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LT1182CS

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
1
LT1182/LT1183/LT1184/LT1184F
CCFL/LCD Contrast
Switching Regulators
■
Wide Input Voltage Range: 3V to 30V
■
Low Quiescent Current
■
High Switching Frequency: 200kHz
■
CCFL Switch: 1.25A, LCD Switch: 625mA
■
Grounded or Floating Lamp Configurations
■
Open-Lamp Protection
■
Positive or Negative Contrast Capability
FEATURES
DESCRIPTION
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APPLICATIONS
U
The LT
®
1182/LT1183 are dual current mode switching
regulators that provide the control function for Cold Cath-
ode Fluorescent Lighting (CCFL) and Liquid Crystal Display
(LCD) Contrast. The LT1184/LT1184F provide only the
CCFL function. The ICs include high current, high efficiency
switches, an oscillator, a reference, output drive logic,
control blocks and protection circuitry. The LT1182 per-
mits positive or negative voltage LCD contrast operation.
The LT1183 permits unipolar contrast operation and pins
out an internal reference. The LT1182/LT1183 support
grounded and floating lamp configurations. The LT1184F
supports grounded and floating lamp configurations. The
LT1184 supports only grounded lamp configurations. The
■
Notebook and Palmtop Computers
■
Portable Instruments
■
Automotive Displays
■
Retail Terminals
90% Efficient Floating CCFL Configuration with Dual Polarity LCD Contrast
TYPICAL APPLICATION
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
C12
2.2µF
35V
BAT
8V TO 28V
POSCON
NEGCON
1182/3 TA01
EITHER NEGCON OR POSCON 
MUST BE GROUNDED.
GROUNDING NEGCON GIVES
VARIABLE POSITIVE CONTRAST
FROM 10V TO 30V. 
GROUNDING POSCON GIVES 
VARIABLE NEGATIVE CONTRAST
FROM –10V TO –30V.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
I
CCFL
DIO
CCFL V
C
AGND
SHDN
LCD V
C
CCFL V
SW
BULB
BAT
ROYER
V
IN
FBP
FBN
LCD V
SW
CCFL
PGND
LCD
PGND
LT1182
LAMP
UP TO 6mA
10
6
L1
L3
R1
750Ω
L2
100µH
321 5
4
+
+
+
ALUMINUM ELECTROLYTIC IS RECOMMENDED FOR C3B WITH AN 
ESR ≥ 0.5Ω TO PREVENT DAMAGE TO THE LT1182 HIGH-SIDE 
SENSE RESISTOR DUE TO SURGE CURRENTS AT TURN-ON.
C7, 1µF
C1*
0.068µF
D1
1N5818
D2
1N914
D4
1N914
V (PWM)
0V TO 5V
1kHz PWM
SHUTDOWN
C8, 0.68µF
R7, 10K
C5
1000pF
R2
220k
R3
100k
C3A
2.2µF
35V
C11
22µF
35V
R13
8.45k
1%
R14
1.21k
1%
5V
R10, 10k, 1%R9, 4.99k, 1%
C4
2.2µF
V
IN
≥ 3V
D3
1N5934A
24V
C3B
2.2µF
35V
C2
27pF
3kV
+
C1 MUST BE A LOW LOSS CAPACITOR, C1 = WIMA MKP-20
Q1, Q2 = ZETEX ZTX849 OR ROHM 2SC5001
L1 = COILTRONICS CTX210605
L2 = COILTRONICS CTX100-4
L3 = COILTRONICS CTX02-12403
*DO NOT SUBSTITUTE COMPONENTS
COILTRONICS (407) 241-7876
Q2* Q1*
N = 1:2
0µA TO 45µA ICCFL
CURRENT GIVES
0mA TO 6mA 
BULB CURRENT.
THIS IS EQUAL TO
0% TO 90% DUTY
CYCLE FOR THE
PWM SIGNAL.
R12
20k
R5, 43.2k, 1%
C6
2.2µF
R4 
46.4k
1%
+
D5
BAT85
C10
0.01µF
R11, 20k, 1%
C9, 0.01µF
2
4
6
9
+
CCFL BACKLIGHT APPLICATION CIRCUITS CONTAINED IN THIS
DATA SHEET ARE COVERED BY U.S. PATENT NUMBER 5408162 
AND OTHER PATENTS PENDING
2
LT1182/LT1183/LT1184/LT1184F
DESCRIPTION
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current. An active low shutdown pin typically reduces total
supply current to 35µA for standby operation. A 200kHz
switching frequency minimizes the size of required mag-
netic components. The use of current mode switching
techniques with cycle-by-cycle limiting gives high reliabil-
ity and simple loop frequency compensation. The LT1182/
LT1183/LT1184/LT1184F are all available in 16-pin nar-
row SO packages.
LT1184/LT1184F pin out the reference for simplified pro-
gramming of lamp current.
The LT1182/LT1183/LT1184/LT1184F operate with input
supply voltages from 3V to 30V. The ICs also have a
battery supply voltage pin that operates from 4.5V to 30V.
The LT1182/LT1183 draw 9mA typical quiescent current
while the LT1184/LT1184F draw 6mA typical quiescent
V
IN
, BAT, Royer, Bulb .............................................. 30V
CCFL V
SW
, LCD V
SW
............................................... 60V
Shutdown ................................................................. 6V
I
CCFL
Input Current .............................................. 10mA
DIO Input Current (Peak, < 100ms) .................... 100mA
LT1182: FBP, FBN, LT1183: FB Pin Current......... ±2mA
ABSOLUTE MAXIMUM RATINGS
W
WW
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PACKAGE/ORDER INFORMATION
W
U
U
T
JMAX
= 100°C, θ
JA
= 100°C/W
T
JMAX
= 100°C, θ
JA
= 100°C/W
Consult factory for Industrial and Military grade parts
LT1183CS
ORDER PART
NUMBER
T
JMAX
= 100°C, θ
JA
= 100°C/W T
JMAX
= 100°C, θ
JA
= 100°C/W
LT1182CS
ORDER PART
NUMBER
LT1184CS
ORDER PART
NUMBER
LT1184FCS
LT1183/LT1184/1184F: REF Pin Source Current .... 1mA
Junction Temperature (Note 1)............................ 100°C
Operating Ambient Temperature Range ..... 0°C to 100°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
ORDER PART
NUMBER
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
CCFL PGND
I
CCFL
DIO
CCFL V
C
AGND
SHUTDOWN
LCD V
C
LCD PGND
CCFL V
SW
BULB
BAT
ROYER
V
IN
FBP
FBN
LCD V
SW
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
CCFL PGND
I
CCFL
DIO
CCFL V
C
AGND
SHUTDOWN
NC
NC
CCFL V
SW
BULB
BAT
NC
V
IN
REF
NC
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
CCFL PGND
I
CCFL
DIO
CCFL V
C
AGND
SHUTDOWN
LCD V
C
LCD PGND
CCFL V
SW
BULB
BAT
ROYER
V
IN
REF
FB
LCD V
SW
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
CCFL PGND
I
CCFL
DIO
CCFL V
C
AGND
SHUTDOWN
NC
NC
CCFL V
SW
BULB
BAT
ROYER
V
IN
REF
NC
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
3
LT1182/LT1183/LT1184/LT1184F
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Supply Current LT1182/LT1183: 3V ≤ V
IN
≤ 30V ● 914 mA
LT1184/LT1184F: 3V ≤ V
IN
≤ 30V ● 6 9.5 mA
I
SHDN
SHUTDOWN Supply Current SHUTDOWN = 0V, CCFL V
C
= LCD V
C
= Open (Note 2) 35 70 µA
SHUTDOWN Input Bias Current SHUTDOWN = 0V, CCFL V
C
= LCD V
C
= Open 3 6 µA
SHUTDOWN Threshold Voltage ● 0.6 0.85 1.2 V
f Switching Frequency Measured at CCFL V
SW
and LCD V
SW
, I
SW
= 50mA, 175 200 225 kHz
I
CCFL
= 100µA, CCFL V
C
= Open, (LT1182) FBN = FBP =
1V, (LT1183) FB = 1V, (LT1182/LT1183) LCD V
C
= Open ● 160 200 240 kHz
DC(MAX) Maximum Switch Duty Cycle Measured at CCFL V
SW
and LCD V
SW
80 85 %
● 75 85 %
BV Switch Breakdown Voltage Measured at CCFL V
SW
and LCD V
SW
60 70 V
Switch Leakage Current V
SW
= 12V, Measured at CCFL V
SW
and LCD V
SW
20 µA
V
SW
= 30V, Measured at CCFL V
SW
and LCD V
SW
40 µA
I
CCFL
Summing Voltage 3V ≤ V
IN
≤ 30V, Measured on LT1182/LT1183 0.41 0.45 0.49 V
● 0.37 0.45 0.54 V
3V ≤ V
IN
≤ 30V, Measured on LT1184/LT1184F 0.425 0.465 0.505 V
● 0.385 0.465 0.555 V
∆I
CCFL
Summing Voltage for I
CCFL
= 0µA to 100µA 5 15 mV
∆Input Programming Current
CCFL V
C
Offset Sink Current CCFL V
C
= 1.5V, Positive Current Measured into Pin –5 5 15 µA
∆CCFL V
C
Source Current for I
CCFL
= 25µA, 50µA, 75µA, 100µA, ● 4.70 4.95 5.20 µA/µA
∆I
CCFL
Programming Current CCFL V
C
= 1.5V
CCFL V
C
to DIO Current Servo Ratio DIO = 5mA out of Pin, Measure I
VC
at CCFL V
C
= 1.5V ● 94 99 104 µA/mA
CCFL V
C
Low Clamp Voltage V
BAT
– V
BULB
= Bulb Protect Servo Voltage ● 0.1 0.3 V
CCFL V
C
High Clamp Voltage I
CCFL
= 100µA ● 1.7 2.1 2.4 V
CCFL V
C
Switching Threshold CCFL V
SW
DC = 0% ● 0.6 0.95 1.3 V
CCFL High-Side Sense Servo Current I
CCFL
= 100µA, I
VC
= 0µA at CCFL V
C
= 1.5V ● 0.93 1.00 1.07 A
CCFL High-Side Sense Servo Current BAT = 5V to 30V, I
CCFL
= 100µA, 0.1 0.16 %/V
Line Regulation I
VC
= 0µA at CCFL V
C
= 1.5V
CCFL High-Side Sense Supply Current Current Measured into BAT and Royer Pins ● 50 100 150 µA
Bulb Protect Servo Voltage I
CCFL
= 100µA, I
VC
= 0µA at CCFL V
C
= 1.5V, ● 6.5 7.0 7.5 V
Servo Voltage Measured Between BAT and Bulb Pins
Bulb Input Bias Current I
CCFL
= 100µA, I
VC
= 0µA at CCFL V
C
= 1.5V 5 9 µA
I
LIM1
CCFL Switch Current Limit Duty Cycle = 50% ● 1.25 1.9 3.0 A
Duty Cycle = 75% (Note 3)
● 0.9 1.6 2.6 A
V
SAT1
CCFL Switch On-Resistance CCFL I
SW
= 1A ● 0.6 1.0 Ω
∆I
Q
Supply Current Increase During CCFL I
SW
= 1A 20 30 mA/A
∆I
SW1
CCFL Switch On-Time
V
REF
Reference Voltage Measured at REF (Pin 11) on LT1183/LT1184/LT1184F 1.224 1.244 1.264 V
● 1.214 1.244 1.274 V
Reference Output Impedance Measured at REF (Pin 11) on LT1183 ● 20 45 70 Ω
Measured at REF (Pin 11) on LT1184/LT1184F
● 51530 Ω
ELECTRICAL CHARACTERISTICS
T
A
= 25°C, V
IN
= 5V, BAT = Royer = Bulb = 12V, I
CCFL
= SHUTDOWN = CCFL V
SW
= Open, DIO = GND, CCFL V
C
= 0.5V,
(LT1182/LT1183) LCD V
C
= 0.5V, LCD V
SW
= Open, (LT1182) FBN = FBP = GND, (LT1183) FB = GND,
(LT1183/LT1184/LT1184F) REF = Open, unless otherwise specified.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LT1182CS

Mfr. #:
Buy LT1182CS
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators LT1182 - CCFL/LCD Contrast Switching Regulators
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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