Datasheet
LTC1921
2
1921f
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1) All voltages referred to RTN
Supply Voltage
(V
A
, V
B
, FUSE A, FUSE B) ....................... 100V to –100V
Transient Voltage (V
A
, V
B
, FUSE A, FUSE B)
(Note 2) ........................................................ 0V to 200V
Transient Voltage (V
A
, V
B
, FUSE A, FUSE B)
(Note 2) ......................................................0V to –200V
OUT A, OUT B, OUT F Pins ......................... 0.3V to –8V
ORDER PART
NUMBER
LTC1921CMS8
LTC1921IMS8
T
JMAX
= 150°C, θ
JA
= 300°C/W
MS8 PART MARKING
LTZV
LTZU
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5) RTN = 0V, V
A
= –48V, V
B
= –48V, FUSE A = –48V,
FUSE B = –48V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply
Supply Voltage Range (RTN – V
A
, RTN –␣ V
B
) ● 10 80 V
Supply Current (I
A
+ I
B
) –160 –250 µA
● –300 µA
Supply Monitor
Undervoltage Threshold ● –39.5 –37.5 V
Undervoltage Recovery Threshold ● –43.5 –42.5 V
Overvoltage Threshold ● –71.5 –68.5 V
Overvoltage Threshold Hysteresis ● 1 1.6 V
Fuse Monitor
Input Resistance, FUSE A, FUSE B 11 MΩ
Fuse Comparison Threshold |V
FUSEA
– V
A
|, |V
FUSEB
– V
B
| V
LTC1921C ● 0.9 4.5 V
LTC1921I
● 0.5 4.5 V
Output
Propagation Delay C
OUT
= 100pF, Overdrive = 1V 220 µs
Output Switch Resistance, OUT F, OUT A, OUT B V
A
= V
B
= –35V, V
FUSEA
= V
FUSEB
= 0V 25 Ω
I
OUT
= 10mA ● 50 Ω
Maximum Junction Temperature ......................... 150°C
Operating Temperature Range (Note 3)
LTC1921C/LTC1921I .......................... –40°C to 85°C
Specified Temperature Range (Note 4)
LTC1921C/LTC1921I .......................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
ORDER PART
NUMBER
LTC1921CS8
LTC1921IS8
S8 PART MARKING
1921
1921I
ELECTRICAL CHARACTERISTICS
1
2
3
4
V
A
FUSE A
RTN
OUT F
8
7
6
5
V
B
FUSE B
OUT B
OUT A
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
1
2
3
4
8
7
6
5
TOP VIEW
V
B
FUSE B
OUT B
OUT A
V
A
FUSE A
RTN
OUT F
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C, θ
JA
= 190°C/W