Datasheet

4
LTC1643AL
LTC1643AL-1/LTC1643AH
1643afb
TYPICAL PERFORMANCE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
TIMER CURRENT (µA)
100
1643A G04
050
23.5
23.0
22.5
22.0
21.5
21.0
20.5
20.0
19.5
–25 25 75 125
Timer Current vs Temperature
TEMPERATURE (°C)
–50
GATE I
SINK
(mA)
25.0
22.5
20.0
17.5
15.0
12.5
10.0
25 75
1643A G05
–25 0
50 100 125
FAULT = LOW
Gate I
SINK
vs Temperature
TEMPERATURE (°C)
–50
GATE CURRENT (µA)
90
80
70
60
50
40
0
50
75
1643A G06
–25
25
100
125
Gate Current vs Temperature
Power Good Threshold Voltage vs
Temperature (12V
OUT
)
TEMPERATURE (°C)
–50
POWER GOOD THRESHOLD VOLTAGE (V)
11.14
11.12
11.10
11.08
11.06
11.04
0
50
75
1643A G07
–25
25
100
125
Power Good Threshold Voltage vs
Temperature (5V
OUT
)
TEMPERATURE (°C)
–50
POWER GOOD THRESHOLD VOLTAGE (V)
4.68
4.67
4.66
4.65
4.64
4.63
4.62
25 75
1643A G08
–25 0
50 100 125
TEMPERATURE (°C)
–50
POWER GOOD THRESHOLD VOLTAGE (V)
100
1643A G09
050
2.904
2.903
2.902
2.901
2.900
2.899
2.898
2.897
2.896
–25 25 75 125
Power Good Threshold Voltage vs
Temperature (3V
OUT
)
Power Good Threshold Voltage
vs Temperature (V
EEOUT
)
TEMPERATURE (°C)
–50
POWER GOOD THRESHOLD VOLTAGE (V)
100
1643A G10
050
–10.58
–10.56
–10.54
–10.52
–10.50
–10.48
–10.46
–10.44
–10.42
–25 25 75 125
12V Internal Switch Voltage Drop
vs Temperature
TEMPERATURE (°C)
325
300
275
250
225
200
175
150
LT1643A G11
INTERNAL SWITCH VOLTAGE DROP (mV)
–50 25 75
–25 0
50 100 125
I
12VOUT
= 500mA
V
EE
Internal Switch Voltage Drop
vs Temperature
TEMPERATURE (°C)
–50
INTERNAL SWITCH VOLTAGE DROP (mV)
180
160
140
120
100
80
60
25 75
1643A G12
–25 0
50 100 125
I
VEEIN
= 100mA