MAX14920 Datasheet, PDF (1/29 Pages) Maxim Integrated Products – High-Accuracy 12-/16-Cell Measurement AFEs

EVALUATION KIT AVAILABLE
MAX14920 / MAX14921
High-Accuracy 12-/16-Cell Measurement AFEs
General Description
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 moni-
toring of all common lithium-ion (Li+) cell technologies.
The resulting cell voltage error is Q0.5mV.
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
Industrial Battery Backup Systems
Telecom Battery Backup Systems
Energy Storage Packs
e-Transportation Energy Packs
Benefits and Features
S High Accuracy
 ±0.5mV (max) Cell Voltage
 Simultaneous Cell Voltage Sampling
 Self-Calibration
S Integrated Diagnostics
 Open-Wire and Short Fault Detection
 Undervoltage/Overvoltage Warning
 Thermal Shutdown
S 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
S Low Power
 1µA Shutdown Mode
 1µA/10µA Cell Current Draw
Ordering Information appears at end of data sheet.
Functional Diagram appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maximintegrated.com/MAX14920.related.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6496; Rev 0; 10/12