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Linear Technology Electronic Components Datasheet

LTC4230IGN Datasheet

Triple Hot Swap Controller

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LTC4230
Triple Hot Swap Controller
with Multifunction Current Control
FEATURES
DESCRIPTIO
s Allows Safe Board Insertion and Removal
from a Live Backplane
s Controls Three Supply Voltages from 1.7V to 16.5V
with VCC1 VCC2 VCC3
s Programmable Soft-Start with Inrush Current
Limiting, No External Gate Capacitor Required
s Faster Turn-Off Time with No Gate Capacitor
s Dual Level Overcurrent Fault Protection
s Programmable Overcurrent Response Time
s Programmable Overvoltage Protection
s Automatic Retry or Latched Mode Operation
s Independent N-Channel FET High Side Drivers
s User-Programmable Supply Voltage Power-Up Rate
s FBn Pin Monitors VOUTn and Signals RESETn
s Glitch Filter Eliminates Spurious RESETn Signals
U
APPLICATIO S
s Electronic Circuit Breaker
s Hot Board Insertion and Removal (Either On
Backplane or On Removable Card)
s Industrial High Side Switch/Circuit Breaker
The LTC®4230 is a 3-channel Hot SwapTM 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
VCCn – 50mV and activate in 10µs or are programmed by
an external filter capacitor. The fast comparators trip at
VCCn – 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’
functionality.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
VCC1
3.3V
(FEMALE)
(MALE)
LONG
VCC2
2.5V
LONG
VCC3
1.8V
LONG
Z1***
RX1
10
CX1
100nF
3-Channel Hot Swap Controller
RSENSE1
0.007
Q1
IRF7413
RSENSE2
0.007
Q2
IRF7413
RSENSE3
0.007
Q3
IRF7413
Z2***
RX3
10
RX2
10
Z3***
CX3
100nF
CX2
100nF
6
VCC1
7
8
SENSE 1 GATE 1
16
17
VCC2 SENSE 2
18 5
GATE 2 VCC3
4
3
SENSE 3 GATE 3
1
FB3
R8
5.1k
R7
R9 10k
12k
FAULT
GND
PCB CONNECTION SENSE
SHORT
R1 R2
10k 10k
SHORT
LONG
* SYSTEM ON TIME: 6.2ms
**CIRCUIT BREAKER RESPONSE TIME: 19.5µs
***OPTIONAL
Z1, Z2, Z3: SMAJ10
CTIMER*
0.1µF
CFILTER**
15pF
15
ON
13
FAULT
14
GND
12
TIMER
11
FILTER
LTC4230
2
RESET 3
R10
20
11k
FB2
R11
12k
19
RESET 2
9
RESET 1
10
FB1
VOUT1
3.3V
5A
VOUT2
2.5V
5A
VOUT3
1.8V
5A
RESET 3
R6
R5
10k
10k
RESET 2
RESET 1
R12
18k
R13
12k
4230 TA01
4230f
1


Linear Technology Electronic Components Datasheet

LTC4230IGN Datasheet

Triple Hot Swap Controller

No Preview Available !

LTC4230 www.DataSheet4U.com
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (VCCn) ............................................. 17V
SENSEn Pins ............................... – 0.3V to (VCC + 0.3V)
FBn, ON Pins ............................... – 0.3V to (VCC + 0.3V)
TIMER Pin ...................................................– 0.3V to 2V
GATEn Pins ........................... Internally Limited (Note 3)
RESETn, FAULT, FILTER Pins ....................– 0.3V to 17V
Operating Temperature Range
LTC4230C ............................................... 0°C to 70°C
LTC4230I ............................................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
FB3 1
RESET 3 2
GATE 3 3
SENSE 3 4
VCC3 5
VCC1 6
SENSE 1 7
GATE 1 8
RESET 1 9
FB1 10
20 FB2
19 RESET 2
18 GATE 2
17 SENSE 2
16 VCC2
15 ON
14 GND
13 FAULT
12 TIMER
11 FILTER
ORDER PART
NUMBER
LTC4230CGN
LTC4230IGN
GN PACKAGE
20-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VCC1 = 3.3V, VCC2 = 2.5V,VCC3 = 1.8V unless otherwise noted. (Note 2)
SYMBOL
VCC
ICC
VLKO1
VLKO2
VLKO3
VLKOHST1
VLKOHST2
VLKOHST3
IIN, FBn
IIN, ON
IIN, SENSEn
VCB(FAST)
VCB(SLOW)
IGATEn, UP
IGATEn, DN
ILEAK
PARAMETER
Supply Voltage (VCC1)
Supply Voltage (VCC2)
Supply Voltage (VCC3)
Supply Current (ICC1)
Supply Current (ICC2)
Supply Current (ICC3)
Undervoltage Lockout , Channel 1
Undervoltage Lockout , Channel 2
Undervoltage Lockout , Channel 3
Undervoltage Lockout Hysteresis, Channel 1
Undervoltage Lockout Hysteresis, Channel 2
Undervoltage Lockout Hysteresis, Channel 3
FBn Pin Input Current
ON Pin Input Current
Input Current for SENSEn
Circuit Breakern Trip Voltage
GATEn Pull-Up Current
Normal GATEn Pull-Down Current
Fast GATEn Pull-Down Curent
RESETn Leakage Current
CONDITIONS
VCC2 VCC1
VCC3 (VCC1 – 1V)
ON = VCC1, FB1 = High
ON = VCC1, FB2 = High
ON = VCC1, FB3 = High
VCC1 Low to High Transition
VCC2 Low to High Transition
VCC3 Low to High Transition
0V VFBn VCCn
0V VON VCC1
0V VSENSEn VCCn
Fast Comparator
Slow Comparator
Charge Pump On, 0 VGATEn < 0.2V
ON Low, VGATEn = 5V
FAULT Latched and Circuit Breaker
Tripped or in UVLO, VGATEn = 5V
VRESETn = 15V, Pull-Down Device Off
MIN TYP
q 2.700
q 2.375
q 1.700
q
1.8
q
75
q
65
q 2.15 2.35
q 1.98 2.15
q 1.09 1.19
100
45
35
q
± 0.1
q
± 0.1
q
± 0.1
q 135
150
q 40
50
q –12.5 –10
200
16
MAX UNITS
16.5
V
16.5
V
15.5
V
3
mA
150
µA
150
µA
2.52
V
2.32
V
1.29
V
mV
mV
mV
± 10
µA
± 10
µA
± 15
µA
165
mV
60
mV
– 6.5
µA
µA
mA
q
±0.1 ±2.5
µA
4230f
2


Part Number LTC4230IGN
Description Triple Hot Swap Controller
Maker Linear
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