MAX14920

PRODUCTION

MAX14920

High-Accuracy 12-/16-Cell Measurement AFEs

Industry's Most Accurate and Flexible Battery Management System Building Block

PRODUCTION

MAX14920, MAX14921: Functional Diagram slide

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1ku List Price Starting From $6.54

Features

High Accuracy
- ±0.5mV (max) Cell Voltage Error
- Simultaneous Cell Voltage Sampling
- Self-Calibration
Integrated Diagnostics
- Open-Wire and Short Fault Detection
- Undervoltage/Overvoltage Warning
- Thermal Shutdown
High Flexibility
- SPI Interface
- 12-Cell and 16-Cell Versions
- +6V Minimum (3 Cells) Operation
- +0.5V to +4.5V Cell Voltage Range
- Integrated Cell-Balancing FET Drivers
- Integrated 5V LDO
Low Power
- 1µA Shutdown Mode
- 1µA/10µA Cell Current Draw

Additional Details

The MAX14920/MAX14921 battery measurement analog front-end devices accurately sample cell voltages and provide level shifting for primary/secondary battery packs up to 16 cells/+65V (max). The MAX14920 monitors up to 12 cells, while the MAX14921 monitors up to 16 cells. Both devices simultaneously sample all cell voltages, allowing accurate state-of-charge and source-resistance determination. All cell voltages are level shifted to ground reference with unity gain, simplifying external ADC data conversion.

The devices have a low-noise, low-offset amplifier that buffers differential voltages of up to +5V, allowing monitoring of all common lithium-ion (Li+) cell technologies. The resulting cell voltage error is ±0.5mV.

The devices’ high accuracy make them ideal for monitoring cell chemistries with very flat discharge curves, such as lithium-metal phosphate.

Passive-cell balancing is supported by external FET drivers. Integrated diagnostics in the devices allow open-wire detection and undervoltage/overvoltage alarms. The devices are controlled by a daisy-chainable SPI interface.

The MAX14920 is available in a 64-pin (10mm x 10mm) TQFP package with an exposed pad. The MAX14921 is available in an 80-pin (12mm x 12mm) TQFP package. Both devices are specified over the -40°C to +85°C extended temperature range.

Applications

e-Transportation Energy Packs
Energy Storage Packs
Industrial Battery Backup Systems
Telecom Battery Backup Systems

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $6.54

Technical Documents 5

MAX14920-MAX14921: High-Accuracy 12-/16-Cell Measurement AFEs Data Sheet (Rev.3) 04/22/2015

MAX14920 Reliability Data 01/12/2023

PCB Layout Guidelines for the MAX14921 High-Accuracy 12-/16-Cell Measurement AFE 04/03/2013

Optimize Battery Measurement and Cell-Stack Monitoring with Highly Accurate AFE 03/30/2015

Getting the Most Out of the MAX14920/MAX14921 High-Accuracy Battery-Measurement AFEs 11/20/2013

Design Resources 2

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX14920ECB+	64-TQFP_EP-10X10X1.0	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
MAX14920ECB+T	64-TQFP_EP-10X10X1.0	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

MAX14920ECB+
Pin/Package Drawing
64-TQFP_EP-10X10X1.0
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

MAX14920ECB+T
Pin/Package Drawing
64-TQFP_EP-10X10X1.0
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Feb 26, 2016

- 1589A

ASSEMBLY

MAX14920ECB+

PRODUCTION

pdf

pcn_1589a

Oct 16, 2015

- 1483C_AMENDED

WAFER FAB

MAX14920ECB+

PRODUCTION

pdf

pcn_1483c_amended

Jun 9, 2014

- 1421

ELECTRICAL DATASHEET

MAX14920ECB+

PRODUCTION

pdf

pcn_1421

Filter by Model

Part Models

Product Lifecycle

PCN

Feb 26, 2016

- 1589A

ASSEMBLY

MAX14920ECB+

PRODUCTION

pdf

pcn_1589a

Oct 16, 2015

- 1483C_AMENDED

WAFER FAB

MAX14920ECB+

PRODUCTION

pdf

pcn_1483c_amended

Jun 9, 2014

- 1421

ELECTRICAL DATASHEET

MAX14920ECB+

PRODUCTION

pdf

pcn_1421

Companion Parts 2

Parts	Product Life Cycle	Description
Series Voltage References1
MAX6126	PRODUCTION	Ultra-High-Precision, Ultra-Low-Noise, Series Voltage Reference
Single Channel A/D Converters1
MAX11163	PRODUCTION	16-Bit, 250ksps, +5V Unipolar Input, SAR ADC, in Tiny 10-Pin µMAX

MAX14921EVKIT

Evaluation Kit for the MAX14921

MAX14921EVKIT

Evaluation Kit for the MAX14921

Features and Benefits

16-Cell/65V (max) Stack Operating Voltage Range
Built-In Isolated USB Interface to a Windows-Based PC
Plugh-and-Play GUI Demonstrates All the Major Features of the MAX14921
Screw Terminal Battery Connector
Proven PCB Layout
Fully Assembled and Tested

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Product Detail

The MAX14921 evaluation kit (EV kit) demonstrates a high-accuracy 16-cell battery-management reference design. The MAX14921 is a high-accuracy 16-cell measurement analog front-end (AFE) in an 80-pin TQFP surface-mount package. The EV kit features an ADC and reference, and an isolated interface to a PC through a USB port to easily measure all cell voltages. Cell stacks up to 16 cells or 65V can be monitored, whichever is lower.

The EV kit circuit demonstrates all the features of the device through a GUI application on a Windows^®-based PC.

Applications