Description
The FAN5341 is an asynchronous constant−current LED driver capable of efficiently delivering up to 500 mW to a string of up to five LEDs in series. Optimized for small form−factor applications, the 1.2 MHz fixed switching frequency allows the use of small chip inductors and capacitors.
The FAN5341 uses a simple single−wire digital control interface to program the brightness levels of the LEDs in 32 linear steps by applying digital pulses.
For safety, the device features integrated over−voltage, over−current, short−circuit detection, and thermal−shutdown protection. In addition, input under−voltage lockout protection is triggered if the battery voltage is too low.
The FAN5341 is available in a very low profile, small form−factor 2 mm x 2 mm x 0.55 mm 6−lead UMLP package that is green and RoHS compliant.

FEATUREs
• Asynchronous Boost Converter
• Internal Schottky Diode
• Up to 500 mW Output Power
• Drives 3 to 5 LEDs in Series
• 2.7 V to 5.5 V Input Voltage Range
• Single−Wire Digital Control Interface to Set LED Brightness Levels
   ♦ 32 Linear Steps
• 1.2 MHz Fixed Switching Frequency
• Soft−Start Capability
• Input Under−Voltage Lockout (UVLO)
• Output Over−Voltage Protection (OVP)
• Short−Circuit Detection
• Thermal Shutdown (TSD) Protection
• Low Profile 6−lead 2.0 x 2.0 x 0.55 mm UMLP Package
• This Device is Pb−Free, Halogen Free/BFR Free and is RoHS
   Compliant

APPLICATIONs
• Cellular Mobile Handsets
• Mobile Internet Devices
• Portable Media Players
• PDA, DSC, MP3 Players