Datasheet

4
LT1111
1111fd
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
TEMPERATURE (°C)
ON TIME (µs)
–50 –25 0 25
LT111 • TPC03
50 75 100
125
10
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
Oscillator Frequency Oscillator Frequency Switch ON Time
TEMPERATURE (°C)
–50
40
OSCILLATOR FREQUENCY (KHz)
50
60
70
80
90
100
–25 0
25
50
LT1111 • TPC01
75
100
125
INPUT VOLTAGE (V)
0
69
FREQUENCY (KHz)
70
71
72
73
74
75
36
912
LT1111 • TPC02
15 18 21
68
67
24
27
30
Saturation Voltage Saturation Voltage
Duty Cycle Step-Up Mode Step-Up Mode
TEMPERATURE (°C)
DUTY CYCLE (%)
–50 –25 0 25
LT1111 • TPC04
50 75 100
125
60
58
56
54
52
50
48
46
44
42
40
SWITCH CURRENT (A)
SATURATION VOLTAGE (V)
0 0.2
0.4 0.6
LT1111 • TPC06
0.8
1.0
1.2
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.4
V
IN
= 3V
V
IN
= 2V
V
IN
= 5V
TEMPERATURE (°C)
SATURATION VOLTAGE (V)
–50 – 25 0 25
LT1111 • TPC05
50 75 100
125
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
IN
= 3V
I
SW
=
650mA
Switch ON Voltage Switch ON Voltage Minimum/Maximum Frequency
Step-Down Mode Step-Down Mode vs ON Time
SWITCH CURRENT (A)
ON VOLTAGE (V)
0 0.2 0.4 0.6
LT1111 • TPC08
0.8 1.0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
V
IN
= 12V
TEMPERATURE (°C)
ON VOLTAGE (V)
–50 –25 0 25
LT1111 • TPC07
50 75 100
2.00
1.75
1.50
1.25
1.00
0.75
0.50
125
V
IN
= 12V
I
SW
=
650mA
SWITCH ON TIME (µs)
OSCILLATOR FREQUENCY (KHz)
4
567
LT1111 • TPC09
89
100
90
80
70
60
50
40
10 11 12
–55°C ≤ T
A
≤ 125°C
0°C ≤ T
A
≤ 70°C