LT1071_15 Datasheet, PDF (4/12 Pages) Linear Technology – 5A and 2.5A High Efficiency Switching Regulators

LT1070/LT1071
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Current Limit vs Duty Cycle
16
FOR LT1071, DIVIDE
14 VERTICAL SCALE BY 2
12
10
– 55°C
8
6
125°C
25°C
4
2
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
1070/71 G01
Maximum Duty Cycle
96
95
94
93
92
91
90
–75 – 50 – 25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)
1070/71 G02
Minimum Input Voltage
2.9
SWITCH CURRENT = 5A
2.8
2.7
2.6
SWITCH CURRENT = 0A
2.5
2.4
2.3
–75 – 50 – 25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1070/71 G04
Line Regulation
5
4
3
T_J = 150°C
2
T_J = 25°C
1
0
T_J = – 55°C
–1
–2
–3
–4
–5
0 10 20 30 40 50 60
INPUT VOLTAGE (V)
1070/71 G07
Switch Saturation Voltage
1.6
FOR LT1071, DIVIDE
1.4 ^{CURRENT BY 2}
1.2
100°C
1.0
0.8
0.6
150°C
25°C
– 55°C
0.4
0.2
0
0 1 2 34 5 6 78
SWITCH CURRENT (A)
1070/71 G05
Reference Voltage
vs Temperature
1.250
42
1.248
SWITCHING
41
FREQUENCY
1.246
40
1.244
39
REFERENCE
1.242
V0LTAGE
38
1.240
37
1.238
36
1.236
35
1.234
34
– 75 – 50 – 25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1070/71 G08
Flyback Blanking Time
2.2
2.0
1.8
1.6
1.4
1.2
1.0
–75 – 50 – 25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)
1070/71 G03
23
22
21
R_FEEDBACK = 500Ω
20
19
R_FEEDBACK = 1k
18
17
R_FEEDBACK = 10k
16
15
– 75 – 50 – 25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1070/71 G06
Feedback Bias Current
vs Temperature
800
700
600
500
400
300
200
100
0
– 75 – 50 – 25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1070/71 G09
10701fe
4