Overview
The BQ24075RGTR from Texas Instruments is a standalone 1-cell, 1.5-A linear battery charger with integrated power path management. This device is designed for space-limited portable applications and operates from either a USB port or an AC adapter. It supports charge currents up to 1.5 A and features a dynamic power path management (DPPM) function that simultaneously and independently powers the system and charges the battery. The BQ24075RGTR is fully compliant with USB charger standards and includes various protection mechanisms such as overvoltage, reverse current, short-circuit, and thermal protection.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | VQFN (RGT) | - |
| Pins | 16 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Input Voltage Rating | 28 V | V |
| Maximum Input Current | 1.5 A | A |
| Maximum Charge Current | 1.5 A | A |
| Output Voltage Regulation | 5.5 V | V |
| Junction Temperature | -40 to 125 | °C |
| Thermal Resistance (Junction-to-Ambient) | 44.5 | °C/W |
Key Features
- Fully compliant USB charger with selectable 100-mA and 500-mA maximum input current.
- Integrated dynamic power path management (DPPM) function that simultaneously and independently powers the system and charges the battery.
- Supports up to 1.5-A charge current with current monitoring output (ISET).
- Programmable input current limit up to 1.5 A for wall adapters.
- Battery disconnect function with SYSOFF input.
- Programmable pre-charge and fast-charge safety timers.
- Reverse current, short-circuit, and thermal protection.
- NTC thermistor input and proprietary start-up sequence to limit inrush current.
- Status indication – charging/done, power good.
Applications
The BQ24075RGTR is targeted at space-limited portable applications, such as handheld devices, smartphones, tablets, and other battery-powered consumer electronics. It is particularly useful in devices that require efficient battery charging and system power management, ensuring that the system can operate even with a defective or absent battery pack.
Q & A
- What is the maximum charge current supported by the BQ24075RGTR?
The BQ24075RGTR supports up to 1.5 A of charge current.
- Is the BQ24075RGTR compliant with USB charger standards?
Yes, the BQ24075RGTR is fully compliant with USB charger standards, including selectable 100-mA and 500-mA maximum input current.
- What is the operating temperature range of the BQ24075RGTR?
The operating temperature range is -40°C to 85°C.
- Does the BQ24075RGTR have overvoltage protection?
Yes, it has a 28-V input rating with overvoltage protection.
- How does the dynamic power path management (DPPM) function work?
The DPPM function simultaneously and independently powers the system and charges the battery, ensuring the system load is always supplied while monitoring the charge current separately.
- What safety features are included in the BQ24075RGTR?
The device includes reverse current, short-circuit, and thermal protection, as well as an NTC thermistor input and a proprietary start-up sequence to limit inrush current.
- Can the input current limit be programmed?
Yes, the input current limit can be programmed up to 1.5 A using external resistors.
- How does the battery disconnect function work?
The battery disconnect function is controlled by the SYSOFF input, which can turn off the FET connecting the battery to the system output.
- What is the purpose of the status indication outputs?
The status indication outputs (PGOOD, CHG) provide signals for charging/done and power good status.
- Is the BQ24075RGTR suitable for use in safety-critical applications?
The BQ24075RGTR is functional safety-capable, with documentation available to aid in functional safety system design.
