Item specifics
Description
AXP717B Product Overview
The AXP717B is a high‑performance single‑cell lithium battery power management IC (PMIC) , in a QFN‑52‑EP (6×6mm) ultra‑compact package. 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 AXP717B features advanced NVDC switch charge architecture, supports USB BC1.2 and Type‑C CC input, delivers up to 3A charge current with ±0.5% CV accuracy. The chip incorporates a unique E‑Gauge 3.0 fuel gauge system, integrates a 30mΩ ultra‑low Rds(on) battery‑side discharge MOSFET, and supports both TWSI (I²C‑compatible) and RSB serial interfaces. The AXP717B 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.
AXP717B Core Features
NVDC Power Path Management： Advanced NVDC architecture allows 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
3A Fast Charging Capability： Integrated 3A NVDC buck‑mode switch charger with ±0.5% CV accuracy, supporting 5V/3A input for short charge times
High‑Precision E‑Gauge 3.0 Fuel Gauge System： Integrated E‑Gauge 3.0 fuel gauge provides accurate battery level monitoring, eliminating the need for external precision sense resistors
3 High‑Efficiency DCDC Converters： DCDC1: 0.5–1.54V, 4A max (CPU core); DCDC2: 0.5–3.4V, 3A max (I/O/memory); DCDC3: 0.5–1.84V, 1.5A max (PLL/analog)
14 LDO Regulators： Includes RTCLDO (backup battery option), plus multiple 500mA, 400mA, and 200mA general‑purpose LDOs for flexible peripheral power supply
Ultra‑Low Rds(on) Battery Discharge Path： Integrated 30mΩ ultra‑low Rds(on) battery‑side discharge MOSFET for high‑efficiency discharge, reducing power loss and heat
Type‑C & BC1.2 Protocol Support： Supports USB Type‑C CC logic and BC1.2 protocol for plug‑orientation detection and charger type recognition
Multi‑Channel 14‑bit ADC Monitoring： Integrated 14‑bit ADCs for real‑time monitoring of input voltage/current, battery voltage/current/temperature, and system power
Dual Serial Interfaces： Supports TWSI (I²C‑compatible) and RSB for dynamic configuration of output voltages, charge current, and interrupt conditions
Programmable Power‑Up Sequencing： Startup sequence and default voltages of DCDC/LDO are configurable to meet the strict timing requirements of various application processors
Multiple Protection Mechanisms： Integrated OVP, OCP, OTP, battery NTC thermistor sensing (hot/cold charge suspend), programmable safety timer, DCDC UVP/OVP, and LDO current limit protection
Ultra‑Low Power & Green Mode： Supports Green Mode; power‑off current <35µA (BATFET off, RTCLDO output on); supports sleep/wake/fast wake for extended standby time
Charging LED with Breathing Function： Breathing‑effect charging LED indication for intuitive charging status display
High Integration & BOM Optimization： Integrates all power MOSFETs, current sensing, and loop compensation, significantly reducing external component count and PCB area
AXP717B Applications
Tablets / E‑ink Readers： Complete power management for tablets and e‑book readers, supporting fast charge and high‑efficiency discharge
Smart Speakers： Multi‑channel stable power for main SoC and audio amplifiers, supporting battery‑powered portable models
Vacuum Robots： Highly integrated power distribution and management for main MCU, motor drivers, and sensors
AIoT Gateways： Power management core for IoT edge computing devices and smart gateways
Consumer Electronics & Portable Devices： Handheld payment terminals, portable projectors, children’s learning devices
Allwinner Processor Companion Solution： Paired with Allwinner A133, A100, and other quad‑core application processors, primarily targeting the Android/Linux tablet market
AXP717B Key Advantages
17‑Channel Power Output in a Single Chip： The AXP717B integrates 3 DCDCs and 14 LDOs – 17 power channels in total – within a tiny 6×6mm package, providing a complete power tree for a high‑performance application processor and its peripherals
NVDC Architecture for Uninterrupted System Operation： Even with a deeply discharged battery, the system powers on immediately when a charger is connected, enhancing user experience
E‑Gauge 3.0 High‑Precision Fuel Gauge Simplifies Software： Built‑in E‑Gauge 3.0 fuel gauge provides accurate battery percentage without external sense resistors or complex algorithms, drastically shortening software development cycles
3A Fast Charging + 30mΩ Ultra‑Low Rds(on) Discharge： Supports both fast charging and ultra‑low resistance discharge, delivering quick replenishment and high efficiency – ideal for battery‑powered devices
Fully Programmable Power‑Up Sequencing： Startup sequence and default voltages of DCDC/LDO are fully configurable to perfectly match Allwinner processors’ strict timing requirements
Full Type‑C & BC1.2 Compatibility： Supports USB Type‑C CC logic and BC1.2 protocol for automatic charger recognition and adaptation
Comprehensive Hardware Protection for System Safety： OVP, OCP, OTP, battery NTC sensing, safety timer, and multiple protection mechanisms ensure device and battery safety under abnormal conditions
Ultra‑Low Power Green Mode： Green Mode current <35µA, significantly extending standby time for portable devices
Dual Serial Interfaces for Flexible Configuration： TWSI (I²C‑compatible) and RSB interfaces allow dynamic adjustment of output voltages and charge current – same hardware platform adapts to different processors
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 AXP717B PMIC and what are its primary functions?
The AXP717B is a highly integrated Power Management IC (PMIC) from Allwinner, designed to supply all necessary voltage rails for application processors, smart displays, and portable devices. It combines a 3 A NVDC (Narrow Voltage DC) switch‑mode battery charger with power‑path management, 17 output channels (step‑down DC‑DC converters and low‑noise LDOs), a high‑accuracy integrated fuel gauge (E‑Gauge), and multiple protection circuits into a single QFN‑52 package. Its single‑chip design dramatically reduces BOM count and PCB area compared to discrete power solutions.
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 AXP717B 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 displays, and industrial handhelds.
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 integrated fuel gauge (E‑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 AXP717B compare to the AXP717C? Which one should I choose?
Both the AXP717B and AXP717C are members of the AXP717 family, sharing the same QFN‑52 package, 3 A NVDC charger, 17 output channels, and E‑Gauge fuel gauge. The “B” and “C” designations typically reflect minor silicon revisions or process improvements, with the “C” variant often being the later, more widely adopted version. In terms of functionality and electrical performance, they are virtually identical. Choose the AXP717B when it is already qualified in your design or when supply considerations favor it; otherwise, the AXP717C is the recommended current production version. Always refer to the latest datasheet to confirm any subtle differences in start‑up timing or default register values.
What battery types and charging profiles does the AXP717B support?
The AXP717B 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.
How do I configure and monitor the AXP717B? Is there an I²C interface?
Yes, the AXP717B 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 is the typical system efficiency of the AXP717B'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.
What is the QFN‑52 package size, and what are the key PCB design considerations?
The AXP717B 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 AXP717B PMIC?
It is widely used alongside Allwinner A‑series tablet processors and V‑series vision SoCs. Typical products include Android tablets, smart displays, video doorbells, portable DVRs, and battery‑powered AI vision devices. The AXP717B's integration of a 3 A NVDC charger, a multi‑channel power tree, and an E‑Gauge makes it an ideal single‑chip power backbone for any compact, rechargeable smart device.