LTC4211
Hot Swap Controller with
Multifunction Current Control
FEATURES
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DESCRIPTION
The
LTC
®
4211
is a hot swap 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 supply voltages ranging
from 2.5V to 16.5V. The LTC4211 provides soft-start and
inrush current limiting during the start-up period which
has a programmable duration.
Two on-chip current limit comparators provide dual level
overcurrent circuit breaker protection. The slow com-
parator trips at V
CC
– 50mV and activates in 20µs (or is
programmed by an external filter capacitor, MS only).
The fast comparator trips at V
CC
– 150mV and typically
responds in 300ns.
The FB pin monitors the output supply voltage and signals
the
RESET
output pin. The ON pin signal turns the chip on
and off and can also be used for the reset function. The
MS package has
FAULT
and FILTER pins to provide addi-
tional functions like fault indication, autoretry or latch-off
modes, programmable current limit response time and
programmable overvoltage protection using an external
Zener diode clamp.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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Allows Safe Board Insertion and Removal
from a Live Backplane
Controls Supply Voltages from 2.5V to 16.5V
Programmable Soft-Start with Inrush Current
Limiting, No External Gate Capacitor Required
Faster Turn-Off Time Because No External Gate
Capacitor is Required
Dual Level Overcurrent Fault Protection
Programmable Response Time for Overcurrent
Protection (MS)
Programmable Overvoltage Protection (MS)
Automatic Retry or Latched Mode Operation (MS)
High Side Drive for an External N-Channel FET
User-Programmable Supply Voltage Power-Up Rate
FB Pin Monitors V
OUT
and Signals
RESET
Glitch Filter Protects Against Spurious
RESET
Signal
APPLICATIONS
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Electronic Circuit Breaker
Hot Board Insertion and Removal (Either On
Backplane or On Removable Card)
Industrial High Side Switch/Circuit Breaker
TYPICAL APPLICATION
Single Channel 5V Hot Swap Controller
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE)
(MALE)
V
CC
5V
LONG
Z1*
R
X
10
C
X
100nF
R
SENSE
0.007
M1
Si4410DY
Power-Up Sequence
NO C
LOAD
+
8
V
CC
7
SENSE
6
GATE
FB
5
R3
36k
R4
15k
RESET
TIMER
GND
C
TIMER
10nF
4
3
1
C
LOAD
R5
10k
µP
LOGIC
RESET
V
OUT
5V
5A
V
GATE
5V/DIV
V
RESET
5V/DIV
SHORT
R1
20k
R2
10k
2
ON
LTC4211
V
ON
1V/DIV
V
TIMER
1V/DIV
2.5ms/DIV
4211 TA01b
GND
PCB CONNECTION SENSE
LONG
Z1 = 1SMA10A OR SMAJ10A
* OPTIONAL
GND
4211 TA01A
4211fc
For more information
www.linear.com/LTC4211
1
LTC4211
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (V
CC
) ................................................17V
Input Voltage
FB, ON .................................................. – 0.3V to 17V
SENSE, FILTER ........................... –0.3V to V
CC
+ 0.3V
TIMER ...................................................... –0.3V to 2V
Output Voltage
GATE ................................. Internally Limited (Note 3)
RESET, FAULT
....................................... –0.3V to 17V
Operating Temperature Range
LTC4211C................................................ 0°C to 70°C
LTC4211I ............................................. – 40°C to 85°C
Storage Temperature Range ..................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
PIN CONFIGURATION
TOP VIEW
RESET
1
ON 2
TIMER 3
GND 4
8
7
6
5
V
CC
SENSE
GATE
FB
RESET
ON
TIMER
GND
1
2
3
4
TOP VIEW
8
7
6
5
V
CC
SENSE
GATE
FB
RESET
ON
FILTER
TIMER
GND
1
2
3
4
5
TOP VIEW
10
9
8
7
6
FAULT
V
CC
SENSE
GATE
FB
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 150°C/W
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 200°C/W
MS PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 200°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC4211CS8#PBF
LTC4211IS8#PBF
LTC4211CMS8#PBF
LTC4211IMS8#PBF
LTC4211CMS#PBF
LTC4211IMS#PBF
TAPE AND REEL
LTC4211CS8#TRPBF
LTC4211IS8#TRPBF
LTC4211CMS8#TRPBF
LTC4211IMS8#TRPBF
LTC4211CMS#TRPBF
LTC4211IMS#TRPBF
http://www.linear.com/product/LTC4211#orderinfo
PART MARKING
4211
4211I
LTSC
LTSD
LTSU
LTSV
PACKAGE DESCRIPTION
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic MSOP
8-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise noted. (Note 2)
SYMBOL
V
CC
I
CC
V
LKO
V
LKOHST
PARAMETER
V
CC
Supply Voltage Range
V
CC
Supply Current
Internal V
CC
Undervoltage Lockout
V
CC
Undervoltage Lockout Hysteresis
FB = High, ON = High, TIMER = Low
V
CC
Low-to-High Transition
CONDITIONS
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ELECTRICAL CHARACTERISTICS
MIN
2.5
TYP
1
MAX
16.5
1.5
2.47
UNITS
V
mA
V
mV
4211fc
2.13
2.3
120
2
For more information
www.linear.com/LTC4211
LTC4211
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise noted. (Note 2)
SYMBOL
I
INFB
I
INON
I
LEAK
I
INSENSE
V
CB(FAST)
V
CB(SLOW)
I
GATEUP
I
GATEDOWN
PARAMETER
FB Input Current
ON Input Current
RESET, FAULT
Leakage Current
SENSE Input Current
SENSE Trip Voltage (V
CC
– V
SENSE
)
SENSE Trip Voltage (V
CC
– V
SENSE
)
GATE Pull-Up Current
Normal GATE Pull-Down Current
Fast GATE Pull-Down Current
∆V
GATE
External N-Channel Gate Drive
CONDITIONS
V
FB
= V
CC
or GND
V
ON
= V
CC
or GND
V
RESET
= V
FAULT
= 15V, Pull-Down Device Off
V
SENSE
= V
CC
or GND
Fast Comparator Trips
Slow Comparator Trips
Charge Pump On, V
GATE
≤ 0.2V
ON Low
FAULT
Latched and Circuit Breaker Tripped or in
UVLO
V
GATE
– V
CC
(For V
CC
= 2.5V)
V
GATE
– V
CC
(For V
CC
= 2.7V)
V
GATE
– V
CC
(For V
CC
= 3.3V)
V
GATE
– V
CC
(For V
CC
= 5V)
V
GATE
– V
CC
(For V
CC
= 12V)
V
GATE
– V
CC
(For V
CC
= 15V)
FB High to Low
2.5V ≤ V
CC
≤ 16.5V
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ELECTRICAL CHARACTERISTICS
MIN
TYP
±1
±1
±0.1
±1
MAX
±10
±10
±2.5
±10
170
60
–7.5
270
UNITS
µA
µA
µA
µA
mV
mV
µA
µA
mA
130
40
–12.5
130
150
50
– 10
200
50
2.5
4.5
5.0
10
10
8
0.08
1.223
0.2
1.236
0.5
3
1.23
1.20
–2.5
7
1.20
– 2.5
1.20
0.15
1.20
1.316
1.236
80
–2
10
1.236
80
–2
3
1.236
0.200
1.236
50
0.14
0.14
300
10
4
1
2
20
6
3
4.5
8
8
10
16
18
18
0.3
1.248
5
1.39
1.26
–1.5
13
1.26
–1.5
1.26
0.40
1.26
0.4
0.4
700
30
8
5
7
V
V
V
V
V
V
V
V
mV
mV
V
V
mV
µA
µA
V
mV
µA
mA
V
V
V
mV
V
V
ns
µs
ms
µs
µs
V
GATEOV
V
FB
∆V
FB
V
FBHST
V
ONHI
V
ONLO
V
ONHST
I
FILTER
V
FILTER
V
FILTERHST
I
TMR
V
TMR
V
FAULT
V
FAULTHST
V
OLFAULT
V
OLRESET
t
FAULTFC
t
FAULTSC
GATE Overvoltage Lockout Threshold
FB Voltage Threshold
FB Threshold Line Regulation
FB Voltage Threshold Hysteresis
ON Threshold High
ON Threshold Low
ON Hysteresis
FILTER Current
FILTER Threshold
FILTER Threshold Hysteresis
TIMER Current
TIMER Threshold
FAULT
Threshold
FAULT
Threshold Hysteresis
Output Low Voltage
Output Low Voltage
FAST COMP Trip to GATE Discharging
SLOW COMP Trip to GATE Discharging
I
FAULT
= 1.6mA
I
RESET
= 1.6mA
V
CB
= 0mV to 200mV Step
V
CB
= 0mV to 100mV Step,
8-Pin Version or FILTER Floating
V
CB
= 0mV to 100mV Step,
10nF at FILTER Pin to GND
Timer On, V
TIMER
= 1V
Timer Off, TIMER = 1.5V
TIMER Low to High
TIMER High to Low
Latched Off Threshold,
FAULT
High to Low
During Slow Fault Condition
During Normal and Reset Conditions
Latched Off Threshold, FILTER Low to High
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t
EXTFAULT
t
FILTER
FAULT
Low to GATE Discharging
FILTER High to
FAULT
Latched
V
FAULT
= 5V to 0V
V
FILTER
= 0V to 5V
4211fc
For more information
www.linear.com/LTC4211
3
LTC4211
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise noted. (Note 2)
SYMBOL
t
RESET
t
OFF
PARAMETER
Circuit Breaker Reset Delay Time
Turn-Off Time
CONDITIONS
ON Low to
FAULT
High
ON Low to GATE Off
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ELECTRICAL CHARACTERISTICS
MIN
TYP
150
8
MAX
250
UNITS
µs
µs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All current into device pins are positive; all current out of device
pins are negative; all voltages are referenced to ground unless otherwise
specified.
Note 3:
An internal Zener at the GATE pin clamps the charge pump voltage
to a typical maximum operating voltage of 26V. External voltage applied to
the GATE pin beyond the internal Zener voltage may damage the part. If a
lower GATE pin voltage is desired, use an external Zener diode. The GATE
capacitance must be < 0.15µF at maximum V
CC
.
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
4.0
3.5
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
3.0
2.5
2.0
1.5
1.0
0.5
0
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4211 G01
Supply Current vs Temperature
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–75 –50 –25
V
CC
= 15V
V
CC
= 12V
V
CC
= 5V
V
CC
= 3V
0 25 50 75 100 125 150
TEMPERATURE (°C)
4211 G02
Undervoltage Lockout Threshold
vs Temperature
UNDERVOLTAGE LOCKOUT THRESHOLD (V)
2.5
2.4
RISING EDGE
T
A
= 25°C
4.0
2.3
2.2
2.1
2.0
–75 –50 –25
FALLING EDGE
0 25 50 75 100 125 150
TEMPERATURE (°C)
4211 G03
ON Pin Threshold
vs Supply Voltage
1.40
1.35
ON PIN THRESHOLD (V)
ON PIN THRESHOLD (V)
HIGH THRESHOLD
1.30
1.25
1.20
1.15
1.10
LOW THRESHOLD
T
A
= 25°C
1.40
1.35
ON Pin Threshold
vs Temperature
V
CC
= 5V
HIGH THRESHOLD
GATE VOLTAGE (V)
1.30
1.25
1.20
1.15
1.10
–75 –50 –25
LOW THRESHOLD
20
15
10
5
0
30
25
GATE Voltage vs Supply Voltage
T
A
= 25°C
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4211 G04
0 25 50 75 100 125 150
TEMPERATURE (°C)
4211 G05
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4211 G06
4211fc
4
For more information
www.linear.com/LTC4211
LTC4211
TYPICAL PERFORMANCE CHARACTERISTICS
GATE Voltage vs Temperature
30
25
V
CC
= 12V
GATE VOLTAGE (V)
V
GATE
– V
CC
(V)
20
15
10
5
0
–75 –50 –25
V
CC
= 3V
V
CC
= 5V
V
CC
= 15V
18
16
14
V
GATE
– V
CC
(V)
12
10
8
6
4
2
0 25 50 75 100 125 150
TEMPERATURE (°C)
4211 G07
V
GATE
– V
CC
vs Supply Voltage
T
A
= 25°C
18
16
14
12
10
8
6
4
2
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4211 G08
V
GATE
– V
CC
vs Temperature
V
CC
= 12V
V
CC
= 15V
V
CC
= 5V
V
CC
= 3V
0
0
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4211 G09
GATE Output Source Current
vs Supply Voltage
13
GATE OUTPUT SOURCE CURRENT (µA)
12
11
10
9
8
7
T
A
= 25°C
GATE OUTPUT SOURCE CURRENT (µA)
13
12
11
10
9
8
GATE Output Source Current
vs Temperature
NORMAL GATE PULL-DOWN CURRENT (µA)
260
240
220
200
180
160
140
Normal GATE Pull-Down Current
vs Supply Voltage
T
A
= 25°C
V
CC
= 15V
V
CC
= 3V
V
CC
= 12V
V
CC
= 5V
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4211 G10
7
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4211 G11
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4211 G12
Normal GATE Pull-Down Current
vs Temperature
NORMAL GATE PULL-DOWN CURRENT (µA)
260
240
220
200
180
160
140
–75 –50 –25
FAST GATE PULL-DOWN CURRENT (mA)
V
CC
= 5V
80
70
60
50
40
30
20
0 25 50 75 100 125 150
TEMPERATURE (°C)
4211 G13
Fast GATE Pull-Down Current
vs Supply Voltage
FAST GATE PULL-DOWN CURRENT (mA)
T
A
= 25°C
80
70
60
50
40
30
Fast GATE Pull-Down Current
vs Temperature
V
CC
= 5V
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4211 G14
20
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4211 G15
4211fc
For more information
www.linear.com/LTC4211
5
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