RK809 Datasheet | Rockchip

Overview The RK809 is a plex power-management integrated circuit (PMIC) integrated CODEC for multi-core system applications powered by an external power supply. The RK809 can provide a plete power management solution with very few external ponents. The RK809 provides five fast load transient synchronous step-down converters. The device also contains 9 LDO regulators, two switches and a battery fuel gauge. Powerup/power-down controller is configurable and can support any customized powerup/power-down sequences (OTP based). A real-time clock (RTC) is also integrated to provide a 32.768-k Hz output buffer, and real time function. The RK809 supports 32.768k Hz clock generation based on a crystal oscillator. It also includes Audio CODEC , real ground Head phone driver and Class D driver. The RK809 integrates four channels step-down DC-DC converters. All of them adopt ripple base control to achieve very fast load transient response. Meanwhile, all of them can dynamically adjust the output voltage, as required by the processor based on the processor’s operation status so as to maximize the system efficiency. The output voltages of most channels can be configured through the I2C interface. The inputs of all channels have soft start function, which greatly reduces the inrush current at the startup. 2.5MHz switching frequency and good control method decrease the external inductance and capacitance. The RK809 also integrate a peak current mode control high efficiency buck converter, maximum current up to 2.5A, it’s usually used to power LDOs. The RK809 integrates nine channels LDO regulators. The LDO3 is high PSRR (75d B @1Khz) high accuracy low drop-out regulator. The inputs of all LDO regulators could be decrease to 2V for high convert efficiency. The output voltages of all LDO regulators can be configured through the I2C interface. A “battery fuel gauge” is integrated in the RK809. Using the proprietary algorithms and the sensed battery current and voltage, the gauge can...