MAX11080 Datasheet, PDF (17/27 Pages) Maxim Integrated Products – 12-Channel, High-Voltage Battery-Pack Fault Monitor

12-Channel, High-Voltage Battery-Pack
Fault Monitor
pump reaches regulation in approximately 3ms. The
MAX11080 associated with the top module in the bat-
tery pack is 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 is ready for operation. When
the charge pump achieves regulation of 3.3V between
VDD_U and GND_U, it switches to a standby mode until
the voltage drops by about 35mV. The specified accu-
racy and full operation of the MAX11080 are not guar-
anteed until a minimum of 6.0V is applied to the DCIN
pin.
The linear regulator also incorporates a thermal shut-
down feature. If the MAX11080 die temperature rises
above +145°C, the device shuts down. After a thermal
shutdown, the die temperature must cool 15°C below
the shutdown temperature before the device restarts.
Figure 12 shows the linear regulator power-up sequence
and Figure 13 shows the low DCIN POR event.
POR ACTIVE
VOLTAGE APPLIED
TO DCIN
SHDN ACTIVE
FAULT THRESHOLDS
READ
16kHz OSCILLATOR
ENABLED
CHECK SHDN
CHARGE-PUMP
ENABLED
REGULATOR
ENABLED
V_AA < 3.0V
3ms DELAY
TOP BOARD
IDENTIFIED
CHECK V_AA
OVERVOLTAGE
COMPARATOR
SELF-TEST
1ms DELAY
POR CLEARED
NUMBER OF CELLS
DETECTED
MAX11080 FULLY
FUNCTIONAL
Figure 12. Linear Regulator Power-Up Sequence
POR INACTIVE
FALLING DCIN
VOLTAGE
V_AA > 2.8V
CHECK V_AA
POR ACTIVE
OSCILLATOR,
CHARGE PUMP,
DIGITAL LOGIC,
AND ALARM PULSE
DISABLED
Figure 13. Low DCIN POR Event
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