RK809-2 Rockchip Power Management Unit PMU with Audio Codec QFN-68-EP 7x7mm

RK809-2 Product Overview

The RK809-2 is a high-performance Power Management Unit (PMU) from Rockchip, packaged in QFN-68-EP (7x7mm), and is an important variant of the RK809 series PMIC. The chip highly integrates both power management and audio codec functions, specifically designed for low-power embedded systems and widely used in Rockchip processor platforms such as RV1126 and RV1109.

The core feature of RK809-2 is its integrated high-performance audio Codec, eliminating the need for external audio codec chips for audio input/output functions, effectively saving PCB space and system cost. The chip communicates with the host SoC via the I2S1 interface and can directly output two microphone interfaces, one speaker interface (1.3W@8Ω driving capability), and one headphone interface.

It is important to note that the RK809-2 is positioned as a "discharge-side" PMU, focusing on efficient power distribution and system power optimization. It does NOT integrate lithium battery charging management functionality. In practical applications, an external dedicated charging IC (such as TP4056, BQ24075, or IP2312) is required to implement a complete charge/discharge management solution.

RK809-2 Core Features

DCDC Converters： Integrates multiple synchronous step-down DCDC converters providing efficient and stable power for processor cores, memory, and other major loads, supporting dynamic voltage scaling

LDO Linear Regulators： Integrates multiple high-performance LDO regulators providing low-noise, high-PSRR clean power for sensitive circuits such as PLLs, audio codecs, and sensors

Integrated Audio Codec： Built-in high-performance audio Codec supporting two microphone inputs, headphone output, and speaker output (1.3W@8Ω), eliminating the need for external audio chips

Low Rds Switches： Integrates low on-resistance switches for peripheral power switching and load management

Real-Time Clock RTC： Integrated RTC supporting 32.768kHz clock output for system wake-up and time management

Battery Voltage Monitoring： Built-in ADC function for reading battery voltage and SOC estimation, enabling battery status monitoring via I2C interface

I2C Control Interface： Supports I2C bus communication (default address 0x18) for software configuration of output voltages, power sequencing, and switch states

Programmable Power Sequencing： Supports flexible programmable power-up and power-down sequencing meeting processor power timing requirements

Package Type： QFN-68-EP (7x7mm) with exposed pad for enhanced thermal dissipation, ideal for compact PCB designs

Temperature Range： -40°C to 85°C industrial grade temperature range

RK809-2 Applications

RV1126 RV1109 Development Boards： Standard PMU companion solution for Rockchip RV1126 RV1109 smart vision processors, integrating power management and audio functions on core boards

Smart Speakers： Integrated audio codec perfectly suits voice interaction requirements of smart speakers, with 1.3W speaker drive capability for low-power audio output

Portable Terminals： Low power design and high integration suitable for handheld devices, portable media players, and other battery-powered products

IoT Devices： Smart home gateways, control panels, and consumer IoT products requiring high power management integration

Embedded Linux Boards： Complete power management solution for ARM architecture embedded Linux motherboards, especially multimedia applications requiring audio

Consumer Electronics： Tablets, e-readers, portable media players, single-board computers

RK809-2 Key Advantages

Power and Audio 2-in-1 High Integration： RK809-2 is the RK809 series PMU variant with integrated audio codec. In RV1126 development board solutions, no external audio codec chip is needed for audio input/output, significantly saving PCB area and BOM cost

Complete Audio Interface Output： The built-in codec directly outputs two microphone interfaces, one 1.3W@8Ω speaker driver interface, and one headphone interface via board-to-board connectors. The speaker drive capability suits low-power mono applications with minimal filtering components, saving additional amplifier cost

Flexible Software Control： I2C bus interface allows host SoC to dynamically configure PMU operating parameters. In RV1126 solutions, RV1126 acts as I2S master with RK809-2 as slave via I2S1 interface, enabling flexible software control

System Power Consumption Down to Watt Level： When paired with Rockchip low-power SoCs, RK809-2 achieves extremely low total system power consumption, ideal for battery-powered and 24/7 IoT devices

Comprehensive Power Management： Complete power distribution network from DCDCs to LDOs covering all system components

Industrial Grade Reliability： -40°C to 85°C wide temperature range for industrial environments and 24/7 operation

Stable Supply Chain： According to component distributor data, RK809-2 has stable market inventory. Pricing ranges from approximately $1.35to$2.30, meeting procurement needs from pilot runs to mass production

Proven Application Validation： RK809-2 successfully deployed in RV1126 RV1109 core boards and other mass-produced products. Mature, stable, and reliable

Complete Companion Ecosystem： Rockchip provides complete reference designs and software driver support with native Linux kernel support, enabling rapid power solution development

Compact Package for Miniaturization： QFN-68-EP 7x7mm small footprint with exposed pad for thermal dissipation, meeting portable device miniaturization requirements

Environmental Compliance： RoHS compliant with lead-free process meeting global environmental regulations

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FAQ:

1. What is the RK809-2 PMIC and its key specifications?
   The RK809-2 is a highly integrated Power Management Unit (PMU) from Rockchip, designed for portable and embedded applications that require efficient power regulation, battery charging, and audio functionality in a single chip. It combines 4 synchronous DC‑DC buck converters, 7 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 amp + microphone input). The device communicates via I2C (default address 0x1A) and is housed in a compact QFN‑68‑EP package (7 mm × 7 mm). Key input voltage range: 2.7 V – 5.5 V. It is a cost‑optimised, all‑in‑one power and audio solution for Rockchip SoC‑based tablets, IoT gateways, and portable media players.

2. How does the RK809-2 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 main difference lies in the power channel count and output capabilities. The RK809-2 provides 4 DC‑DC buck converters and 7 LDOs, while the RK809-5 offers 4 DC‑DC bucks and 8 LDOs. Additionally, the RK809‑2 may feature a different buck current arrangement, often with slightly lower maximum currents on some channels. Both are pin‑compatible in the QFN‑68 package. Choose the RK809‑2 when you need a more cost‑effective solution with sufficient power rails; the RK809‑5 provides one additional LDO and can be a drop‑in upgrade if that extra rail is required.

3. What are the output capabilities of the four DC‑DC buck converters in the RK809-2?
   The four synchronous buck converters supply the main system voltages. Typically, BUCK1 and BUCK2 can each deliver up to 4 A, BUCK3 up to 2.5 A, and BUCK4 up to 1.5 A. All output voltages are programmable via I2C, allowing dynamic voltage scaling (DVFS) for the CPU core, GPU, memory, and I/O domains. This arrangement gives the RK809‑2 enough current headroom to power multi‑core application processors while keeping the solution compact.

4. How many LDOs does the RK809-2 have, and what are they used for?
   The RK809-2 provides 7 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.

5. Does the RK809-2 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 simultaneous operation and charging.

6. What audio features are integrated into the RK809-2?
   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.

7. How do I control the RK809-2, 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.

8. What protection features does the RK809-2 include?
   The RK809‑2 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.

9. What is the QFN‑68‑EP package and how does it simplify design?
   The RK809‑2 is housed in a QFN‑68‑EP package measuring only 7 mm × 7 mm with a lead pitch of 0.4 mm. The exposed thermal pad (EP) ensures efficient heat dissipation. The high integration — four bucks, seven 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.

10. What are the most typical applications for the RK809-2?
    It is widely used in Rockchip‑based tablets, portable media players, IoT gateways, smart speakers, and other battery‑powered products that utilize SoCs such as RK3288, RK3399, PX30, RK3326 and similar. The combination of four bucks, seven LDOs, an integrated audio codec, and a battery charger makes it a versatile and cost‑effective power management solution for designs that need multiple power rails and high‑quality sound.