The MAX1610/MAX1611 are fully integrated, high-efficiency drivers for cold-cathode fluorescent lamps (CCFLs). They operate from a 4.5V to 26V power source. An on-board, high-switching-frequency power MOSFET reduces external component count and magnetics size. The MAX1610/MAX1611 protect against open or shorted lamps. The CCFL can be driven from an isolated transformer secondary winding to improve efficiency and avoid flicker at dim tube settings. Brightness is adjusted by scaling the lamp current, or by operating with a fixed lamp current and chopping the CCFL on and off at a rate faster than the eye can detect.
The MAX1610's digital inputs increment, decrement, or clear an internal, 5-bit up/down counter, which sets CCFL brightness. The MAX1611 uses a System Management Bus (SMBus) 2-wire serial interface to directly set CCFL brightness. Both devices include micropower shutdown and a linear regulator that eliminates the need for a separate logic supply. The digital interface remains active in shutdown, preserving the brightness setting.
Key Features
Applications/Uses
Direct Digital Control of CCFL Brightness
Low Supply Current:
3mA Max Operating
20µA Max Shutdown
Low-Voltage Operation, Down to 4.5V
Internal 26V, 0.7Ω Power Switch
Protection Against Open or Shorted Lamps
Supports Isolated Transformer Secondary Winding
SMBus Serial Interface (MAX1611)
No Flicker at Low Brightness (internal 280Hz current chopping)
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