Swap Controllers. LT1641-2 Datasheet

LT1641-2 Controllers. Datasheet pdf. Equivalent

Part LT1641-2
Description Positive High Voltage Hot Swap Controllers
Feature LT1641-1/LT1641-2 Positive High Voltage Hot Swap Controllers U U FEATURES ■ Allows Safe Board Inse.
Manufacture Linear Technology
Datasheet
Download LT1641-2 Datasheet

LT1641-1/LT1641-2 Positive High Voltage Hot Swap Controllers LT1641-2 Datasheet
Recommendation Recommendation Datasheet LT1641-2 Datasheet




LT1641-2
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
0.01
Q1
IRF530
R1
49.9k
1%
D1
R5 CMPZ
105248B
5%
C1
R6, 10nF
1k, 5%
*SMAT70A
R2
3.4k
1%
VCC
ON
SENSE GATE
LT1641-1/LT1641-2
FB
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
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LT1641-2
LT1641-1/LT1641-2
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (VCC) ...............................– 0.3V to 100V
Input Voltage (SENSE) .............................– 0.3V to 100V
Input Voltage (TIMER) ...............................– 0.3V to 44V
Input Voltage (FB, ON) ...............................– 0.3V to 60V
Output Voltage (PWRGD) ........................– 0.3V to 100V
Output Voltage (GATE) ............................– 0.3V to 100V
Operating Temperature Range
LT1641-1C, LT1641-2C ........................... 0°C to 70°C
LT1641-1I, LT1641-2I ........................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ON 1
FB 2
PWRGD 3
GND 4
8 VCC
7 SENSE
6 GATE
5 TIMER
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 110°C/W
ORDER PART NUMBER S8 PART MARKING
LT1641-1CS8
LT1641-1IS8
LT1641-2CS8
LT1641-2IS8
16411
16411I
16412
16412I
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
DC ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Vcc = 24V
SYMBOL
VCC
ICC
VLKO
VFBH
VFBL
VFBHST
IINFB
VFB
VSENSETRIP
IGATEUP
IGATEDN
VGATE
ITIMERUP
ITIMERON
VONH
VONL
VONHYST
IINON
VOL
IOH
PARAMETER
VCC Operating Range
VCC Supply Current
VCC Undervoltage Lockout
FB Pin High Voltage Threshold
FB Pin Low Voltage Threshold
FB Pin Hysteresis Voltage
FB Pin Input Current
FB Pin Threshold Line Regulation
SENSE Pin Trip Voltage (VCC – VSENSE)
GATE Pin Pull-Up Current
GATE Pin Pull-Down Current
External N-Channel Gate Drive
TIMER Pin Pull-Up Current
TIMER Pin Pull-Down Current
ON Pin High Threshold
ON Pin Low Threshold
ON Pin Hysteresis
ON Pin Input Current
PWRGD Output Low Voltage
PWRGD Pin Leakage Current
CONDITIONS
ON = 3V
FB Low to High Transition
FB High to Low Transition
VFB = GND
9V VCC 80V
VFB = 0V
VFB = 1V
Charge Pump On, VGATE = 7V
Any Fault Condition, VGATE = 2V
VGATE – VCC, VCC = 10.8V to 20V
VCC = 20V to 80V
VTIMER = 0V
VTIMER = 1V
ON Low to High Transition
ON High to Low Transition
VON = GND
IO = 2mA
IO = 4mA
VPWRGD = 80V
MIN
9
7.5
1.280
1.221
8
39
–5
35
4.5
10
– 24
1.5
1.280
1.221
TYP
2
8.3
1.313
1.233
80
12
47
– 10
70
– 80
3
1.313
1.233
80
MAX
80
5.5
8.8
1.345
1.245
–1
0.05
17
55
– 20
100
18
18
– 132
5
1.345
1.245
–1
0.4
2.5
10
UNITS
V
mA
V
V
V
mV
µA
mV/V
mV
mV
µA
mA
V
V
µA
µA
V
V
mV
µA
V
V
µA
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