LTC4210-3_15 Datasheet, PDF (1/16 Pages) Linear Technology – Hot Swap Controller in 6-Lead SOT-23 Package

LTC4210-3/LTC4210-4
Hot Swap Controller in
6-Lead SOT-23 Package
FEATURES
■ _{Allows Safe Board Insertion and Removal}
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}
■ _{Controls Supply Voltages from 2.7V to 7V}
■ _{Undervoltage Lockout}
■ _{Adjustable Overvoltage Protection}
■ _{Low Profile (1mm) SOT-23 (ThinSOT}^TM_{) Package}
U
APPLICATIO S
■ _{Hot Board Insertion}
■ _{Electronic Circuit Breaker}
■ _{Industrial High Side Switch/Circuit Breaker}
DESCRIPTIO
The LTC^®4210-3/LTC4210-4 is a 6-pin SOT-23 Hot Swap^TM
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 a supply voltage ranging from 2.7V to 7V. The
LTC4210 provides the initial timing cycle and allows the
GATE to be ramped up at an adjustable rate.
The LTC4210 features a fast current limit loop providing
active current limiting together with a circuit breaker
timer. The signal at the ON pin turns the part on and off and
is also used for the reset function.
The LTC4210-3 retries on overcurrent fault and the
LTC4210-4 latches off on an overcurrent fault.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
ThinSOT and Hot Swap are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Single Channel 5V Hot Swap Controller
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE) (MALE)
V_IN
LONG
5V
Z1
10Ω
OPTIONAL
0.1µF
R_SENSE
0.01Ω
Q1
Si4410DY
+
V_OUT
5V
4A
470µF
V_CC SENSE
GATE
100Ω
SHORT ^20k
ON LTC4210-3
100Ω
10k
TIMER
GND
0.01µF
0.22µF
LONG
GND
GND
Z1: ISMA10A OR SMAJ10A
4210 TA01
Power-Up Sequence
C_LOAD = 470µF
V_ON
(2V/DIV)
V_TIMER
(1V/DIV)
V_OUT
(5V/DIV)
10ms/DIV
I_OUT
(0.5A/DIV)
4210 TA02
421034fa
1