RK808-B Rockchip Power Management IC PMIC Multi-Channel Regulator QFN-68 7x7mm

RK808-B Product Overview

The RK808-B is a highly integrated Power Management IC (PMIC) from Rockchip, packaged in QFN-68-EP (7×7mm), designed for embedded processor SoCs and ARM-based motherboards. The chip integrates multiple DCDC buck converters and LDO linear regulators, providing complete power solutions for processors, memory, WiFi modules, Ethernet PHY, and other peripherals. The RK808-B is widely used in Rockchip processor companion systems, industrial control boards, embedded systems, and smart terminals.

RK808-B Core Features

Multi-Channel Power Rails： Integrates multiple high-efficiency DCDC buck converters and LDO regulators, providing complete power rail distribution for the entire system

High Integration Design： Single PMIC replaces multiple discrete power chips, significantly simplifying PCB layout, saving board space, and reducing BOM cost

QFN-68-EP Package： 7×7mm QFN-68-EP compact package with exposed pad for enhanced thermal dissipation, ideal for space-constrained embedded designs

I2C Programmable Interface： Supports I2C bus communication for software configuration of output voltages and power sequencing, offering flexible design options

High Efficiency Conversion： Integrated high-efficiency DCDC converters providing excellent power conversion efficiency, reducing energy loss and heat generation

Power Sequencing Control： Supports programmable power sequencing control, meeting strict power-up sequence requirements of processors and memory

Dynamic Voltage Scaling： Supports DVS dynamic voltage scaling, adjusting output voltage based on load to optimize system power consumption

Protection Features： Built-in undervoltage lockout, overcurrent protection, overtemperature protection ensuring reliable system operation

Wide Input Voltage Range： Supports wide input voltage range adapting to various power adapters and battery-powered scenarios

Industrial Grade Reliability： Wide operating temperature range suitable for both industrial and consumer applications

Massive Stock Availability： Abundant market inventory with date codes covering 20+ to 26+, ensuring long-term supply availability

RK808-B Applications

Rockchip Processor Companion Power： Dedicated power management solution for Rockchip RK series processors (RK3368, RK3288, etc.), used in various embedded development boards and consumer electronics

Industrial Control Motherboards： Suitable for industrial automation equipment, PLC controllers, embedded industrial control motherboards requiring high power stability and reliability

ARM Embedded Systems： Power management core for ARM-based embedded Linux/Android boards, IoT gateways, and edge computing nodes

Smart Terminals： Power management solution for smart home control panels, smart speakers, digital signage, advertising machines, and consumer electronics

Communication Module Power： Provides stable power for WiFi modules (compatible with RTL8189, AP6210, AP6212, AP6330, etc.) and Ethernet PHY

Portable Devices： Battery-powered portable devices benefit from DVS feature to extend battery life

RK808-B Key Advantages

High Integration Simplifies Design： Single RK808-B chip integrates multiple DCDC and LDO power rails, providing one-stop power solution for processors, memory, WiFi, Ethernet, and other core peripherals. In reference designs like RK3368, RK808-B serves as the standard PMIC companion, greatly simplifying system power design and reducing development cycles

Stable Market Inventory： According to component distributor data, RK808-B has abundant market inventory with date codes covering 20+, 21+, 22+, 23+, 24+, 25+, 26+ and multiple production cycles. Single supplier inventory can reach over 100,000 units, meeting volume production requirements

Flexible I2C Programmable Configuration： I2C bus allows dynamic configuration of output voltages and sequencing. Same hardware platform can adapt to different processors and memory solutions without PCB modifications, enabling product family development

Compact Package for Miniaturization： 7×7mm QFN-68-EP small footprint with exposed pad for excellent thermal dissipation, meeting the miniaturization trend of modern electronics

Comprehensive Application Reference Design： Rockchip provides complete reference designs (such as RK3368_BOX_R88_RK808-B_DDR3P216SD4_V1.2) including schematics, PCB layout, and software drivers, significantly reducing development difficulty and risk

Industrial Grade Reliability： Built-in undervoltage lockout, overcurrent, and overtemperature protections with wide temperature range for 24×7 continuous industrial applications

Broad Industry Compatibility： Compatible with mainstream WiFi modules (RTL8189, RTL8723BS, AP6181, AP6210, AP6212, AP6330, AP6335, etc.), ensuring stable power supply for wireless communication modules

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FAQ:

1. What is the RK808-B PMIC and its key specifications?
   The RK808‑B is a highly integrated Power Management IC (PMIC) from Rockchip, designed for tablets, set‑top boxes, and portable embedded devices. It combines 4 synchronous step‑down DC‑DC converters (bucks), 8 low‑dropout linear regulators (LDOs), a complete single‑cell Li‑Ion battery charger (up to 2 A), a fuel gauge, and an RTC. The device communicates via I2C (default address 0x1B) and is housed in a compact QFN‑68 package (7 mm × 7 mm). Key input voltage range: 2.7 V – 5.5 V. It does not include an audio codec, making it a streamlined, cost‑effective power solution for Rockchip SoCs that handle audio externally or do not require on‑chip sound.

2. How does the RK808-B differ from the RK808-D?
   Both are members of the RK808 PMIC family and share the same core features: 4 DCDC, 8 LDO, battery charger, fuel gauge, RTC, and no audio codec. The main differences lie in output capabilities and optimizations. The RK808‑B is the earlier, cost‑effective base model with a maximum charging current of 2 A and standard buck output levels. The RK808‑D is an upgraded version that increases the charging current to 2.5 A and may offer slightly higher buck efficiency or improved dynamic performance. Both use the same QFN‑68 package and I2C address 0x1B, making them pin‑compatible. Choose the RK808‑B when 2 A charging is sufficient and you want an economical solution; the RK808‑D gives you extra charging headroom and optimizations for demanding applications.

3. What are the output capabilities of the four DC‑DC buck converters?
   The four synchronous buck converters provide the main power rails: BUCK1 and BUCK2 can each deliver up to 2.5 A, BUCK3 up to 1.5 A, and BUCK4 up to 1.5 A. All output voltages are programmable via I2C, enabling dynamic voltage scaling (DVFS) for the CPU core, memory, and I/O domains. This configuration is well‑suited for powering application processors, DDR memory, and peripheral supplies in mid‑range embedded systems.

4. How many LDOs does the RK808-B have, and what are they used for?
   It provides 8 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, 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 RK808-B include a battery charger? What are the charging specifications?
   Yes, it integrates a switching battery charger for single‑cell Li‑Ion/Li‑Poly batteries. The charging current can be programmed up to 2 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. How do I control the RK808-B, 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 0x1B (write). The host SoC can read and write internal registers to set output voltages, enable or disable power channels, adjust charging parameters, and read status flags. This fine‑grained control enables efficient power management and dynamic voltage scaling in portable devices.

7. What protection features does the RK808-B include?
   The RK808‑B 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.

8. What is the QFN‑68 package and how does it simplify design?
   The RK808‑B is housed in a QFN‑68 package measuring only 7 mm × 7 mm with a lead pitch of 0.4 mm. The exposed thermal pad ensures efficient heat dissipation. The high integration — four bucks, eight LDOs, charger, fuel gauge, and RTC — dramatically reduces component count and PCB area, making it a true one‑chip power solution for compact tablets, set‑top boxes, and embedded systems.

9. What are the most typical applications for the RK808-B?
   It is widely used with Rockchip SoCs such as RK3288, RK3399, PX30, RK3326, and similar processors in tablets, set‑top boxes, industrial control panels, smart displays, and portable media devices. Its compact size, built‑in charger, and I2C control make it an excellent power management choice for cost‑sensitive designs that do not require an integrated audio codec.

10. How does the RK808-B compare to the RK809 or RK817 PMICs?
    The key difference is the absence of an integrated audio codec. The RK809 and RK817 both include a full audio DAC, headphone amplifier, and microphone input, which adds complexity and cost for systems that do not need on‑chip audio. The RK808‑B (like the RK808‑D) focuses purely on power regulation and charging. All three share the same QFN‑68 package, but the RK808‑B uses I2C address 0x1B, while the RK809/RK817 use 0x1A. Choose the RK808‑B when your system already has an external audio codec or does not require audio; the RK809/RK817 are better all‑in‑one solutions when audio is needed.