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Analog Devices Inc./Maxim Integrated MAX14920ECB+
- Part No.:
- MAX14920ECB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 64-TQFP Exposed Pad
- Datasheet:
-
MAX14920ECB+.pdf
- Description:
- IC BATT MON MULTI 1-12C 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:515
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Product details
Overview
MAX14920ECB+ from Maxim Integrated is a high-accuracy 12-cell battery measurement analog front-end (AFE) IC designed for precision voltage monitoring in series-connected lithium-ion and lithium-metal phosphate battery packs up to +65V. It simultaneously samples all 12 cell voltages with ±0.5mV max error, provides unity-gain level shifting to ground reference, and integrates passive cell-balancing FET drivers and open-wire/overvoltage/undervoltage diagnostics - enabling accurate state-of-charge estimation in energy storage systems.
For engineers reviewing the MAX14920ECB+ datasheet, MAX14920ECB+ pinout, MAX14920ECB+ application, or MAX14920ECB+ equivalent, this device is selected for high-stability battery management in industrial backup, telecom, and e-transportation applications where sub-millivolt cell voltage accuracy, daisy-chain SPI control, and integrated diagnostics are required.
Technical Context
The MAX14920ECB+ implements simultaneous sampling of all 12 differential cell voltages (CV1–CV12) using internal sample-and-hold circuitry with 1µF external capacitors (CTn/CBn), followed by ground-referenced level shifting via a low-noise, self-calibrating amplifier. Its architecture supports daisy-chained SPI communication for multi-device stacks and includes dedicated BA1–BA12 gate drivers for external n-channel balancing FETs.
It features integrated diagnostics including open-wire detection on all CV inputs, programmable undervoltage/overvoltage thresholds per cell (±1.5V typical), thermal shutdown at +140°C, and a 5V LDO output (VA) with ±25mV regulation. The device operates from -40°C to +85°C and draws only 1µA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count | 12-cell monitoring (CV1–CV12); supports up to +65V stack voltage |
| Cell Voltage Accuracy | ±0.5mV max error - enables precise SOC estimation for flat-discharge chemistries like LiFePO₄ |
| Sampling Method | Simultaneous sampling of all 12 cells - eliminates inter-cell timing skew during transient load conditions |
| Level-Shifting Output | AOUT provides ground-referenced, unity-gain buffered cell difference voltage - simplifies connection to external ADC |
| Diagnostic Coverage | Per-cell UV/OV alarms, open-wire detection, thermal shutdown - reduces need for external fault monitoring circuitry |
| Interface & Control | Daisy-chainable SPI (SCLK/SDI/SDO/CS) with SAMPL control - allows scalable BMS designs with minimal GPIO usage |
| Power Management | Integrated 5V LDO (VA) with ±25mV regulation; 1µA shutdown current - supports low-power sleep modes in portable systems |
Pinout & Package
The MAX14920ECB+ is housed in a 64-pin TQFP package (10mm × 10mm) with exposed pad (EP), rated for -40°C to +85°C operation. The EP must be connected to AGND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CV1–CV12 | Differential cell voltage inputs | Accept stacked cell anode/cathode connections; CV0 tied to AGND establishes reference for level-shifting |
| BA1–BA12 | Cell-balancing gate drivers | Drive external n-channel FETs for passive balancing; each outputs 6.5–12mA sink current at +3.3V differential |
| CT1–CT12 / CB1–CB12 | Sampling capacitor terminals | Form charge-transfer network with 1µF external capacitors; CTn connects to CVn, CBn connects to CV(n−1) during sampling |
| SAMPL | Sample/hold control input | High = track mode (CVn voltages follow); falling edge triggers simultaneous hold and level-shift for readout at AOUT |
| AOUT | Buffered analog output | Ground-referenced output of selected cell voltage difference (e.g., VCVn − VCVn−1); settles to ±1mV in 5µs |
| SCLK/SDI/SDO/CS | SPI interface signals | Enable daisy-chained configuration; SDO supports back-to-back chaining without additional logic |
| VP / LDOIN / VA / VL | Power supply rails | VP = main stack supply (up to +65V); LDOIN tied to VP enables internal 5V LDO; VL = 1.62–5.5V logic supply |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating buffer amplifier | Offsets calibrated at power-up and on-demand; maintains ±0.5mV accuracy despite thermal drift |
| Integrated diagnostics | Detects open-wire faults on all CV inputs, plus per-cell UV/OV events reported via SPI status register |
| Passive balancing support | 12 dedicated BA outputs drive external FETs; pulldown resistance 10.5–21.5kΩ ensures reliable gate turn-on |
| Low-power operation | 1µA shutdown current; 1µA/10µA cell current draw minimizes parasitic drain on monitored battery pack |
| Wide operating range | Specified from -40°C to +85°C ambient; junction temperature limited to +150°C with thermal shutdown at +140°C |
Applications
| Industrial Battery Backup Systems | Telecom Battery Backup Systems |
|---|---|
|
Use Scenario: Continuous monitoring of 12S Li-ion backup banks in UPS and DC distribution systems during grid outages. IC Role / Device Role / Timing Role: Primary cell voltage AFE performing simultaneous 12-cell sampling every 100ms to feed BMS controller SOC algorithm. Use Value: ±0.5mV accuracy prevents false low-SOC triggers during shallow discharge, extending usable runtime by up to 8% in 48V systems. |
Use Scenario: Rack-mounted 12S LiFePO₄ battery modules in 48V telecom base stations requiring long-term reliability and flat-curve tracking. IC Role / Device Role / Timing Role: High-precision analog front-end providing level-shifted, ground-referenced cell voltages to isolated ADC for remote telemetry. Use Value: Simultaneous sampling eliminates inter-cell timing errors during rapid load transients common in RF transmission bursts. |
| Energy Storage Packs | e-Transportation Energy Packs |
|
Use Scenario: Modular 12-cell battery packs used in stationary energy storage (ESS) with active thermal management and cloud-based health analytics. IC Role / Device Role / Timing Role: Core voltage sensing node reporting cell-level data via SPI to local microcontroller, including diagnostic flags for predictive maintenance. Use Value: Integrated open-wire detection identifies connector degradation before catastrophic failure, reducing field service calls by ~35% in fleet deployments. |
Use Scenario: Auxiliary battery packs in electric commercial vehicles (e.g., delivery vans, buses) powering HVAC, lighting, and infotainment. IC Role / Device Role / Timing Role: Safety-critical AFE delivering real-time cell voltage and thermal data to vehicle ECU for charge/discharge limiting and fault isolation. Use Value: Thermal shutdown at +140°C and 15°C hysteresis prevent thermal runaway propagation during overtemperature events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery measurement AFE applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX14921ATJ+ | 16-cell version in 80-pin TQFP; identical architecture, accuracy, and feature set - differs only in pin count and cell count support | Required when monitoring >12 cells (e.g., 16S Li-ion stacks); not pin-compatible due to larger package and extra pins | Select MAX14921ATJ+ only if 16-cell coverage is needed; MAX14920ECB+ remains optimal for cost- and space-constrained 12S designs. |
| BQ7695203RGER | Texas Instruments 16-cell AFE with integrated protection FET drivers, higher integration (no external LDO needed), but ±1.5mV typical accuracy vs. ±0.5mV max for MAX14920ECB+ | Used in TI-based BMS platforms with integrated MCU; lacks daisy-chain SPI simplicity and requires more complex calibration | Choose MAX14920ECB+ when sub-millivolt accuracy and SPI daisy-chaining are prioritized over integrated protection logic. |
Compared with MAX14921ATJ+, the MAX14920ECB+ offers identical performance in a smaller 64-pin footprint optimized for 12-cell systems, while BQ7695203RGER trades absolute accuracy for higher integration - making MAX14920ECB+ the preferred choice for precision-focused, modular BMS architectures.
Availability
MAX14920ECB+ is available at Aetrix Electronics and suitable for industrial battery backup systems, telecom battery backup systems, and energy storage packs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX14920ECB+ 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
Maxim Integrated, now part of Analog Devices, designs high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX14920ECB+ belongs to Maxim's battery management AFE product line, engineered specifically for high-accuracy, multi-cell voltage monitoring in safety-critical energy storage and transportation systems.
FAQ
What is the maximum battery stack voltage supported by the MAX14920ECB+?
The MAX14920ECB+ supports battery stacks up to +65V, with its VP supply pin rated from +6V to +65V. This enables reliable monitoring of up to 12 lithium-ion cells (nominal 3.7V/cell) or 16 LiFePO₄ cells (nominal 3.2V/cell) in series. The device's CV2–CV12 inputs tolerate voltages up to +65V referenced to CV0 (AGND), ensuring safe operation across full-stack transients.
Does the MAX14920ECB+ require external components for basic operation?
Yes - the MAX14920ECB+ requires external 1µF sampling capacitors (CTn/CBn pairs), bypass capacitors (0.1µF on VL and VP, 1µF on VA), and external n-channel FETs for passive balancing driven by BA1–BA12. No external op-amps or level-shifters are needed, as the AOUT buffer and internal LDO eliminate those subsystems.
How does the MAX14920ECB+ handle cell voltage calibration?
The MAX14920ECB+ performs automatic self-calibration of its buffer amplifier offset at power-up and supports on-demand calibration via SPI command. Calibration takes 8ms and corrects for initial offset and thermal drift, maintaining the guaranteed ±0.5mV cell voltage error across -40°C to +85°C without external intervention.
Can the MAX14920ECB+ be used in daisy-chain configurations?
Yes - the MAX14920ECB+ supports true daisy-chained SPI topology: SDO of one device connects directly to SDI of the next, with shared SCLK, CS, and SAMPL lines. This allows scalable monitoring of large battery packs (e.g., 48S) using a single microcontroller SPI port and minimal PCB routing.
What diagnostic functions are integrated into the MAX14920ECB+?
The MAX14920ECB+ integrates open-wire detection on all CV inputs, per-cell undervoltage/overvoltage comparators (configurable thresholds), and thermal shutdown at +140°C with 15°C hysteresis. All diagnostics generate flag bits accessible via SPI status registers, enabling automated fault response without host CPU polling overhead.
MAX14920ECB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 64-TQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1 ~ 12
- Fault Protection:
- Over Temperature, Over/Under Voltage
- Interface:
- SPI
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP-EP (10x10)
MAX14920ECB+ FAQ
1.How can I place an order for MAX14920ECB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14920ECB+ 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 MAX14920ECB+ reliable?
The price and inventory of MAX14920ECB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14920ECB+ is usually 5 days.
3.What payment methods are accepted for MAX14920ECB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14920ECB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14920ECB+?
MAX14920ECB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14920ECB+ 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 MAX14920ECB+?
For technical support, including MAX14920ECB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14920ECB+ requirements.
6.How does Aetrix verify that MAX14920ECB+ is sourced from the original manufacturer or authorized distributors?
All MAX14920ECB+ 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 MAX14920ECB+ meets industry standards.
7.What is the process for return or replacement of MAX14920ECB+?
All MAX14920ECB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX14920ECB+, 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 MAX14920ECB+ part is unused and in its original packaging.
Return procedure for MAX14920ECB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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