LTC4218 Datasheet, PDF (1/16 Pages) Linear Technology – Hot Swap Controller

LTC4218
Hot Swap Controller
FEATURES
■ _{Wide Operating Voltage Range: 2.9V to 26.5V}
■ _{Adjustable, 5% Accurate (15mV) Current Limit}
■ _{Current Monitor Output}
■ _{Adjustable Current Limit Timer Before Fault}
■ _{Powergood and Fault Outputs}
■ _{Adjustable Inrush Current Control}
■ _{2% Accurate Undervoltage and Overvoltage}
Protection
■ _{Available in 16-Lead SSOP and 16-Pin 5mm × 3mm}
DFN Packages
APPLICATIONS
■ _{RAID Systems}
■ _{ATCA, AMC, μTCA Systems}
■ _{Server I/O Cards}
■ _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 powergood monitoring
are also provided.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
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
12V
10Ω
V_OUT
12V
+ ^6A
330μF
AUTO
RETRY
0.1μF
0.1μF
SENSE^– GATE SOURCE
SENSE⁺
V_DD
UV
LTC4218DHC-12
12V
10k
FLT
PG
1k
0.01μF
TIMER
INTV_CC
GND
I_MON
20k
ADC
4218 TA01a
V_IN
10V/DIV
I_IN
1A/DIV
V_OUT
10V/DIV
PG
10V/DIV
Power-Up Waveform
25ms/DIV
4218 TA01b
4218fb
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