MAX11080GUU 데이터 시트보기 (PDF) - Maxim Integrated

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MAX11080GUU

12-Channel, High-Voltage Battery-Pack Fault Monitors

Maxim Integrated 

12-Channel, High-Voltage

Battery-Pack Fault Monitors

HV

6V

DCIN

C12

C1 TO C11

6V

80V 80V

80V

VDDU

CP+

ALRMU

GNDU

CP-

ESD DIODES

MAX11080

MAX11081

C0

AGND

4V

4V

6V

VAA

ALRML

SHDN

CD

TOPSEL

OVSEL0/1/2/3

UVSEL0/1/2

Figure 6. ESD Diode Diagram

Detailed Description

Figure 1 shows the functional diagram; Figure 2 shows

the application circuit diagram for a 12-cell system

while Figure 3 shows the application circuit design for a

10-cell system and Figure 4 for an 8-cell system. Figure

5 is the application schematic for the battery module

system with redundant fault detection and Figure 6 is

the ESD diode diagram.

Architectural Overview

The MAX11080/MAX11081 are battery-pack fault-monitor

ICs capable of monitoring up to 12 Li+ battery cells.

These devices are designed to provide an overvoltage or

undervoltage alarm indicator when any of the cells cross

the user-selectable threshold for longer than the config-

ured decision delay interval. The MAX11080/MAX11081

also incorporates daisy-chain bus for use in high-voltage

stacked-battery operation. The daisy-chain bus relays

shutdown and alarm communication across up to 31

stacked modules without the need for isolation between

each module. This results in a simplified system with

reduced cost. The MAX11080/MAX11081 are ideal as an

ultra-low-power, redundant cell-fault monitor that is the

perfect complement to the MAX11068 high-voltage bat-

tery measurement IC. Both ICs in concert form a powerful

Li+ battery system monitor with redundant overvoltage

and undervoltage fault detection.

Overvoltage and Undervoltage

Fault Detection

Figure 7 summarizes the fault-detection mechanism for

a set of differential cell inputs in the MAX11080/

MAX11081.

First, the differential cell inputs are attenuated by a fac-

tor of four while being level shifted and converted to a

single-ended voltage referenced to AGND. The ground-

referenced voltage is then connected to a set of over-

12 ______________________________________________________________________________________

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