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内容：RT9300A/B
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DS9300A/B-05 April 2011 www.richtek.com
Features
z z z z z Low 60/45mV Dropout at 20/15mA
z z z z z 5% LED Current Matching
z z z z z Simple LED Brightness Control
z z z z z 2.5V to 5.5V Supply Voltage Range
z z z z z Thermal Shutdown Protection
z z z z z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Next-Generation Wireless Handsets
z PDAs, Palmtops, and Handy Terminals
z Digital Cameras, Camcorders
z Battery-Powered Equipment
Tiny Package, Low Dropout Current Source
Ordering Information
General Description
The RT9300A/B low-dropout bias supply for white LEDs
is a high-performance alternative to the simple ballast
resistors used in conventional white LED designs. The
RT9300A/B uses an internal resistor to set the bias
current for four LEDs, which are matched to 5%. The
RT9300A/B's advantages over ballast resistors include
much lower bias variation with supply voltage variation,
significantly lower dropout voltage, and in some a pplications,
significantly improve
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