MAX11080 데이터 시트보기 (PDF) - Maxim Integrated
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MAX11080 Datasheet PDF : 29 Pages
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12-Channel, High-Voltage
Battery-Pack Fault Monitors
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
selection is sensed and stored at power-up and any
subsequent change to the input pin status is ignored.
Internal Linear Regulator
The MAX11080/MAX11081 have an internal linear regula-
tor for generating 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 out-
put 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/MAX11081 in a
reset state until the internal supply has reached a sustain-
able threshold of +3.0V (±5%). The internal comparators
have built-in hysteresis that can reject noise on the supply
line. Because secondary metal batteries are never fully
discharged to 0V, the MAX11080/MAX11081 are
designed for a hot-swap insertion of the battery cells.
Once the POR threshold is reached, approximately 1ms
later the internal reset signal disables, the internal oscilla-
tor starts, and the charge pump begins operating. The
charge pump reaches regulation in approximately 3ms.
The MAX11080/MAX11081 associated with the top mod-
ule in the battery pack are identified as detailed in the
TOPSEL Function section. This is followed by a self-test of
the overvoltage comparators and detection of the number
of cells connected. At this time in the power-on
sequence, the MAX11080/MAX11081 are ready for oper-
ation. When the charge pump achieves regulation of 3.3V
between VDDU and GNDU, it switches to a standby mode
until the voltage drops by about 35mV. The specified
accuracy and full operation of the MAX11080/MAX11081
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
2.6V
CP POR
COMPARATOR
AGND
35mV
HYSTERESIS
+3.3V TO
GNDU
CP_POR/
POR THRESHOLD +3.0V ±5%
Figure 11. Internal Linear Regulator Block Diagram
POR
COMPARATOR
VAA POR/
INTERNAL
POR/
16 ______________________________________________________________________________________
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