Is Now Part of To learn more about ON Semiconductor, please visit our website at www.onsemi.com Please note: As part of the Fairchild Semiconductor integration, some of the Fairchild orderable part numbers will need to change in order to meet ON Semiconductors system requirements. Since the ON Semiconductor product management systems do not have the ability to manage part nomenclature that utilizes an underscore ( ), the underscore ( ) in the Fairchild part numbers will be changed to a dash (-). This document may contain device numbers with an underscore ( ). Please check the ON Semiconductor website to verify the updated device numbers. The most current and up-to-date ordering information can be found at www.onsemi.com. Please email any questions regarding the system integration to Fairchild questions onsemi.com. ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductors product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. Typical parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customers technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN5640 Dual High-Side Constant Current Source for High-Voltage Keypad LED Illumination March 2012 FAN5640 Dual High-Side Constant Current Source for High-Voltage Keypad LED Illumination Features Description The FAN5640 is designed to illuminate one or two strings 20V Maximum Driver Input Level of keypad LEDs with constant high-side current sources. Dual Output The device can drive up to four white LEDs in series at a 25mA Drive Capability per Channel maximum current of 25mA per channel. If the second channel is not needed, the channels can be tied Two Strings of 2-4 LEDs Each together to boost output current up to 50mA. External Resistor Sets Maximum Current An external resistor programs the maximum output Fast Turn-On/Off Capability current. Dimming can be accomplished by pulse width modulation of the enable pin or the input supply rail. Low Bias Current SC70-6 Package Thermal Shutdown Protection Applications Keypad Illumination Main Display and Sub-Display Illumination Cell Phones, Smart Phones Pocket PCs PDA, DSC, PMP, and MP3 Players Figure 1. Typical Application Ordering Information Part Number Operating Temperature Range Package Packing Method FAN5640S7X -40C to 85C SC70-6 2x2.2mm Tape and Reel 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5640 Rev. 1.0.2