FAN5345: Asynchronous Series. Boost LED Driver with FAN5345: Asynchronous Series Boost LED Driver with Single-wire Digital Interface Product Presentation

Overview Larger displays are an emerging trend in mobile handsets today’s especially in smartphones. Typical size of LCD displays tend to be 3.7” to 4.3” in size. Ideal solution to backlight LCD displays of this size is with LED drivers that drive white LEDs in series. Simplifies layout and provides equal brightness for all LEDs. Efficiency becomes an extremely important parameter with larger displays as more LEDs are needed to backlight it. The more LEDs required means greater current consumption, therefore an efficient LED driver solution is highly desirable.

Introduction FAN5345 is an asynchronous series boost LED driver that can drive up to 8 white LEDs in series Compact and cost effective solution that provides superior performance Up to 85% efficiency 32 linear dimming steps for greater brightness resolution Small form factor SSOT6 package format By driving the LEDs in series, it ensures that all LEDs will have equal brightness

FAN5345 Asynchronous Series Boost LED Driver w/ Digital Interface Features Asynchronous Serial LED Driver Up to 85% efficiency Supports up to 8 LEDs 1.2MHz switching frequency Single-wire digital control interface Program up to 32 different LED brightness levels VIN = 2.5V to 5.5V Over-Voltage Protection Short Circuit Detection Thermal Shutdown Protection Pkg: 6-lead SSOT23 Applications Mobile Handsets MP3 Players Mobile Internet Devices Rugged Handheld PCs Portable Medical Equipment Company Confidential

Digital Dimming 32 linear dimming steps to provide greater brightness resolution control Finer resolution at lower current levels to provide smoother dimming Simple single-wire digital interface to set the appropriate brightness level by applying digital pulses

FAN5345 Efficiency 6 LEDs in Series 8 LEDs in Series

FAN5345 Features & Benefits High Efficiency Up to 85% peak efficiency to minimize power consumption in portable products Serial Driver Drives LEDs in series to enable equal level of brightness for all LEDs Supports up to 8 LEDs to display 4” LCD displays No need to worry about current matching between channels Single-Wire Digital Interface Simple single-wire digital interface to enable linear dimming 32 linear dimming steps to provide greater brightness resolution 1.2MHz Switching Frequency Enables use of smaller size capacitors and inductors (10µH) Lower inductor and capacitor costs Small Form Factor Saves PCB space in portable products Company Confidential

Pricing & Availability Fairchild Part Number Package Unit Price @ 1ku Availability FAN5345S20X SSOT6 $0.59 Now FAN5345S30X $0.65

Technical Materials FAN5345 Datasheet http://www.fairchildsemi.com/ds/FA/FAN5345.pdf FAN5345 Product Overview http://www.fairchildsemi.com/pf/FA/FAN5345.html Evaluation Boards Request via Sales Center Samples http://www.fairchildsemi.com/ShoppingExperience/action/displayItems?itemType=SAMPLE&gpn=FAN5345

Marketing & Apps Contacts Marketing Contact Wayne Seto wayne.seto@fairchildsemi.com +1-408-822-2197 Applications Support Hunter Chou hunter.chou@fairchildsemi.com +1-408-822-2872

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