General Description

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.

Features

● Direct Digital Control of CCFL Brightness

● Low Supply Current: 3mA Max Operating 20μA Max Shutdown

● Low-Voltage Operation, Down to 4.5V

● Internal 26V, 0.7W 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)

● High Power-to-Light Efficiency

● Selectable 290kHz/145kHz Switching Frequency

● Oscillator SYNC Input

● 16-Pin Narrow SO Package

ABSOLUTE MAXIMUM RATINGS

BATT to GND ............................................................-0.3V to 28V

BST to GND ..............................................................-0.3V to 30V

BST to LX ....................................................................-0.3V to 6V

LX to GND ................................................-0.6V to (BATT + 0.3V)

VL to GND...................................................................-0.3V to 6V