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LT1640AHIN8 Datasheet(PDF) 1 Page - Linear Technology

Part # LT1640AHIN8
Description  Negative Voltage Hot Swap Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1640AHIN8 Datasheet(HTML) 1 Page - Linear Technology

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1
LT1640AL/LT1640AH
Negative Voltage
Hot Swap Controller
s
Allows Safe Board Insertion and Removal
from a Live – 48V Backplane
s
Operates from –10V to – 80V
s
Programmable Inrush Current
s
Allows 50mA of Reverse Drain Pin Current
s
Programmable Electronic Circuit Breaker
s
Programmable Overvoltage Protection
s
Programmable Undervoltage Lockout
s
Power Good Control Output
The LT
®1640AL/LT1640AH are 8-pin, negative voltage
Hot Swap
TM controllers that allow a board to be safely
inserted and removed from a live backplane. Inrush cur-
rent is limited to a programmable value by controlling the
gate voltage of an external N-channel pass transistor. The
pass transistor is turned off if the input voltage is less than
the programmable undervoltage threshold or greater than
the overvoltage threshold. A programmable electronic
circuit breaker protects the system against shorts. The
PWRGD (LT1640AL) or PWRGD (LT1640AH) signal can
be used to directly enable a power module. The LT1640AL
is designed for modules with a low enable input and the
LT1640AH for modules with a high enable input.
The LT1640AL/LT1640AH are available in 8-pin PDIP and
SO packages.
s
Central Office Switching
s
– 48V Distributed Power Systems
s
Negative Power Supply Control
Hot Swap is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Input Inrush Current
CONTACT
BOUNCE
1640A F07b
VEE
VDD
LT1640AL
SENSE
C1
150nF
25V
C2
3.3nF
100V
C3
0.1
µF
100V
C4
100
µF
100V
Q1
IRF530
R2
10
5%
R3
18k
5%
R4
562k
1%
R5
9.09k
1%
R6
10k
1%
R1
0.02
5%
4
OV
GND
GND
(SHORT PIN)
3
2
– 48V
OV = 71V
*
* DIODES INC. SMAT70A
THESE COMPONENTS ARE APPLICATION
SPECIFIC AND MUST BE SELECTED BASED
UPON OPERATING CONDITIONS AND DESIRED
PERFORMANCE. SEE APPLICATIONS
INFORMATION.
UV = 37V
UV
56
8
7
1
GATE
DRAIN
PWRGD
1640A TA01
VOUT
+
SENSE +
TRIM
SENSE
VOUT
VIN
ON/OFF
LUCENT
JW050A1-E
VIN
+
2
9
5V
8
7
6
5
1
4
+
C5
100
µF
16V
+
4
3
2
1
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO


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