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LTC4211IS8 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4211IS8
Description  Hot Swap Controller with Multifunction Current Control
Download  36 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4211IS8 Datasheet(HTML) 1 Page - Linear Technology

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1
LTC4211
4211f
APPLICATIO S
DESCRIPTIO
TYPICAL APPLICATIO
FEATURES
s
Allows Safe Board Insertion and Removal
from a Live Backplane
s
Controls Supply Voltages from 2.5V to 16.5V
s
Programmable Soft-Start with Inrush Current
Limiting, No External Gate Capacitor Required
s
Faster Turn-Off Time Because No External Gate
Capacitor is Required
s
Dual Level Overcurrent Fault Protection
s
Programmable Response Time for Overcurrent
Protection (MS)
s
Programmable Overvoltage Protection (MS)
s
Automatic Retry or Latched Mode Operation (MS)
s
High Side Drive for an External N-Channel FET
s
User-Programmable Supply Voltage Power-Up Rate
s
FB Pin Monitors VOUT and Signals RESET
s
Glitch Filter Protects Against Spurious RESET Signal
The LTC
®4211 is a Hot SwapTM 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
ranging from 2.5V to 16.5V. The LTC4211 provides soft-
start and inrush current limiting during the start-up period
which has a programmable duration.
Two on-chip current limit comparators provide dual level
overcurrent circuit breaker protection. The slow com-
parator trips at VCC – 50mV and activates in 20µs (or
programmed by an external filter capacitor, MS only). The
fast comparator trips at VCC – 150mV and typically
responds in 300ns.
The FB pin monitors the output supply voltage and signals
the RESET output pin. The ON pin signal turns the chip on
and off and can also be used for the reset function. The
MS package has FAULT and FILTER pins to provide
additional functions like fault indication, autoretry or
latch-off modes, programmable current limit response
time and programmable overvoltage protection using an
external Zener diode clamp.
s
Electronic Circuit Breaker
s
Hot Board Insertion and Removal (Either On
Backplane or On Removable Card)
s
Industrial High Side Switch/Circuit Breaker
Hot Swap Controller with
Multifunction Current Control
, LTC and LT are registered trademarks of Linear Technology Corporation.
Single Channel 5V Hot Swap Controller
+
VCC
SENSE
LTC4211
8
2
34
76
CLOAD
VOUT
5V
5A
GND
4211 TA01A
5
1
R4
15k
GATE
GND
TIMER
PCB CONNECTION SENSE
CTIMER
10nF
FB
ON
SHORT
LONG
VCC
5V
GND
LONG
Z1 = 1SMA10A OR SMAJ10A
* OPTIONAL
RESET
R2
10k
R1
20k
RX
10
RSENSE
0.007
PCB EDGE
CONNECTOR
(MALE)
M1
Si4410DY
Z1*
R3
36k
R5
10k
µP
LOGIC
RESET
CX
100nF
BACKPLANE
CONNECTOR
(FEMALE)
Hot Swap is a trademark of Linear Technology Corporation.
4211 TA01b
2.5ms/DIV
NO CLOAD
VGATE
5V/DIV
VRESET
5V/DIV
VON
1V/DIV
VTIMER
1V/DIV
Power-Up Sequence


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