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FAN5640 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN5640 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 11 page March 2012 © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5640 • Rev. 1.0.2 FAN5640 — Dual High-Side Constant Current Source for High-Voltage Keypad LED Illumination Features 20V Maximum Driver Input Level Dual Output 25mA Drive Capability per Channel Two Strings of 2-4 LEDs Each External Resistor Sets Maximum Current Fast Turn-On/Off Capability 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 Description The FAN5640 is designed to illuminate one or two strings of keypad LEDs with constant high-side current sources. The device can drive up to four white LEDs in series at a maximum current of 25mA per channel. If the second channel is not needed, the channels can be tied together to boost output current up to 50mA. An external resistor programs the maximum output current. Dimming can be accomplished by pulse width modulation of the enable pin or the input supply rail. Figure 1. Typical Application Ordering Information Part Number Operating Temperature Range Package Packing Method FAN5640S7X -40°C to 85°C SC70-6 2x2.2mm Tape and Reel |
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