●The FAN5776 is a synchronous, constant-current LED driver capable of efficiently driving up to ten LEDs in a five-string, two-series LEDs per string configuration. Optimized for small form-factor applications, the 1.8 MHz switching frequency allows the use of tiny chip inductors and capacitors.For safety, the device features integrated over-voltage, short-circuit, and thermal shutdown protections. In addition, input under-voltage lockout protection is triggered if the battery voltage is too low. The FAN5776 is comprised of low-dropout, high-side current sources, enabling a high efficiency delivery of power from the battery to the LEDs. The LED current control is established with a series R resistor, which is connected between the internal voltage reference on the chip and ground. During operation, FAN5776 holds the boost regulator’s voltage on C during the off cycle of the PWM dimming, which helps minimize audible noise.
●Features
●---
● |
● Synchronous Current-Mode Boost Converter
● Drives up to 10 LEDs at 25 mA Each in a Configuration of 5 Strings of 2 LEDs in Series
● 5 LED Outputs: High-Side Current Sources
● Two Default Groups of 3x2-LED Channels and 2x2-LED Channels with Individual Enable and PWM Dimming Control to Support Various Lighting Applications, such as:
● Backlighting of Dual-LCD Displays, LCD Display Plus Keypad Illumination
● Boost PFM Mode Maximizes Efficiency Under Light Loads
● 2.3 V to 5.5 V Input Voltage Range
● 1.8 MHz Switching Frequency
● Input Under-Voltage Lockout (UVLO)
● Output Over-Voltage Protection (OVP)
● Short-Circuit and Thermal Shutdown (TSD) Protection
Part 3D Model
