control}
n _{2% Accurate Undervoltage and Overvoltage}
Protection
n _{Available in 16-Lead SSOP and 16-Pin 5mm × 3mm}
DFN Packages
Applications
n _{RAID Systems}
n _{ATCA, AMC, µTCA Systems}
n _{Server I/O Cards}
n _Industrial
Description
The LTC^®4218 is a Hot Swap™ controller that allows a board
to be safely inserted and removed from a live backplane.
An internal high side switch driver controls the gate of an
external N-channel MOSFET for supply voltages from 2.9V
to 26.5V. A dedicated 12V version (LTC4218-12) contains
preset 12V specific thresholds, while the standard LTC4218
allows adjustable thresholds.
The LTC4218 provides an accurate (5%) current limit with
current foldback limiting. The current limit threshold can
be adjusted dynamically using an external pin. Additional
features include a current monitor output that amplifies
the sense voltage for ground referenced current sensing.
Overvoltage, undervoltage and power good monitoring
are also provided.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
12V, 6A Card Resident Application
2mΩ
Si7108DN
V_OUT
12V
12V
+ ^6A
330µF
10Ω
AUTO
RETRY
0.1µF
0.1µF
SENSE^– GATE SOURCE
SENSE⁺
V_DD
OV
UV ^{LTC4218DHC-12}
12V
10k
FLT
PG
TIMER
I_SET
INTV_CC
GND
I_MON
20k
1k
0.01µF
ADC
4218 TA01a
V_IN
10V/DIV
I_IN
1A/DIV
V_OUT
10V/DIV
PG
10V/DIV
Power-Up Waveform
CONTACT BOUNCE
25ms/DIV
4218 TA01b
For more information www.linear.com/LTC4218
4218fg
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