LTC4251B-2_15 Datasheet, PDF (3/24 Pages) Linear Technology – Negative Voltage Hot Swap Controllers in SOT-23

LTC4251B/LTC4251B-1/
LTC4251B-2
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_GATEL
V_UVHI
Gate Low Threshold
UV Threshold High
(Before Gate Ramp-Up)
LTC4251B/LTC4251B-2
LTC4251B-1
0.5
V
l 3.075 3.225 3.375
V
l 2.300 2.420 2.540
V
V_UVLO UV Threshold Low
LTC4251B/LTC4251B-2
LTC4251B-1
l 2.775 2.925 3.075
V
l 2.050 2.160 2.270
V
V_UVHST UV Hysteresis
LTC4251B/LTC4251B-2
LTC4251B-1
0.30
V
0.26
V
V_OVHI OV Threshold High
LTC4251B
LTC4251B-1
l 5.85 6.15 6.45
V
l 5.86 6.17 6.48
V
V_OVLO OV Threshold Low
LTC4251B
LTC4251B-1
l 5.25 5.55 5.85
V
l 5.61 5.91 6.21
V
V_OVHST OV Hysteresis
LTC4251B
LTC4251B-1
0.60
V
0.26
V
I_SENSE
I_INP
V_TMRH
V_TMRL
SENSE Input Current
UV/OV Input Current
Timer Voltage High Threshold
Timer Voltage Low Threshold
UV/OV = 4V, V_SENSE = 50mV
UV/OV = 4V
l –30 –15
μA
l
±0.1 ±1
μA
4
V
1
V
I_TMR
Timer Current
t_PLLUG
t_PHLOG
UV Low to GATE Low
OV High to GATE Low
Timer On (Initial Cycle, Sourcing), V_TMR = 2V
Timer Off (Initial Cycle, Sinking), V_TMR = 2V
Timer On (Circuit Breaker, Sourcing), V_TMR = 2V
Timer Off (Cooling Cycle, Sinking), V_TMR = 2V
LTC4251B/LTC4251B-1
5.8
μA
28
mA
230
μA
5.8
μA
0.7
μs
1
μs
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to V_EE unless otherwise
specified.
Note 3: UV/OV = 4V refers to UV = 4V for the LTC4251B-2.
TYPICAL PERFORMANCE CHARACTERISTICS UV/OV = 4V refers to UV = 4V for the LTC4251B-2.
I_IN vs Temperature
2000
V_IN = (V_Z – 0.3V)
1800
1600
1400
1200
1000
800
600
400
200
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4251b12 G01
I_IN vs V_IN
1000
100
10
1
T_A = –40°C
T_A = 25°C
T_A = 85°C
T_A = 125°C
0.1
0 2 4 6 8 10 12 14 16 18 20 22
V_IN (V)
4251b12 G02
r_Z vs Temperature
10
I_IN = 2mA
9
8
7
6
5
4
3
2
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4251b12 G03
4251b12f
3