LT1641-1 データシートの表示（PDF） - Linear Technology
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LT1641-1 Datasheet PDF : 12 Pages
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LT1641-1/LT1641-2
Positive High Voltage
Hot Swap Controllers
FEATURES
■ Allows Safe Board Insertion and Removal from a
Live Backplane
■ Controls Supply Voltage from 9V to 80V
■ Programmable Analog Foldback Current Limiting
■ High Side Drive for an External N-Channel
■ Latched Operation Mode (LT1641-1)
■ Automatic Retry (LT1641-2)
■ User Programmable Supply Voltage Power-Up Rate
■ Undervoltage Lockout
■ Overvoltage Protection
■ Both are available in 8-Lead SO Package
U
APPLICATIO S
■ Hot Board Insertion
■ Electronic Circuit Breaker
■ Industrial High Side Switch/Circuit Breaker
■ 24V/48V Industrial/Alarm Systems
DESCRIPTIO
The LT®1641-1/LT1641-2 are 8-pin Hot SwapTM control-
lers that allow a board to be safely inserted and removed
from a live backplane. Using an external N-channel pass
transistor, the board supply voltage can be ramped up at
a programmable rate. A high side switch driver controls an
N-channel gate for supply voltages ranging from 9V to
80V.
The chips feature a programmable analog foldback cur-
rent limit circuit. If the chips remain in current limit for
more than a programmable time, the N-channel pass
transistor is either latched off (LT1641-1) or is set to
automatically restart after a time-out delay (LT1641-2).
The PWRGD output indicates when the output voltage,
sensed by the FB pin, is within tolerance. The ON pin
provides programmable undervoltage lockout.
The LT1641-1/LT1641-2 are available in the 8-lead SO
package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
VIN
24V
SHORT
PIN
24V Input Voltage Application
RS
0.01Ω
Q1
IRF530
R1
49.9k
1%
D1
R5
CMPZ
10Ω
5248B
5%
C1
R6, 10nF
1k, 5%
*SMAT70A
R2
3.4k
1%
VCC SENSE GATE
ON
FB
LT1641-1/LT1641-2
TIMER
PWRGD
GND
VOUT
R3
CL
59k
1%
R7
24k
5%
R4
3.57k
1%
PWRGD
GND
*DIODES, INC.
C2
0.68µF
1641-1 TA01
164112fc
1
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