LT1940 Linear Technology, LT1940 Datasheet - Page 4

• Manufacturer Part Number: LT1940
• Description: Dual Monolithic 1.4A/ 1.1MHz Step-Down Switching Regulator
• Manufacturer: Linear Technology

LT1940
TYPICAL PERFOR A CE CHARACTERISTICS
4
1.3
1.2
1.1
1.0
0.9
10
40
30
20
0
–50
0
Boost Pin Current
Frequency vs Temperature
–25
0.5
SWITCH CURRENT (A)
0
TEMPERATURE ( C)
25
1.0
50
75
1.5
W
100
1940 G10
1940 G07
U
125
2.0
3.0
2.5
2.0
1.5
1.0
0.5
1.4
1.2
1.0
0.8
0.6
0.4
0.2
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0
–50
0
Current Limit vs Duty Cycle
0
RUN/SS Thresholds vs
Temperature
Frequency Foldback
–25
0.2
20
FEEDBACK VOLTAGE (V)
0
TEMPERATURE ( C)
0.4
TO RUN
MINIMUM
DUTY CYCLE (%)
40
25
TYPICAL
0.6
TO SWITCH
50
60
0.8
75
80
100
1.0
1940 G13
1940 G11
1940 G08
125
1.2
100
3.40
3.35
3.30
3.25
3.20
3.0
2.5
2.0
1.5
1.0
0.5
0
–50 –25
–50
V
I
RUN/SS
CHANNEL 1, FIGURE 1, V
OUT
–25
vs Temperature
vs Temperature
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
25
25
50
50
IN
= 12V
75
75
100
100
1940 G12
1940 G09
1940i
125
125