RK817-5 Rockchip PMIC Power Management IC Multi-Channel DCDC LDO with Audio QFN-68

RK817-5 Product Overview

The RK817-5 is a high-performance Power Management IC (PMIC) from Rockchip, packaged in QFN-68 (7×7mm), designed for compute modules (SoM) and embedded systems. The device integrates multiple high-efficiency synchronous step-down DCDC converters and LDO linear regulators, providing complete power management solutions for processors, memory, storage, and audio peripherals. The RK817-5 is widely used as the core power management unit in Radxa CM3 compute modules powering the RK3566 SoC.

The RK817-5 integrates audio codec functionality supporting speaker, headphone, and microphone I/O. Key features include adjustable current limit, power sequencing control, and Dynamic Voltage Scaling (DVS). This PMIC is the upgraded replacement for the RK809-5, officially adopted in the Radxa CM3 V1.1 hardware revision.

RK817-5 Core Features

DCDC Buck Converters： Multiple synchronous step-down DCDC converters with Dynamic Voltage Scaling (DVS) support for real-time power optimization

LDO Linear Regulators： Multiple high-performance LDOs providing low-noise, high-PSRR power for sensitive circuits including PLLs and audio codecs

Adjustable Current Limit： Integrated adjustable current limit protection for downstream circuit protection

Power Sequencing Control： Programmable power-up/down sequencing meeting strict processor power timing requirements

Audio Codec： Integrated codec supporting speaker output, headphone output, and microphone input. Audio signals require proper PCB layout with differential routing for SPK and isolated routing for HP channels

OTG Function： Integrated USB OTG output capability for external power delivery

Package Type： QFN-68 (7×7mm) with tape and reel packaging, 1000 units per reel

Temperature Range： Industrial grade wide temperature range

Target Platform： Standard PMIC for Radxa CM3 compute module powering RK3566 SoC

RK817-5 Applications

Compute Modules (SoM)： Core power management unit for Radxa CM3 and similar SoMs, providing complete power for RK3566 SoC and peripherals

Industrial Embedded Boards： Core power management for industrial single-board computers and embedded Linux motherboards

Smart Audio Devices： Integrated audio codec ideal for smart speakers and voice assistants with strict PCB layout requirements

IoT Gateways： Low power characteristics for 24/7 edge computing and IoT gateway devices

Portable Devices： Handheld terminals and tablets benefiting from DVS power optimization

RK817-5 Key Advantages

Highly Integrated SoM-Ready PMIC： RK817-5 is the standard PMIC for Radxa CM3, integrating multiple DCDCs, LDOs, and audio codec in a single chip. Officially adopted as the RK809-5 replacement in Radxa CM3 V1.1

Complete Audio Subsystem： Integrated codec with speaker, headphone, and microphone support eliminates external audio chips. PCB design guidelines require differential SPK routing (20mil), isolated HP channels (10mil+), and proper MIC routing (8mil+)

Dual Protection with Adjustable Current Limit and Power Sequencing： Adjustable current limit and programmable power sequencing work together for robust system protection

Dynamic Voltage Scaling for Power Optimization： DVS adjusts core voltage based on real-time processor load for optimal power efficiency

Industrial Grade Reliability： Wide temperature range validated in Radxa CM3 industrial SoM products

Mature Application Ecosystem： Production-validated in mainstream SoM products with complete reference designs and software drivers. Audio design guidelines from real engineering documentation

Compact Package for Miniaturization： 7×7mm QFN-68 with tape and reel packaging (1000/reel) for SMT production

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FAQ:

1. What is the RK817-5 PMIC and its key specifications?
   The RK817-5 is a highly integrated Power Management IC (PMIC) from Rockchip, designed to supply and manage power for portable devices. It combines 4 DC‑DC synchronous buck converters, multiple LDOs, a complete audio codec (DAC + headphone amp + microphone input), a single‑cell Li‑Ion battery charger, a fuel gauge, and an RTC. The device communicates via I2C (default address 0x1A) and is housed in a compact QFN‑68 package (7 mm × 7 mm). Key input voltage range: 2.7 V – 5.5 V. It is a popular companion chip for many Rockchip SoCs, providing a compact, all‑in‑one power and audio solution.

2. How many DC‑DC buck channels and LDOs does the RK817-5 have, and what are their output capabilities?
   The RK817-5 integrates four synchronous buck converters: BUCK1 and BUCK2 can each deliver up to 2.5 A, BUCK3 up to 1.5 A, and BUCK4 up to 2 A. It also includes six LDO channels, each typically capable of supplying 200 mA – 300 mA. All output voltages are programmable via I2C, allowing the host processor to adjust core, I/O, and peripheral voltages dynamically for power‑saving modes (DVFS).

3. What audio features does the RK817-5 integrate?
   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 offers both analog and I2S/PCM digital audio interfaces, enabling playback, voice recording, and hands‑free calls. This built‑in audio removes the need for an external codec in many cost‑sensitive designs.

4. Does the RK817-5 support battery charging? What are the charging specifications?
   Yes, it includes a switching battery charger designed for single‑cell Li‑Ion/Li‑Poly batteries. The charging current can be programmed up to 2 A, with a dedicated charger input voltage of 4.5 V – 5.5 V. It supports constant‑current/constant‑voltage (CC/CV) charging, battery temperature monitoring, and automatic power‑path management to power the system while charging. A built‑in fuel gauge estimates battery capacity using voltage‑based algorithms.

5. How do I control the RK817-5, and what is its I2C address?
   All functions are controlled through a standard I2C serial interface. 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. The I2C interface operates at up to 400 kHz.

6. What protection features does the RK817-5 include?
   The RK817-5 provides comprehensive safeguards: 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. These features help ensure safe operation under fault conditions and prolong battery life.

7. What is the input voltage range, and what power sources can be used?
   The main system input voltage range is 2.7 V to 5.5 V, allowing the PMIC to be powered directly from a USB port (5 V), a single‑cell Li‑Ion battery (3.0 V – 4.2 V), or a regulated 3.3 V / 5 V supply. The separate charger input accepts 4.5 V – 5.5 V, typically connected to a USB or adapter input. This flexibility supports both battery‑only and always‑powered applications.

8. How small is the QFN‑68 package, and what are the PCB design implications?
   The RK817-5 comes in a QFN‑68 package measuring only 7 mm × 7 mm with a lead pitch of 0.4 mm. It features an exposed thermal pad on the bottom for efficient heat dissipation. The compact footprint, combined with the high integration, significantly reduces the overall PCB area required for the power management subsystem, making it ideal for space‑constrained designs like tablets, portable media players, and IoT devices.

9. What are the most typical applications for the RK817-5?
   This PMIC is widely used in tablets, portable media players, e‑readers, smart speakers, IoT gateways, and other battery‑powered devices that use Rockchip SoCs such as RK3288, RK3399, PX30, RK3326, and similar. Its built‑in audio and battery charger make it a one‑chip solution for many consumer electronic products.

10. How does the RK817-5 compare to other Rockchip PMICs like the RK808 or RK818?
    Compared to the older RK808 (no audio codec, fewer LDOs, larger package), the RK817-5 offers a much higher level of integration with audio and charging in a smaller 7×7 mm package. Compared to the RK818 (which also includes audio and charging), the RK817-5 usually supports higher output currents, a more modern audio DAC, and a more compact footprint, making it a preferred choice for current‑generation portable designs. The RK817-5 is a cost‑optimized, all‑in‑one platform for mainstream Rockchip‑based products.