Item specifics
Description
AXP2585 Product Overview
The AXP2585 is a highly integrated single-cell lithium battery power management IC (PMIC / BMU) designed by Allwinner Technology, in a QFN-32 (5×5mm) ultra-compact package. It features advanced NVDC power path management technology, an integrated 3A step-down switching charger, a high-efficiency OTG boost output (4.5V-5.5V adjustable, current-limited), a unique E-Gauge 2.x fuel gauge system, and TWSI/RSB communication interfaces. The AXP2585 offers multiple protection mechanisms including OVP, OCP, and OTP, and supports USB Type-C CC logic and BC1.2 protocol, making it the first domestic chip to support Type-C input. With an industrial-grade operating temperature range of -40℃ to +85℃, it is widely used in tablets, smart hardware, dash cameras, and other single-cell Li-ion portable devices, providing a simple, flexible, and efficient power management solution.
AXP2585 Core Features
NVDC Power Path Management： Advanced NVDC technology allows the adapter and battery to power the system simultaneously. Even with a deeply discharged battery, the system can power on immediately when a charger is plugged in, ensuring uninterrupted operation
15W Fast Charging Capability： Integrated high-efficiency 3A step-down switching charger supporting 5V/3A input, 15W fast charging, charging a 3000mAh battery in under 1 hour
High-Precision E-Gauge Fuel Gauge System： Unique E-Gauge 2.x fuel gauge system provides accurate battery level monitoring, eliminating the need for external precision sense resistors and improving display accuracy
OTG Boost Output： Supports OTG function with 4.5V-5.5V adjustable boost output and current limiting, enabling the device to charge external peripherals like phones
Type-C & BC1.2 Protocol Support： Supports USB Type-C CC logic and BC1.2 protocol for plug orientation detection, charger type recognition, and headset mode
Multi-Channel 12-bit ADC Monitoring： Integrated 12-bit ADCs for real-time monitoring of input voltage/current, battery voltage/current/temperature, and system power
Rich Communication Interfaces： Supports TWSI (Two-Wire Serial Interface) and RSB (Reduced Serial Bus) for dynamic configuration of output voltage, charge current, and interrupt conditions
Multiple Protection Mechanisms： Integrated OVP, OCP, OTP, and battery NTC thermistor sensing for hot/cold charge suspension, ensuring system safety
Ultra-Low Power & Ship Mode： BATFET control for ship mode (ultra-low standby power), wake-up, and full system reset
High Integration & BOM Cost Optimization： Integrates all power MOSFETs (including 11mΩ battery discharge MOSFET, up to 6A), current sensing, and loop compensation, requiring only one 1μH inductor externally, significantly reducing BOM cost and PCB area
AXP2585 Applications
Tablets / 2‑in‑1 Devices： Complete power management with 15W fast charging
IoT & Smart Hardware： Smart speakers, smart home controllers, payment terminals
Dash Cameras / Action Camcorders： Battery charging and system power management
TV Boxes / Wireless Storage Devices： Stable power distribution and battery management
E-books / Pico Projectors： Low-power devices requiring accurate battery level display
Wearables & Portable Medical Devices： Battery charging, power path management, and fuel gauging in space‑constrained devices
AXP2585 Key Advantages
Single‑Chip Integration of Charging + Path Management + Fuel Gauge + OTG： Integrates all key power management functions into a tiny 5×5mm package, dramatically simplifying portable device power system design
NVDC Technology for Uninterrupted System Operation： Even with a deeply discharged battery, the system powers on immediately when a charger is connected, enhancing user experience
15W Fast Charging + OTG Bidirectional Power： Supports both fast charging and reverse charging for peripherals – one chip for bidirectional power management
High-Precision Fuel Gauge Simplifies Software： Built‑in E‑Gauge system provides accurate battery percentage without external sense resistors or complex algorithms
95% Charging Efficiency + Low‑Rds(on) Discharge： 95% charging efficiency and 11mΩ battery discharge MOSFET minimize power loss and heat generation
Full Type‑C & BC1.2 Compatibility： The first domestic chip to support Type‑C input with CC logic and BC1.2 protocol, easily adapting to various chargers and cables
Industrial‑Grade Wide Temperature Operation： -40℃ to +85℃ operating range ensures reliable operation in industrial environments and outdoor equipment
Comprehensive System Protection： OVP, OCP, OTP, and NTC sensing – multiple protection mechanisms for device and battery safety
Flexible Software Configuration： TWSI/RSB bus allows dynamic adjustment of charge current, voltage, and OTG output parameters
Domestic Supply Chain for Independent Control： X‑Powers/Allwinner design – a domestic solution for power management in projects with strict localization requirements
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FAQ:
What is the AXP2585 PMIC and what are its primary functions?
The AXP2585 is a highly integrated Power Management IC from Allwinner, designed to supply all necessary voltage rails for application processors, vision SoCs, and portable devices. It combines a 2.5 A NVDC switch‑mode battery charger with power‑path management, multiple output channels (step‑down DC‑DC converters and low‑noise LDOs), and a suite of protection circuits into a compact QFN‑32 package. Its single‑chip design dramatically reduces BOM count and PCB area compared to discrete power solutions, making it a popular choice for entry‑level smart cameras, video doorbells, and portable media players.
What is NVDC fast charge and how does it benefit a battery‑powered system?
NVDC (Narrow Voltage DC) is an advanced power‑path architecture that separates the system power rail from the battery charging path. This allows the AXP2585 to simultaneously charge the battery and power the system from an external adapter, while dynamically managing current distribution. If the adapter cannot supply enough total power, the chip automatically draws supplemental current from the battery. This results in faster charging, lower heat generation, and the ability to operate the device with a deeply discharged or even missing battery—a critical feature for tablets, smart cameras, and portable industrial equipment.
What is the maximum charging current and battery voltage supported by the AXP2585?
The AXP2585 supports a programmable charging current up to 2.5 A, allowing reasonably fast recharge times for single‑cell Li‑ion batteries. The full‑charge voltage is typically set to 4.2 V (programmable via I²C), and the charger follows the standard CC/CV profile with automatic switch‑over. It also includes battery temperature monitoring via an NTC thermistor, over‑voltage protection, and over‑current protection, ensuring safe and reliable charging.
How many power output channels does the AXP2585 provide, and what are they typically used for?
The AXP2585 typically provides 6 output rails: three high‑efficiency DC‑DC buck converters and three low‑noise LDOs. The buck converters supply the core, memory, and I/O voltages (e.g., 1.1 V, 1.2 V, 3.3 V), while the LDOs power noise‑sensitive circuits such as PLLs, analog front‑ends, and camera sensors. Each channel can be individually enabled, sequenced, and voltage‑scaled via I²C, allowing the host processor to dynamically adjust power consumption for different operating modes.
How do I configure and monitor the AXP2585? Does it have an I²C interface?
Yes, the AXP2585 is fully controlled through a standard I²C interface. The host processor can read and write registers to enable or disable power channels, adjust output voltages, set charging parameters, and monitor the power status. Allwinner provides a reference driver and device‑tree configuration in their Linux SDK, making it straightforward to integrate the PMIC into a system. No external non‑volatile memory is needed; the chip starts up with default register values that can be overwritten during boot.
What battery protection features are integrated into the AXP2585?
The AXP2585 includes a comprehensive set of protection mechanisms: over‑voltage protection (OVP), over‑current protection (OCP), battery temperature monitoring through an external NTC thermistor, and a power‑path management that prevents the battery from discharging below a safe threshold. The chip also monitors the battery voltage and automatically stops charging when the programmed full‑charge voltage is reached, preventing over‑charging.
What types of batteries can the AXP2585 charge? Is it suitable for Li‑Po cells?
The AXP2585 is designed for single‑cell Li‑ion and Li‑Po batteries with a nominal voltage of 3.7 V and a full‑charge voltage of 4.2 V. The charge current and voltage threshold can be adjusted via I²C, allowing compatibility with various battery capacities. It is not intended for multi‑cell series packs or chemistries with significantly different charging profiles, such as LiFePO4 (3.6 V full charge).
What is the package size of the AXP2585, and what are the key PCB design considerations?
The AXP2585 is housed in a QFN‑32 package, typically measuring 4 mm × 4 mm. The exposed center pad must be soldered to a large, well‑grounded copper area for thermal dissipation. The high‑frequency switching loops (input and output capacitors for the buck converters) should be kept as short as possible. It is recommended to follow Allwinner's reference layout, especially for the charger input and battery connection traces, which should be wide enough to handle the full charging current without excessive voltage drop.
How does the AXP2585 compare to the AXP717 series? When should I choose the AXP2585?
The AXP717 series offers more output channels (typically 17) and a higher charging current (3 A), targeting higher‑end tablets and AI‑vision devices. The AXP2585 is a streamlined version, providing a smaller set of essential power rails in a more compact QFN‑32 package, making it ideal for cost‑sensitive and space‑constrained designs such as entry‑level IP cameras, smart doorbells, and portable media players. Choose the AXP2585 when your SoC requires fewer voltage rails and you want to minimize BOM cost and PCB area.
What are the most typical applications for the AXP2585 PMIC?
It is widely used alongside Allwinner V‑series vision SoCs (such as V831, V833, V851, and V853) as well as entry‑level tablet processors. Typical products include IP cameras, smart doorbells, dashcams, portable DVRs, baby monitors, and battery‑powered AI vision devices. The AXP2585's integration of a 2.5 A NVDC charger, a compact power tree, and robust protection circuits makes it an ideal single‑chip power backbone for any compact, rechargeable smart device.