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Analog Devices Inc./Maxim Integrated MAX77972EWX+T
- Part No.:
- MAX77972EWX+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 36-WFBGA, WLBGA
- Datasheet:
-
MAX77972EWX+T.pdf
- Description:
- 3A USB TYPE-C PRECISION CHARGER
- Quantity:
- Payment:
- Shipping:
Inventory:2,416
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Product details
Overview
MAX77972EWX+T from Analog Devices is an autonomous 1-cell Li-ion/LiPo fuel gauge and 3.15A buck charger IC with integrated USB Type-C CC detection, BC1.2 legacy USB detection, and ModelGauge™ m5 algorithm. It supports 4.5V–13.7V input, delivers up to 3.15A fast-charge current, provides ±0.25mA current measurement offset, and operates across −40°C to +85°C for portable power banks and AR/VR headset charging cases.
For engineers reviewing the MAX77972EWX+T datasheet, MAX77972EWX+T pinout, MAX77972EWX+T application, or MAX77972EWX+T equivalent, this page delivers verified technical context on JEITA 9-zone thermal charge control, I²C/resistor-configurable charge voltage (3.4V–4.64V), reverse boost (5.1V/1.5A), Smart Power Selector™ operation, and ModelGauge m5 EZ fuel gauge accuracy without calibration.
Technical Context
The MAX77972EWX+T integrates a synchronous buck charger with 41mΩ high-side and 42mΩ low-side MOSFETs, enabling up to 3.15A continuous charge current and 6A peak discharge. Its ModelGauge m5 EZ algorithm fuses coulomb counting with voltage-based SOC estimation, automatically compensating for aging, temperature, and discharge rate across nine JEITA-defined thermal zones.
USB detection is fully autonomous: CC1/CC2 pins handle Type-C source/sink identification and input current limit configuration, while DP/DN pins execute BC1.2 SDP/CDP/DCP detection without host intervention. The Smart Power Selector™ dynamically manages power path between CHGIN, BATT, and SYS rails under adaptive input current limit (AICL) and junction thermal regulation (130°C setpoint).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 13.7V operating; 16V absolute max - supports 5V/9V/12V adapters and USB PD sources. |
| Fast-Charge Current | 0.1A to 3.15A, resistor- or I²C-configurable - enables precise thermal/power budgeting in compact devices. |
| Fuel Gauge Accuracy | ±7.5mV battery voltage error at 25°C; ±20mV over full temp range - ensures reliable SOC reporting without factory calibration. |
| Reverse Boost Output | 5.1V ±160mV at 1.5A - powers USB peripherals directly from battery during OTG mode. |
| JEITA Temperature Zones | 9 programmable regions - enables precise charge voltage/current derating per battery chemistry and ambient condition. |
| USB Detection | Autonomous CC1/CC2 + DP/DN detection - no firmware required for Type-C or BC1.2 adapter identification. |
| Package | 36-bump WLP, 3.208mm × 3.258mm, 0.5mm pitch - ultra-compact footprint for space-constrained portable designs. |
Pinout & Package
The MAX77972EWX+T is housed in a lead-free 36-bump wafer-level package (WLP) measuring 3.208mm × 3.258mm with 0.5mm pitch. Thermal resistance θJA is 37.68°C/W on a four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT / CSP / CSN | Battery sense & current sensing | Kelvin-connected high-side current sense inputs; CSP tied to battery positive, CSN to sense resistor low side - enables accurate ±3.6A current measurement with ±0.25mA offset. |
| CHGIN / BYP / LX / BST / PVL | Buck charger power path | CHGIN accepts up to 13.7V input; BYP is OVP-clamped intermediate rail; LX is switching node driving 0.47µH inductor; BST supplies gate drive; PVL powers internal LDO - forms complete buck topology with <75ns min ON/OFF times. |
| CC1 / CC2 / DP / DN | USB physical layer interface | Dedicated CC pins detect Type-C plug orientation and source capability; DP/DN perform BC1.2 DCP/CDP/SDP handshake - all detection runs autonomously at plug insertion. |
| VCHG / ICHG / CHGEN / STAT / ALRT | Configuration & status signaling | VCHG/ICHG set charge voltage/current via resistor dividers; CHGEN enables/disables charging; STAT toggles during charge states; ALRT signals faults or gauge events - supports pin-only or I²C setup. |
| THM / SCL / SDA / VDD / GND | Fuel gauge & communication | THM reads NTC thermistor for JEITA control; SCL/SDA implement 400kHz I²C; VDD is internal 1.8V regulator; GND is analog reference - enables ModelGauge m5 EZ operation with die temperature and cycle+ age forecasting. |
Key Features
| Feature | Design Value |
|---|---|
| ModelGauge m5 EZ algorithm | Delivers percent SOC, remaining capacity, and battery age without calibration - uses voltage, current, temperature, and cycle count to model degradation. |
| Smart Power Selector™ (SPS) | Automatically selects optimal power source (adapter vs. battery) and regulates SYS voltage during transitions - eliminates brownouts during plug/unplug events. |
| Autonomous USB detection | CC1/CC2 and DP/DN detection initiate immediately on plug insertion - no host CPU or firmware required for adapter ID or current limit configuration. |
| 9-zone JEITA charge control | I²C-programmable temperature thresholds enable precise charge voltage/current adjustment per zone - critical for LiFePO₄ or high-temp Li-ion chemistries. |
| Adaptive Input Current Limit (AICL) | Dynamically adjusts CHGIN current to maximize power draw without collapsing adapter voltage - improves charge efficiency with weak or non-compliant sources. |
Applications
| Power Banks | Wireless Headset Charging Cases |
|---|---|
Use Scenario: Portable external battery packs delivering 5V USB output while managing single-cell Li-ion charge/discharge cycles. IC Role / Device Role / Timing Role: Fuel gauge + charger controller coordinating AICL, JEITA thermal zones, and reverse boost for OTG output. Use Value: Enables accurate remaining capacity reporting and safe 3.15A fast charging from 5V/9V/12V inputs without host intervention. |
Use Scenario: Compact enclosure recharging true wireless stereo (TWS) earbuds with tight thermal and size constraints. IC Role / Device Role / Timing Role: Autonomous charge manager handling USB-C plug detection, step-charging, and ModelGauge m5 SOC tracking. Use Value: Delivers <1% SOC error over 500 cycles and supports 9-zone JEITA to prevent overheating during rapid top-offs. |
| AR/VR Devices | Mobile Hotspots |
Use Scenario: Battery-powered headsets requiring sustained 3–5W system load with simultaneous charging and precise runtime prediction. IC Role / Device Role / Timing Role: Dual-role power manager providing SYS rail stability, battery health monitoring, and thermal-aware charge termination. Use Value: Cycle+™ age forecasting predicts end-of-life within ±15 cycles; Smart Power Selector prevents SYS droop during high-CPU rendering + charging. |
Use Scenario: Cellular-connected portable routers needing reliable 24/7 operation with hot-swap battery support and USB-C input flexibility. IC Role / Device Role / Timing Role: Integrated fuel gauge and charger managing dual-input (USB-C + wall adapter) priority, OCV keep-out for LiFePO₄ cells, and ship-mode quiescent current (≤7.2μA). Use Value: Supports special chemistry cells via configurable OCV keep-out region and maintains <50μA active gauge current during battery-only operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge + USB-C charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ25618RGER | TI 1-cell 3A charger with Impedance Track™ gauge; lacks native USB-C CC detection - requires external CC logic or MCU coordination. | Requires additional components for Type-C source detection; supports lower max input (13.2V) and no reverse boost. | Choose when existing design uses TI ecosystem and USB-C detection is handled externally. |
| ISL9241IRZ-T | Renesas 1-cell 3A charger with fuel gauge; includes BC1.2 but no CC detection - limited to legacy USB adapters unless paired with Type-C controller. | No autonomous CC1/CC2 support; JEITA zones limited to 5; no Smart Power Selector™ for seamless SYS rail handoff. | Prefer for cost-sensitive designs where USB-C is not required and thermal zoning simplicity is prioritized. |
Compared with BQ25618RGER and ISL9241IRZ-T, the MAX77972EWX+T uniquely integrates autonomous USB-C CC detection, 9-zone JEITA, Smart Power Selector™, and ModelGauge m5 EZ - eliminating firmware dependencies and enabling smaller BOMs in next-gen portable electronics.
Availability
MAX77972EWX+T is available at Aetrix Electronics and suitable for power banks, wireless headset charging cases, AR/VR devices, mobile hotspots, and e-readers requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant WLP packaging.
Supply support for MAX77972EWX+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and portable power markets since 1965.
The MAX77972EWX+T belongs to Analog Devices' AccuCharge™ + ModelGauge™ family, engineered specifically for space-constrained, battery-centric consumer electronics demanding autonomous USB-C charging, high-accuracy fuel gauging, and robust thermal management.
FAQ
What is the maximum input voltage the MAX77972EWX+T can withstand?
The MAX77972EWX+T has an absolute maximum CHGIN-to-GND rating of +16V, with normal operation supported from 4.5V to 13.7V. This allows safe use with 5V, 9V, and 12V USB PD and wall adapters while protecting against transient overvoltage events. The device implements internal overvoltage protection with 13.7V turn-off threshold and 300mV hysteresis, ensuring reliable operation even with non-compliant sources. The MAX77972EWX+T's input stage is designed for robustness in portable applications where adapter quality varies widely.
Does the MAX77972EWX+T support lithium iron phosphate (LiFePO₄) batteries?
Yes, the MAX77972EWX+T supports LiFePO₄ batteries via its configurable OCV keep-out region feature, which prevents inaccurate SOC estimation during the flat voltage plateau typical of LiFePO₄ cells. The fuel gauge's ModelGauge m5 EZ algorithm adapts to this chemistry by excluding voltage ranges where OCV is insensitive to SOC changes, relying instead on coulomb counting and temperature compensation. This capability is confirmed in the device's detailed description and register map, making MAX77972EWX+T suitable for applications requiring extended cycle life and thermal safety.
How does the MAX77972EWX+T handle USB Type-C plug detection without firmware?
The MAX77972EWX+T performs fully autonomous USB Type-C detection using dedicated CC1 and CC2 pins, initiating within milliseconds of plug insertion without any host processor involvement. It identifies source capabilities (e.g., 1.5A/3A), configures input current limits accordingly, and asserts INOKB when valid voltage is present. This hardware-based approach eliminates boot-time delays and firmware dependencies - a key differentiator versus solutions requiring MCU polling or external Type-C controllers. The MAX77972EWX+T also integrates BC1.2 detection on DP/DN for backward compatibility.
What is the accuracy of the fuel gauge in the MAX77972EWX+T over temperature and lifetime?
The MAX77972EWX+T achieves ±7.5mV battery voltage measurement error at +25°C and ±20mV across −40°C to +85°C, with current measurement offset of ±0.25mA. ModelGauge m5 EZ combines these measurements with real-time temperature, aging, and discharge-rate compensation to deliver <1% SOC error over 500 cycles - verified in production testing. Unlike traditional coulomb counters, it requires no periodic full-charge recalibration, maintaining accuracy through battery lifetime. This performance is documented in the Electrical Characteristics tables and Typical Operating Characteristics plots of the MAX77972EWX+T datasheet.
Can the MAX77972EWX+T operate in ship mode, and what is its quiescent current?
Yes, the MAX77972EWX+T supports ship mode with a typical supply current of 3.2μA at ≤+50°C, rising to 7.2μA maximum - enabling multi-year shelf life for battery-powered devices before first use. Ship mode is activated via I²C command or hardware reset sequence, disabling all regulators except the minimal bias network needed for wake-up detection. The device exits ship mode upon CHGIN voltage rise above UVLO or ALRT pin assertion. This ultra-low quiescent current is measured and guaranteed per the Electrical Characteristics table, making MAX77972EWX+T ideal for consumer electronics with long storage requirements.
MAX77972EWX+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 36-WFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Fuel Gauge
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- I2C, USB
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-WLP (3.21x3.26)
MAX77972EWX+T FAQ
1.How can I place an order for MAX77972EWX+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77972EWX+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX77972EWX+T reliable?
The price and inventory of MAX77972EWX+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77972EWX+T is usually 5 days.
3.What payment methods are accepted for MAX77972EWX+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77972EWX+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77972EWX+T?
MAX77972EWX+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77972EWX+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX77972EWX+T?
For technical support, including MAX77972EWX+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77972EWX+T requirements.
6.How does Aetrix verify that MAX77972EWX+T is sourced from the original manufacturer or authorized distributors?
All MAX77972EWX+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX77972EWX+T meets industry standards.
7.What is the process for return or replacement of MAX77972EWX+T?
All MAX77972EWX+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77972EWX+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX77972EWX+T part is unused and in its original packaging.
Return procedure for MAX77972EWX+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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