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LTC4230 Datasheet

  • LTC4230

  • Triple Hot Swap Controller with Multifunction Current Contro...

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FEATURES
s
s
LTC4230
Triple Hot Swap Controller
with Multifunction Current Control
DESCRIPTIO
The LTC
廬
4230 is a 3-channel Hot Swap
TM
controller that
allows a board to be safely inserted and removed from a
live backplane. Internal high side switch drivers control
the gates of external N-channel MOSFETs for supply
voltages ranging from 1.7V to 16.5V. The LTC4230 pro-
vides soft-start and inrush current limiting during the
programmable start-up period.
On-chip current limit comparators provide dual level
circuit breaker protection. The slow comparators trip at
V
CCn
鈥?50mV and activate in 10碌s or are programmed by
an external filter capacitor. The fast comparators trip at
V
CCn
鈥?150mV and typically respond in 500ns.
Each FBn pin monitors its own output supply voltage and
signals its RESET pin. The ON pin turns the chip on and
off and can be used for a reset function. The LTC4230 also
provides additional functions including fault indication,
autoretry or latchoff modes, programmable current limit
response time based on the FAULT and FILTER pins鈥?/div>
functionality.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
s
s
s
s
s
s
s
s
s
s
Allows Safe Board Insertion and Removal
from a Live Backplane
Controls Three Supply Voltages from 1.7V to 16.5V
with V
CC1
鈮?/div>
V
CC2
鈮?/div>
V
CC3
Programmable Soft-Start with Inrush Current
Limiting, No External Gate Capacitor Required
Faster Turn-Off Time with No Gate Capacitor
Dual Level Overcurrent Fault Protection
Programmable Overcurrent Response Time
Programmable Overvoltage Protection
Automatic Retry or Latched Mode Operation
Independent N-Channel FET High Side Drivers
User-Programmable Supply Voltage Power-Up Rate
FBn Pin Monitors V
OUTn
and Signals RESETn
Glitch Filter Eliminates Spurious RESETn Signals
APPLICATIO S
s
s
s
Electronic Circuit Breaker
Hot Board Insertion and Removal (Either On
Backplane or On Removable Card)
Industrial High Side Switch/Circuit Breaker
TYPICAL APPLICATIO
BACKPLANE
CONNECTOR
(FEMALE)
V
CC1
3.3V
V
CC2
2.5V
V
CC3
1.8V
PCB EDGE
CONNECTOR
(MALE)
LONG
LONG
LONG
Z1***
3-Channel Hot Swap Controller
R
SENSE1
0.007鈩?/div>
Q1
IRF7413
R
SENSE2
0.007鈩?/div>
Q2
IRF7413
R
SENSE3
0.007鈩?/div>
RX2
10鈩?/div>
Q3
IRF7413
V
OUT1
3.3V
5A
V
OUT2
2.5V
5A
V
OUT3
1.8V
5A
R8
5.1k
R9
12k
RESET 3
2
R10
11k
R11
12k
RESET 2
GND
RESET 1
TIMER
FILTER
FB1
10
19
9
R12
18k
R13
12k
4230 TA01
RX1
10鈩?/div>
CX1
100nF
RX3
10鈩?/div>
CX3
100nF
Z3***
CX2
100nF
Z2***
6
V
CC1
7
SENSE 1
8
GATE 1
16
V
CC2
17
SENSE 2
18
5
GATE 2 V
CC3
SENSE 3 GATE 3
FB3
1
PCB CONNECTION SENSE
SHORT
R1
10k
R2
10k
15
FAULT
GND
SHORT
LONG
13
14
12
11
* SYSTEM ON TIME: 6.2ms
**CIRCUIT BREAKER RESPONSE TIME: 19.5碌s
***OPTIONAL
Z1, Z2, Z3: SMAJ10
C
TIMER
*
0.1碌F
C
FILTER
**
15pF
LTC4230
ON
FAULT
U
U
U
4
3
R7
10k
RESET 3
FB2
20
R6
10k
R5
10k
RESET 2
RESET 1
4230f
1

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