LTC4218
Hot Swap Controller
Features Description
n
Wide Operating Voltage Range: 2.9V to 26.5V The LTC 4218 is a Hot Swap controller that allows a board
n
Adjustable, 5% Accurate 15mV Current Limit to be safely inserted and removed from a live backplane.
n
Current Monitor Output An internal high side switch driver controls the gate of an
n
Adjustable Current Limit Timer Before Fault external N-channel MOSFET for supply voltages from 2.9V
n
Power Good and Fault Outputs to 26.5V. A dedicated 12V version (LTC4218-12) contains
n
Adjustable Inrush Current Control preset 12V specific thresholds, while the standard LTC4218
n
2% Accurate Undervoltage and Overvoltage allows adjustable thresholds.
Protection
The LTC4218 provides an accurate (5%) current limit with
n
Available in 16-Lead SSOP and 16-Pin 5mm 3mm
current foldback limiting. The current limit threshold can
DFN Packages
be adjusted dynamically using an external pin. Additional
features include a current monitor output that amplifies
the sense voltage for ground referenced current sensing.
a
Overvoltage, undervoltage and power good monitoring
n
RAID Systems
are also provided.
n
ATCA, AMC, TCA Systems
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
n Technology Corporation. All other trademarks are the property of their respective owners.
Server I/O Cards
n
Industrial
t ypical a
12V, 6A Card Resident Application Power-Up Waveform
V
2m Si7108DN OUT
12V 12V
V
IN CONTACT BOUNCE
6A
+
10V/DIV
*
330F
10
I
IN
1A/DIV
SENSE GATE SOURCE
1k V
OUT
10V/DIV
+
SENSE
0.01F
V
DD
PG
OV
LTC4218DHC-12 10k 10V/DIV
UV
AUTO
RETRY PG
FLT
4218 TA01b
25ms/DIV
I
TIMER SET
0.1F INTV I
ADC
CC MON
20k
GND
1F
2V = 7.5A
4218 TA01a
*TVS: DIODES INC SMAJ17A
4218fh
1
For more information www.linear.com/LTC4218
pplication
pplicationsLTC4218
a bsolute Maxi Mu M r (Notes 1, 2)
Supply Voltage (V ) ................................. 0.3V to 35V Operating Ambient Temperature Range
DD
Input Voltages LTC4218C ................................................ 0C to 70C
FB, OV, UV ............................................. 0.3V to 12V LTC4218I .............................................40C to 85C
TIMER ................................................... 0.3V to 3.5V Storage Temperature Range ..................65C to 150C
SENSE .............................V 10V or 0.3V to V Lead Temperature (Soldering, 10 sec)
DD DD
+
SENSE .............................V 10V or 0.3V to V GN Package Only ..............................................300C
DD DD
SOURCE ........................................ 5V to V + 0.3V
DD
Output Voltages
I , I ................................................. 0.3V to 3V
SET MON
PG, FLT .................................................. 0.3V to 35V
INTV .................................................. 0.3V to 3.5V
CC
GATE (Note 3) ........................................ 0.3V to 35V
p in c F
TOP VIEW
TOP VIEW
+
NC 1 16 SENSE +
NC 1 16 SENSE
V 2 15 SENSE
DD
V 2 15 SENSE
DD
UV 3 14 I
SET
UV 3 14 I
SET
OV 4 13 I
MON
OV 4 13 I
MON
17
TIMER 5 12 FB
TIMER 5 12 FB
INTV 6 11 FLT
CC
INTV 6 11 FLT
CC
GND 7 10 PG
GND 7 10 PG
SOURCE 8 9 GATE
SOURCE 8 9 GATE
DHC PACKAGE
GN PACKAGE
16-LEAD (5mm 3mm) PLASTIC DFN
16-LEAD PLASTIC SSOP
T = 125C, = 43C/W
JMAX JA
T = 150C, = 135C/W
JMAX JA
EXPOSED PAD (PIN 17) IS SUBSTRATE GND
o r Der i n F M
(