Product Descriptions

The RK809 is a complex power-management integrated circuit (PMIC) integrated CODEC for multi-core system applications powered by an external power supply. The RK809 can provide a complete power management solution with very few external components.

The RK809 provides five configurable 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-kHz output buffer, and real time function. The RK809 supports 32.768-kHz clock generation based on a crystal oscillator. 

It also includes Audio CODEC , real ground Head phone driver and ClassD driver.

A “battery fuel gauge” is integrated in the RK809. Using the proprietary algorithms and the sensed battery current and voltage, the gauge can accurately calculate the battery capacity based on the charging/discharging characteristics of the battery preloaded in the system. The gauge then sends the battery capacity information to the processor through the I2C interface. 

The RK809 can dynamically adjust the output voltage of each DC-DC converter, 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. 

The 2MHz switching frequency allows small size inductors to be used for both buck and boost converters. Also, as all the power switches are integrated on chip, no external power switches and Schottky diodes are needed, which reduces the system cost significantly. 

The RK809 is available in a QFN68 7.0 mm x 7.0 mm package, with a 0.35-mm pin pitch.

Product Features

•  Input range: 2.7V - 5.5V

•  Accurate battery fuel gauge with two separate battery voltage and current ADC

•  Real time clock（RTC）

•  Low standby current of 25uA (at 32.768KHz clock frequency)

•  Real ground HeadPhone driver

•  1.3W ClassD PA without external filter inductor

•  OTP Programmable power up/down sequences and voltage

•  High performance Audio CODEC

•  One internal PLL

•  Support microphone input

•  Support I2S as the digital signal interface for both DAC and ADC

•  Support Automatic Level Control(ALC),limiter and noise gating

•  Support programmable digital and analog gains

•  Audio resolution from 16bits to 32bits 

•  Sample rate up to 192KHz 

•  Provides master and slave work mode, software configurable 

•  Support 3 I2S formats (normal, left-justified, right-justified) 

•  Support PDM mode(external input PCLK)

•  Power channels:

•  CH1:Synchronous BUCK converter,2.5A max

•  CH2:Synchronous BUCK converter,2.5A max

•  CH3:Synchronous BUCK converter,1.5A max

•  CH4:Synchronous BUCK converter,1.5A max

•  CH5:Synchronous BUCK converter,2.5A max

•  CH6~CH7,CH9~CH14:LDOs, 400mA max

•  CH8:Low noise, high PSRR LDO,100mA max

•  CH15: Switch,1.5A max

•  CH16: Switch,3A max

•  Package:7mmx7mm QFN68

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