The PT4108 is a compact, high efficient, and low voltage step-up high brightness LED driver with an Adaptive Current Mode PWM control loop. It comprises of an error amplifier, a ramp generator, a PWM comparator, a switch pass element and driver. It provides stable and high efficient operation over a wide range of load currents. It operates in stable waveforms without external compensation. The low start-up input voltage below 1V makes it suitable for 1~4 battery cells. The 500KHz high switching rate reduces the size of external components. Besides, the 25?A low quiescent current together with high efficiency maintains long battery lifetime. The output current set by the external high precision resistor.
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