Datasheet

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