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PDF LTC4210-4 Data sheet ( Hoja de datos )
| Número de pieza | LTC4210-4 | |
| Descripción | Hot Swap Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4210-3/LTC4210-4
Hot Swap Controller in
6-Lead SOT-23 Package
FEATURES
■ 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 (ThinSOTTM) Package
U
APPLICATIO S
■ Hot Board Insertion
■ Electronic Circuit Breaker
■ Industrial High Side Switch/Circuit Breaker
DESCRIPTIO
The LTC®4210-3/LTC4210-4 is a 6-pin SOT-23 Hot SwapTM
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.
TYPICAL APPLICATIO
Single Channel 5V Hot Swap Controller
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE) (MALE)
VIN LONG
5V
Z1 10Ω
OPTIONAL
0.1µF
RSENSE
0.01Ω
Q1
Si4410DY
+
VOUT
5V
4A
470µF
VCC SENSE
GATE
100Ω
SHORT 20k
ON LTC4210-3
100Ω
10k TIMER
GND
0.01µF
GND
LONG
Z1: ISMA10A OR SMAJ10A
0.22µF
GND
4210 TA01
Power-Up Sequence
CLOAD = 470µF
VON
(2V/DIV)
VTIMER
(1V/DIV)
VOUT
(5V/DIV)
10ms/DIV
IOUT
(0.5A/DIV)
4210 TA02
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TYPICAL PERFOR A CE CHARACTERISTICS
LTC4210-3/LTC4210-4
TIMER High Threshold
vs Supply Voltage
1.38
TA = 25°C
1.36
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
TIMER Low Threshold
vs Temperature
0.24
VCC = 5V
0.23
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
TIMER High Threshold
vs Temperature
1.38
VCC = 5V
1.36
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
ON Pin Threshold
vs Supply Voltage
1.45
TA = 25°C
1.40
1.35
HIGH THRESHOLD
1.30
1.25 LOW THRESHOLD
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
TIMER Low Threshold
vs Supply Voltage
0.24
TA = 25°C
0.23
0.22
0.21
0.20
0.19
0.18
0.17
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 Temperature
1.45
VCC = 5V
1.40
1.35
HIGH THRESHOLD
1.30
1.25 LOW THRESHOLD
1.20
1.15
1.10
1.05
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
LTC4210 • G21
tOFF(ONLOW) vs Supply Voltage
50
45 TA = 25°C
40
35
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
tOFF(ONLOW) vs Temperature
50
45
40 vcc = 5v
35
30
25 vcc = 3v
20
15
10
5
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
LTC4210 • G23
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LTC4210-3/LTC4210-4
APPLICATIO S I FOR ATIO
GATE ramp up. If the RSENSE current is below the current
limit, the GATE ramps at a constant rate of:
∆VGATE = IGATE
∆T CGATE
(6)
where CGATE is the total capacitance at the GATE pin.
The current through RSENSE can be divided into two
components; ICLOAD due to the total load capacitance
(CLOAD) and ILOAD due to the noncapacitive load elements.
The capacitive load typically dominates.
For a successful start-up without current limit, IRSENSE <
ILIMIT:
IRSENSE = ICLOAD + ILOAD < ILIMIT
IRSENSE
=
⎛
⎝⎜
CLOAD
•
∆VOUT
∆T
⎞
⎠⎟
+
ILOAD
< ILIMIT
(7)
Due to the voltage follower configuration, the VOUT ramp
rate approximately tracks VGATE:
∆VOUT
∆T
=
ICLOAD
CLOAD
≈
∆VGATE
∆T
=
IGATE
CGATE
(8)
At time point 6, VOUT is approximately VIN but GATE ramp-
up continues until it reaches a maximum voltage. This
maximum voltage is determined either by the charge
pump or the internal clamp.
Gate Start-Up Time
The start-up time without current limit is given by:
tSTARTUP
=
CGATE
•
VTH + VIN
IGATE
tSTARTUP
=
CGATE
•
VTH
IGATE
+ CGATE
•
VIN
IGATE
(10)
12
>2.5V
VIN
3 4 5 5A 5B 6
7
>1.3V
VON
VTIMER
VGATE
VOUT
IRSENSE
RESET
MODE
COMP2
100µA 60µA
2µA
COMP1
100µA
5µA 10µA
<10µA
10µA
VTH
DISCHARGE
BY LOAD
REGULATED AT 50mV/RSENSE
INITIAL
CYCLE
START-UP
CYCLE
NORMAL
CYCLE
4210 F04
Figure 4. Operating Sequence with
Current Limiting at Start-Up Cycle
Start-Up Cycle With Current Limit
If the duration of the current limit is brief during start-up
(Figure 4) and it did not last beyond the circuit breaker
function time out, the GATE behaves the same as in start-
up without current limit except for the time interval be-
tween time point 5A and time point 5B. The servo amplifier
limits IRSENSE by decreasing the IGATE current (<10µA).
IRSENSE
=
ILIMIT
=
50mV
RSENSE
(9)
Equations 7 and 8 are applicable but with a lower GATE and
VOUT ramp rate.
During current limiting, the second term in Equation 10 is
partly modified from CGATE • VIN/IGATE to CLOAD •
VIN/ICLOAD. The start-up time is now given by:
tSTARTUP
= CGATE
• VTH
IGATE
+ CLOAD
•
VIN
ICLOAD
(11)
= CGATE
• VTH
IGATE
+ CLOAD
•
VIN
IRSENSE – ILOAD
For successful completion of current limit start-up cycle
there must be a net current to charge CLOAD and the
current limit duration must be less than tCBDELAY. The
second term in Equation 11 has to fulfill Equation 12.
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC4210-4.PDF ] | |
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