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Analog Devices Inc./Maxim Integrated MAX14920ECB+T
- Part No.:
- MAX14920ECB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 64-TQFP Exposed Pad
- Datasheet:
-
MAX14920ECB+T.pdf
- Description:
- IC BATT MON MULTI 1-12C 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
MAX14920ECB+T from Maxim Integrated is a high-accuracy 12-cell battery measurement analog front-end (AFE) IC for lithium-ion and lithium-metal phosphate battery packs up to +65V. It simultaneously samples all 12 cell voltages with ±0.5mV max error, provides ground-referenced level shifting, and integrates passive cell-balancing FET drivers and self-calibrating buffer amplifiers - enabling precise state-of-charge estimation in industrial energy storage systems.
For engineers reviewing the MAX14920ECB+T datasheet, MAX14920ECB+T pinout, MAX14920ECB+T application, or MAX14920ECB+T equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts, and supply-ready availability details - all specific to the 64-pin TQFP-EP package and -40°C to +85°C operation.
Technical Context
The MAX14920ECB+T implements simultaneous sampling across 12 differential cell inputs (CV0–CV12), using internal sample-and-hold with 1µF external capacitors on CT/ CB pins to capture voltage differences with <±0.5mV error. Its integrated +5V LDO (VA output), daisy-chainable SPI interface, and open-wire/overvoltage/undervoltage diagnostics support robust BMS subsystems without external supervision logic.
Level shifting is achieved via unity-gain buffered differential-to-single-ended conversion at AOUT, referenced to CV0 (AGND), eliminating need for isolated ADCs. The device supports passive balancing via 12 dedicated BA_ outputs driving external n-channel FETs, with pulldown resistance of 10.5–21.5kΩ and guaranteed 6.5–12mA balancing current per channel at 4.5V differential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count | 12-cell monitoring (CV0–CV12), supporting up to +65V stack voltage |
| Cell Voltage Accuracy | ±0.5mV max error - enables reliable SOC estimation for flat-discharge chemistries like LiFePO₄ |
| Sampling Method | Simultaneous sampling of all cells - eliminates inter-cell timing skew during transient load events |
| LDO Output | +5V (±2.5%) VA output with 10mA load capability - powers internal circuitry and optional external logic |
| Operating Temp | -40°C to +85°C - qualified for industrial and telecom backup battery environments |
| Shutdown Current | 1µA - enables ultra-low-power battery-backed monitoring during system sleep |
| Interface | Daisy-chainable SPI (CS, SCLK, SDI, SDO) - allows scalable multi-IC BMS architectures with minimal GPIO use |
Pinout & Package
The MAX14920ECB+T is housed in a 64-pin TQFP-EP package (10mm × 10mm) with exposed pad connected to AGND for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CV0–CV12 | Differential cell voltage inputs | CV0 = reference (AGND); CV1–CV12 connect to cell anode/cathode nodes - enable measurement of 12 stacked cells |
| BA1–BA12 | Cell-balancing gate drivers | Open-drain outputs driving external n-FET gates - support passive balancing with 6.5–12mA sink current per channel |
| CT1–CT12 / CB1–CB12 | Sampling capacitor terminals | CTn connects to CVn; CBn connects to CVn−1 during SAMPL high - forms charge-transfer network for accurate hold-phase readout |
| SAMPL, SCLK, SDI, SDO, CS, EN | SPI control and sampling trigger | SAMPL edge initiates hold phase; SPI reads AOUT sequentially - no external ADC required for basic operation |
| AOUT | Buffered analog output | Ground-referenced single-ended output of selected cell voltage difference - directly interfaces to standard SAR ADCs |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating amplifier | Offset calibration at power-up and on-demand - maintains ±0.5mV accuracy despite thermal drift over temperature |
| Integrated diagnostics | Detects open-wire faults, cell undervoltage (+1.4V to +1.6V threshold), overvoltage (up to VA), and thermal shutdown at +140°C |
| Level-shifted output | AOUT presents ground-referenced voltage equal to VCVn − VCVn−1 - eliminates need for isolated or high-voltage ADCs |
| Low-power operation | 1µA shutdown mode and 1µA/10µA per-cell current draw - extends runtime in always-on battery monitor applications |
| Robust input protection | CV inputs rated to +65V VP; absolute max ratings include -0.3V to +70V on VP and -0.3V to +6V on CV1–CV12 |
Applications
| Industrial Battery Backup Systems | Telecom Battery Backup Systems |
|---|---|
|
Use Scenario: Continuous monitoring of 12S Li-ion backup banks in UPS and DC plant systems during grid outages. IC Role / Device Role / Timing Role: Primary cell voltage AFE performing simultaneous 12-cell sampling and level-shifting for downstream ADC. Use Value: ±0.5mV accuracy ensures reliable end-of-discharge detection before critical system shutdown. |
Use Scenario: Remote telecom base station battery management where maintenance access is infrequent. IC Role / Device Role / Timing Role: Standalone BMS front-end handling cell voltage, temperature (T1–T3), and balancing control via SPI. Use Value: Integrated diagnostics (open-wire, UV/OV) reduce false alarms and extend field service intervals. |
| Energy Storage Packs | e-Transportation Energy Packs |
|
Use Scenario: Modular 12S stationary energy storage units with distributed balancing and centralized MCU control. IC Role / Device Role / Timing Role: Daisy-chained AFE node providing synchronized cell data to master controller over SPI. Use Value: Simultaneous sampling prevents SOC miscalculation during high-dV/dt charge/discharge transients. |
Use Scenario: Auxiliary battery pack in electric commercial vehicles requiring ASIL-B–compatible monitoring. IC Role / Device Role / Timing Role: Safety-critical cell voltage conditioner feeding redundant ADC paths in dual-core safety MCU. Use Value: Thermal shutdown (+140°C) and 15°C hysteresis prevent thermal runaway propagation in confined battery enclosures. |
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+T | 16-cell version in 80-pin TQFP; identical architecture, accuracy, and features - adds 4 extra CV/BA/CT/CB channels | Required for >12-cell stacks (e.g., 16S EV modules); larger footprint and higher pin count increase PCB area and routing complexity | Select MAX14921ATJ+T only when expanding beyond 12 cells - not drop-in compatible due to pin count and package size mismatch |
| BQ7695203RGER | Texas Instruments 16-cell AFE with integrated ADC, Coulomb counter, and enhanced safety features (ASIL-B ready); ±1.5mV typical cell voltage error | Includes embedded MCU, hardware protection, and JTAG debug - targets automotive-grade BMS with functional safety certification | Choose BQ7695203RGER for safety-certified designs needing integrated processing; MAX14920ECB+T remains optimal for cost-sensitive industrial systems requiring minimal external components |
Compared with MAX14921ATJ+T, the MAX14920ECB+T offers identical accuracy and diagnostics in a smaller 64-pin package - ideal for space-constrained 12-cell systems. Against BQ7695203RGER, it trades integrated safety logic for lower BOM cost and simpler layout, prioritizing precision over functional safety compliance.
Availability
MAX14920ECB+T 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 traceable sourcing.
Supply support for MAX14920ECB+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
Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX14920/MAX14921 product line targets high-accuracy battery monitoring in multicell systems - engineered for flat-discharge chemistries and harsh thermal environments with simultaneous sampling and integrated diagnostics.
FAQ
What is the maximum battery stack voltage supported by the MAX14920ECB+T?
The MAX14920ECB+T supports battery stacks up to +65V, with VP pin rated from +6V to +65V. This enables safe monitoring of up to 12 series-connected lithium-ion cells (typically ~54V nominal) or 16 LiFePO₄ cells (~51V nominal), while maintaining ±0.5mV measurement accuracy across the full operating temperature range of -40°C to +85°C. The device's CV input structure and level-shifting architecture ensure signal integrity even at maximum stack voltage.
Does the MAX14920ECB+T require an external ADC?
Yes, the MAX14920ECB+T requires an external ADC to digitize its AOUT signal. It outputs a ground-referenced, level-shifted analog voltage representing the differential voltage between two adjacent cells (e.g., VCVn − VCVn−1). While the MAX14920ECB+T performs precision buffering, sampling, and self-calibration, it does not include an integrated ADC - enabling system designers to select ADC resolution, speed, and isolation based on application requirements.
How does the MAX14920ECB+T support passive cell balancing?
The MAX14920ECB+T supports passive cell balancing through 12 dedicated BA1–BA12 outputs, each capable of sinking 6.5–12mA at +4.5V differential. These open-drain drivers control external n-channel FETs connected across individual cells. Balancing is initiated via SPI commands, and the device monitors cell voltage thresholds to autonomously trigger balancing when undervoltage or overvoltage conditions occur - all without host MCU intervention.
What is the function of the CT and CB pins on the MAX14920ECB+T?
The CT (capacitor terminal high) and CB (capacitor terminal low) pins form the external sampling network for each cell. During the SAMPL-high phase, CTn connects internally to CVn and CBn to CVn−1; a 1µF capacitor between them stores the differential voltage. When SAMPL falls, the charge is held and level-shifted to AOUT. This architecture enables high-accuracy, simultaneous sampling independent of cell position in the stack - critical for accurate SOC under dynamic load.
Can the MAX14920ECB+T operate without its internal LDO enabled?
Yes, the MAX14920ECB+T can operate with the internal LDO disabled. By connecting LDOIN to VA instead of VP, the device uses an external +5V supply for VA, bypassing the internal regulator. In this configuration, VA must be supplied externally within +4.75V to +5.25V, and the LDO remains inactive. This option reduces power dissipation and improves efficiency in systems with tightly regulated 5V rails - while preserving all core AFE functionality including cell measurement, diagnostics, and balancing control.
MAX14920ECB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 64-TQFP Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX14920ECB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX14920ECB+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 MAX14920ECB+T reliable?
The price and inventory of MAX14920ECB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX14920ECB+T is usually 5 days.
3.What payment methods are accepted for MAX14920ECB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX14920ECB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX14920ECB+T?
MAX14920ECB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX14920ECB+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 MAX14920ECB+T?
For technical support, including MAX14920ECB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX14920ECB+T requirements.
6.How does Aetrix verify that MAX14920ECB+T is sourced from the original manufacturer or authorized distributors?
All MAX14920ECB+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 MAX14920ECB+T meets industry standards.
7.What is the process for return or replacement of MAX14920ECB+T?
All MAX14920ECB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX14920ECB+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 MAX14920ECB+T part is unused and in its original packaging.
Return procedure for MAX14920ECB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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