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LT1182 Datasheet(PDF) 3 Page - Linear Technology

Part No. LT1182
Description  CCFL/LCD Contrast Switching Regulators
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LT1182 Datasheet(HTML) 3 Page - Linear Technology

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LT1182/LT1183/LT1184/LT1184F
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IQ
Supply Current
LT1182/LT1183: 3V
≤ VIN ≤ 30V
q
914
mA
LT1184/LT1184F: 3V
≤ VIN ≤ 30V
q
6
9.5
mA
ISHDN
SHUTDOWN Supply Current
SHUTDOWN = 0V, CCFL VC = LCD VC = Open (Note 2)
35
70
µA
SHUTDOWN Input Bias Current
SHUTDOWN = 0V, CCFL VC = LCD VC = Open
3
6
µA
SHUTDOWN Threshold Voltage
q
0.6
0.85
1.2
V
f
Switching Frequency
Measured at CCFL VSW and LCD VSW, ISW = 50mA,
175
200
225
kHz
ICCFL = 100µA, CCFL VC = Open, (LT1182) FBN = FBP =
1V, (LT1183) FB = 1V, (LT1182/LT1183) LCD VC = Open
q
160
200
240
kHz
DC(MAX)
Maximum Switch Duty Cycle
Measured at CCFL VSW and LCD VSW
80
85
%
q
75
85
%
BV
Switch Breakdown Voltage
Measured at CCFL VSW and LCD VSW
60
70
V
Switch Leakage Current
VSW = 12V, Measured at CCFL VSW and LCD VSW
20
µA
VSW = 30V, Measured at CCFL VSW and LCD VSW
40
µA
ICCFL Summing Voltage
3V
≤ VIN ≤ 30V, Measured on LT1182/LT1183
0.41
0.45
0.49
V
q
0.37
0.45
0.54
V
3V
≤ VIN ≤ 30V, Measured on LT1184/LT1184F
0.425
0.465
0.505
V
q
0.385
0.465
0.555
V
∆ICCFL Summing Voltage for
ICCFL = 0µA to 100µA
5
15
mV
∆Input Programming Current
CCFL VC Offset Sink Current
CCFL VC = 1.5V, Positive Current Measured into Pin
–5
5
15
µA
∆CCFL VC Source Current for
ICCFL = 25µA, 50µA, 75µA, 100µA,
q
4.70
4.95
5.20
µA/µA
∆ICCFL Programming Current
CCFL VC = 1.5V
CCFL VC to DIO Current Servo Ratio
DIO = 5mA out of Pin, Measure IVC at CCFL VC = 1.5V
q
94
99
104
µA/mA
CCFL VC Low Clamp Voltage
VBAT – VBULB = Bulb Protect Servo Voltage
q
0.1
0.3
V
CCFL VC High Clamp Voltage
ICCFL = 100µA
q
1.7
2.1
2.4
V
CCFL VC Switching Threshold
CCFL VSW DC = 0%
q
0.6
0.95
1.3
V
CCFL High-Side Sense Servo Current
ICCFL = 100µA, IVC = 0µA at CCFL VC = 1.5V
q
0.93
1.00
1.07
A
CCFL High-Side Sense Servo Current
BAT = 5V to 30V, ICCFL = 100µA,
0.1
0.16
%/V
Line Regulation
IVC = 0µA at CCFL VC = 1.5V
CCFL High-Side Sense Supply Current
Current Measured into BAT and Royer Pins
q
50
100
150
µA
Bulb Protect Servo Voltage
ICCFL = 100µA, IVC = 0µA at CCFL VC = 1.5V,
q
6.5
7.0
7.5
V
Servo Voltage Measured Between BAT and Bulb Pins
Bulb Input Bias Current
ICCFL = 100µA, IVC = 0µA at CCFL VC = 1.5V
5
9
µA
ILIM1
CCFL Switch Current Limit
Duty Cycle = 50%
q
1.25
1.9
3.0
A
Duty Cycle = 75% (Note 3)
q
0.9
1.6
2.6
A
VSAT1
CCFL Switch On-Resistance
CCFL ISW = 1A
q
0.6
1.0
∆I
Q
Supply Current Increase During
CCFL ISW = 1A
20
30
mA/A
∆ISW1
CCFL Switch On-Time
VREF
Reference Voltage
Measured at REF (Pin 11) on LT1183/LT1184/LT1184F
1.224
1.244
1.264
V
q
1.214
1.244
1.274
V
Reference Output Impedance
Measured at REF (Pin 11) on LT1183
q
20
45
70
Measured at REF (Pin 11) on LT1184/LT1184F
q
515
30
ELECTRICAL CHARACTERISTICS
TA = 25°C, VIN = 5V, BAT = Royer = Bulb = 12V, ICCFL = SHUTDOWN = CCFL VSW = Open, DIO = GND, CCFL VC = 0.5V,
(LT1182/LT1183) LCD VC = 0.5V, LCD VSW = Open, (LT1182) FBN = FBP = GND, (LT1183) FB = GND,
(LT1183/LT1184/LT1184F) REF = Open, unless otherwise specified.


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