Overview
The BQ24308DSGR from Texas Instruments is a highly integrated overvoltage and overcurrent protection IC designed to safeguard Li-ion batteries from various charging circuit failures. This device continuously monitors the input voltage, input current, and battery voltage to ensure safe operating conditions. It features automatic shutdown in case of input overvoltage, overcurrent, or battery overvoltage conditions, thereby protecting downstream devices from hazardous voltages.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 3.3 to 26 | V |
| Input Current, IN Pin | 1.5 | A |
| Output Current, OUT Pin | 1.5 | A |
| Maximum Input Voltage | 30 | V |
| Junction Temperature Range | -40 to 125 | °C |
| Thermal Shutdown Temperature | 140 to 150 | °C |
| Package Type | 8-Pin WSON with Exposed Thermal Pad | |
| Package Size | 2 mm × 2 mm |
Key Features
- Provides protection against input overvoltage, overcurrent, and battery overvoltage.
- Continuous monitoring of input voltage, input current, and battery voltage.
- Automatic shutdown of internal switch in case of fault conditions.
- User-programmable input overcurrent threshold using an external resistor.
- Optional protection against reverse voltage at the input using an external P-channel FET.
- Thermal shutdown to prevent overheating.
- LDO mode voltage regulation of 5 V.
- Robust against false triggering due to current transients.
- Soft-start feature to minimize inrush current and voltage ringing.
Applications
- Mobile and smart phones.
- PDAs.
- MP3 players.
- Low-power handheld devices.
- Bluetooth™ headsets.
Q & A
- What is the primary function of the BQ24308DSGR?
The primary function of the BQ24308DSGR is to provide protection to Li-ion batteries from input overvoltage, overcurrent, and battery overvoltage failures.
- What is the maximum input voltage the BQ24308DSGR can handle?
The BQ24308DSGR can handle a maximum input voltage of 30 V.
- How does the BQ24308DSGR protect against overcurrent conditions?
The device limits the system current to a safe value for a blanking duration before turning the internal switch off in case of an overcurrent condition.
- Can the input overcurrent threshold be adjusted?
- What is the thermal shutdown temperature of the BQ24308DSGR?
The thermal shutdown temperature range is between 140°C and 150°C.
- What type of package does the BQ24308DSGR come in?
The BQ24308DSGR comes in an 8-Pin WSON package with an exposed thermal pad, measuring 2 mm × 2 mm.
- How does the BQ24308DSGR protect against reverse voltage?
The device offers optional protection against reverse voltage at the input using an external P-channel FET.
- What is the purpose of the PGATE pin in the BQ24308DSGR?
The PGATE pin is used to drive an external P-FET for reverse polarity protection.
- Does the BQ24308DSGR have a soft-start feature?
- In which applications is the BQ24308DSGR commonly used?
The BQ24308DSGR is commonly used in mobile and smart phones, PDAs, MP3 players, low-power handheld devices, and Bluetooth™ headsets.
