LTC4210-1/LTC4210-2
Hot Swap Controller in
6-Lead SOT-23 Package
FEATURES
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DESCRIPTION
The
LTC
®
4210
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 16.5V. 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.
This part is available in two options: the LTC4210-1 for
automatic retry on overcurrent fault and the LTC4210-2
for latch off on an overcurrent fault.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark 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
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 16.5V
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
R
X
10
C
X
0.1µF
V
CC
SHORT
R
ON1
20k
R
ON2
10k
SENSE
GATE
R
SENSE
0.01
Q1
Si4410DY
+
R
G
100
R
C
100
C
C
0.01µF
V
OUT
5V
470µF 4A
C
LOAD
Power-Up Sequence
C
LOAD
= 470µF
V
ON
(2V/DIV)
V
TIMER
(1V/DIV)
ON
LTC4210
TIMER
GND
C
TIMER
0.22µF
V
OUT
(5V/DIV)
GND
LONG
Z1: ISMA10A OR SMAJ10A
I
OUT
(0.5A/DIV)
GND
4210 TA01
10ms/DIV
4210 TA02
421012fa
For more information
www.linear.com/LTC4210-1
1
LTC4210-1/LTC4210-2
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
LTC4210-1C/LTC4210-2C ......................... 0°C to 70°C
LTC4210-1I/LTC4210-2I .......................–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
Lead Free Finish
TAPE AND REEL (MINI)
LTC4210-1CS6#TRMPBF
LTC4210-2CS6#TRMPBF
LTC4210-1IS6#TRMPBF
TAPE AND REEL
LTC4210-1CS6#TRPBF
LTC4210-2CS6#TRPBF
LTC4210-1IS6#TRPBF
http://www.linear.com/product/LTC4210-1#orderinfo
PART MARKING
LTYW
LTYX
LTF5
PACKAGE DESCRIPTION
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
LTC4210-2IS6#TRMPBF
LTC4210-2IS6#TRPBF
LTF6
6-Lead Plastic TSOT-23
TRM = 500 pieces.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
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/
421012fa
2
For more information
www.linear.com/LTC4210-1
LTC4210-1/LTC4210-2
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
GATE
PARAMETER
Supply Voltage
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
– 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
– V
CC
, V
CC
= 12V
V
GATE
– V
CC
, V
CC
= 15V
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
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
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ELECTRICAL CHARACTERISTICS
CONDITIONS
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MIN
2.7
TYP
0.65
MAX
16.5
3.5
2.65
10
10
56
–15
UNITS
V
mA
V
mV
µA
µA
mV
µA
mA
V
CC
Rising
l
2.2
–10
–10
44
–5
2.5
100
0
5
50
–10
25
External N-Channel Gate Drive
4.0
4.5
5.0
10
9.0
6.0
–2
–25
6.5
7.5
8.5
12
12
11
–5
–60
2
100
8
10
12
16
16
18
–8.5
–100
3.5
1.38
0.25
1.38
V
V
V
V
V
V
µA
µA
µA
µA
V
V
mV
V
mV
µs
µs
µs
I
TIMERUP
I
TIMERDN
V
TIMER
V
TMRHYST
V
ON
V
ONHYST
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 (ON Fall to GATE Fall)
Turn-Off Time (V
CC
Fall to IC Reset)
1.22
0.15
1.22
1.3
0.2
100
1.3
80
1
30
30
l
t
OFF(TMRHIGH)
Turn-Off Time (TIMER Rise to GATE Fall)
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 on the GATE pin clamps the charge pump
voltage to a typical maximum voltage of 26V. 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
. If a lower GATE pin clamp voltage is desired, an external
Zener diode may be used.
421012fa
For more information
www.linear.com/LTC4210-1
3
LTC4210-1/LTC4210-2
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)
4210 G01
Supply Current vs Temperature
UNDERVOLTAGE LOCKOUT THRESHOLD (V)
4.0
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)
4210 G02
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
4210 G03
T
A
= 25°C
V
CC
RISING
V
CC
FALLING
TEMPERATURE (°C)
40
35
30
V
GATE
(V)
V
GATE
vs Supply Voltage
T
A
= 25°C
40
35
30
V
GATE
(V)
25
20
15
10
5
V
GATE
vs Temperature
–8.0
–8.5
I
GATEUP
vs Supply Voltage
T
A
= 25°C
V
CC
= 15V
V
CC
= 12V
V
CC
= 5V
V
CC
= 3V
I
GATEUP
(µA)
–9.0
–9.5
–10.0
–10.5
–11.0
–11.5
25
20
15
10
5
0
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G04
0
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G05
–12.0
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G06
I
GATEUP
vs Temperature
–8.0
–8.5
–9.0
I
GATEUP
(µA)
∆V
GATE
(V)
–9.5
–10.0
–10.5
–11.0
–11.5
–12.0
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G07
∆V
GATE
vs Supply Voltage
18
16
14
T
A
= 25°C
18
16
14
∆V
GATE
(V)
12
10
8
6
4
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G08
∆V
GATE
vs Temperature
V
CC
= 5V
V
CC
= 12V
12
10
8
6
4
2
0
V
CC
= 3V
V
CC
= 12V
V
CC
= 5V
V
CC
= 15V
V
CC
= 15V
V
CC
= 3V
2
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G09
421012fa
4
For more information
www.linear.com/LTC4210-1
LTC4210-1/LTC4210-2
TYPICAL PERFORMANCE CHARACTERISTICS
I
TIMERUP
(In Initial Cycle)
vs Supply Voltage
0
–1
–2
–3
I
TIMERUP
(µA)
–4
–5
–6
–7
–8
–9
–10
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G10
I
TIMERUP
(In Initial Cycle)
vs Temperature
0
–1
–2
–3
I
TIMERUP
(µA)
–4
–5
–6
–7
–8
–9
–10
–75 –50 –25
0
25
50
75 100 125 150
4210 G11
I
TIMERUP
(During Circuit Breaker
Delay) vs Supply Voltage
–20
–30
–40
I
TIMERUP
(µA)
–50
–60
–70
T
A
= 25°C
T
A
= 25°C
V
CC
= 5V
–80
–90
–100
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G12
TEMPERATURE (°C)
I
TIMERUP
(During Circuit Breaker
Delay) vs Temperature
–20
–30
–40
I
TIMERUP
(µA)
I
TIMERDN
(µA)
–50
–60
–70
V
CC
= 5V
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
0
25
50
75 100 125 150
4210 G13
I
TIMERDN
(In Cool-Off Cycle)
vs Supply Voltage
T
A
= 25°C
3.0
2.8
2.6
2.4
I
TIMERDN
(µA)
2.2
2.0
1.8
1.6
1.4
1.2
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G14
I
TIMERDN
(In Cool-Off Cycle)
vs Temperature
V
CC
= 5V
–80
–90
–100
–75 –50 –25
1.0
1.0
–75 –50 –25
0
25
50
75 100 125 150
4210 G15
TEMPERATURE (°C)
TEMPERATURE (°C)
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
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G16
TIMER High Threshold
vs Temperature
1.38
1.36
TIMER HIGH THRESHOLD (V)
1.34
1.32
1.30
1.28
1.26
1.24
1.22
–75 –50 –25
0
25
50
75 100 125 150
4210 G17
TIMER Low Threshold
vs Supply Voltage
0.24
0.23
TIMER LOW THRESHOLD (V)
0.22
0.21
0.20
0.19
0.18
0.17
0.16
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G18
T
A
= 25°C
V
CC
= 5V
T
A
= 25°C
TEMPERATURE (°C)
421012fa
For more information
www.linear.com/LTC4210-1
5
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