LT1107 Datasheet, PDF (4/12 Pages) Linear Technology – Micropower DC/DC Converter Adjustable and Fixed 5V, 12V

LT1107
TYPICAL PERFOR A CE CHARACTERISTICS
Saturation Voltage, Step-Up Mode
(SW2 Pin Grounded)
1.2
1.0
V_IN = 3V
0.8
V_IN = 2V
V_IN = 5V
0.6
0.4
0.2
0
0 0.2 0.4 0.6 0.8 1.0 1.2
SWITCH CURRENT (A)
1107 G01
Quiescent Current
400
350
300
250
200
150
100
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1107 G05
Switch ON Time
Step-Up Mode
16
15
14
13
12
11
10
9
8
7
6
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1107 G08
Switch ON Voltage, Step-Down
Mode (SW1 Pin Connected to V_IN)
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
SWITCH CURRENT (A)
1107 G02
Quiescent Current
400
380 ^{TA = 25°C}
360
340
320
300
280
260
240
220
200
0 3 6 9 12 15 18 21 24 27 30
INPUT VOLTAGE (V)
1107 G06
Duty Cycle
Step-Up Mode
85
80
75
70
65
60
55
50
45
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1107 G09
Maximum Switch Current vs R_LIM
1.5
1.4
1.3
1.2
1.1
1.0
STEP-UP
0.9
2V ≤ V_IN ≤ 5V
0.8
0.7
0.6
STEP-DOWN
0.5
0.4
V_IN = 12V
0.3
0.2
0.1
10
100
1000
R_LIM (Ω)
1107 G03
Oscillator Frequency
100
90
80
70
60
50
40
30
20
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1107 G07
Switch ON Time
Step-Down Mode
13
12
11
10
9
8
7
6
5
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1107 G10
4