LTC1642A
TYPICAL PERFOR A CE CHARACTERISTICS
FAULT and RESET Pull-Up Current
(I
OH
) vs V
CC
160
140
PULL-UP CURRENT (µA)
120
100
80
60
40
20
0
3
6
9
V
CC
(V)
12
15
1642a G14
VOLTAGE (mV)
T
A
= –55°C
T
A
= 25°C
V
CC
= 3V
300
200
100
0
–50
V
CC
= 5V
V
CC
= 12V
V
CC
= 15V
VOLTAGE (V)
T
A
= 125°C
Current Limit Threshold Voltage
(Full Foldback) vs Temperature
CURRENT LIMIT THRESHOLD VOLTAGE (mV)
FB = 0V
27.0
26.5
V
CC
= 12V
26.0
V
CC
= 5V
25.5
V
CC
= 3V
25.0
24.5
–50
V
CC
= 15V
CURRENT LIMIT THRESHOLD VOLTAGE (mV)
27.5
ON PIN THRESHOLD VOLTAGE (V)
–25
0
25
50
75
TEMPERATURE (°C)
V
REF
vs V
CC
1.232
T
A
= 25°C
1.228
1.224
1.220
1.216
1.212
1.208
0
3
6
9
V
CC
(V)
12
15
1642a G24
10
V
ON
= 5V
∆V
REF
(mV)
V
REF
(V)
I
CC
(mA)
U W
100
FAULT and RESET V
OL
vs
Temperature
600
I
OL
= 1.54mA
500
400
FAULT and RESET V
OL
vs
Temperature
3.5
I
OL
= 5mA
3.0
2.5
2.0
1.5
1.0
0.5
0
–50
V
CC
= 3V
V
CC
= 5V
V
CC
= 12V
V
CC
= 15V
–25
0
25
50
75
TEMPERATURE (°C)
100
125
–25
0
25
50
75
TEMPERATURE (°C)
100
125
1642a G16
1642a G17
Current Limit Threshold Voltage
(Nominal) vs Temperature
57.0
FB = 1V
56.5
56.0
55.5
55.0
54.5
54.0
53.5
–50
V
CC
= 3V
–25
0
25
50
75
TEMPERATURE (°C)
100
125
V
CC
= 15V
V
CC
= 12V
V
CC
= 5V
1.36
1.40
ON Pin Threshold Voltage vs
Temperature
V
CC
= 12V
ON RISING
1.32
1.28
1.24
ON FALLING
1.20
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
125
1642a G20
1642a G21
1642a G22
I
CC
vs V
CC
20
T
A
= 25°C
Reference O/P Impedance
0
–2
–4
–6
–8
–10
–12
–14
–16
–18
–20
–22
– 42
T
A
= 25°C
V
CC
= 5V
V
CC
= 3.3V
V
CC
= 12V,
15V
V
ON
= 0V
0
25
V
CC
(V)
50
1642a G25
0
2.5
5
7.5 10 12.5 15 17.5 20
I
REF
(mA)
1642a G37
1642af
5
LINER [ LINEAR TECHNOLOGY ]
