LTC4210-1/LTC4210-2
Hot Swap Controller in
6-Lead SOT-23 Package
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
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
TM
) Package
The LTC
®
4210 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 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT and Hot Swap are trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
Hot Board Insertion
Electronic Circuit Breaker
Industrial High Side Switch/Circuit Breaker
TYPICAL APPLICATIO
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE)
(MALE)
V
IN
5V
LONG
Single Channel 5V Hot Swap Controller
R
SENSE
0.01Ω
Z1
OPTIONAL
R
X
10Ω
C
X
0.1µF
V
CC
SENSE
GATE
Q1
Si4410DY
+
R
G
100Ω
R
C
100Ω
C
C
0.01µF
V
OUT
5V
470µF 4A
C
LOAD
SHORT
R
ON1
20k
ON
R
ON2
10k
LTC4210
TIMER
GND
C
TIMER
0.22µF
GND
LONG
Z1: ISMA10A OR SMAJ10A
GND
4210 TA01
U
Power-Up Sequence
C
LOAD
= 470µF
V
ON
(2V/DIV)
V
TIMER
(1V/DIV)
V
OUT
(5V/DIV)
I
OUT
(0.5A/DIV)
10ms/DIV
4210 TA02
U
U
421012f
1
LTC4210-1/LTC4210-2
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
LTC4210-1C/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
LTC4210-1CS6
LTC4210-2CS6
LTC4210-1IS6
LTC4210-2IS6
S6 PART MARKING
LTYW
LTYX
LTF5
LTF6
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C,
θ
JA
= 230°C/ W
Consult LTC Marketing 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
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
The
q
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
q
q
MIN
2.7
2.2
–10
–10
44
–5
TYP
0.65
2.5
100
0
5
50
– 10
25
V
CC
Rising
q
q
MAX
16.5
3.5
2.65
10
10
56
–15
External N-Channel Gate Drive
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
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
q
q
q
UNITS
V
mA
V
mV
µA
µA
mV
µA
mA
q
q
q
q
q
q
q
q
q
q
q
q
4.0
4.5
5.0
10
9.0
6.0
–2
–25
1.22
0.15
1.22
6.5
7.5
8.5
12
12
11
–5
–60
2
100
1.3
0.2
100
1.3
80
8
10
12
16
16
18
–8.5
–100
3.5
1.38
0.25
1.38
421012f
2
U
V
V
V
V
V
V
µA
µA
µA
µA
V
V
mV
V
mV
W
U
U
W W
W
LTC4210-1/LTC4210-2
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
q
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:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
4.0
3.5
SUPPLY CURRENT (mA)
T
A
= 25°C
UNDERVOLTAGE LOCKOUT THRESHOLD (V)
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 (mA)
V
GATE
vs Supply Voltage
40
35
30
V
GATE
(V)
V
GATE
(V)
T
A
= 25°C
25
20
15
10
5
20
15
10
5
0
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G04
V
CC
= 12V
V
CC
= 5V
I
GATEUP
(µA)
25
U W
Supply Current vs Temperature
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
V
CC
RISING
V
CC
FALLING
TEMPERATURE (°C)
V
GATE
vs Temperature
40
35
30
V
CC
= 15V
–8.0
–8.5
–9.0
–9.5
–10.0
–10.5
–11.0
V
CC
= 3V
–11.5
–12.0
0
25
50
75 100 125 150
4210 G05
I
GATEUP
vs Supply Voltage
T
A
= 25°C
0
–75 –50 –25
0
2
4
TEMPERATURE (°C)
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G06
421012f
3
LTC4210-1/LTC4210-2
TYPICAL PERFOR A CE CHARACTERISTICS
I
GATEUP
vs Temperature
–8.0
–8.5
–9.0
I
GATEUP
(µA)
∆V
GATE
(V)
–10.0
–10.5
–11.0
–11.5
V
CC
= 15V
V
CC
= 5V
∆V
GATE
(V)
–9.5
V
CC
= 3V
V
CC
= 12V
–12.0
–75 –50 –25
0
25
50
75 100 125 150
4210 G07
TEMPERATURE (°C)
I
TIMERUP
(In Initial Cycle)
vs Supply Voltage
0
–1
–2
–3
I
TIMERUP
(µA)
I
TIMERUP
(µA)
T
A
= 25°C
–4
–5
–6
–7
–8
–9
–4
–5
–6
–7
–8
–9
I
TIMERUP
(µA)
–10
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G10
I
TIMERUP
(During Circuit Breaker
Delay) vs Temperature
–20
V
CC
= 5V
–30
–40
I
TIMERUP
(µA)
I
TIMERDN
(µA)
–50
–60
–70
2.2
2.0
1.8
1.6
I
TIMERDN
(µA)
–80
–90
–100
–75 –50 –25
0
25
50
75 100 125 150
TEMPERATURE (°C)
4210 G13
4
U W
∆V
GATE
vs Supply Voltage
18
16
14
12
10
8
6
4
2
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G08
∆V
GATE
vs Temperature
18
16
14
12
10
8
6
4
2
–75 –50 –25
0
25
50
75 100 125 150
V
CC
= 12V
V
CC
= 15V
V
CC
= 3V
V
CC
= 5V
T
A
= 25°C
TEMPERATURE (°C)
4210 G09
I
TIMERUP
(In Initial Cycle)
vs Temperature
0
–1
–2
–3
–40
–50
–60
–70
V
CC
= 5V
–20
–30
I
TIMERUP
(During Circuit Breaker
Delay) vs Supply Voltage
T
A
= 25°C
–80
–90
0
25
50
75 100 125 150
–100
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G12
–10
–75 –50 –25
TEMPERATURE (°C)
4210 G11
I
TIMERDN
(In Cool-Off Cycle)
vs Supply Voltage
3.0
2.8
2.6
2.4
T
A
= 25°C
3.0
2.8
2.6
2.4
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
1.4
1.2
1.0
1.0
–75 –50 –25
0
25
50
75 100 125 150
TEMPERATURE (°C)
4210 G15
421012f
LTC4210-1/LTC4210-2
TYPICAL PERFOR A CE CHARACTERISTICS
TIMER High Threshold
vs Supply Voltage
1.38
1.36
T
A
= 25°C
1.38
V
CC
= 5V
1.36
TIMER HIGH THRESHOLD (V)
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
1.34
1.32
1.30
1.28
1.26
1.24
1.22
–75 –50 –25
0
25
50
75 100 125 150
TIMER LOW THRESHOLD (V)
TIMER Low Threshold
vs Temperature
0.24
0.23
1.45
V
CC
= 5V
1.40
TIMER LOW THRESHOLD (V)
ON PIN 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)
4210 G19
t
OFF(ONLOW)
vs Supply Voltage
80
70
60
T
A
= 25°C
80
70
60
t
OFF,ONLOW
(µs)
t
OFF,ONLOW
(µs)
50
40
30
20
10
0
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G22
U W
TIMER High Threshold
vs Temperature
0.24
0.23
0.22
0.21
0.20
0.19
0.18
0.17
0.16
TIMER Low Threshold
vs Supply Voltage
T
A
= 25°C
0
2
4
TEMPERATURE (°C)
4210 G17
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G18
ON Pin Threshold
vs Supply Voltage
T
A
= 25°C
1.45
1.40
1.35
ON Pin Threshold
vs Temperature
V
CC
= 5V
1.35
HIGH THRESHOLD
1.30
1.25
1.20
1.15
1.10
1.05
0
2
4
6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G20
HIGH THRESHOLD
1.30
1.25
1.20
1.15
1.10
1.05
–75 –50 –25
0
25
50
75 100 125 150
LOW THRESHOLD
LOW THRESHOLD
TEMPERATURE (°C)
4210 G21
t
OFF(ONLOW)
vs Temperature
V
CC
= 15V
50
40
30
20
10
0
–75 –50 –25
0
25
50
V
CC
= 12V
V
CC
= 5V
V
CC
= 3V
75 100 125 150
TEMPERATURE (°C)
4210 G23
421012f
5
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