General Description

The MAX11080 is a battery-pack fault-monitor IC capa-

ble of monitoring up to 12 lithium-ion (Li+) battery

cells. This device is designed to provide an overvolt-

age or undervoltage fault indication when any of the

cells cross the user-selectable threshold for longer

than the set program-delay interval. The overvoltage

levels are pin selectable from +3.3V to +4.8V in 100mV

increments, and have a guaranteed accuracy of

±25mV over the entire temperature range. The under-

voltage level is also user selectable from +1.6V to

+2.8V in 200mV increments. These levels are guaran-

teed to ±100mV over the entire temperature range.

Undervoltage detection can be disabled as one of the

user-configuration options.

The MAX11080 has a built-in level-shifter that allows up

to 31 MAX11080 devices to be connected in a daisy-

chain fashion to reduce the number of interface signals

needed for large stacks of series batteries. Each cell is

monitored differentially and compared to the overvolt-

age and undervoltage thresholds. When any of the cells

exceed this threshold for longer than the set program

delay interval, the MAX11080 inhibits the heartbeat sig-

nal from being passed down the daisy chain. Built-in

comparator hysteresis prevents threshold chattering.

The MAX11080 is designed to be the perfect comple-

ment to the MAX11068 high-voltage measurement IC

for redundant fault-monitoring applications. This device

is offered in a 9.7mm x 4.4mm, 38-pin TSSOP package

with 0.5mm pin spacing. The package is lead-free and

RoHS compliant with an extended operating tempera-

ture range of -40°C to +105°C.

Applications

High-Voltage, Multicell-Series-Stacked Battery

Systems

Electric Vehicles

Hybrid Electric Vehicles

Electric Bikes

High-Power Battery Backup

Solar Cell Battery Backup

Super-Cap Battery Backup

Features

o Up to 12-Cell Li+ Battery Voltage Fault Detection

o Operation from 6.0V to 72V

o Pin-Selectable Overvoltage Threshold from +3.3V

to +4.8V in 100mV Increments

±25mV Overvoltage-Detection Accuracy

o Pin-Selectable Undervoltage Threshold from

+1.6V to +2.8V in 200mV Increments

±100mV Undervoltage-Detection Accuracy

o 300mV Over/Undervoltage-Threshold Detection

Hysteresis

o Programmable Delay Time of Alarm Detection

from 3.0ms to 3.32s with an External Capacitor

o Daisy-Chained Alarm and Shutdown Functions

with Heartbeat Status Signal

Up to 31 Devices Can Be Connected

o Ultra-Low-Power Dissipation

Operating-Mode Current Drain: 80µA

Shutdown-Mode Current: 2µA

o Wide Operating Temperature Range from -40°C to

+105°C (AEC-Q100 Type 2)

o 9.7mm x 4.4mm, 38-Pin TSSOP Package

o Lead(Pb) Free and RoHS Compliant

12-Channel, High-Voltage Battery-Pack

Fault Monitor

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Maxim Integrated Products

1

Ordering Information

19-4584; Rev 0; 5/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part.

PART

TEMP RANGE

PIN-PACKAGE

MAX11080GUU+

-40

°C to +105°C

38 TSSOP

MAX11080GUU/V+

-40

°C to +105°C

38 TSSOP

Pin Configuration appears at end of data sheet.