LT1641-1/LT1641-2
Positive High Voltage
Hot Swap Controllers
DESCRIPTIO
FEATURES
TM
Allows Safe Board Insertion and Removal from a The LT 1641-1/LT1641-2 are 8-pin Hot Swap control-
Live Backplane lers that allow a board to be safely inserted and removed
Controls Supply Voltage from 9V to 80V from a live backplane. Using an external N-channel pass
Programmable Analog Foldback Current Limiting transistor, the board supply voltage can be ramped up at
High Side Drive for an External N-Channel a programmable rate. A high side switch driver controls an
Latched Operation Mode (LT1641-1) N-channel gate for supply voltages ranging from 9V to
Automatic Retry (LT1641-2) 80V.
User Programmable Supply Voltage Power-Up Rate
The chips feature a programmable analog foldback cur-
Undervoltage Lockout
rent limit circuit. If the chips remain in current limit for
Overvoltage Protection
more than a programmable time, the N-channel pass
Both are available in 8-Lead SO Package
transistor is either latched off (LT1641-1) or is set to
U
automatically restart after a time-out delay (LT1641-2).
APPLICATIO S
The PWRGD output indicates when the output voltage,
Hot Board Insertion
sensed by the FB pin, is within tolerance. The ON pin
Electronic Circuit Breaker
provides programmable undervoltage lockout.
Industrial High Side Switch/Circuit Breaker
The LT1641-1/LT1641-2 are available in the 8-lead SO
24V/48V Industrial/Alarm Systems
package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
24V Input Voltage Application
R Q1
S
0.01 IRF530
V
IN
V
OUT
24V
D1
C
L
CMPZ
R1 R5 R3
SHORT
5248B
49.9k 10 59k
PIN
1% 5% 1%
C1
R6,
10nF
1k, 5%
R7
24k
V SENSE GATE 5%
CC
*SMAT70A
ON FB
R4
3.57k
LT1641-1/LT1641-2
1%
R2
3.4k
1%
PWRGD PWRGD
TIMER GND
C2
0.68F
GND
*DIODES, INC. 1641-1 TA01
164112fc
1
U
ULT1641-1/LT1641-2
UUW
ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO
(Note 1)
TOP VIEW
Supply Voltage (V ) ...............................0.3V to 100V
CC
ON 1 8 V
CC
Input Voltage (SENSE).............................0.3V to 100V
FB 2 7 SENSE
Input Voltage (TIMER) ...............................0.3V to 44V
PWRGD GATE
3 6
Input Voltage (FB, ON)...............................0.3V to 60V
GND 4 5 TIMER
Output Voltage (PWRGD) ........................0.3V to 100V
S8 PACKAGE
8-LEAD PLASTIC SO
Output Voltage (GATE) ............................0.3V to 100V
T = 125C, = 110C/W
JMAX JA
Operating Temperature Range
ORDER PART NUMBER S8 PART MARKING
LT1641-1C, LT1641-2C ........................... 0C to 70C
LT1641-1CS8 16411
LT1641-1I, LT1641-2I ........................ 40C to 85C
LT1641-1IS8 16411I
Storage Temperature Range ................. 65C to 150C
LT1641-2CS8 16412
Lead Temperature (Soldering, 10 sec).................. 300C
LT1641-2IS8 16412I
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: