MP1519 2.5-5.5V 1x, 1.5x, 2x High Efficiency Charge Pump 4 White LED Driver QFN16

MP1519 2.5-5.5V 1x, 1.5x, 2x High Efficiency Charge Pump 4 White LED Driver QFN16

The MP1519 is a fully automatic driver for powering four white LEDs, with up to 4V forward voltage, from a single Li-Ion or three NiMH cells.

Key Specifications

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

Typical Application Circuit

Applications

• Cell Phones
• PDA or Hand Held Computers
• White LED Application at 3.6V Supply "MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc.

Design Notes

• Channel-to-channel current matching sets backlight uniformity; check the matching spec at the current you will actually run.
• In boost topologies the OVP threshold must clear the worst-case forward voltage of the longest string, including temperature and binning spread.
• Keep PWM dimming above 200 Hz to stay clear of visible flicker, and away from the audio band if the product has a speaker.
• Size the inductor and output capacitor for the string current ripple, not the total LED current.

Common Questions