Datasheet

LTC1921
3
1921f
Supply Current vs Supply Voltage
Undervoltage Threshold
vs TemperatureSupply Current vs Temperature
Undervoltage Recovery Threshold
vs Temperature
Overvoltage Threshold
vs Temperature
Overvoltage Hysteresis
vs Temperature
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Transient voltage for less than 10µs. This parameter is not 100%
tested. Voltage should not exceed 200V between any two pins.
Note 3: The LTC1921C and LTC1921I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
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.
Note 4: The LTC1921C is guaranteed to meet specified performance from
0°C to 70°C. The LTC1921C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LTC1921I is guaranteed to meet
specified performance from –40 t0 85°C.
Note 5: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to RTN unless otherwise
specified.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Switch Off Leakage 500 pA
Output Switch Resistance in Undervoltage Lockout, V
A
= V
B
= –10V, I
OUT
= 10mA ● 60 Ω
OUT F, OUT A, OUT B V
A
= –10V, V
B
= 0V, I
OUT
= 10mA ● 80 Ω
V
A
= 0V, V
B
= –10V, I
OUT
= 10mA ● 80 Ω
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
UW
SUPPLY VOLTAGE (V)
0
SUPPLY CURRENT (µA)
400
350
300
250
200
150
100
50
0
80
1921 G01
20 40 60 1007010 30 50 90
V
A
= V
B
= V
FUSEA
= V
FUSEB
TEMPERATURE (°C)
–50
SUPPLY CURRENT (µA)
100
I
A
+ I
B
I
A
, I
B
120
140
90
1921 G02
80
60
0
–30 –10 10 30 50 70
40
20
180
160
V
A
= –48V
V
B
= –48V
V
FUSEA
= –48V
V
FUSEB
= –48V
TEMPERATURE (°C)
UNDERVOLTAGE THRESHOLD (V)
1921 G04
–37.5
–37.7
–37.9
–38.1
–38.3
–38.5
–38.7
–38.9
–39.1
–39.3
–39.5
–50 –30 –10 10
30 50 70
90
TEMPERATURE (°C)
–50 –30 –10 10
UNDERVOLTAGE RECOVERY THRESHOLD (V)
30 50 70
90
1921 G04
–42.5
–42.6
–42.7
–42.8
–42.9
–43.0
–43.1
–43.2
–43.3
–43.4
–43.5
TEMPERATURE (°C)
OVERVOLTAGE THRESHOLD (V)
1921 G05
–68.0
–68.5
–69.0
–69.5
–70.0
–70.5
–71.0
–71.5
–72.0
–50 –30 –10 10
30 50 70
90
TEMPERATURE (°C)
OVERVOLTAGE HYSTERESIS (V)
1921 G06
1.50
1.45
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
–50 –30 –10 10
30 50 70
90