LT1111 Datasheet, PDF (4/16 Pages) Linear Technology – Micropower DC/DC Converter Adjustable and Fixed 5V, 12V

LT1111
TYPICAL PERFOR A CE CHARACTERISTICS
Oscillator Frequency
100
90
80
70
60
50
40
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LT1111 • TPC01
Duty Cycle
60
58
56
54
52
50
48
46
44
42
40
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LT1111 • TPC04
Switch ON Voltage
Step-Down Mode
2.00
V_IN = 12V
1.75 ^{ISW = 650mA}
1.50
1.25
1.00
0.75
0.50
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LT1111 • TPC07
Oscillator Frequency
75
74
73
72
71
70
69
68
67
0 3 6 9 12 15 18 21 24 27 30
INPUT VOLTAGE (V)
LT1111 • TPC02
Saturation Voltage
Step-Up Mode
1.0
0.9
V_IN = 3V
I_SW = 650mA
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–50 – 25
0 25 50 75 100 125
TEMPERATURE (°C)
LT1111 • TPC05
Switch ON Voltage
Step-Down Mode
1.4
V_IN = 12V
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0.2
0.4
0.6
0.8
1.0
SWITCH CURRENT (A)
LT1111 • TPC08
Switch ON Time
10
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LT111 • TPC03
Saturation Voltage
Step-Up Mode
1.4
1.2
V_IN = 2V
1.0
V_IN = 3V
0.8
V_IN = 5V
0.6
0.4
0.2
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
SWITCH CURRENT (A)
LT1111 • TPC06
Minimum/Maximum Frequency
vs ON Time
100
90
0°C ≤ T_A ≤ 70°C
80
70
60
50
–55°C ≤ T_A ≤ 125°C
40
45678
9 10 11 12
SWITCH ON TIME (µs)
LT1111 • TPC09
4