3. TECHNICAL BRIEF
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The RT9396 is an integrated solution for backlighting and phone camera input supply. The part contains
a charge pump white LED driver and dual low dropout linear regulators. This IC can be shutdown by
pulling ENA low.
In the section of charge pump, The RT9396 can power up 5 white LEDs with regulated constant current
for uniform intensity. Each channel (LED1-LED5) can support up to
25mA. The part maintains highest efficiency by utilizing a x1/x1.5/x2 fractional charge pump and low
dropout current regulators. An internal 5-bit DAC is used for brightness control. Users can easily
configure up to 32-step of LED current by I2C interface.
In the section of linear regulator, The RT9396 comprises a dual channel, low noise, and low dropout
regulator sourcing up to 300mA at each channel. The range of output voltage can be configured from
1.1V to 3.3V by I2C interface. The outputs of LDO offer 3% accuracy and low dropout voltage of 250mV
@300mA. The LDO also provides current limiting and output short circuit thermal folded back protection.
Figure 3-9-2. RT9396 CIRCUIT DIAGRAM
3. TECHNICAL BRIEF
