Part # MAX8722C datasheet

Part Manufacturer: Maxim

Maxim

Part Description: MAX8722C DS


Part Details:

19-3321; Rev 1; 2/08 EVALUATION KIT AVAILABLE Low-Cost CCFL Backlight Controller MAX8722C General Description Features The MAX8722C integrated backlight controller is opti- o Synchronized to Resonant Frequency mized to drive cold-cathode fluorescent lamps (CCFLs) Longer Lamp Life using a full-bridge resonant inverter architecture. Guaranteed Striking Capability Resonant operation maximizes striking capability and High Power to Light Efficiency provides near-sinusoidal waveforms over the entire o Wide Input Voltage Range (4.6V to 28V) input range to improve CCFL lifetime. The controlleroperates over a wide input voltage range (4.6V to 28V) o Input-Voltage Feed-Forward for Excellent Line with high power to light efficiency. The device also Rejection includes safety features that effectively protect against o Accurate Dimming Control with Analog Interface many single-point fault conditions including lamp-out o 10:1 Dimming Range and short-circuit faults. o Adjustable Accurate DPWM Frequency with Sync The MAX8722C achieves 10:1 dimming range by "chop- Function ping" the lamp current on and off using a digital pulse-width modulation (DPWM) method. The DPWM frequency o Adjustable Lamp Current Rise and Fall Time can be accurately adjusted with a resistor or synchro- o Secondary Voltage Limit Reduces Transformer nized to an external signal. The brightness is controlled Stress by an analog voltage on the CNTL pin. The device direct- o Lamp-Out Protection with Adjustable Timeout ly drives the four external n-channel power MOSFETs ofthe full-bridge inverter. An internal 5.3V linear regulator o Secondary Overcurrent Protection with powers the MOSFET drivers, the DPWM oscillator, and Adjustable Timeout most of the internal circuitry. The MAX8722C is available o Low-Cost, 24-Pin QSOP Package in a low-cost, 24-pin QSOP package and operates over a -40°C to +85°C temperature range. Ordering Information Applications PKG Notebook Computer Displays PART TEMP RANGE PIN-PACKAGE CODE LCD Monitors MAX8722CEEG -40°C to +85°C 24 QSOP


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MAX8722C.pdf Datasheet