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参数资料
| 型号： | BQ24003RGWTR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| 封装： | 5 X 5 MM, PLASTIC, QFN-20 |
| 文件页数： | 9/31页 |
| 文件大小： | 1000K |
| 代理商： | BQ24003RGWTR |
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bq24001
bq24002
bq24003
SLUS462E SEPTEMBER 2000 REVISED NOVEMBER 2004
www.ti.com
17
Table 2. bq24002 (2 Individual LEDs)
CHARGE STATE
STAT1 (RED)
STAT2
(GREEN)
Precharge
ON (LOW)
OFF
Fast charge
ON (LOW)
OFF
FAULT
Flashing (1 Hz,
50% duty cycle)
OFF
Done (>90%)
OFF
ON (LOW)
Sleep-mode
OFF
APG/Therm invalid
OFF
Thermal shutdown
OFF
Battery absent
OFF
OFF(1)
(1) If thermistor is used, then the Green LED is off.
Table 3. bq24003 (Single Bicolor LED)
CHARGE STATE
LED1 (RED)
LED2
(GREEN)
APPARENT
COLOR
Precharge
ON (LOW)
OFF (HIGH)
RED
Fast charge
ON (LOW)
OFF (HIGH)
RED
FAULT
ON (LOW)
YELLOW
Done (>90%)
OFF (HIGH)
ON (LOW)
GREEN
Sleep-mode
OFF (HIGH)
OFF
APG/Therm
invalid
OFF (HIGH)
OFF
Thermal
shutdown
OFF (HIGH)
OFF
Battery absent
OFF (HIGH)
OFF (HIGH)(1)
OFF(1)
(1) If thermistor is used, then the Green LED is off.
Thermal Shutdown
The bq2400x monitors the junction temperature TJ of the DIE and suspends charging if TJ exceeds 165°C. Charging
resumes when TJ 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
10k
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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