FAN5341: Series Boost LED Driver with Integrated Schottky Diode and Single-wire Digital Interface

The FAN5341 is an asynchronous constant-current LED driver capable of efficiently delivering up to 500mW to a string of up to five LEDs in series. Optimized for small formfactor applications, the 1.2MHz 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, overcurrent, 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 2mm x 2mm x 0.55mm 6-lead UMLP package that is green and RoHS compliant.

Features

• Asynchronous Boost Converter
• Internal Schottky Diode
• Up to 500mW Output Power
• Drives 3 to 5 LEDs in Series
• 2.7V to 5.5V Input Voltage Range
• Single-Wire Digital Control Interface to Set LED Brightness Levels
• 32 Linear Steps
• 1.2MHz 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 0.55mm UMLP Package