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BQ24008 Datasheet

  • BQ24008

  • 用于 PDA/因特网设备的单节锂离子充电器，具有集成 FET 和双色 L...

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bq24007
bq24008
SLUS479D 鈭?JANUARY 2001 鈭?REVISED NOVEMBER 2004
Charge current feedback, applied through pin ISNS,
maintains regulation around a threshold of Vilim. The
following formula calculates the value of the sense
resistor:
R
(SNS)
+
V
(ilim)
I
(REG)
Minimum Current: The bq2400x monitors the charging
current during the voltage regulation phase. The bq2400x
initiates a 22-minute timer once the current falls below the
taperdet trip threshold. Fast charge is terminated once the
22-minute timer expires.
Charge Status Display
The two available options allow the user to configure the
charge status display for single LED (bq24007) or a bicolor
LED (bq24008). The output stage is totem pole for the
bq24007 and bq24008. The following tables summarize
the operation of the three options:
where I
REG
is the desired charging current.
Voltage Monitoring and Regulation
Voltage regulation feedback is through pin VSENSE. This
input is tied directly to the positive side of the battery pack.
The bq2400x supports cells with either coke (4.1 V) or
graphite (4.2 V) anode. Pin VSEL selects the charge
regulation voltage.
VSEL State
(see Note)
Low
High
NOTE: VSEL should not be left floating.
CHARGE REGULATION
VOLTAGE
4.1 V
4.2 V
Table 1. bq24007 (Single LED)
CHARGE STATE
Precharge
Fast charge
FAULT
Done (>90%)
Sleep-mode
APG/Therm invalid
Thermal shutdown
Battery absent
STAT1
ON (LOW)
ON (LOW)
Flashing (1 Hz, 50% duty cycle)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
Charge Termination
The bq2400x continues with the charge cycle until
termination by one of the two possible termination
conditions:
Maximum Charge Time: The bq2400x sets the maximum
charge time through pin TMRSEL. The TMR SEL pin
allows the user to select between three different total
charge-time timers (3, 4, 5, or 6 hours). The charge timer
is initiated after the preconditioning phase of the charge
and is reset at the beginning of a new charge cycle. Note
that in the case of a fault condition, such as an out-of-range
signal on the APG/THERM input or a thermal shutdown,
the bq2400x suspends the timer. Charge timers are active
only when TMR EN input is low.
TMRSEL STATE
Floating(1)
Low
High
CHARGE TIME
3 hours
6 hours
4.5 hours
Table 2. bq24008 (Single Bicolor LED)
CHARGE STATE
Precharge
Fast charge
FAULT
Done (>90%)
Sleep-mode
APG/Therm
invalid
Thermal
shutdown
Battery absent
LED1 (RED)
ON (LOW)
ON (LOW)
ON (LOW)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
LED2
(GREEN)
OFF (HIGH)
OFF (HIGH)
ON (LOW)
ON (LOW)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)(1)
APPARENT
COLOR
RED
RED
YELLOW
GREEN
OFF
OFF
OFF
OFF(1)
(1) If thermistor is used, then the green LED is off.
Thermal Shutdown
The bq2400x monitors the junction temperature T
J
of the
DIE and suspends charging if T
J
exceeds 165掳C.
Charging resumes when T
J
falls below 155掳C.
(1) To improve noise immunity, it is recommended that a minimum of
10 pF capacitor be tied to Vss on a floating pin.
17

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