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LTC4230CGN

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1
LTC4230
4230f
■
Allows Safe Board Insertion and Removal
from a Live Backplane
■
Controls Three Supply Voltages from 1.7V to 16.5V
with V
CC1
≥ V
CC2
≥ 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
■
FB
n
Pin Monitors V
OUT
n
and Signals RESET
n
■
Glitch Filter Eliminates Spurious RESET
n
Signals
The LTC
®
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
CC
n
– 50mV and activate in 10µs or are programmed by
an external filter capacitor. The fast comparators trip at
V
CC
n
– 150mV and typically respond in 500ns.
Each FB
n
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.
■
Electronic Circuit Breaker
■
Hot Board Insertion and Removal (Either On
Backplane or On Removable Card)
■
Industrial High Side Switch/Circuit Breaker
Triple Hot Swap Controller
with Multifunction Current Control
, LTC and LT are registered trademarks of Linear Technology Corporation.
3-Channel Hot Swap Controller
Hot Swap is a trademark of Linear Technology Corporation.
R
SENSE2
0.007Ω
CX2
100nF
CX1
100nF
RX2
10Ω
Q2
IRF7413
V
CC1
ON
FAULT
GND
LTC4230
15
67 8161718543
FB3
1
13
14
12
11
SENSE 1 GATE 1 V
CC2
SENSE 2 GATE 2 SENSE 3 GATE 3V
CC3
RESET 3
2
R
SENSE3
0.007Ω
RX1
10Ω
R8
5.1k
R9
12k
Q3
IRF7413
V
OUT1
3.3V
5A
V
OUT2
2.5V
5A
V
OUT3
1.8V
5A
R
SENSE1
0.007Ω
CX3
100nF
RX3
10Ω
C
TIMER
*
0.1µF
C
FILTER
**
15pF
Q1
IRF7413
Z3***
Z2***
Z1***
* SYSTEM ON TIME: 6.2ms
**CIRCUIT BREAKER RESPONSE TIME: 19.5µs
***OPTIONAL
Z1, Z2, Z3: SMAJ10
RESET 2
19
FB2
20
R7
10k
RESET 1
9
FB1
10
R10
11k
R11
12k
R6
10k
R12
18k
R13
12k
4230 TA01
R5
10k
PCB EDGE
CONNECTOR
(MALE)
BACKPLANE
CONNECTOR
(FEMALE)
V
CC1
3.3V
LONG
V
CC2
2.5V
LONG
V
CC3
1.8V
LONG
SHORT
FAULT
GND
LONG
SHORT
R2
10k
R1
10k
PCB CONNECTION SENSE
RESET 3
TIMER
FILTER
RESET 2
RESET 1
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
2
LTC4230
4230f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage (V
CC1
) ● 2.700 16.5 V
Supply Voltage (V
CC2
)V
CC2
≤ V
CC1
● 2.375 16.5 V
Supply Voltage (V
CC3
)V
CC3
≤ (V
CC1
– 1V) ● 1.700 15.5 V
I
CC
Supply Current (I
CC1
) ON = V
CC1
, FB1 = High ● 1.8 3 mA
Supply Current (I
CC2
) ON = V
CC1
, FB2 = High ● 75 150 µA
Supply Current (I
CC3
) ON = V
CC1
, FB3 = High ● 65 150 µA
V
LKO1
Undervoltage Lockout , Channel 1 V
CC1
Low to High Transition ● 2.15 2.35 2.52 V
V
LKO2
Undervoltage Lockout , Channel 2 V
CC2
Low to High Transition ● 1.98 2.15 2.32 V
V
LKO3
Undervoltage Lockout , Channel 3 V
CC3
Low to High Transition ● 1.09 1.19 1.29 V
V
LKOHST1
Undervoltage Lockout Hysteresis, Channel 1 100 mV
V
LKOHST2
Undervoltage Lockout Hysteresis, Channel 2 45 mV
V
LKOHST3
Undervoltage Lockout Hysteresis, Channel 3 35 mV
I
IN, FB
n
FB
n
Pin Input Current 0V ≤ V
FB
n
≤ V
CC
n
● ±0.1 ±10 µA
I
IN, ON
ON Pin Input Current 0V ≤ V
ON
≤ V
CC1
● ±0.1 ±10 µA
I
IN, SENSE
n
Input Current for SENSE
n
0V ≤ V
SENSE
n
≤ V
CC
n
● ±0.1 ±15 µA
V
CB(FAST)
Circuit Breaker
n
Trip Voltage Fast Comparator ● 135 150 165 mV
V
CB(SLOW)
Slow Comparator ● 40 50 60 mV
I
GATE
n
, UP
GATE
n
Pull-Up Current Charge Pump On, 0 ≤ V
GATE
n
< 0.2V ● –12.5 –10 –6.5 µA
I
GATE
n
, DN
Normal GATE
n
Pull-Down Current ON Low, V
GATE
n
= 5V 200 µA
Fast GATE
n
Pull-Down Curent FAULT Latched and Circuit Breaker 16 mA
Tripped or in UVLO, V
GATE
n
= 5V
I
LEAK
RESET
n
Leakage Current V
RESET
n
= 15V, Pull-Down Device Off ● ±0.1 ±2.5 µA
T
JMAX
= 125°C, θ
JA
= 95°C/ W
ORDER PART
NUMBER
Supply Voltage (V
CC
n
) ............................................. 17V
SENSE
n
Pins ............................... –0.3V to (V
CC
+ 0.3V)
FB
n
, ON Pins ............................... –0.3V to (V
CC
+ 0.3V)
TIMER Pin ...................................................–0.3V to 2V
GATE
n
Pins........................... Internally Limited (Note 3)
RESET
n
, 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
LTC4230CGN
LTC4230IGN
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
(Note 1)
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
CC1
= 3.3V, V
CC2
= 2.5V,V
CC3
= 1.8V unless otherwise noted. (Note 2)
ELECTRICAL CHARACTERISTICS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
1
2
3
4
5
6
7
8
9
10
TOP VIEW
GN PACKAGE
20-LEAD PLASTIC SSOP
20
19
18
17
16
15
14
13
12
11
FB3
RESET 3
GATE 3
SENSE 3
V
CC3
V
CC1
SENSE 1
GATE 1
RESET 1
FB1
FB2
RESET 2
GATE 2
SENSE 2
V
CC2
ON
GND
FAULT
TIMER
FILTER
3
LTC4230
4230f
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
CC1
= 3.3V, V
CC2
= 2.5V,V
CC3
= 1.8V unless otherwise noted. (Note 2)
ELECTRICAL CHARACTERISTICS
∆V
GATE
n
External N-Channel Gate Drive V
GATE1, 2
– V
CC1, 2
(for V
CC1, 2
= 2.7V, V
CC3
= V
CC1
– 1V) ● 4.5 8 V
V
GATE3
– V
CC3
(for V
CC1, 2
= 2.7V, V
CC3
= V
CC1
– 1V) ● 5.5 9 V
V
GATE1, 2
– V
CC1, 2
(for V
CC1, 2
= 3.3V, V
CC3
= V
CC1
– 1V) ● 510V
V
GATE3
– V
CC3
(for V
CC1, 2
= 3.3V, V
CC3
= V
CC1
– 1V) ● 611V
V
GATE
n
– V
CC
n
(for V
CC1, 2
= 5V, V
CC3
= V
CC1
– 1V) ● 916V
V
GATE
n
– V
CC
n
(for V
CC1, 2
= 12V or 15V, ● 718V
V
CC3
= V
CC1
– 1V)
V
GATE
n
, 0V
GATE
n
Overvoltage Lockout 0.25 V
Threshold
V
FB
n
FB
n
Low Threshold Voltage FB
n
High to Low Transition ● 1.209 1.234 1.259 V
∆V
FB
n
FB
n
Line Regulation 2.7V ≤ V
CC1
≤ 16.5V 0.5 mV
V
FB
n
, HST
FB
n
Hysteresis 3mV
V
ONHI
ON High Threshold Voltage ON Low to High Transition ● 1.250 1.314 1.380 V
V
ONLO
ON Low Threshold Voltage ON High to Low Transition ● 1.172 1.234 1.270 V
V
ONHST
ON Hysteresis 80 mV
I
FILTER
FILTER Pull-Up Current During Slow Fault Condition ● –2.5 –2 –1.3 µA
FILTER Pull-Down Current During Normal and Reset Conditions
● 71013 µA
V
FILTER
FILTER Threshold Latched Off Threshold, FILTER Low to High ● 1.10 1.26 1.42 V
V
FILTERHST
FILTER Threshold Hysteresis –70 mV
I
TMR
TIMER Pull-Up Current TIMER On ● –23 –20 –17 µA
TIMER Pull-Down Current TIMER Off, V
FAULT
= Low ● 0.9 1.6 2.3 µA
V
TIMER
= 1.5V 2.5 mA
V
TMR
TIMER Threshold TIMER Low to High ● 1.172 1.234 1.27 V
TIMER High to Low
● 0.3 0.5 V
V
FAULT
FAULT Low Threshold Voltage FAULT High to Low ● 1.172 1.234 1.27 V
V
FAULT, HST
FAULT Hysteresis FAULT Low to High 50 mV
I
FAULT, UP
FAULT Pull-Up Current ● –2.5 –2 –1.5 µA
V
OLFAULT
Output Low Voltage I
FAULT
= 1.6mA, V
CC1
= 5V ● 0.19 0.4 V
V
OLRESET
n
Output Low Voltage I
RESET
n
= 1.6mA, V
CC1
= 5V ● 0.19 0.4 V
t
GATEFC
Fast COMP
n
Trip to V
CB
= 0mV to 200mV Step ● 0.5 1 µs
GATE
n
Discharging
t
FAULTSC
Slow Comparator Trip to V
CB
= 0mV to 100mV Step, FILTER Floating 10 µs
FILTER High and FAULT Latched 10nF at FILTER Pin to GND ● 712 ms
t
OVPFTR
FILTER Comparator Trip to V
FILTER
= 0V to 5V ● 812 µs
GATE
n
Discharging
t
EXTFAULT
FAULT Low to GATE Discharging V
FAULT
= 5V to 0V ● 1.5 3 4.5 µs
t
RESET
Circuit Breaker Reset Time ON Held Low to Guarantee FAULT High ● 15 30 µs
t
OFF
Turn-Off Time ON Goes Low to GATE
n
Off 8 µs
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All current into device pins is positive; all current out of device
pins is negative; all voltages are referenced to ground unless otherwise
specified.
Note 3: An internal zener at the GATE
n
pin clamps the charge pump
voltage to a typical maximum operating voltage of 26V. External overdrive
of the GATE
n
pin beyond the internal zener voltage may damage the part.
The GATE
n
capacitance must be <0.15µF at maximum V
CC
. If a lower
GATE
n
pin voltage is desired, use an external zener diode.
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LTC4230CGN

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Buy LTC4230CGN
Manufacturer:
Analog Devices / Linear Technology
Description:
Hot Swap Voltage Controllers LTC4230 - Triple Hot Swap Controller with Multifunction Current Control
Lifecycle:
New from this manufacturer.
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