LTC4210-3/LTC4210-4
Hot Swap Controller in
6-Lead SOT-23 Package
FEATURES
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DESCRIPTIO
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
TM
) Package
The LTC
®
4210-3/LTC4210-4 is a 6-pin SOT-23 Hot Swap
TM
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 retries on overcurrent fault and the
LTC4210-4 latches off on an overcurrent fault.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
ThinSOT and Hot Swap are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
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Hot Board Insertion
Electronic Circuit Breaker
Industrial High Side Switch/Circuit Breaker
TYPICAL APPLICATIO
BACKPLANE
PCB EDGE
CONNECTOR
CONNECTOR
(MALE)
(FEMALE)
Single Channel 5V Hot Swap Controller
V
IN
5V
LONG
Z1
OPTIONAL
10Ω
0.1µF
R
SENSE
0.01Ω
Q1
Si4410DY
+
470µF
V
OUT
5V
4A
V
CC
SHORT
20k
SENSE
GATE
100Ω
ON LTC4210-3
10k
100Ω
0.01µF
TIMER
GND
0.22µF
GND
LONG
Z1: ISMA10A OR SMAJ10A
4210 TA01
GND
U
Power-Up Sequence
C
LOAD
= 470µF
U
U
V
ON
(2V/DIV)
V
TIMER
(1V/DIV)
V
OUT
(5V/DIV)
I
OUT
(0.5A/DIV)
10ms/DIV
4210 TA02
421034fa
1
LTC4210-3/LTC4210-4
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
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
LTC4210-3CS6
LTC4210-4CS6
LTC4210-3IS6
LTC4210-4IS6
S6 PART MARKING
LTCPJ
LTCPM
LTCPK
LTCPN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C,
θ
JA
= 230°C/ W
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
CC
I
CC
V
LKOR
V
LKOHYST
I
INON
I
INSENSE
V
CB
I
GATEUP
I
GATEDN
∆V
GATE
PARAMETER
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
The
●
denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
CC
= 5V, unless otherwise noted. (Note 2)
CONDITIONS
Supply Voltage
V
CC
Rising
●
●
●
●
MIN
2.7
2.2
–10
–10
44
–5
TYP
0.75
2.5
100
0
5
50
– 10
25
MAX
7.0
3.5
2.65
10
10
56
–15
External N-Channel Gate Drive
V
GATE
GATE Pin Voltage
I
TIMERUP
I
TIMERDN
V
TIMER
V
TMRHYST
V
ON
V
ONHYST
TIMER Pin Pull-Up Current
TIMER Pin Pull-Down Current
TIMER Pin Threshold
TIMER Low Threshold Hysteresis
ON Pin Threshold
ON Pin Threshold Hysteresis
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
– 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
CC
= 2.7V
V
CC
= 3.0V
V
CC
= 3.3V
V
CC
= 5.0V
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
ON Threshold, ON Rising
●
●
●
UNITS
V
mA
V
mV
µA
µA
mV
µA
mA
●
●
●
●
●
●
●
●
●
●
●
●
●
●
4.0
4.5
5.0
5.0
6.7
7.5
8.3
10.0
–2
–25
1.22
0.15
1.22
6.5
7.5
8.5
7.0
9.2
10.5
11.8
12.0
–5
–60
2
100
1.3
0.2
100
1.3
80
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
421034fa
2
U
V
V
V
V
V
V
V
V
µA
µA
µA
µA
V
V
mV
V
mV
W
U
U
W W
W
LTC4210-3/LTC4210-4
ELECTRICAL CHARACTERISTICS
SYMBOL
t
OFF(TMRHIGH)
t
OFF(ONLOW)
t
OFF(VCCLOW)
PARAMETER
Turn-Off Time (TIMER Rise to GATE Fall)
Turn-Off Time (ON Fall to GATE Fall)
Turn-Off Time (V
CC
Fall to IC Reset)
The
●
denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
CC
= 5V, unless otherwise noted. (Note 2)
CONDITIONS
V
TIMER
= 0V to 2V Step, V
CC
= V
ON
= 5V
V
ON
= 5V to 0V Step, V
CC
= 5V
V
CC
= 5V to 2V Step, V
ON
= 5V
MIN
TYP
1
30
30
MAX
UNITS
µs
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 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
.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
2.0
1.8
1.6
T
A
= 25°C
V
S
= 5V
SUPPLY CURRENT (mA)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
V
CC
= 3V
V
CC
= 5V
UNDERVOLTAGE LOCKOUT THRESHOLD (V)
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)
LTC4210 • G01
V
GATE
vs Supply Voltage
16
15
14
13
V
GATE
(V)
V
GATE
(V)
I
GATEUP
(µA)
12
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)
LTC4210 • G04
U W
Supply Current vs Temperature
2.0
Undervoltage Lockout Threshold
vs Temperature
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)
LTC4210 • G03
V
CC
RISING
V
CC
FALLING
0.0
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LTC4210 • G02
V
GATE
vs Temperature
16
15
14
13
12
11
10
9
8
7
6
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LTC4210 • G05
I
GATEUP
vs Supply Voltage
–8.0
–8.5
V
CC
= 5V
TA = 25°C
–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)
LTC4210 • G06
V
CC
= 3V
421034fa
3
LTC4210-3/LTC4210-4
TYPICAL PERFOR A CE CHARACTERISTICS
I
GATEUP
vs Temperature
–8.0
–8.5
–9.0
12
11
10
9
I
GATEUP
(µA)
∆V
GATE
(V)
–10.0
–10.5
–11
–11.5
–12.0
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LTC4210 • G07
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)
LTC4210 • G08
∆V
GATE
(V)
–9.5
I
TIMERUP
(In Initial Cycle)
vs Supply Voltage
0
–1
–2
–3
TA = 25
°C
0
–1
–2
–3
I
TIMERUP
(µA)
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)
LTC4210 • G10
I
TIMERUP
(During Circuit Breaker
Delay) vs Temperature
–20
–30
–40
V
CC
= 5V
3.0
2.8
2.6
2.4
I
TIMERUP
(µA)
I
TIMERDN
(µA)
–50
–60
–70
–80
–90
–100
–75 –50 –25
0 25 50 75 100 125 150
SUPPLY VOLTAGE (V)
LTC4210 • G13
2.2
2.0
1.8
1.6
1.4
1.2
1.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
LTC4210 • G14
I
TIMERDN
(µA)
4
U W
V
CC
= 3V
V
CC
= 5V
∆V
GATE
vs Supply Voltage
12
11
10
9
8
7
6
5
4
3
∆V
GATE
vs Temperature
8
V
CC
= 5V
V
CC
= 3V
2
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LTC4210 • G09
I
TIMERUP
(In Initial Cycle)
vs Temperature
–20
V
CC
= 5V
I
TIMERUP
(During Circuit Breaker
Delay) vs Supply Voltage
TA = 25°C
–30
–40
–50
–60
–70
–80
–90
–4
–5
–6
–7
–8
–9
–10
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LTC4210 • G11
–100
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
LTC4210 • G12
I
TIMERDN
(In Cool-Off Cycle)
vs Supply Voltage
3.0
TA = 25°C
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
I
TIMERDN
(In Cool-Off Cycle)
vs Temperature
V
CC
= 5V
1.0
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LTC4210 • G15
421034fa
LTC4210-3/LTC4210-4
TYPICAL PERFOR A CE CHARACTERISTICS
TIMER High Threshold
vs Supply Voltage
1.38
TA = 25°C
1.36
1.36
1.38
V
CC
= 5V
TIMER HIGH THRESHOLD (V)
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)
LTC4210 • G16
1.34
1.32
1.30
1.28
1.26
1.24
1.22
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LTC4210 • G17
TIMER LOW THRESHOLD (V)
TIMER Low Threshold
vs Temperature
0.24
0.23
V
CC
= 5V
1.45
1.40
TIMER LOW THRESHOLD (V)
ON PIN THRESHOLD (V)
0.22
0.21
0.20
0.19
0.18
0.17
0.16
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LTC4210 • G19
1.35
1.30
1.25
1.20
1.15
1.10
1.05
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
LTC4210 • G20
ON PIN THRESHOLD (V)
t
OFF(ONLOW)
vs Supply Voltage
50
45
40
T
OFF, ONLOW
(µs)
TA = 25°C
30
25
20
15
10
5
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
SUPPLY VOLTAGE (V)
LTC4210 • G22
T
OFF, ONLOW
(µs)
35
U W
TIMER High Threshold
vs Temperature
0.24
0.23
0.22
0.21
0.20
0.19
0.18
0.17
TIMER Low Threshold
vs Supply Voltage
TA = 25°C
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)
LTC4210 • G18
ON Pin Threshold
vs Supply Voltage
1.45
TA = 25°C
1.40
1.35
1.30
1.25
1.20
1.15
1.10
ON Pin Threshold
vs Temperature
V
CC
= 5V
HIGH THRESHOLD
HIGH THRESHOLD
LOW THRESHOLD
LOW THRESHOLD
1.05
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LTC4210 • G21
t
OFF(ONLOW)
vs Temperature
50
45
40
35
30
25
20
15
10
5
0
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LTC4210 • G23
v
cc
= 5v
v
cc
= 3v
421034fa
5
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