Item specifics
Description
RK809-3 Product Overview
The RK809-3 is a flagship high-performance Power Management Integrated Circuit (PMIC) from Rockchip, packaged in QFN-68 (7x7mm), specifically designed for multi-core processor applications powered by single-cell lithium-ion batteries. The device provides a complete power and audio all-in-one solution with high integration of 5 high-current DCDC buck converters, 9 LDO linear regulators, a fuel gauge, a Real-Time Clock (RTC), programmable power sequencing, and a complete audio codec system.
The RK809-3 serves as the standard companion PMIC for Rockchip high-end processors such as RK3399Pro and RK3399, widely used in products including the Toybrick TB-RK3399ProD development board and military-grade electronic telescope baseboards as the core power management solution. The device integrates a complete audio codec subsystem with microphone inputs, headphone output, and Class D amplifier output, eliminating the need for external audio codec chips. It also features a patented high-precision fuel gauge for accurate battery capacity measurement. With a 2MHz switching frequency, the RK809-3 supports compact inductors and integrates all power switches internally, eliminating the need for external MOSFETs and Schottky diodes, significantly simplifying PCB design and reducing system cost.
RK809-3 Core Features
5 High-Current DCDC Buck Converters： Integrates 5 high-performance synchronous step-down DCDC converters providing efficient and stable power for processor cores, memory, and other major loads. Features 2MHz switching frequency supporting compact inductors with all power switches integrated internally, eliminating the need for external MOSFETs and Schottky diodes. Output voltages are I2C programmable with dynamic voltage scaling support for power optimization
9 LDO Linear Regulators： Integrates 9 high-performance LDO regulators providing low-noise, high-PSRR clean power for sensitive circuits such as PLLs, audio codecs, sensors, and I/O interfaces
Integrated Audio Codec： Built-in complete audio codec system supporting two microphone inputs, headphone output, and Class D amplifier output. Communicates with host SoC via I2S interface, enabling complete audio functionality without external codec chips
Patented High-Precision Fuel Gauge： Integrated high-accuracy battery fuel gauge using Rockchip proprietary patented algorithm, accurately measuring battery capacity based on charge/discharge characteristic curves. Provides battery information to host processor via I2C interface, supports trickle charging for over-discharged batteries, battery temperature monitoring, charge safety timer, and thermal protection
Real-Time Clock RTC： Integrated RTC supporting 32.768kHz clock output for system wake-up, time management, and timing applications
Programmable Power Sequencing： Supports flexible programmable power-up and power-down sequencing, meeting the strict power sequence requirements of high-performance processors like RK3399Pro. Most output voltages are I2C adjustable for flexible configuration
I2C Control Interface： I2C bus communication support for software configuration of output voltages, power sequencing, and operating modes for flexible system power management
Soft Start Function： All inputs feature integrated soft start circuits, significantly reducing inrush current impact on the front-end power supply for improved system stability
Fully Integrated Compensation Circuits： Internal compensation circuits eliminate the need for external resistors and capacitors, simplifying peripheral circuit design
Wide Input Voltage Range： 2.7V to 5.5V wide input voltage for single-cell lithium batteries, USB power, and 5V adapters
Package Type： QFN-68 (7x7mm) with exposed pad for enhanced thermal dissipation, ideal for compact PCB designs
Temperature Range： -40°C to 85°C industrial grade temperature range
Environmental Compliance： Lead free, RoHS compliant
RK809-3 Applications
RK3399Pro RK3399 Companion Power： Rockchip's official standard PMIC companion solution for RK3399Pro and RK3399 high-end processors. In the Toybrick TB-RK3399ProD development board, the power system uses RK809-3 as the core PMIC. Also used in Rockchip RK3399 military electronic telescope baseboards
High-Performance Tablets： Complete power management solution for high-end tablets with integrated audio codec for multimedia playback
Laptops： Suitable for ARM architecture laptops (RK3399Pro based) providing efficient and stable power management
AI Smart Speakers： Integrated audio codec and Class D amplifier output perfectly suit voice interaction and audio playback requirements of smart speakers
Smart Robot Vacuums： RK3399Pro deployed in robotic vacuum applications with RK809-3 as companion PMIC providing power management and audio functions
OTT TV Boxes： Powerful power solution for 4Kx2K TV boxes, RK3399Pro is the premium choice for high-end TV boxes with RK809-3 providing complete power support
Smart Surveillance： Suitable for high-performance smart surveillance devices with stable power management and audio interfaces
Industrial Control： Industrial automation equipment, embedded industrial motherboards requiring high power stability and reliability
IoT Gateways： Edge computing nodes, IoT gateways requiring precise power control and low power management
Electronic Telescopes Military Equipment： Deployed in mass-produced RK3399 military electronic telescope baseboards with military-grade reliability validation
RK809-3 Key Advantages
Flagship Power and Audio 2-in-1 Solution： RK809-3 is the highest integration flagship model in Rockchip's PMIC portfolio, integrating 5 DCDCs, 9 LDOs, fuel gauge, RTC, and complete audio codec system in a single chip, replacing multiple discrete components. In RV1126/RV1109/RK3399 development board solutions, no external audio codec chip is needed, significantly saving PCB area and BOM cost
Complete Audio Subsystem： Built-in audio solution with two microphone inputs, headphone output, and Class D amplifier output. In TB-RK3399ProD development board applications, complete audio functionality is achieved with minimal external components, particularly suitable for voice interaction applications like AI smart speakers and smart home devices
High-Precision Patented Fuel Gauge： Integrated battery fuel gauge using Rockchip's proprietary patented algorithm accurately measures battery capacity based on characteristic curves. Unlike traditional PMICs offering only voltage-based crude estimation, RK809-3 provides true fuel gauge level accuracy with battery temperature monitoring and charge safety timer, especially valuable for battery-powered portable devices
Optimized High-Current Output Capability： DCDC converters feature high-current design meeting the demanding core voltage current requirements of high-performance processors like RK3399Pro. 2MHz high switching frequency supports compact inductors with all power switches and compensation circuits integrated internally, eliminating external MOSFETs and Schottky diodes
Flexible Programmable Configuration： I2C bus allows dynamic configuration of output voltages and power sequencing. Same hardware platform can adapt to different processors and memory solutions without PCB modifications for rapid product family development. All inputs feature soft start circuits to reduce inrush current impact
Comprehensive Power Management： Complete power distribution network from 5 DCDCs to 9 LDOs with programmable power sequencing ensures processors power up in strict required order, meeting the stringent power sequence requirements of high-end chips like RK3399Pro for reliable system startup and operation
Industrial Grade Reliability： -40°C to 85°C wide temperature range with built-in undervoltage lockout, overcurrent protection, and overtemperature protection for industrial environments and 24/7 continuous operation
Officially Validated Mature Solution： RK809-3 successfully deployed in Toybrick official TB-RK3399ProD development board, Rockchip's official reference design platform for showcasing RK3399Pro's performance through complete chip debug, testing, and validation. Mass production validated in military-grade electronic telescope baseboards
Rich Reference Design Resources： Rockchip provides complete hardware design documentation for TB-RK3399ProD including power system block diagrams, schematics, PCB layout, and software drivers. Detailed RK3399Pro schematics illustrate RK809-3 system integration
Compact Package for Miniaturization： QFN-68 7x7mm small footprint with exposed pad for excellent thermal dissipation, meeting portable device miniaturization requirements
Environmental Compliance： RoHS compliant with lead-free process meeting global environmental regulations, obsolete status with stable inventory availability
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FAQ:
What is the RK809-3 PMIC and its key specifications?
The RK809-3 is a high‑performance Power Management IC (PMIC) from Rockchip, designed for advanced portable devices requiring multiple power rails and integrated audio. It combines 5 synchronous DC‑DC buck converters, 9 low‑dropout linear regulators (LDOs), a complete single‑cell Li‑Ion battery charger (up to 2.5 A), a fuel gauge, an RTC, and a built‑in audio codec (DAC + headphone amplifier + microphone input). The device communicates via I2C (default address 0x1A) and is housed in a compact QFN‑68 package (7 mm × 7 mm). It accepts an input voltage of 2.7 V – 5.5 V and is optimised for Rockchip application processors that demand a rich set of power, charging, and audio functions in a single chip.
How does the RK809-3 differ from the RK809-5?
Both are members of the RK809 PMIC family and share the same audio codec, battery charger, and I2C interface. The key difference is the number of power channels. The RK809-3 provides 5 DC‑DC buck converters and 9 LDOs, while the RK809-5 offers 4 DC‑DC bucks and 8 LDOs. The extra buck and LDO on the RK809‑3 give system designers additional independent power rails for complex SoC, memory, and peripheral power sequencing. Both are pin‑compatible in the QFN‑68 package. Choose the RK809‑3 when you need more granular power domains; the RK809‑5 is a perfectly capable, cost‑optimised choice when fewer rails are sufficient.
What are the output capabilities of the five DC‑DC buck converters?
The five synchronous buck converters deliver the main power rails: BUCK1 and BUCK2 can each supply up to 4 A; BUCK3 and BUCK4 each provide up to 2.5 A; and BUCK5 offers up to 1.5 A. All output voltages are programmable via I2C, enabling dynamic voltage scaling (DVFS) for CPU cores, GPU, memory, and I/O domains. This flexible, high‑current architecture makes the RK809‑3 ideal for multi‑core application processors and FPGA‑based designs.
How many LDOs does the RK809-3 have, and what are they used for?
It provides 9 LDO channels, each typically rated for 100 mA – 300 mA. These low‑noise, low‑dropout regulators supply sensitive analog and always‑on circuits such as PLLs, USB PHYs, audio codecs, camera modules, and RTC domains. One LDO is a dedicated, ultra‑low‑quiescent‑current RTC supply that keeps the system clock and critical registers alive during suspend or power‑down.
Does the RK809-3 include a battery charger? What are the charging specifications?
Yes, it integrates a switching battery charger designed for single‑cell Li‑Ion/Li‑Poly batteries. The charging current can be programmed up to 2.5 A. It supports constant‑current/constant‑voltage (CC/CV) charging, battery temperature monitoring, automatic power‑path management, and a built‑in fuel gauge for capacity estimation. The charger input is separate from the system input, allowing the device to operate and charge simultaneously.
What audio features are integrated into the RK809-3?
The on‑chip audio codec supports a 24‑bit/192 kHz stereo DAC, a headphone amplifier delivering up to 30 mW per channel, and a microphone input with a programmable gain amplifier (PGA). It provides both analog and I2S/PCM digital audio interfaces, enabling high‑quality playback, voice recording, and hands‑free calls. This built‑in audio eliminates the need for an external codec in many consumer and industrial designs.
How do I control the RK809-3, and what is its I2C address?
All functions are controlled through a standard I2C serial interface operating at up to 400 kHz. The default 7‑bit I2C address is 0x1A (write). The host SoC can read and write internal registers to set output voltages, enable or disable power channels, adjust charging parameters, configure the audio path, and read status flags. This fine‑grained control enables efficient power management and dynamic voltage scaling in portable devices.
What protection features does the RK809-3 include?
The RK809‑3 offers comprehensive hardware protections: cycle‑by‑cycle over‑current protection (OCP) on each DCDC and LDO, over‑temperature protection (OTP) with hysteresis, under‑voltage lockout (UVLO) on the main input, battery over‑voltage / over‑discharge protection, and a thermal shutdown mechanism. A power‑good (PG) flag and an interrupt output notify the host of any fault conditions, ensuring reliable operation in demanding applications.
What is the QFN‑68 package and how does it simplify design?
The RK809‑3 is housed in a QFN‑68 package measuring only 7 mm × 7 mm with a 0.4 mm lead pitch. It features an exposed thermal pad for efficient heat dissipation. The high integration — five bucks, nine LDOs, charger, audio, and RTC — dramatically reduces component count and PCB area, making it a true one‑chip power and audio solution for space‑constrained tablets, smartphones, and embedded devices.
What are the most typical applications for the RK809-3?
It is widely used in Rockchip‑based tablets, smartphones, portable media players, advanced IoT gateways, and other battery‑powered products that utilise SoCs such as RK3288, RK3399, PX30, RK3326 and similar. The five DCDC channels, nine LDOs, integrated audio, and battery charger make it a versatile and compact power management solution for designs that require multiple independent voltage rails and high‑quality sound.