BQ24300 Datasheet, PDF (1/22 Pages) Texas Instruments – OVERVOLTAGE AND OVERCURRENT PROTECTION IC AND Li+ CHARGER FRONT-END PROTECTION IC

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bq24300
bq24304
SLUS764A – AUGUST 2007 – REVISED OCTOBER 2007
OVERVOLTAGE AND OVERCURRENT PROTECTION IC AND
Li+ CHARGER FRONT-END PROTECTION IC
FEATURES
1
•2 Provides Protection for Three Variables:
– Input Overvoltage
– Input Overcurrent with Current Limiting
– Battery Overvoltage
• 30V Maximum Input Voltage
• Optional Input Reverse Polarity Protection
• High Immunity Against False Triggering Due to
Voltage Spikes
• Robust Against False Triggering Due to
Current Transients
• Thermal Shutdown
• Enable Function
• Small 2 mm × 2 mm 8-Pin SON Package
• LDO Mode Voltage Regulation Options:
– 5.5V on bq24300
– 4.5V on bq24304
APPLICATIONS
• Bluetooth Headsets
• Low-Power Handheld Devices
DESCRIPTION
The bq24300 and bq24304 are highly integrated circuits designed to provide protection to Li-ion batteries from
failures of the charging circuit. The IC continuously monitors the input voltage, the input current, and the battery
voltage. The device operates like a linear regulator: for voltages up to the Input Overvoltage threshold, the output
is held at 5.5V (bq24300) or 4.5V (bq24304). In case of an input overvoltage condition, if the overvoltage
condition persists for more than a few microseconds, the IC removes power from the charging circuit by turning
off an internal switch. In the case of an overcurrent condition, it limits the current to a safe value for a blanking
duration before turning the switch off. Additionally, the IC also monitors its own die temperature and switches off
if it becomes too hot.
The IC also offers optional protection against reverse voltage at the input with an external P-channel MOSFET.
IN 1
VSS 2
PGATE ₃
PINOUT
bq24300
bq24304
8 OUT
7 NC
6 VBAT
AC Adapter
VDC
GND
APPLICATION SCHEMATIC
1 μF
1 IN
OUT ₈
bq24300
1 μF ^bq24080
Charger IC
VBAT ₆
100 kW
SYSTEM
NC 4
5 ^CE
2
5
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated