LED Drivers Suit Mobile Devices
Nov 28, 2007 1:02 PM
News & Features From Auto Electronics
Committed to improving hybrid electric cars
New Motors for Hybrid Vehicles
Battery Firms Battle for Hybrid Hegemony
Innovative Bipolar Plates for Fuel Cells
See More Headlines
Top Articles
Exploring Current Transformer Applications
Ultracapacitor Technology Powers Electronic Circuits
Buck-Converter Design Demystified
Sensorless Motor Control Simplifies Washer Drives
PET Resources
Buyer's Guide
Conferences
Engineering Jobs
Power Electronics Events
Rent Our Lists
Spotlight on Digital Power
Leadis Technology’s LDS8866, LDS8865, and LDS8864 represent a family of charge-pump-based LED drivers for mobile backlighting applications. Based on the powerLite 50-mV LDO current regulator, the family supports up to six LEDs with a maximum current of 32 mA per channel. The on-chip non-volatile memory also allows users to define the maximum current of each of three LED banks, eliminating the need for external resistors. On-chip dimming of LED currents is controlled through a PWM interface.
The devices solve one of the most significant problems associated with charge-pump-based LED drivers, namely the transition between the high-efficiency state (1X mode) and the lower-efficiency states. Through the low dropout voltage, battery life can be extended by up to 20%, and the LDS8866, LDS8865, and LDS8864 have efficiencies of 95%, 93% and 90%, respectively. All devices are available in a 16-lead 3-mm x 3-mm TQFN package with a maximum height of 0.8 mm.
