The RT9273 is a high efficiency step-up DC-DC converter
specifically designed for dual panel mobile phone
applications.
According to SP status, RT9273 can either regulates
output current flowing through series-connected LEDs or
regulate output voltage applying to OLED with a common
output LC filter. This along with compact VDFN-10L 3x3
package and high switching frequency allows less part
count and smaller external components for space and cost
saving.
Pulling low EN pin shuts down the chip and reduces the
supply current to less than 1μA. The EN pin also accepts
PWM signal for LED brightness dimming control. The
averaged LED current is well proportional to the duty cycle
of the PWM signal. The internal soft start reduces inrush
current during EN turning on or PWM dimming control.
Other features include OVP, OCP and OTP. OVP prevents
the damages in case of feedback loop open.