RK860-3 Rockchip Step-Down Synchronous Rectification DC-DC Converter 7A Output WLCSP-20 RK860-3 Rockchip Step-Down DC-DC 7A 2.7V-5.5V WLCSP-20

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RK860-3 Rockchip Step-Down Synchronous Rectification DC-DC Converter 7A Output WLCSP-20

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RK860-3 Product Overview

RK860-3 is a step-down synchronous rectification DC-DC converter from Rockchip, designed for portable and embedded systems with high demands on size, efficiency, and transient performance. The RK860-3 adopts an ultra-compact WLCSP-20 package measuring just 2.01mm × 1.61mm × 0.58mm, with built-in high-side/low-side switches and an output current capability of up to 7A, making it an ideal step-down solution for SoC/CPU core power supplies or other point-to-point power delivery applications.

The RK860-3 supports a wide input voltage range of 2.7V to 5.5V, with an adjustable output voltage from 0.5V to 1.5V. The RK860-3 2.4MHz high switching frequency allows for the use of smaller external inductors and capacitors, significantly saving PCB area. The RK860-3 synchronous rectification architecture, combined with a low quiescent current of approximately 70µA, ensures high efficiency and low power consumption across the full load range. The RK860-3 operates over a junction temperature range of -40°C to +125°C.

RK860-3 Core Features

Function Type: The RK860-3 is a step-down (synchronous rectification) converter

Input Voltage: The RK860-3 supports 2.7V ~ 5.5V

Output Voltage: The RK860-3 provides adjustable 0.5V ~ 1.5V

Output Current: The RK860-3 delivers up to 7A

Switching Frequency: The RK860-3 operates at 2.4MHz

Quiescent Current (Iq): The RK860-3 has approximately 70µA

Switching FETs: The RK860-3 has built-in high-side/low-side switches

Number of Outputs: The RK860-3 provides 1

Package: The RK860-3 comes in WLCSP-20 (2.01mm × 1.61mm × 0.58mm)

Operating Temperature: The RK860-3 operates from -40°C ~ +125°C (Junction Temperature TJ)

Functional Features: The RK860-3 includes light-load high-efficiency mode, cycle-by-cycle current limit, output discharge, power-good indication, hiccup current limit

RK860-3 Applications

Mobile Terminals & Portable Devices: The RK860-3 is ideal for core/peripheral power supplies

Camera Modules & AI Edge Devices: The RK860-3 provides point-to-point power

Industrial Control & IoT: The RK860-3 enables high-efficiency, small-size power solutions

SoC/CPU Core Power: The RK860-3 excels at point-to-point power delivery

RK860-3 Key Advantages

High Switching Frequency (2.4MHz): The RK860-3 significantly reduces the size of external inductors and capacitors, ideal for space-constrained applications

Synchronous Rectification Architecture: The RK860-3 improves efficiency under both light and heavy loads, reducing heat generation

Low Quiescent Current (70µA): The RK860-3 reduces power consumption in standby mode for battery-powered devices

Adjustable Output Down to 0.5V: The RK860-3 is compatible with modern low-voltage core power requirements

7A High Output Current: The RK860-3 meets medium-to-high load transient demands

Built-in Switching FETs: The RK860-3 simplifies external circuitry and reduces BOM cost

Ultra-compact WLCSP-20 Package: The RK860-3 2.01mm × 1.61mm footprint is ideal for high-density layouts

Wide Operating Temperature Range: The RK860-3 operates from -40°C to +125°C, suitable for demanding environments

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RK860-3 Rockchip Step-Down Synchronous Rectification DC-DC Converter 7A Output WLCSP-20 RK860-3 Rockchip Step-Down DC-DC 7A 2.7V-5.5V WLCSP-20

FAQ

1. What is RK860-3?
RK860-3 is a step-down synchronous rectification DC-DC converter from Rockchip, available in an ultra-compact WLCSP-20 package. The RK860-3 integrates high-side and low-side switches with 7A output current capability, designed for portable and embedded systems demanding high efficiency and small footprint.

2. What are the key specifications of RK860-3?
The RK860-3 input voltage range: 2.7V~5.5V, programmable output voltage: 0.5V~1.5V, maximum output current: 7A, switching frequency: 2.4MHz, typical quiescent current: 70μA, junction temperature range: -40℃~+125℃. The RK860-3 internal switch RDS(ON): PFET 24mΩ, NFET 16mΩ.

3. What package does RK860-3 use?
The RK860-3 uses a WLCSP-20 ultra-compact package, measuring just 2.01mm × 1.61mm with 0.58mm height. Some sources indicate 1.65mm × 2.05mm for the RK860-3. This package is ideal for space-constrained portable devices.

4. What applications is RK860-3 suitable for?
The RK860-3 is suitable for core/peripheral power supply for mobile terminals and portable devices, SoC/CPU core power, point-of-load power for camera modules and AI edge inference devices, as well as industrial control and IoT gateways requiring high efficiency and small size.

5. What development tools support RK860-3?
The RK860-3 uses an I2C interface for output voltage programming and register configuration. Developers should refer to the official RK860-3 Datasheet and reference designs for power solution validation. Please check Rockchip's official releases for specific development tools.

6. What is the operating temperature range of RK860-3?
The RK860-3 junction temperature (TJ) range: -40℃ to +125℃. Due to the small WLCSP-20 package of the RK860-3 with relatively high thermal resistance, PCB thermal design is critical for sustained 7A output. Thermal simulation and derating based on junction temperature limits are recommended.

7. How is the output voltage of RK860-3 adjusted?
The RK860-3 supports two programming methods: via I2C interface, the output voltage can be set to 0.7125V~1.5V (12.5mV/step) or 0.5V~1.5V (6.25mV/step). Additionally, the VSEL pin of the RK860-3 selects between VSEL0 and VSEL1 registers for voltage setting.

8. What protection features does RK860-3 support?
The RK860-3 has multiple built-in protections: cycle-by-cycle over-current protection (OCP), input over-voltage protection (OVP), under-voltage lockout (UVLO), thermal shutdown (TSD), and hic-cup mode short-circuit protection.

9. What are the PCB layout considerations for RK860-3?
Recommendations for the RK860-3: ① Use multi-layer copper ground and thermal vias under or near the device; ② Keep switching loops as short as possible, place input/output capacitors close to the RK860-3 chip; ③ Use low-ESR input/output capacitors for transient response and stability; ④ Perform thermal simulation for sustained 7A output on the RK860-3. With 2.4MHz switching frequency, a 0.24μH inductor and 2×22μF ceramic capacitors are recommended for the RK860-3.

10. What peripheral interfaces does RK860-3 support?
The RK860-3 supports I2C interface (SCL/SDA) for output voltage programming and register configuration; EN pin for high-active enable control (must not be left floating); VSEL pin for voltage register selection; VOUT pin for output sensing, connected to the output capacitor side.