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The LT®1182/LT1183 are dual current mode switchingregulators that provide the control function for Cold Cath-ode Fluorescent Lighting (CCFL) and Liquid Crystal Display(LCD) Contrast. The LT1184/LT1184F provide only theCCFL function. The ICs include high current, high efficiencyswitches, 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 pinsout an internal reference. The LT1182/LT1183 supportgrounded and floating lamp configurations.
The LT1184Fsupports grounded and floating lamp configurations.
TheLT1184 supports only grounded lamp configurations. The
LT1183 Maximum Ratings
VIN, BAT, Royer, Bulb ................................................ 30V CCFL VSW, LCD VSW ............................................... 60V Shutdown .................................................................. 6V ICCFL Input Current .............................................. 10mA DIO Input Current (Peak, < 100ms) ...................... 100mA LT1182: FBP, FBN, LT1183: FB Pin Current ............ ±2mA 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
LT1183 Features
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
LT1183 Typical Application
Notebook and Palmtop Computers Portable Instruments Automotive Displays Retail Terminals