MAX1666S Datasheet, PDF (9/16 Pages) Maxim Integrated Products – Advanced Lithium-Ion Battery-Pack Protector

Advanced Lithium-Ion
Battery-Pack Protector
BATTERY
YES
CONNECTED
V_SRC < V_{B4P + 1V}
SHUTDOWN
V_SRC > V_{B4P + 1V}
NO
V_CC > 2.85V
YES
(DISCHARGE CURRENT · R_CS)
300mV
(>2.4ms)
CHARGE
CURRENT
MONITOR
(CHARGE CURRENT · R_CS)
200mV
(>2.4ms)
OVER-
DISCHARGE
DSO = H
RESET RESET ^OVERCHARGE
DS0 = L CGO = L ^{CGO = H}
STANDBY
80ms
SAMPLE
2.5ms
CHECK V_REF
550ms DELAY
V_CELL <
UNDERVOLTAGE
THRESHOLD
YES
NO
LATCH UVF = ‘1’
CELL MISMATCH
YES
NO
LATCH MMF = ‘1’
NO
NO
V_REF > 1.1V
YES
V_CELL <
UNDERVOLTAGE
WARNING
THRESHOLD
YES
LATCH UVW = ‘1’
V_CELL >
OVERVOLTAGE
THRESHOLD
YES
NO
LATCH OVF = ‘1’
UVF = ‘1’
AND
YES
V_SRC < V_B4P + 1V
NO
GO TO
TABLE 3
Figure 2. Cell Fault Monitor
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