BQ24004_12 Datasheet, PDF (16/27 Pages) Texas Instruments – TWO-CELL Li-ION CHARGE MANAGEMENT IC

bq24004
bq24005
bq24006
SLUS476F – DECEMBER 2000 – REVISED MAY 2012
Table 1. bq24004 (Single LED) (continued)
CHARGE STATE
Done (>90%)
Sleep-mode
APG/Therm invalid
Thermal shutdown
Battery absent
STAT1
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
OFF (HIGH)
Table 2. bq24005 (2 Individual LEDs)
CHARGE STATE
Precharge
Fast charge
FAULT
Done (>90%)
Sleep-mode
APG/Therm invalid
Thermal shutdown
STAT1 (RED)
ON (LOW)
ON (LOW)
Flashing (1 Hz,50% duty
cycle)
OFF
OFF
OFF
OFF
STAT2
(GREEN)
OFF
OFF
OFF
ON (LOW)
OFF
OFF
OFF
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Table 2. bq24005 (2 Individual LEDs) (continued)
CHARGE STATE
STAT1 (RED)
Battery absent
OFF
(1)_{If thermistor is used, then the Green LED is off.}
STAT2
(GREEN)
OFF⁽¹⁾
Table 3. bq24006 (Single Bicolor LED)
CHARGE STATE LED1 (RED)
LED2
(GREEN)
Precharge
ON (LOW) OFF (HIGH)
Fast charge
ON (LOW) OFF (HIGH)
FAULT
ON (LOW) ON (LOW)
Done (>90%)
OFF (HIGH) ON (LOW)
Sleep-mode
OFF (HIGH) OFF (HIGH)
APG/Therminvalid OFF (HIGH) OFF (HIGH)
Thermal shutdown OFF (HIGH) OFF (HIGH)
Battery absent
OFF (HIGH) OFF (HIGH)⁽¹⁾
(1)_{If thermistor is used, then the Green LED is off.}
APPARENT
COLOR
RED
RED
YELLOW
GREEN
OFF
OFF
OFF
OFF⁽¹⁾
Thermal Shutdown
The bq2400x monitors the junction temperature T_J of the DIE and suspends charging if T_J exceeds 165°C.
Charging resumes when T_J falls below 155°C.
DETAILED DESCRIPTION
POWER FET
The integrated transistor is a P-channel MOSFET.
The power FET features a reverse-blocking Schottky
diode, which prevents current flow from OUT to IN.
An internal thermal-sense circuit shuts off the power
FET when the junction temperature rises to
approximately 165°C. Hysteresis is built into the
thermal sense circuit. After the device has cooled
approximately 10°C, the power FET turns back on.
The power FET continues to cycle off and on until the
fault is removed.
CURRENT SENSE
The bq2400x regulates current by sensing, on the
ISNS pin, the voltage drop developed across an
external sense resistor. The sense resistor must be
placed between the supply voltage (Vcc) and the
input of the IC (IN pins).
VOLTAGE SENSE
To achieve maximum voltage regulation accuracy,
the bq2400x uses the feedback on the VSENSE pin.
Externally, this pin should be connected as close to
the battery cell terminals as possible. For additional
safety, a 10-kΩ internal pullup resistor is connected
between the VSENSE and OUT pins.
ENABLE (EN)
The logic EN input is used to enable or disable the
IC. A high-level signal on this pin enables the
bq2400x. A low-level signal disables the IC and
places the device in a low-power standby mode.
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