MAX11080(2009) View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX11080
(Rev.:2009)

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

Maxim Integrated 

12-Channel, High-Voltage Battery-Pack

Fault Monitor

Table 2. Undervoltage Threshold Selection

THRESHOLD (V)

Disabled

1.6

1.8

2.0

2.2

2.4

2.6

2.8

UVSEL2

0

0

0

0

1

1

1

1

UNDERVOLTAGE SELECTION

UVSEL1

0

0

1

1

0

0

1

1

UVSEL0

0

1

0

1

0

1

0

1

Internal Linear Regulator

The MAX11080 has an internal linear regulator for gen-

erating the internal supply from DCIN (Figure 11). The

regulator can accept a supply voltage on the DCIN pin

from +6.0V to +72V, which it regulates to 3.3V to run

the voltage-detection system, control logic, and low-

side alarm-pulse interface. When the SHDN pin is not

active and a sufficient voltage is applied to DCIN, the

output of the regulator becomes active. The regulator is

paired with a power-on-reset (POR) circuit that senses

its output voltage and holds the MAX11080 in a reset

state until the internal supply has reached a sustainable

threshold of +3.0V (±5%). The internal comparators

have built-in hysteresis that can reject noise on the sup-

ply line. Because secondary metal batteries are never

fully discharged to 0V, the MAX11080 is designed for a

hot-swap insertion of the battery cells. Once the POR

threshold is reached, approximately 1ms later the inter-

nal reset signal disables, the internal oscillator starts,

and the charge pump begins operating. The charge

DCIN

SHDN

+6.0V TO +72V

LINEAR

REGULATOR

REGULATOR

ENABLE

DIE OVERTEMPERATURE

DETECT

BANDGAP

REFERENCE

INTERNAL +3.3V

CHARGE

PUMP

CHARGE-PUMP

ENABLE

VAA

GNDU

VDDU

POR THRESHOLD +3.0V ±5%

Figure 11. Internal Linear Regulator Block Diagram

POR

COMPARATOR

35mV

HYSTERESIS

+3.3V TO GNDU

INTERNAL POR

16 ______________________________________________________________________________________

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