LT1111
TYPICAL PERFOR A CE CHARACTERISTICS
Oscillator Frequency
100
75
74
73
OSCILLATOR FREQUENCY (KHz)
90
80
70
60
50
40
–50
FREQUENCY (KHz)
ON TIME (µs)
–25
25
75
0
50
TEMPERATURE (°C)
Duty Cycle
60
58
1.0
0.9
SATURATION VOLTAGE (V)
SATURATION VOLTAGE (V)
56
DUTY CYCLE (%)
54
52
50
48
46
44
42
40
–50
–25
50
75
0
25
TEMPERATURE (°C)
100
125
Switch ON Voltage
Step-Down Mode
2.00
1.75
V
IN
= 12V
I
SW =
650mA
OSCILLATOR FREQUENCY (KHz)
ON VOLTAGE (V)
ON VOLTAGE (V)
1.50
1.25
1.00
0.75
0.50
–50
–25
50
75
0
25
TEMPERATURE (°C)
4
U W
100
LT1111 • TPC01
Oscillator Frequency
10
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
Switch ON Time
72
71
70
69
68
67
5.5
125
0
3
6
9 12 15 18 21 24 27 30
INPUT VOLTAGE (V)
LT1111 • TPC02
5.0
–50
–25
50
75
0
25
TEMPERATURE (°C)
100
125
LT111 • TPC03
Saturation Voltage
Step-Up Mode
1.4
V
IN
= 3V
I
SW =
650mA
Saturation Voltage
Step-Up Mode
V
IN
= 3V
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0.2
0.4 0.6 0.8 1.0 1.2
SWITCH CURRENT (A)
1.4
1.6
V
IN
= 2V
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–50
– 25
50
75
0
25
TEMPERATURE (°C)
100
125
V
IN
= 5V
LT1111 • TPC04
LT1111 • TPC05
LT1111 • TPC06
Switch ON Voltage
Step-Down Mode
1.4
V
IN
= 12V
1.2
1.0
0.8
0.6
0.4
0.2
0
100
125
100
90
Minimum/Maximum Frequency
vs ON Time
0°C
≤
T
A
≤
70°C
80
70
60
50
–55°C
≤
T
A
≤
125°C
40
4
5
8
9
6
7
10
SWITCH ON TIME (µs)
11
12
0
0.2
0.8
0.4
0.6
SWITCH CURRENT (A)
1.0
LT1111 • TPC07
LT1111 • TPC08
LT1111 • TPC09
1111fd
LINER [ LINEAR TECHNOLOGY ]
