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LT1786FCS#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
4
LT1786F
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Supply Current
vs Temperature
TEMPERATURE (°C)
–75
SUPPLY CURRENT (mA)
6
8
10
9
7
5
3
1
125
1786 G01
4
2
0
–25–50 0 50 100 150
25
75
175
TEMPERATURE (°C)
ISUS (µA)
60
8O
100
90
70
50
30
10
125
1786 G02
40
20
0
–25–55 –5 50 100 150
25
75
V
CC
= 5V
SMBSUS = 0V
V
CC
= 3V
ISUS Current vs Temperature
SHDN Supply Current
vs Temperature
SHDN Input Bias Current
vs Temperature
SHDN Threshold Voltage
vs Temperature
TEMPERATURE (°C)
0.6
SHDN THRESHOLD VOLTAGE (V)
0.8
1.0
1.2
1.1
0.9
0.7
–25 25 75 125
1786 G05
175–50–75 0 50 100 150
Frequency vs Temperature
Maximum Duty Cycle
vs Temperature
TEMPERATURE (°C)
–75
CCFL MAXIMUM DUTY CYCLE (%)
87
91
95
93
89
85
81
77
125 150
1786 G07
83
79
75
–25 0–50
25 50
75 100
175
I
CCFL
Summing Voltage
Load Regulation
I
CCFL
PROGRAMMING CURRENT (µA)
5
4
3
2
1
0
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
40 80 120 160
1786 G09
20020
0
60 100 140 180
T = –55°C
T = 25°C
T = 125°C
∆I
CCFL
SUMMING VOLTAGE (mV)
TEMPERATURE (°C)
I
CCFL
SUMMING VOLTAGE (V)
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
–25 25 75 125
1786 G08
175–50–75 0 50 100 150
I
CCFL
Summing Voltage
vs Temperature
TEMPERATURE (°C)
0
SHDN INPUT BIAS CURRENT (µA)
2
4
6
5
3
1
–25 25 75 125
1786 G04
175–50–75 0 50 100 150
V
CC
= 5V
V
CC
= 3V
TEMPERATURE (°C)
SHDN SUPPLY CURRENT (µA)
300
270
240
210
180
150
120
90
60
30
0
125
1786 G03
–25–55 –5 50 100 150
25
75
V
CC
= 5V
SHDN = 0V
V
CC
= 3V
TEMPERATURE (°C)
–75
CCFL FREQUENCY (kHz)
220
240
125
1786 G06
200
180
160
–25
25
75
175
210
230
190
170
100
–50
0
50
150
5
LT1786F
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
TEMPERATURE (°C)
–3
CCFL V
C
SINK OFFSET CURRENT (µA)
–1
1
0
–2
10
9
6
8
7
5
3
2
4
–75 125 150
–25 0–50
25 50
75 100
175
CCFL V
C
= 0.5V
CCFL V
C
= 1.0V
CCFL V
C
= 1.5V
1786 G10
V
C
Sink Offset Current
vs Temperature
TEMPERATURE (°C)
4.80
∆CCFL V
C
SOURCE CURRENT FOR
∆I
CCFL
PROGRAMMING CURRENT (µA/µA)
4.90
4.85
5.00
4.95
5.10
5.05
–25 25 75 125
1786 G11
175–50–75 0 50 100 150
I
CCFL
= 10µA
I
CCFL
= 50µA
I
CCFL
= 100µA
∆CCFL V
C
Source Current for
∆I
CCFL
Programming Current
vs Temperature
TEMPERATURE (°C)
0
POSITIVE DIO VOLTAGE (V)
0.4
0.2
0.8
0.6
1.2
1.0
–25 25 75 125
1786 G12
175–50–75 0 50 100 150
I(DIO) = 1mA
I(DIO) = 5mA
I(DIO) = 10mA
Positive DIO Voltage
vs Temperature
TEMPERATURE (°C)
–75
NEGATIVE DIO VOLTAGE (V)
1.2
1.6
125
1786 G13
0.8
0.4
0
–25
25
75
175
1.0
1.4
0.6
0.2
100
–50
0
50
150
I(DIO) = 1mA
I(DIO) = 5mA
I(DIO) = 10mA
TEMPERATURE (°C)
–75
CCFL V
C
DIO CURRENT SERVO RATIO (µA/mA)
101
103
125
1786 G14
99
97
95
–25
25
75
175
100
102
98
96
100
–50
0
50
150
I(DIO) = 1mA
I(DIO) = 5mA
I(DIO) = 10mA
Negative DIO Voltage
vs Temperature
V
C
to DIO Current Servo Ratio
vs Temperature
TEMPERATURE (°C)
0
CCFL V
C
LOW CLAMP VOLTAGE (V)
0.10
0.05
0.20
0.15
0.30
0.25
–25 25 75 125
1786 G15
175–50–75 0 50 100 150
V
C
Low Clamp Voltage
vs Temperature
TEMPERATURE (°C)
–75
1.7
CCFL V
C
HIGH CLAMP VOLTAGE (V)
1.8
2.0
2.1
2.2
2.4
–50
50
100
1786 G16
1.9
2.3
25
150
175
–25
0
75 125
V
C
High Clamp Voltage
vs Temperature
V
C
Switching Threshold
vs Temperature
TEMPERATURE (°C)
–75
0.6
CCFL V
C
SWITCHING THRESHOLD VOLTAGE (V)
0.7
0.9
1.0
1.1
1.3
–50
50
100
1786 G17
0.8
1.2
25
150
175
–25
0
75 125
TEMPERATURE (°C)
–75
BULB PROTECT SERVO VOLTAGE (V)
7.1
7.3
7.5
7.4
7.2
7.0
6.8
6.6
125 150
1786 G18
6.9
6.7
6.5
–25 0–50
25 50
75 100
175
I
CCFL
= 10µA
I
CCFL
= 50µA
I
CCFL
= 100µA
BULB Protect Servo Voltage
vs Temperature
6
LT1786F
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
TEMPERATURE (°C)
0.940
CCFL HIGH-SIDE SENSE NULL CURRENT (A)
0.980
0.960
1.020
1.000
1.060
1.040
–25 25 75 125
1786 G21
175–50
–75
0 50 100 150
High-Side Sense Null Current
vs Temperature
TEMPERATURE (°C)
–75
CCFL HIGH-SIDE SENSE LINE REGULATI0N (%V)
0.120
0.160
125
1786 G22
0.080
0.040
0.000
–25
25
75
175
0.100
0.140
0.060
0.020
100
–50
0
50
150
High-Side Sense Null Current Line
Regulation vs Temperature
V
SW
Current Limit vs Duty Cycle
DUTY CYCLE (%)
0
0
CCFL V
SW
CURRENT LIMIT (A)
0.5
1.5
2.0
2.5
20
40
50 90
1786 G24
1.0
10 30
60
70
80
T = 25°C
T = 125°C
MINIMUM
T = 0°C
TEMPERATURE (°C)
–50–75
FULL-SCALE OUTPUT CURRENT (µA)
0–25 5025
75
100 125 150 175
1786 G26
104
103
102
101
100
99
98
97
96
V(I
OUT
) = 0.465V
Full-Scale Output Current
vs Temperature
CCFL I
SW
(A)
0
FORCED BETA
60
80
110
100
1.6
1786 G25
40
20
50
70
90
30
10
0
0.4
0.8
1.2
0.2 1.8
0.6
1.0
1.4
2.0
Forced Beta vs I
SW
on V
SW
TEMPERATURE (°C)
BULB INPUT BIAS CURRENT (µA)
6
8
10
1787 G19
4
2
0
–75 125 150
–25 0
–50
25 50
75 100
175
BULB Input Bias Current
vs Temperature
High-Side Sense Supply Current
vs Temperature
V
SW
Sat Voltage
vs Switch Current
TEMPERATURE (°C)
–75
CCFL HIGH-SIDE SENSE SUPPLY CURRENT (µA)
110
130
150
140
120
100
80
60
125 150
1786 G20
90
70
50
–25
0
–50
25 50
75 100
175
SWITCH CURRENT (A)
0
CCFL V
SW
SAT VOLTAGE (V)
0.6
0.8
1.0
1.2
1787 G23
0.4
0.2
0.5
0.7
0.9
0.3
0.1
0
0.3
0.6
0.9
1.5
T = –5°CT = 125°C
T = 25°C
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT1786FCS#TRPBF

Mfr. #:
Buy LT1786FCS#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators SMBus Progmable CCFL Sw Reg
Lifecycle:
New from this manufacturer.
Delivery:
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