LED Driver, Series Boost, with Integrated Schottky Diode and Single-Wire Digital Interface FAN5341 www.onsemi.com Description The FAN5341 is an asynchronous constantcurrent 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. UDFN6 2 x 2, 0.65P The FAN5341 uses a simple singlewire digital control interface CASE 517DS to program the brightness levels of the LEDs in 32 linear steps by applying digital pulses. MARKING DIAGRAM For safety, the device features integrated over voltage, over current, short circuit detection, and thermal shutdown &Z&2&K protection. In addition, input undervoltage lockout protection is 341 triggered if the battery voltage is too low. The FAN5341 is available in a very low profile, small formfactor &Z = Assembly Plant Code 2 mm x 2 mm x 0.55 mm 6lead UMLP package that is green &2 = 2Digit Date Code and RoHS compliant. &K = Lot Code 341 = Specific Device Code Features Asynchronous Boost Converter Internal Schottky Diode ORDERING INFORMATION Up to 500 mW Output Power See detailed ordering and shipping information on page 2 of this data sheet. Drives 3 to 5 LEDs in Series 2.7 V to 5.5 V Input Voltage Range SingleWire Digital Control Interface to Set LED Brightness Levels 32 Linear Steps 1.2 MHz Fixed Switching Frequency SoftStart Capability Input UnderVoltage Lockout (UVLO) Output OverVoltage Protection (OVP) ShortCircuit Detection Thermal Shutdown (TSD) Protection Low Profile 6lead 2.0 x 2.0 x 0.55 mm UMLP Package This Device is PbFree, Halogen Free/BFR Free and is RoHS Compliant Applications Cellular Mobile Handsets Mobile Internet Devices Portable Media Players PDA, DSC, MP3 Players Semiconductor Components Industries, LLC, 2009 1 Publication Order Number: January, 2021 Rev. 3 FAN5341/DFAN5341 Table 1. ORDERING INFORMATION Part Number Temperature Range Package Packing Method FAN5341UMPX 40C to 85C 6lead, 2.0 x 2.0 mm UMLP 3000 / Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. TYPICAL APPLICATION DIAGRAM L = 10 H VIN SW 2.7 V to 5.5 V 2 5 FAN5341 C = 1 F IN GND VOUT 6 1 C = 1 F OUT EN FB 34 35 LEDs R = 12.7 ILED = 20 mA SET R = 10.0 ILED = 25 mA SET Figure 1. Typical Application BLOCK DIAGRAM 5 SW VIN 2 GATE D1 DRIVE 1 VOUT GND 6 BOOST OVP/ CONTROL SCD 34 FB EN Digital I/F Figure 2. Functional Block Diagram www.onsemi.com 2