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Analog Devices Inc./Maxim Integrated MAX17320X20+
- Part No.:
- MAX17320X20+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 30-WFBGA, WLBGA
- Datasheet:
-
MAX17320X20+.pdf
- Description:
- IC BATT FUEL LI-ION 2-4C 30WLP
- Quantity:
- Payment:
- Shipping:
Inventory:135
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Product details
Overview
MAX17320X20+ from Analog Devices is a stand-alone 2S–4S lithium-ion/polymer battery fuel gauge IC with integrated protector, internal self-discharge detection, SHA-256 authentication, and ModelGauge m5 EZ algorithm. It delivers ±1% state-of-charge accuracy over life, monitors voltage/current/temperature across up to four cells, and provides JEITA-compliant charging prescriptions using external high-side N-FETs - deployed in smartphones, medical wearables, and smart battery packs.
For engineers reviewing the MAX17320X20+ datasheet, MAX17320X20+ pinout, MAX17320X20+ application, or MAX17320X20+ equivalent, key selection considerations include its 38μA quiescent current in active protection mode, internal FET cell balancing, 64-bit unique ID + 160-bit SHA-256 secret key, and dual-interface support (1-Wire® or I²C/SMBus) for secure telemetry and configuration in space-constrained pack-side designs.
Technical Context
The MAX17320X20+ implements a hybrid fuel-gauge architecture combining coulomb counting with voltage-based OCV estimation via the ModelGauge m5 EZ algorithm, enabling accurate SOC reporting without periodic full-charge calibration. It integrates dedicated analog front-end circuitry for simultaneous 4-cell voltage measurement, ±1°C thermistor monitoring (4 channels), and die temperature sensing.
Protection logic executes real-time threshold comparisons for overvoltage, undervoltage, overcurrent (fast/slow), over/undertemperature, and internal self-discharge - all configurable via nonvolatile registers. Cell balancing uses internal FETs with programmable thresholds and duty cycle control, while dynamic power estimation calculates instantaneous max system output power without violating minimum input voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 2–4 series Li-ion/Li-polymer cells - enables direct integration into multi-cell portable and industrial battery packs without external multiplexing. |
| Fuel Gauge Accuracy | ±1% state-of-charge error over battery lifetime - achieved via ModelGauge m5 EZ algorithm with automatic aging, temperature, and rate compensation. |
| Quiescent Current | 38μA with FETs enabled - sustains long-term pack monitoring during storage or standby without significant self-discharge impact. |
| Interface Options | Configurable 1-Wire® or 2-wire I²C/SMBus - supports legacy 1-Wire systems or standard I²C host controllers with SBS 1.1 register compatibility. |
| Authentication | Integrated SHA-256 engine with 160-bit secret key + unique 64-bit ID - prevents unauthorized battery cloning and enables secure firmware updates. |
| Cell Balancing | Internal FET-based passive balancing - eliminates need for external balancing resistors or controllers; reduces BOM count and PCB area. |
| LDO Output | Configurable always-on LDO - powers critical system loads (e.g., MCU RTC, sensors) directly from pack voltage, even during fault conditions. |
Pinout & Package
The MAX17320X20+ is packaged in a lead-free, 2.4mm × 2.6mm, 30-bump WLP (0.4mm pitch), optimized for ultra-compact battery pack integration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CELL1–CELL4 | Cell voltage sense inputs | Direct connection to individual cell terminals for precise per-cell voltage monitoring and balancing control. |
| TH1–TH4 | Thermistor inputs | Supports four independent NTC/PTC thermistors for comprehensive thermal profiling of cells and pack environment. |
| PACK+, PACK− | Main pack terminals | High-current paths for charge/discharge current sensing and protection FET switching; connect to external high-side N-FETs. |
| CHG, DIS | Protection FET gate drivers | Drive external high-side N-channel FETs for charge and discharge path control; support ideal diode behavior during faults. |
| SCL/OD, SDA/DQ | Configurable interface pins | Shared pins for either I²C clock/data or 1-Wire data - selected at power-up via hardware strap or register setting. |
| ALRT* | Open-drain alert output | Asserts on protection events (OV, UV, OT, etc.) or fuel gauge alarms (low SOC, age warning); supports wired-OR interrupt bus. |
| PCKP | Pack presence detection | Monitors pack insertion/removal status; used for wake-up and system initialization sequencing. |
| GND | Analog/digital ground reference | Single ground plane required; low-impedance return path essential for precision analog measurements and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| ModelGauge m5 EZ algorithm | Delivers percent SOC, remaining capacity (mAh), time-to-empty/full, and Cycle+™ age forecast without factory calibration or full-charge cycles. |
| Internal self-discharge detection (ISD) | Identifies abnormal cell leakage currents down to ~1μA, enabling early failure prediction and warranty analytics in deployed packs. |
| JEITA-compliant charging prescription | Automatically adjusts charge voltage/current limits based on real-time cell temperature - ensures safe charging across -10°C to +60°C ambient. |
| Pushbutton wakeup | Eliminates system-side power consumption until physical button press - extends shelf life and simplifies low-power design for consumer devices. |
| Nonvolatile history logging | Stores 84 bytes of user data plus cycle-resolved battery health metrics (voltage min/max, temp extremes, fault logs) across power cycles. |
Applications
| Smartphones & Tablets | Medical Wearables |
|---|---|
Use Scenario: Multi-cell battery pack in slim-profile mobile devices requiring precise runtime estimation and safety compliance. IC Role / Device Role / Timing Role: Pack-side fuel gauge and protector - performs real-time SOC, health, and JEITA-compliant charge control independent of host processor. Use Value: Enables <1% SOC error over 500 cycles and prevents thermal runaway during fast charging - critical for UL/IEC 62133 certification. | Use Scenario: Rechargeable battery in FDA-cleared glucose monitors or ECG patches where runtime predictability impacts clinical reliability. IC Role / Device Role / Timing Role: Autonomous battery manager - logs cycle count, temperature excursions, and internal self-discharge for regulatory traceability and predictive maintenance. Use Value: Provides Cycle+™ age forecast and nonvolatile fault history - satisfies ISO 13485 data retention requirements for Class II medical devices. |
| Power Tools | Smart Battery Backup Systems |
Use Scenario: High-drain 4S Li-ion pack in cordless drills operating under variable load and temperature extremes. IC Role / Device Role / Timing Role: Primary protector and fuel gauge - enforces overcurrent/overtemperature cutoffs within 100μs and balances cells during rest periods. Use Value: Internal FET balancing extends usable capacity by >8% after 200 cycles; dynamic power estimation prevents brownouts during peak torque events. | Use Scenario: Uninterruptible power supply (UPS) module for network edge equipment requiring tamper-resistant battery authentication. IC Role / Device Role / Timing Role: Secure pack identity manager - validates SHA-256 signatures during system boot and rejects cloned or counterfeit batteries. Use Value: 160-bit secret key + unique 64-bit ID blocks unauthorized replacements - maintains OEM service contracts and prevents warranty fraud. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge with protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ40Z50-R1 | TI device uses coulomb counter + voltage model but lacks internal self-discharge detection and SHA-256 engine; requires external authentication IC. | Targeted at cost-sensitive industrial packs without security mandates; supports 3–4S but no SmartEmpty or ideal diode discharge. | Select when SHA-256 and ISD are not required, and existing TI ecosystem tools (bqStudio) are preferred. |
| MAX17321X20+ | Same package and pinout; adds secondary protector with independent overvoltage/overcurrent comparators and fuse monitoring. | Required for UL 2054/IEC 62133 dual-protection compliance in premium consumer electronics and e-mobility. | Select when redundant hardware-level protection is mandated - MAX17321X20+ provides fail-safe backup to primary protection logic. |
Compared with BQ40Z50-R1 and MAX17321X20+, the MAX17320X20+ uniquely combines 38μA IQ, internal FET balancing, and embedded SHA-256 in a 2.4mm × 2.6mm WLP - offering optimal trade-off between security, accuracy, and size for mid-tier smart battery applications.
Availability
MAX17320X20+ is available at Aetrix Electronics and suitable for smartphones, medical wearables, and power tools requiring stable component supply, long-term lifecycle support, and secure battery authentication.
Supply support for MAX17320X20+ 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 (acquired Maxim Integrated in 2021) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.
The MAX17320 belongs to Maxim's ModelGauge™ m5 fuel gauge product line, engineered specifically for secure, accurate, and autonomous battery management in space-constrained, safety-critical portable systems.
FAQ
What is the primary function of the MAX17320X20+ in a battery pack?
The MAX17320X20+ serves as a stand-alone pack-side fuel gauge and protector for 2S–4S lithium-ion/polymer batteries. It precisely measures voltage, current, and temperature; computes state-of-charge using the ModelGauge m5 EZ algorithm; enforces safety thresholds (overvoltage, overtemperature, etc.) via external FETs; and provides SHA-256 authentication. The MAX17320X20+ operates autonomously without host intervention, making it ideal for sealed smart battery modules.
Does the MAX17320X20+ support both I²C and 1-Wire interfaces simultaneously?
No - the MAX17320X20+ uses shared pins (SCL/OD and SDA/DQ) configured at power-up for either I²C/SMBus or 1-Wire operation, not both concurrently. Interface selection is determined by hardware strapping (e.g., pull-up/down on PCKP) or initial register write. The MAX17320X20+ implements full SBS 1.1 register compatibility in I²C mode and supports standard 1-Wire command sets, ensuring interoperability with existing host firmware stacks.
How does the internal self-discharge detection (ISD) feature work in the MAX17320X20+?
The MAX17320X20+ detects abnormal internal self-discharge by monitoring open-circuit voltage decay rates across multiple cells during rest periods. It compares measured voltage drift against statistically derived baselines and triggers an alert when leakage exceeds ~1μA per cell. This capability is implemented entirely in firmware using stored voltage history and requires no external components. The MAX17320X20+ logs ISD events in nonvolatile memory for field failure analysis and warranty validation.
What packaging options are available for the MAX17320X20+?
MAX17320X20+ is offered exclusively in a 2.4mm × 2.6mm, 30-bump wafer-level package (WLP) with 0.4mm pitch - optimized for ultra-thin battery pack integration. Unlike earlier variants (e.g., MAX17320G20+ in TQFN), the X20+ suffix denotes this specific WLP variant. No TQFN or other package options are available for the MAX17320X20+; design-in requires adherence to the WLP footprint and reflow profile specified in Analog Devices' package drawing 21-0209.
Can the MAX17320X20+ perform cell balancing without external components?
Yes - the MAX17320X20+ integrates MOSFET switches for passive cell balancing across all supported cells (2–4S). Balancing is triggered automatically when cell voltage deviation exceeds the programmable nBalTh threshold (default 20mV), with adjustable duty cycle and current limit. No external resistors, controllers, or timing components are needed. The MAX17320X20+ manages balancing during rest periods or low-load conditions to minimize impact on system runtime and thermal performance.
MAX17320X20+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- ModelGauge™
- Package/Case:
- 30-WFBGA, WLBGA
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Fuel Gauge
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1 ~ 4
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 30-WLP (2.37x2.55)
MAX17320X20+ FAQ
1.How can I place an order for MAX17320X20+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17320X20+ 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 MAX17320X20+ reliable?
The price and inventory of MAX17320X20+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17320X20+ is usually 5 days.
3.What payment methods are accepted for MAX17320X20+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17320X20+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17320X20+?
MAX17320X20+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17320X20+ 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 MAX17320X20+?
For technical support, including MAX17320X20+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17320X20+ requirements.
6.How does Aetrix verify that MAX17320X20+ is sourced from the original manufacturer or authorized distributors?
All MAX17320X20+ 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 MAX17320X20+ meets industry standards.
7.What is the process for return or replacement of MAX17320X20+?
All MAX17320X20+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17320X20+, 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 MAX17320X20+ part is unused and in its original packaging.
Return procedure for MAX17320X20+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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