Item specifics
Description
RK808-D Product Overview
The RK808-D is a high-performance Power Management IC (PMIC) from Rockchip, packaged in QFN-68 (7×7mm), specifically designed for high-performance application processors such as the RK3399. The chip highly integrates 4 synchronous step-down DCDC converters, 8 high-performance LDO linear regulators, 2 low Rds switches, an I2C interface, and programmable power sequencing control. It supports a wide input voltage range of 2.7V to 5.5V with 2MHz switching frequency, featuring a current mode architecture for optimal transient performance with internal compensation and soft-start circuits. The RK808-D is widely used in tablets, set-top boxes, IoT devices, embedded systems, and mobile terminals.
RK808-D Core Features
DCDC Buck Converters： Integrates 4 synchronous step-down regulators. CH1 and CH2 deliver up to 5A each, CH3 delivers up to 3A, and CH4 delivers up to 2.5A. 2MHz switching frequency supports small external inductors and capacitors, with current mode PWM control for excellent load transient response
LDO Linear Regulators： Integrates 8 high-performance LDOs including low-noise and high PSRR types, with output current ranging from 100mA to 300mA, providing clean power for processors, memory, and sensitive analog circuits
Low Rds Switches： Integrates 2 low on-resistance switches (0.2Ω @ Vgs=3V) for peripheral power switching and load management
I2C Programmable Interface： Supports I2C bus communication for dynamic configuration of output voltages, power sequencing, and switch states, adapting to different platform requirements without hardware modifications
Power Sequencing Control： Supports flexible programmable power-up and power-down sequencing, meeting the strict power sequence requirements of processors like RK3399 for safe and reliable system startup
Dynamic Voltage Scaling： Supports DVS dynamic voltage scaling, dynamically adjusting output voltage based on processor load to optimize power consumption and extend battery life
High Conversion Efficiency： High-efficiency architecture with automatic PWM/PFM switching. PFM mode improves efficiency during light loads, while PWM mode provides low ripple output during heavy loads
Protection Features： Integrated UVLO, overcurrent protection (OCP), overtemperature protection (OTP), short circuit protection, and multiple safety mechanisms ensuring stable and reliable system operation
Vout Discharge Circuit： Each DCDC and LDO integrates output discharge circuit for rapid output voltage discharge during shutdown, ensuring complete off state
Input Voltage Range： 2.7V to 5.5V wide input voltage, compatible with single-cell lithium batteries, USB power, and 5V adapters
Package Type： QFN-68 (7×7mm) with 0.4mm pin pitch, exposed pad for enhanced thermal dissipation, ideal for compact PCB designs
Temperature Range： -40°C to 85°C industrial grade temperature range for consumer and industrial applications
VDC Force Power-On： Integrated VDC pin force power-on function. When VDC pin voltage is between 0.6V and 1.8V for 500ms, the PMIC automatically turns on, simplifying system power management design
Wide Output Range： Output voltage range of 0.8V to 5.25V for flexible configuration of each power rail
RK808-D Applications
RK3399 Companion Power： Standard PMIC companion solution for Rockchip RK3399 high-performance processor, widely used in RK3399 development boards
Tablets： Complete power management solution for ARM architecture tablets, optimizing system power consumption and battery life
Set-Top Boxes： Suitable for Android TV boxes, OTT set-top boxes, and home entertainment devices with stable and reliable power management
Industrial Control Boards： Industrial automation equipment, embedded industrial motherboards, HMI interfaces requiring high power stability
IoT Devices： Smart home gateways, IoT nodes, edge computing devices requiring precise power control
Embedded Systems： Power management core for ARM-based embedded Linux/Android boards, single board computers, and system-on-modules
Mobile Terminals： Power management solutions for smartphones, smart wearables, and portable multimedia players
Digital Signage： Core power management component for commercial display devices, digital signage, and advertising all-in-one machines
RK808-D Key Advantages
High Integration Single Chip Solution： Single RK808-D chip integrates 4 DCDCs, 8 LDOs, and 2 switches with 14 power output channels, replacing multiple discrete power ICs, significantly saving PCB area, reducing BOM cost, and design complexity
Optimized for RK3399 Platform： RK808-D is Rockchip's official standard PMIC companion solution for the RK3399 high-performance processor, widely used in RK3399 development boards and core boards with complete validation, reference designs, and software driver support
Strong Power Output Capability： Total DCDC output capacity up to 15.5A (5A+5A+3A+2.5A), meeting the demanding core voltage high current requirements of high-performance processors like RK3399
Flexible Programmable Configuration： I2C bus allows dynamic configuration of output voltages, power sequencing, and switch states. Same hardware platform can adapt to different processors and memory solutions for rapid product family development
Complete Power Sequencing Control： Programmable power-up/down sequencing ensures processor multi-rail power strictly follows required sequence, preventing chip damage or system instability caused by sequencing errors
Dynamic Voltage Scaling Power Saving： DVS function adjusts core voltage based on processor load in real time, providing sufficient voltage for high performance and lowering voltage during light loads to save power, significantly extending battery life
Industrial Grade Reliability： -40°C to 85°C wide temperature range with built-in overvoltage, overcurrent, overtemperature, and short circuit protection for industrial environments and 24/7 continuous operation
High Efficiency Power Conversion： 2MHz switching frequency with current mode architecture providing excellent transient response, DCDC converter efficiency over 90%, reducing energy loss and heat generation
Stable Market Inventory： According to component distributor data, RK808-D has abundant market inventory with date codes covering multiple production cycles. Single supplier inventory can reach over 5,000 units, ensuring stable supply for volume production
Compact Package for Miniaturization： 7×7mm QFN-68 small footprint with exposed pad for excellent thermal dissipation, meeting the miniaturization trend of modern electronics
Mature Companion Ecosystem： Rockchip provides complete reference designs including schematics, PCB layout, and software drivers for seamless integration with RK3399 processor, significantly reducing development difficulty and project risk
Broad Application Validation： Mass production validated across tablets, set-top boxes, industrial control, IoT devices, and other fields. Mature, stable, and highly reliable
Environmental Compliance： RoHS compliant with lead-free process and green materials meeting global environmental regulations
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FAQ:
What is the RK808-D PMIC and its key specifications?
The RK808‑D is a high‑performance Power Management IC (PMIC) from Rockchip, designed to supply and manage power for tablets, set‑top boxes, and other portable devices. It integrates 4 synchronous step‑down DC‑DC converters (bucks), 8 low‑dropout linear regulators (LDOs), a complete single‑cell Li‑Ion battery charger, a fuel gauge, and an RTC. The device is controlled via I2C (default address 0x1B) and comes 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 already handle audio externally.
How does the RK808-D differ from the RK809 or RK817 PMICs?
The main 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 cost and complexity for designs that do not need on‑chip audio. The RK808‑D omits the audio block, focusing purely on power regulation and battery charging. It also uses a different I2C address (0x1B vs. 0x1A for RK809/RK817). All three share similar buck and LDO topologies and the same QFN‑68 package. Choose the RK808‑D 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.
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.
How many LDOs does the RK808-D 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.
Does the RK808-D 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 2.5 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.
How do I control the RK808-D, 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.
What protection features does the RK808-D include?
The RK808‑D 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 RK808‑D 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.
What are the most typical applications for the RK808-D?
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.
How does the RK808-D compare to the older RK808 (non‑D) version?
The RK808‑D is essentially an upgraded or cost‑optimized variant of the original RK808. While the core functions — 4 bucks, 8 LDOs, charger, and I2C control — remain identical, the “D” version may feature improved buck efficiency, slightly different LDO sequencing, or enhanced protection circuitry. Both share the same QFN‑68 package and I2C address (0x1B). For new designs, the RK808‑D is recommended; it is a direct, drop‑in replacement that requires no board or software changes while offering potential performance and cost benefits.