LTC4211CS8#TR Linear Technology, LTC4211CS8#TR Datasheet - Page 26
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LTC4211CS8#TR
Manufacturer Part Number
LTC4211CS8#TR
Description
IC CONTROLLER HOT SWAP 8-SOIC
Manufacturer
Linear Technology
Type
Hot-Swap Controllerr
Datasheet
1.LTC4211IMS8PBF.pdf
(36 pages)
Specifications of LTC4211CS8#TR
Applications
General Purpose
Internal Switch(s)
No
Voltage - Supply
2.5 V ~ 16.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Linear Misc Type
Positive Low Voltage
Family Name
LTC4211
Package Type
SOIC N
Operating Supply Voltage (min)
2.5V
Operating Supply Voltage (max)
16.5V
Operating Temperature (min)
0C
Operating Temperature (max)
70C
Operating Temperature Classification
Commercial
Product Depth (mm)
3.99mm
Product Height (mm)
1.5mm
Product Length (mm)
5mm
Mounting
Surface Mount
Pin Count
8
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
LTC4211CS8TR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
APPLICATIO S I FOR ATIO
LTC4211
26
12V Hot Swap Application
Figure 17 shows a 12V, 3A hot swap application circuit.
The resistor divider R1/R2 programs the undervoltage
lockout externally and allows the system to start up after
V
monitors V
above 10.54V. Transient voltage suppressor Z1 and snub-
ber network (C
the 12V applications system from ringing and voltage
spikes. R
minimize high frequency parasitic oscillations in the power
MOSFET.
AUTORETRY AFTER A FAULT
To configure the LTC4211 to automatically retry after a
fault condition, the FAULT and ON pins can be connected
to a pull-up resistor (R
CC
increases above 9.46V. The resistor divider R3/R4
G
OUT
is recommended for V
GND
RESET
and signals the RESET pin when V
X
, R
V
5V
CC
X
U
CONNECTOR
BACKPLANE
) are highly recommended to protect
(FEMALE)
GND
12V
V
AUTO
CC
U
CONNECTOR
CONNECTOR
BACKPLANE
PCB EDGE
) to the supply, as shown in
(FEMALE)
(MALE)
LONG
R
SHORT
LONG
PULL-UP
W
CONNECTOR
CC
PCB EDGE
C
10k
(MALE)
AUTO
1µF
> 10V and it can
Figure 18. LTC4211MS Autoretry Application
LONG
SHORT
LONG
Z1 = 1SMA12A OR SMAJ12A
** HIGHLY RECOMMENDED
R
(SEE NOTE)
Figure 17. 12V Hot Swap Application
AUTO
PCB CONNECTION SENSE
C
C
100pF
U
TIMER
FILTER
10nF
61.9k
Z1**
OUT
R1
R
10Ω
goes
R2
10k
R3
10Ω
X
C
100nF
C1
0.1µF
X
5
1
2
3
4
Z1 = 1SMA10A OR SMAJ10A
* OPTIONAL
2
RESET
ON
FILTER
TIMER
GND
LTC4211MS
ON
V
CC
TIMER
8
0.012Ω
R
SENSE
Figure 18. In this case, the autoretry circuitry will attempt
to restart the LTC4211 with a 50% duty cycle, as shown in
the timing diagram of Figure 19. To prevent overheating
the external MOSFET and other components during the
autoretry sequence, adding a capacitor (C
circuit introduces an RC time constant (t
the autoretry duty cycle. Equation 14 gives the autoretry
duty cycle, modified by this external time constant:
where t
tion) and t
from 0V to the ON pin threshold (1.316V).
For the values shown, the external RC time constant is set
at 1 second, the t
autoretry duty cycle drops from 50% to 2.5%.
FAULT
SENSE
GATE
3
V
Z1*
CC
FB
Autoretry Duty Cycle
SENSE
LTC4211
C
8.2nF
TIMER
10
9
8
7
6
7
GND
TIMER
Si4410DY
4
R
0.007Ω
6
GATE
SENSE
M1
RESET
OFF
R
100Ω
FB
G
= LTC4211 system timing(see TIMER func-
is a time needed to charge capacitor C
5
1
4211 F18
Si4410DY
R3
93.1k
R4
12.4k
+
Q1
TIMER
C
LOAD
NOTE:
Q1 MOUNTED TO 300mm
R
DUTY CYCLE AND Q1 T
R
DUTY CYCLE AND Q1 T
AUTO
AUTO
R1
36k
R2
15k
≈
R5
10k
= 1M YIELDS 2.5%
= 3.2M YIELDS 0.8%
+
t
delay equals 6.2ms and the
OFF
RESET
LOGIC
4211 F17
µP
C
V
5V
5A
LOAD
OUT
+ 2
t
V
12V
3A
GND
TIMER
OUT
CASE
CASE
•
2
COPPER AREA
t
= 50°C
= 37°C
TIMER
OFF
) that adjusts
•
AUTO
100
) to the
%
AUTO
(14)
4211fa