LTC4210-1/LTC4210-2
Hot Swap Controller in
6-Lead SOT-23 Package
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FEATURES
DESCRIPTIO
■
Allows Safe Board Insertion and Removal
The LTC®4210 is a 6-pin SOT-23 Hot SwapTM controller
thatallowsaboardtobesafelyinsertedandremovedfrom
a live backplane. An internal high side switch driver
controls the GATE of an external N-channel MOSFET for a
supply voltage ranging from 2.7V to 16.5V. The LTC4210
provides the initial timing cycle and allows the GATE to be
ramped up at an adjustable rate.
from a Live Backplane
■
Adjustable Analog Current Limit
with Circuit Breaker
■
Fast Response Limits Peak Fault Current
■
Automatic Retry or Latch Off On Current Fault
■
Adjustable Supply Voltage Power-Up Rate
■
High Side Drive for External MOSFET Switch
The LTC4210 features a fast current limit loop providing
active current limiting together with a circuit breaker
timer. ThesignalattheONpinturnsthepartonandoffand
is also used for the reset function.
■
Controls Supply Voltages from 2.7V to 16.5V
■
Undervoltage Lockout
■
Adjustable Overvoltage Protection
Low Profile (1mm) SOT-23 (ThinSOTTM) Package
■
This part is available in two options: the LTC4210-1 for
automatic retry on overcurrent fault and the LTC4210-2
for latch off on an overcurrent fault.
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APPLICATIO S
■
Hot Board Insertion
■
Electronic Circuit Breaker
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT and Hot Swap are trademarks of Linear Technology Corporation.
■
Industrial High Side Switch/Circuit Breaker
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TYPICAL APPLICATIO
Single Channel 5V Hot Swap Controller
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE)
(MALE)
R
Q1
Power-Up Sequence
SENSE
0.01Ω
V
5V
4A
Si4410DY
OUT
LONG
V
IN
C
= 470µF
5V
LOAD
+
R
470µF
LOAD
X
V
ON
Z1
10Ω
C
(2V/DIV)
OPTIONAL
C
X
0.1µF
R
G
V
TIMER
100Ω
V
SENSE
GATE
CC
(1V/DIV)
R
ON1
20k
R
C
SHORT
LONG
LTC4210
100Ω
ON
C
V
OUT
(5V/DIV)
C
R
ON2
10k
0.01µF
TIMER
GND
C
TIMER
0.22µF
I
OUT
(0.5A/DIV)
GND
GND
4210 TA01
Z1: ISMA10A OR SMAJ10A
4210 TA02
10ms/DIV
421012f
1