2
LT1641
1641fd
Supply Voltage (V
CC
) ...............................–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
LT1641CS8 ............................................. 0°C to 70°C
LT1641IS8.......................................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
cc
= 24V
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
V
CC
Operating Range ● 980V
I
CC
V
CC
Supply Current ON = 3V ● 2 5.5 mA
V
LKO
V
CC
Undervoltage Lockout ● 7.5 8.3 8.8 V
V
FBH
FB Pin High Voltage Threshold FB Low to High Transition ● 1.280 1.313 1.345 V
V
FBL
FB Pin Low Voltage Threshold FB High to Low Transition ● 1.221 1.233 1.245 V
V
FBHST
FB Pin Hysteresis Voltage 80 mV
I
INFB
FB Pin Input Current V
FB
= GND –1 µA
∆V
FB
FB Pin Threshold Line Regulation 9V ≤ V
CC
≤ 80V ● 0.05 mV/V
V
SENSETRIP
SENSE Pin Trip Voltage (V
CC
– V
SENSE
)V
FB
= 0V ● 81217 mV
V
FB
= 1V ● 39 47 55 mV
I
GATEUP
GATE Pin Pull-Up Current Charge Pump On, V
GATE
= 7V ● –5 –10 –20 µA
I
GATEDN
GATE Pin Pull-Down Current Any Fault Condition, V
GATE
= 2V ● 35 70 100 mA
∆V
GATE
External N-Channel Gate Drive V
GATE
– V
CC
, V
CC
= 10.8V to 20V ● 4.5 18 V
V
CC
= 20V to 80V ● 10 18 V
I
TIMERUP
TIMER Pin Pull-Up Current V
TIMER
= 0V ● – 24 – 80 –132 µA
I
TIMERON
TIMER Pin Pull-Down Current V
TIMER
= 1V ● 1.5 3 5 µA
V
ONH
ON Pin High Threshold ON Low to High Transition ● 1.280 1.313 1.345 V
V
ONL
ON Pin Low Threshold ON High to Low Transition ● 1.221 1.233 1.245 V
V
ONHYST
ON Pin Hysteresis 80 mV
I
INON
ON Pin Input Current V
ON
= GND –1 µA
V
OL
PWRGD Output Low Voltage I
O
= 2mA ● 0.4 V
I
O
= 4mA ● 2.5 V
I
OH
PWRGD Pin Leakage Current V
PWRGD
= 80V ● 10 µA
DC ELECTRICAL CHARACTERISTICS
T
JMAX
= 125°C, θ
JA
= 110°C/W
1641
1641I
LT1641CS8
LT1641IS8
1
2
3
4
8
7
6
5
TOP VIEW
V
CC
SENSE
GATE
TIMER
ON
FB
PWRGD
GND
S8 PACKAGE
8-LEAD PLASTIC SO
NOT RECOMMENDED FOR NEW DESIGNS
SEE LT1641-1/LT1641-2
ORDER PART NUMBER
S8 PART MARKING
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
