LTC4211 LINER [Linear Technology], LTC4211 Datasheet
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LTC4211
Manufacturer Part Number
LTC4211
Description
Hot Swap Controller with Multifunction Current Control
Manufacturer
LINER [Linear Technology]
Datasheet
1.LTC4211.pdf
(36 pages)
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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
GND
V
5V
CC
Allows Safe Board Insertion and Removal
from a Live Backplane
Controls Supply Voltages from 2.5V to 16.5V
Programmable Soft-Start with Inrush Current
Limiting, No External Gate Capacitor Required
Faster Turn-Off Time Because No External Gate
Capacitor is Required
Dual Level Overcurrent Fault Protection
Programmable Response Time for Overcurrent
Protection (MS)
Programmable Overvoltage Protection (MS)
Automatic Retry or Latched Mode Operation (MS)
High Side Drive for an External N-Channel FET
User-Programmable Supply Voltage Power-Up Rate
FB Pin Monitors V
Glitch Filter Protects Against Spurious RESET Signal
Electronic Circuit Breaker
Hot Board Insertion and Removal (Either On
Backplane or On Removable Card)
Industrial High Side Switch/Circuit Breaker
CONNECTOR
BACKPLANE
(FEMALE)
CONNECTOR
PCB EDGE
(MALE)
U
OUT
LONG
SHORT
LONG
Z1 = 1SMA10A OR SMAJ10A
* OPTIONAL
Single Channel 5V Hot Swap Controller
PCB CONNECTION SENSE
and Signals RESET
Z1*
20k
R1
R
10
R2
10k
X
C
100nF
X
U
2
ON
V
CC
TIMER
8
0.007
R
SENSE
3
SENSE
LTC4211
C
10nF
TIMER
7
GND
Si4410DY
4
GATE
M1
RESET
6
FB
Multifunction Current Control
5
1
R3
36k
R4
15k
+
DESCRIPTIO
The LTC
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 V
programmed by an external filter capacitor, MS only). The
fast comparator trips at V
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.
Hot Swap is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
C
LOAD
Hot Swap Controller with
R5
10k
®
RESET
4211 is a Hot Swap
LOGIC
4211 TA01A
P
V
5V
5A
GND
OUT
CC
U
– 50mV and activates in 20 s (or
V
V
5V/DIV
5V/DIV
1V/DIV
1V/DIV
V
RESET
TIMER
GATE
V
ON
NO C
CC
LOAD
TM
Power-Up Sequence
– 150mV and typically
controller that allows a
2.5ms/DIV
LTC4211
4211 TA01b
1
4211f