FAN5345 − Asynchronous Series Boost LED Driver with Single-wire Digital Interface

The FAN5345 is an asynchronous constant-current LED driver that drives LEDs in series to ensure equal brightness for all the LEDs. FAN5345S20X has an output voltage of 20V and can drive up to 5 LEDs in series. FAN5345S30X has an output voltage of 30V and drive up to 8 LEDs in series. Optimized for small form-factor applications, the 1.2MHz fixed switching frequency allows the use of small inductors and capacitors.

The FAN5345 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 FAN5345 is available in a 6-lead SSOT23 package.

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Product Status/Pricing/Packaging

Index	Product	Product & Eco Status	*Pricing	Packaging & Packing Info	**Package Marking Convention	Qualification Support	Compliance Certificates
0	FAN5345S30X	Full Production Green as of Mar 2011	$0.65	SSOT 6L Details SSOT 6L Drawing  TAPE REEL	Line 1:&E (Space) &Y (Binary Calendar Year Coding) Show more... Line 2:&O (Plant Code) 453&C (Die Run) Line 3:&. (Pin One) &O (Plant Code) &V (Eight Week Binary Datecoding)	ESD (CDM) :  1500  V ESD (HBM) :  1500  V RTHETA (JA) :  151  °C/W Show more... Moisture Sensitivity Level (MSL) :  1   Max Reflow Temp :  260	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG
0	FAN5345S20X	Full Production Green as of Mar 2011	$0.59	SSOT 6L Details SSOT 6L Drawing  TAPE REEL	Line 1:&E (Space) &Y (Binary Calendar Year Coding) Show more... Line 2:&O (Plant Code) 452&C (Die Run) Line 3:&. (Pin One) &O (Plant Code) &V (Eight Week Binary Datecoding)	ESD (CDM) :  1500  V ESD (HBM) :  1500  V RTHETA (JA) :  151  °C/W Show more... Moisture Sensitivity Level (MSL) :  1   Max Reflow Temp :  260	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG

• Fairchild 1,000 piece Budgetary Pricing. *
• If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
• Top mark packaging information for product FAN5345 is available. **

Features

￭ Asynchronous Boost Converter
￭ Drives LEDs in Series:

• FAN5345S20X: 20V Output
  
• FAN5345S30X: 30V Output
  

￭ 2.5V 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
￭ Small Form-Factor 6-Lead SSOT23 Package

Application Notes