640AHI View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
640AHI Datasheet PDF : 16 Pages
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FEATURES
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
U
APPLICATIO S
s Central Office Switching
s – 48V Distributed Power Systems
s Negative Power Supply Control
LT1640AL/LT1640AH
Negative Voltage
Hot Swap Controller
DESCRIPTIO
The LT®1640AL/LT1640AH are 8-pin, negative voltage
Hot SwapTM 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
GND
UV = 37V
OV = 71V
*
(SHORT PIN)
GND
R4†
562k
1%
R5†
9.09k
1%
R6†
10k
1%
3
UV
2
OV
VEE
4
SENSE
5
– 48V
R1†
3
0.02Ω
5%
4
1
2
* DIODES INC. SMAT70A
† THESE COMPONENTS ARE APPLICATION
SPECIFIC AND MUST BE SELECTED BASED
UPON OPERATING CONDITIONS AND DESIRED
PERFORMANCE. SEE APPLICATIONS
INFORMATION.
8
VDD
LT1640AL
1
PWRGD
GATE
DRAIN
6
7
C1†
150nF
25V
R2
10Ω
R3†
18k
C2†
5% 5% 3.3nF
100V
Q1
IRF530
C3 +
0.1µF
100V
C4
100µF
100V
2
1
ON/OFF
VIN+
VOUT+
SENSE +
9
8
7
+
TRIM
SENSE – 6
4 VIN–
VOUT– 5
5V
C5
100µF
16V
LUCENT
JW050A1-E
1640A TA01
Input Inrush Current
CONTACT
BOUNCE
1640A F07b
1
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