LTC4210-3/LTC4210-4
Hot Swap Controller in
6-Lead SOT-23 Package
FEATURES
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DESCRIPTION
The
LTC
®
4210-3/LTC4210-4
is a 6-pin SOT-23 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 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 autoretries on overcurrent fault and the
LTC4210-4 latches off on an overcurrent fault.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Analog Devices, Inc. All other trademarks are the property of their
respective owners.
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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™) Package
APPLICATIONS
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Hot Board Insertion
Electronic Circuit Breaker
Industrial High Side Switch/Circuit Breaker
TYPICAL APPLICATION
Single Channel 5V Hot Swap Controller
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE)
(MALE)
V
IN
5V
LONG
Z1
OPTIONAL
10Ω
0.1µF
V
CC
SHORT
20k
10k
SENSE
GATE
100Ω
V
TIMER
(1V/DIV)
R
SENSE
0.01Ω
Q1
Si4410DY
Power-Up Sequence
+
470µF
V
OUT
5V
4A
C
LOAD
= 470µF
V
ON
(2V/DIV)
ON LTC4210-3
TIMER
GND
100Ω
0.01µF
V
OUT
(5V/DIV)
GND
LONG
Z1: ISMA10A OR SMAJ10A
0.22µF
GND
4210 TA01a
I
OUT
(0.5A/DIV)
10ms/DIV
4210 TA02b
421034b
For more information
www.linear.com/LTC4210-3
1
LTC4210-3/LTC4210-4
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
TIMER 1
GND 2
ON 3
6 V
CC
5 SENSE
4 GATE
Supply Voltage (V
CC
) ................................................17V
Input Voltage (SENSE, TIMER) .... –0.3V to (V
CC
+ 0.3V)
Input Voltage (ON) ..................................... –0.3V to 17V
Output Voltage (GATE) .......... Internally Limited (Note 3)
Operating Temperature Range
LTC4210-3C/LTC4210-4C ........................ 0°C to 70°C
LTC4210-3I/LTC4210-4I.......................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C,
θ
JA
= 230°C/W
ORDER INFORMATION
TAPE AND REEL (MINI)
LTC4210-3CS6#TRMPBF
LTC4210-4CS6#TRMPBF
LTC4210-3IS6#TRMPBF
LTC4210-4IS6#TRMPBF
TAPE AND REEL
LTC4210-4CS6#TRPBF
LTC4210-4CS6#TRPBF
LTC4210-3IS6#TRPBF
LTC4210-4IS6#TRPBF
http://www.linear.com/product/LTC4210-3#orderinfo
PART MARKING
LTCPJ
LTCPM
LTCPK
LTCPN
PACKAGE DESCRIPTION
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–40°C to 85°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.
2
421034fb
For more information
www.linear.com/LTC4210-3
LTC4210-3/LTC4210-4
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
LKOR
V
LKOHYST
I
INON
I
INSENSE
V
CB
I
GATEUP
I
GATEDN
V
CC
Supply Current
V
CC
Undervoltage Lockout Release
V
CC
Undervoltage Lockout Hysteresis
ON Pin Input Current
SENSE Pin Input Current
Circuit Breaker Trip Voltage
GATE Pin Pull-Up Current
GATE Pin Pull-Down Current
V
SENSE
= V
CC
V
CB
= (V
CC
– V
SENSE
)
V
GATE
= 0V
V
TIMER
= 1.5V, V
GATE
= 3V or
V
ON
= 0V, V
GATE
= 3V or
V
CC
– V
SENSE
= 100mV, V
GATE
= 3V
∆V
GATE
External N-Channel Gate Drive
V
GATE
– V
CC
, V
CC
= 2.7V
V
GATE
– V
CC
, V
CC
= 3V
V
GATE
– V
CC
, V
CC
= 3.3V
V
GATE
– V
CC
, V
CC
= 5V
V
GATE
GATE Pin Voltage
V
CC
= 2.7V
V
CC
= 3.0V
V
CC
= 3.3V
V
CC
= 5.0V
I
TIMERUP
I
TIMERDN
V
TIMER
V
TMRHYST
V
ON
V
ONHYST
t
OFF(TMRHIGH)
t
OFF(ONLOW)
t
OFF(VCCLOW)
TIMER Pin Pull-Up Current
TIMER Pin Pull-Down Current
TIMER Pin Threshold
TIMER Low Threshold Hysteresis
ON Pin Threshold
ON Pin Threshold Hysteresis
Turn-Off Time (TIMER Rise to GATE Fall) V
TIMER
= 0V to 2V Step, V
CC
= V
ON
= 5V
Turn-Off Time (ON Fall to GATE Fall)
V
ON
= 5V to 0V Step, V
CC
= 5V
Turn-Off Time (V
CC
Fall to IC Reset)
V
CC
= 5V to 2V Step, V
ON
= 5V
ON Threshold, ON Rising
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ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
Supply Voltage
V
CC
Rising
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MIN
2.7
TYP
0.75
MAX
7.0
3.5
2.65
10
10
56
–15
UNITS
V
mA
V
mV
µA
µA
mV
µA
mA
2.2
–10
–10
44
–5
2.5
100
0
5
50
–10
25
4.0
4.5
5.0
5.0
6.7
7.5
8.3
10.0
–2
–25
6.5
7.5
8.5
7.0
9.2
10.5
11.8
12.0
–5
–60
2
100
8
10
9.7
8.0
10.7
13.0
13.0
13.0
–8.5
–100
3.5
1.38
0.25
1.38
V
V
V
V
V
V
V
V
µA
µA
µA
µA
V
V
mV
V
mV
µs
µs
µs
Initial Cycle, V
TIMER
= 1V
During Current Fault Condition, V
TIMER
= 1V
After Current Fault Disappears, V
TIMER
= 1V
Under Normal Conditions, V
TIMER
= 1V
High Threshold, TIMER Rising
Low Threshold, TIMER Falling
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1.22
0.15
1.22
1.3
0.2
100
1.3
80
1
30
30
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 currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 3:
An internal Zener clamped the GATE pin to a typical voltage of 12V.
External overdrive of the GATE pin beyond the internal Zener voltage may
damage the device. Without a limiting resistor, the GATE capacitance must
be <0.15µF at maximum V
CC
.
421034b
For more information
www.linear.com/LTC4210-3
3
LTC4210-3/LTC4210-4
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
2.0
1.8
1.6
SUPPLY CURRENT (mA)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
4210 G01
Supply Current vs Temperature
1.8
1.6
SUPPLY CURRENT (mA)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G02
Undervoltage Lockout Threshold
vs Temperature
UNDERVOLTAGE LOCKOUT THRESHOLD (V)
2.65
2.60
2.55
2.50
2.45
2.40
2.35
2.30
2.25
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G03
2.0
T
A
= 25°C
V
CC
RISING
V
CC
= 5V
V
CC
FALLING
V
CC
= 3V
V
GATE
vs Supply Voltage
16
15
14
13
V
GATE
(V)
11
10
9
8
7
6
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
4210 G04
V
GATE
vs Temperature
16
15
14
13
V
GATE
(V)
12
11
10
9
8
7
6
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G05
I
GATEUP
vs Supply Voltage
–8.0
–8.5
V
CC
= 5V
I
GATEUP
(µA)
–9.0
–9.5
–10.0
–10.5
–11
–11.5
–12.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
4210 G06
T
A
= 25°C
T
A
= 25°C
12
V
CC
= 3V
I
GATEUP
vs Temperature
–8.0
–8.5
–9.0
I
GATEUP
(µA)
∆V
GATE
(V)
–9.5
–10.0
–10.5
–11
–11.5
–12.0
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G07
∆V
GATE
vs Supply Voltage
12
11
10
9
7
6
5
4
3
2
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
4210 G08
∆V
GATE
vs Temperature
12
11
10
9
∆V
GATE
(V)
8
7
6
5
4
3
2
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G09
T
A
= 25°C
8
V
CC
= 5V
V
CC
= 3V
V
CC
= 3V
V
CC
= 5V
4
421034fb
For more information
www.linear.com/LTC4210-3
LTC4210-3/LTC4210-4
TYPICAL PERFORMANCE CHARACTERISTICS
I
TIMERUP
(In Initial Cycle)
vs Supply Voltage
0
–1
–2
–3
I
TIMERUP
(µA)
I
TIMERUP
(µA)
–4
–5
–6
–7
–8
–9
–10
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
4210 G10
I
TIMERUP
(In Initial Cycle)
vs Temperature
0
–20
V
CC
= 5V
–30
–40
I
TIMERUP
(µA)
–50
–60
–70
–80
–90
0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G11
I
TIMERUP
(During Circuit Breaker
Delay) vs Supply Voltage
T
A
= 25°C
T
A
= 25°C
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
–75 –50 –25
–100
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
4210 G12
I
TIMERUP
(During Circuit Breaker
Delay) vs Temperature
–20
–30
–40
I
TIMERUP
(µA)
I
TIMERDN
(µA)
–50
–60
–70
–80
–90
–100
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G13
I
TIMERDN
(In Cool-Off Cycle)
vs Supply Voltage
3.0
3.0
T
A
= 25°C
2.8
2.6
2.4
I
TIMERDN
(µA)
2.2
2.0
1.8
1.6
1.4
1.2
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
4210 G14
I
TIMERDN
(In Cool-Off Cycle)
vs Temperature
V
CC
= 5V
V
CC
= 5V
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
1.0
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G15
TIMER High Threshold
vs Supply Voltage
1.38
1.36
TIMER HIGH THRESHOLD (V)
1.34
1.32
1.30
1.28
1.26
1.24
1.22
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
4210 G16
TIMER High Threshold
vs Temperature
1.38
0.24
V
CC
= 5V
TIMER LOW THRESHOLD (V)
0.23
0.22
0.21
0.20
0.19
0.18
0.17
0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G17
TIMER Low Threshold
vs Supply Voltage
T
A
= 25°C
T
A
= 25°C
TIMER HIGH THRESHOLD (V)
1.36
1.34
1.32
1.30
1.28
1.26
1.24
1.22
–75 –50 –25
0.16
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
4210 G18
421034b
For more information
www.linear.com/LTC4210-3
5
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