The RT9273 is a high efficiency step-up DC-DC converterspecifically designed for dual panel mobile phoneapplications.According to SP status, RT9273 can either regulatesoutput current flowing through series-connected LEDs orregulate output voltage applying to OLED with a commonoutput LC filter. This along with compact VDFN-10L 3x3package and high switching frequency allows less partcount and smaller external components for space and costsaving.Pulling low EN pin shuts down the chip and reduces thesupply current to less than 1μA. The EN pin also acceptsPWM signal for LED brightness dimming control. Theaveraged LED current is well proportional to the duty cycleof the PWM signal. The internal soft start reduces inrushcurrent during EN turning on or PWM dimming control.Other features include OVP, OCP and OTP. OVP preventsthe damages in case of feedback loop open.
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