|
|
PDF LTC4210-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC4210-1 | |
| Descripción | Hot Swap Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC4210-1 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
LTC4210-1/LTC4210-2
Hot Swap Controller in
6-Lead SOT-23 Package
FEATURES
s Allows Safe Board Insertion and Removal
from a Live Backplane
s Adjustable Analog Current Limit
with Circuit Breaker
s Fast Response Limits Peak Fault Current
s Automatic Retry or Latch Off On Current Fault
s Adjustable Supply Voltage Power-Up Rate
s High Side Drive for External MOSFET Switch
s Controls Supply Voltages from 2.7V to 16.5V
s Undervoltage Lockout
s Adjustable Overvoltage Protection
s Low Profile (1mm) SOT-23 (ThinSOTTM) Package
U
APPLICATIO S
s Hot Board Insertion
s Electronic Circuit Breaker
s Industrial High Side Switch/Circuit Breaker
DESCRIPTIO
The LTC®4210 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 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.
TYPICAL APPLICATIO
Single Channel 5V Hot Swap Controller
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE) (MALE)
RSENSE
Q1
VIN
5V
LONG
0.01Ω
Si4410DY
VOUT
RX
+
5V
470µF 4A
Z1
OPTIONAL
10Ω
CX
CLOAD
0.1µF
RG
VCC SENSE
100Ω
RON1
SHORT 20k
RON2
10k
GATE
ON LTC4210
TIMER
RC
100Ω
CC
0.01µF
GND
GND
LONG
Z1: ISMA10A OR SMAJ10A
CTIMER
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
421012f
1
1 page  
www.DataSheet4U.com
TYPICAL PERFOR A CE CHARACTERISTICS
LTC4210-1/LTC4210-2
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
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 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)
4210 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)
4210 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
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 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
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 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)
4210 G21
tOFF(ONLOW) vs Supply Voltage
80
TA = 25°C
70
60
50
40
30
20
10
0
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G22
tOFF(ONLOW) vs Temperature
80
70 VCC = 15V
60
50 VCC = 12V
40
30 VCC = 5V
20
VCC = 3V
10
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G23
421012f
5
5 Page 
www.DataSheet4U.com
LTC4210-1/LTC4210-2
APPLICATIO S I FOR ATIO
Whichever method of compensation is used, board level
short-circuit testing is highly recommended as board
layout can affect transient performance. Beside frequency
compensation, the total gate capacitance CGATE also
determines the GATE start-up as in Equation 6. The CGATE
should be kept below 0.15µF at high supply operation as
the capacitive energy ( 0.5 • CGATE • VGATE2 ) is discharged
by the LTC4210 internal pull-down transistor. This pre-
vents the internal pull-down transistor from overheating
when the GATE turns off and/or is servoing during current
limiting.
Timer Function
The TIMER pin handles several key functions with an
external capacitor, CTIMER. There are two comparator
thresholds: COMP1 (0.2V) and COMP2 (1.3V). The four
timing current sources are:
5µA pull-up
60µA pull-up
2µA pull-down
100µA pull-down
The 100µA is a nonideal current source approximating a
7k resistor below 0.4V.
ends. The 100µA current source then pulls down the
TIMER pin until it reaches 0.2V at time point 4. The initial
cycle delay (time point 2 to time point 4) is related to
CTIMER by equation:
tINITIAL ≈ 272.9 • CTIMER ms/µF
(5)
When the initial cycle terminates, a start-up cycle is
activated and the GATE pin ramps high. The TIMER pin
continues to be pulled down towards ground.
12
>2.5V
VIN
34 5
6
7
VON
VTIMER
VGATE
>1.3V
5µA
COMP2
100µA
COMP1
10µA
VTH
VOUT
RESET
MODE
INITIAL START-UP NORMAL
CYCLE CYCLE
CYCLE
DISCHARGE
BY LOAD
4210 F03
Initial Timing Cycle
When the card is being inserted into the bus connector, the
long pins mate first which brings up the supply VIN at time
point 1 of Figure 3. The LTC4210 is in reset mode as the
ON pin is low. GATE is pulled low and the TIMER pin is
pulled low with a 100µA source. At time point 2, the short
pin makes contact and ON is pulled high. At this instant, a
start-up check requires that the supply voltage be above
UVLO, the ON pin be above 1.3V and the TIMER pin voltage
be less than 0.2V. When these three conditions are ful-
filled, the initial cycle begins and the TIMER pin is pulled
high with 5µA. At time point 3, the TIMER reaches the
COMP2 threshold and the first portion of the initial cycle
Figure 3. Normal Operating Sequence
Start-Up Cycle Without Current Limit
The GATE is released with a 10µA pull-up at time point 4
of Figure 3. At time point 5, GATE reaches the external
MOSFET threshold VTH and VOUT starts to follow the 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.
421012f
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC4210-1.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC4210-1 | Hot Swap Controller | Linear Technology |
| LTC4210-2 | Hot Swap Controller | Linear Technology |
| LTC4210-3 | Hot Swap Controller | Linear Technology |
| LTC4210-4 | Hot Swap Controller | Linear Technology |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |