PT6971 is a boost DC/DC converter with one channel constant current regulator, which provides 10mA to 30mA current for up to 8 LEDs in series. The power supply is from 4V to 15V and the max output voltage is 28V. PT6971 provides both PWM dimming and analog dimming functions. The minimum PWM dimming on time is 125ns, which means 0.25% dimming duty-cycle at 20KHz is available.
PT6971 also provides much protections, such as under voltage lockout, cycle by cycle input current limit, output over voltage protection, flywheel diode open protection, feedback over voltage protection, thermal shutdown protection and so on.
PT6971 operates at fixed 600KHz, allowing the use of tiny external components to save space and cost.