LT1786F Linear Technology, LT1786F Datasheet - Page 4

• Manufacturer Part Number: LT1786F
• Description: SMBus Programmable CCFL Switching Regulator
• Manufacturer: Linear Technology

LT1786F
TYPICAL PERFORMANCE CHARACTERISTICS
4
10
95
93
91
89
85
83
81
79
77
75
87
6
5
4
3
2
1
0
9
8
7
5
4
3
2
1
0
6
–75
–75
–75
Supply Current
vs Temperature
SHDN Input Bias Current
vs Temperature
Maximum Duty Cycle
vs Temperature
– 50
–50
–50
–25
–25
–25 0
TEMPERATURE ( C)
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
25
25
25 50 75 100
50
50
V
V
CC
CC
= 3V
75
= 5V
75
100
100
W
125
125
125 150
150
150
1786 G04
1786 G01
1786 G07
U
175
175
175
0.53
0.52
0.51
0.50
0.49
0.48
0.47
0.46
0.45
0.44
0.43
0.42
0.41
0.40
0.39
0.38
100
1.2
1.1
1.0
0.9
0.8
0.7
0.6
8O
90
70
50
30
20
10
60
40
0
–55
–75
–75
ISUS Current vs Temperature
SHDN Threshold Voltage
vs Temperature
I
vs Temperature
CCFL
SMBSUS = 0V
–50
– 50
–25
–25
Summing Voltage
–25
–5
0
TEMPERATURE ( C)
0
TEMPERATURE ( C)
TEMPERATURE ( C)
25
25
25
V
V
50
50
50
CC
CC
= 5V
= 3V
75
75
75
100
100
100
125
125
125
150
150
1786 G05
1786 G08
1786 G02
175
175
150
240
230
220
–10
300
270
240
210
180
150
120
210
200
190
180
170
160
– 6
–1
–2
–3
–4
–5
–7
–8
–9
90
60
30
5
4
3
2
1
0
0
–55
–75
0
SHDN Supply Current
vs Temperature
Frequency vs Temperature
I
Load Regulation
CCFL
SHDN = 0V
–50
20
–25
I
CCFL
–25
Summing Voltage
40
PROGRAMMING CURRENT ( A)
–5
60
TEMPERATURE ( C)
TEMPERATURE ( C)
0
T = 125 C
25
80
25
V
V
T = –55 C
CC
CC
100
50
50
= 5V
= 3V
T = 25 C
120
75
75
140
100
100
160
125
125
180
150
1786 G09
1786 G06
1786 G03
175
200
150