LTC4251 Datasheet, PDF (5/20 Pages) Linear Technology – Negative Voltage Hot Swap Controllers in SOT-23

LTC4251/LTC4251-1/
LTC4251-2
TYPICAL PERFOR A CE CHARACTERISTICS _{UV/OV = 4V refers to UV = 4V for the LTC4251-2.}
V_GATE vs Temperature
14.5
UV/0V = 4V
14.0 VTMR = 0V
V_SENSE = V_EE
13.5
13.0
12.5
12.0
11.5
11.0
10.5
10.0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
425112 G13
UV Threshold vs Temperature
2.55
2.50 ^LTC4251-1
2.45
V_UVHI
2.40
2.35
2.30
2.25
2.20
V_UVLO
2.15
2.10
2.05
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
425112 G16
I_SENSE vs Temperature
–10
–12
–14
–16
–18
–20
–22
–24
–26
–28
–30
–55 –35 –15 5
UV/0V = 4V
TIMER = 0V
GATE = HIGH
V_SENSE – V_EE = 50mV
25 45 65 85 105 125
TEMPERATURE (°C)
425112 G19
V_GATEL vs Temperature
0.8
UV/0V = 4V,
0.7 ^VTMR ^{= 0V,}
GATE THRESHOLD
0.6 ^{BEFORE RAMP-UP}
0.5
0.4
0.3
0.2
0.1
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
425112 G14
OV Threshold vs Temperature
6.45
LTC4251
6.25
V_OVH
6.05
5.85
5.65
V_OVL
5.45
5.25
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
425112 G17
I_SENSE vs (V_SENSE – V_EE)
0.01
0.1
1.0
10
100
UV/0V = 4V
TIMER = 0V
GATE = HIGH
1000
T_A = 25°C
–1.5 –1.0 –0.5 0 0.5 1.0 1.5 2.0
(V_SENSE – V_EE) (V)
425112 G20
UV Threshold vs Temperature
3.375
3.275
LTC4251/LTC4251-2
V_UVH
3.175
3.075
2.975
2.875
V_UVL
2.775
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
425112 G15
OV Threshold vs Temperature
6.51
6.41 ^LTC4251-1
6.31
6.21
V_OVHI
6.11
6.01
5.91
V_OVLO
5.81
5.71
5.61
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
425112 G18
TIMER Threshold vs Temperature
5.0
4.5
V_TMRH
4.0
3.5
3.0
2.5
2.0
1.5
V_TMRL
1.0
0.5
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
425112 G21
425112fa
5