High Efficiency White LED Driver

The NCP5604A and NCP5604B products are multiple output LED drivers dedicated to the display back light. The NCP5604A drives up to 4 LEDs, the NCP5604B version being dedicated to the three LED applications.
The two parts share a common built−in DC/DC converter, based on a charge pump structure, including the new 1.33X mode of operation, improving the efficiency over the full input battery supply voltage span over 90%.

FEATUREs
• 2.7 to 5.5 V Input Voltage Range
• Consistent 85% Efficiency
• 1.0 A Quiescent Supply Current
• All Pins are Fully ESD Protected
• Built−in Short Circuit Protection
• Provides Four Independent LED Drives
• 200 kHz Digital Dimming Function
• Unloaded LED Protection
• Short Circuit Current Proof
• Tight 0.5% LED Current Matching
• These are Pb−Free Devices

Typical Applications
• Portable Back Light
• Digital Cellular Phone Camera Photo Flash
• LCD and Key Board Simultaneously Drive