Item specifics
Description
AXP717C Product Overview
The AXP717C is a high‑performance single‑cell lithium battery power management IC (PMIC) designed Allwinner Technology, in a QFN‑52‑EP (6×6mm) ultra‑compact package with 0.4mm pitch. The chip is specifically designed for portable devices requiring multi‑channel power conversion outputs, integrating 3 high‑efficiency DCDC buck converters and 14 LDO regulators – a total of 17 power output channels. The AXP717C features advanced NVDC switch charge architecture, supports USB BC1.2 and Type‑C CC input, delivers up to 3A charge current, and integrates a unique E‑Gauge 3.0 fuel gauge system, a 30mΩ ultra‑low Rds(on) battery‑side discharge MOSFET, and both TWSI (I²C‑compatible) and RSB serial interfaces. The AXP717C is widely used in tablets, e‑ink readers, smart speakers, vacuum robots, AIoT gateways, and other single‑cell Li‑ion portable devices, providing a complete, flexible, and efficient power management solution.
AXP717C Core Features
The AXP717C employs advanced NVDC (Narrow Voltage DC) power path architecture, allowing the adapter and battery to power the system simultaneously. Even with a deeply discharged battery, the system powers on immediately when a charger is connected, ensuring uninterrupted operation. It integrates a 3A NVDC buck‑mode switch charger with 5V/3A input and ±0.5% CV accuracy for fast charging. The E‑Gauge 3.0 fuel gauge delivers high‑precision battery monitoring without external sense resistors, simplifying system design and improving battery level accuracy.
The AXP717C provides 3 high‑efficiency DCDC converters: DCDC1 (0.5‑1.54V, 4A max) for CPU core, DCDC2 (0.5‑3.4V, 3A max) for I/O and memory, and DCDC3 (0.5‑1.84V, 1.5A max) for PLL and analog supplies. It also integrates 14 LDO regulators, including an RTCLDO (coin‑cell backup), multiple 500mA/400mA/200mA general‑purpose LDOs, and a CPUSLDO (0.5‑1.4V, 30mA) dedicated for CPU auxiliary power, offering flexible peripheral power options.
The AXP717C integrates a 30mΩ ultra‑low Rds(on) battery discharge MOSFET for high‑efficiency discharge, reducing power loss and heat, extending battery runtime. It supports USB Type‑C CC logic and BC1.2 protocol for plug‑orientation detection and charger type recognition. Multiple 14‑bit high‑precision ADCs monitor input voltage/current, battery voltage/current/temperature, and system power. Dual serial interfaces (TWSI/I²C‑compatible and RSB) allow the host to dynamically configure output voltages, charge current, and interrupt conditions. DCDC/LDO power‑up sequencing and default voltages are customizable to meet the strict timing requirements of various application processors.
The AXP717C features multiple protection mechanisms including input OVP, OCP, OTP, battery NTC sensing (hot/cold charge suspend), programmable safety timer, DCDC UVP/OVP, and LDO current limit protection, ensuring safe and stable operation. It supports Green Mode with power‑off current <35µA (BATFET off, RTCLDO output on), and a breathing‑effect LED for charging status indication. The chip integrates all power MOSFETs, current sensing, and loop compensation, drastically reducing external component count and PCB area – a typical application requires only a single 1μH inductor.
AXP717C Applications
The AXP717C is ideal for tablets, e‑ink readers, smart speakers, vacuum robots, AIoT gateways, handheld payment terminals, portable projectors, and children‘s learning devices.
AXP717C Key Advantages
The AXP717C integrates 3 DCDCs and 14 LDOs – 17 power channels – in a tiny 6×6mm package, providing a complete power tree for a high‑performance application processor and its peripherals, dramatically simplifying portable device power system design. As a mainstream model in the AXP717 series, it is optimised for industrial embedded applications such as AIoT gateways, smart home, and industrial control. NVDC architecture guarantees immediate system power‑up even after deep battery discharge. The E‑Gauge 3.0 fuel gauge delivers accurate battery percentage without external sense resistors or complex algorithms, significantly shortening software development cycles.
The AXP717C supports 5V/3A fast charging and features a 30mΩ ultra‑low resistance discharge path, balancing rapid charging and high‑efficiency discharge. Startup sequencing and default voltages are fully configurable to perfectly match Allwinner processors’ strict timing requirements. Full Type‑C CC logic and BC1.2 compatibility ensure automatic charger recognition and adaptation. Comprehensive protection (OVP, OCP, OTP, NTC, safety timer, etc.) safeguards device and battery.
Green Mode consumes less than 35µA, significantly extending standby time for battery‑powered devices. Dual serial interfaces (TWSI and RSB) allow dynamic adjustment of output voltages and charge current, enabling the same hardware platform to adapt to different processors. The compact QFN-52-EP (6×6mm) package integrates all power MOSFETs, current sensing, and loop compensation, requiring only a single external 1μH inductor – reducing PCB area and production cost. As a domestic power management solution from X‑Powers/Allwinner, the AXP717C offers supply chain security for projects with strict localisation requirements in industrial, automotive, and information technology sectors.
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FAQ:
What is the AXP717C PMIC and what are its primary functions?
The AXP717C is a highly integrated Power Management IC (PMIC) from Allwinner, designed to supply all necessary voltage rails for application processors, vision SoCs, and portable devices. It combines a 3 A switch‑mode battery charger, 17 output channels (including step‑down DC‑DC converters and low‑noise LDOs), a high‑accuracy E‑Gauge fuel gauge, and multiple protection circuits into a single QFN‑52 package. It significantly reduces BOM count and PCB area compared to discrete power solutions.
What is the maximum charging current of the AXP717C, and what fast‑charge protocols does it support?
The AXP717C integrates a 3 A synchronous switch‑mode battery charger. It supports constant‑current/constant‑voltage (CC/CV) charging for single‑cell Li‑ion and Li‑Po batteries, with programmable charge current, termination current, and safety timers. While it does not negotiate USB PD or proprietary fast‑charge protocols by itself, it provides the power path and control registers that allow the host SoC to implement higher‑level charging protocols.
What are the 17 power channels and what do they typically power?
The 17 channels include multiple high‑efficiency DC‑DC buck converters for the CPU core, memory (DDR), I/O, and system peripherals, as well as low‑noise LDOs for analog, PLL, camera sensor, and audio circuits. Typical outputs include 1.1 V (CPU core), 1.2 V (DDR), 1.8 V (I/O), 2.5 V/3.3 V (analog/system), and several adjustable LDOs. 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 does the E‑Gauge fuel gauge work, and what is its typical accuracy?
The E‑Gauge is a built‑in coulomb counter that continuously monitors the charge and discharge current through a small external sense resistor. It calculates the remaining battery capacity in milliamp‑hours (mAh) and reports state‑of‑charge (SoC) as a percentage. With proper calibration, the E‑Gauge achieves an accuracy of ±3‑5 %, which is sufficient for most consumer and industrial battery‑powered devices. The fuel‑gauge data is accessed via I²C registers and can be used to display battery bars or trigger low‑battery shutdown.
How does the AXP717C compare to other Allwinner PMICs like the AXP707 or AXP2101?
The AXP717C is optimized for medium‑power vision and tablet applications. The AXP707 is a simpler PMIC with fewer channels and no integrated fuel gauge, while the AXP2101 offers more channels and higher total output power for larger systems. The AXP717C sits in the sweet spot: it provides a powerful 3 A charger, the E‑Gauge, and a rich set of power rails suitable for quad‑core Cortex‑A7/A53 processors, all in a compact QFN‑52 package. Choose it when you need a single‑chip power solution with accurate battery monitoring and moderate total power.
What is the typical system efficiency of the AXP717C's DC‑DC converters?
The integrated step‑down converters achieve peak efficiencies of 90‑95 % under typical load conditions. The switching frequency is usually set around 2‑3 MHz, which allows the use of small, low‑profile inductors and capacitors. This high efficiency minimizes heat generation and extends battery runtime, which is critical for portable and thermally constrained embedded devices.
How do I configure and monitor the AXP717C? Is there an I²C interface?
Yes, the AXP717C is fully controlled through a standard I²C interface. The host processor can read and write registers to enable/disable power channels, adjust output voltages, set charging parameters, and read the E‑Gauge data. 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 types and charging profiles does the AXP717C support?
The AXP717C 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 (programmable). It follows the standard CC/CV charging profile with automatic switch‑over, and includes battery temperature monitoring via an NTC thermistor, over‑voltage protection, over‑current protection, and a power‑path management that allows the system to run directly from an external adapter while charging the battery.
What is the QFN‑52 package size, and what are the key PCB design considerations?
The AXP717C is housed in a QFN‑52 package, typically 6 mm × 6 mm in size. 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) should be kept as short as possible. It is recommended to follow Allwinner's reference layout, especially for the E‑Gauge sense‑resistor traces, which must use Kelvin (4‑wire) connections to achieve the specified fuel‑gauge accuracy. The QFN package is fully compatible with standard SMT reflow assembly.
What are the most typical applications for the AXP717C PMIC?
It is widely used alongside Allwinner V‑series vision SoCs (such as V831, V833, V526, V533) and A‑series tablet processors. Typical products include IP cameras, smart doorbells, dashcams, portable DVRs, baby monitors, and battery‑powered AI vision devices. The AXP717C's integration of a 3 A charger, a multi‑channel power tree, and an E‑Gauge makes it an ideal single‑chip power backbone for any compact, rechargeable smart device.