1x, 1.5x, 2x High Efficiency Charge Pump 4 White LED Driver
FEATURES
• 2% LED Current Matching
• High Efficiency (>93
• Current Source Outputs
• No Ballast Resistors Required
• 1x, 1.5x and 2x Automatic Modes
• Constant Frequency Operation
• Automatic LED Detection
• High and Low Frequency PWM Capability
• 2.5V to 5.5V Operation
• Less than 1µA Leakage during Shutdown
• Detects Changes in Battery Level
• No External Schottky Diode Required
• Soft-Start and Soft Switching Operation
APPLICATIONS
• Cell Phones
• PDA or Hand Held Computers
• White LED Application at 3.6V Supply