Overview
The BQ24078RGTR is a highly advanced standalone 1-cell 1.5-A linear battery charger with integrated power path management, designed and manufactured by Texas Instruments. This device is specifically targeted at space-constrained portable applications, such as those using single-cell Li-Ion or Li-Polymer batteries. It operates from either a USB port or an AC adapter and supports charge currents up to 1.5 A. The BQ24078RGTR features a robust set of protections and management functions, including input overvoltage protection, dynamic power management, and thermal shutdown, ensuring reliable and efficient battery charging and system power management.
Key Specifications
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Number of series cells | 1 | Charge current (max) (A) | 1.5 |
| Vin (max) (V) | 6.4 | Cell chemistry | Li-Ion/Li-Polymer |
| Battery charge voltage (min) (V) | 4.35 | Battery charge voltage (max) (V) | 4.35 |
| Absolute max Vin (max) (V) | 28 | Control topology | Linear |
| Control interface | Standalone (RC-Settable) | Vin (min) (V) | 4.35 |
| Operating temperature range (°C) | -40 to 85 | Package | VQFN-16-EP(3x3) |
Key Features
- Fully compliant with USB charger standards, including 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.
- Programmable input current limit up to 1.5 A for wall adapters.
- System output tracks battery voltage, ensuring seamless power transition.
- Battery disconnect function with SYSOFF input.
- Programmable pre-charge and fast-charge safety timers.
- Reverse current, short-circuit, and thermal protection.
- NTC thermistor input for temperature monitoring.
- Proprietary start-up sequence to limit inrush current.
- Fault-tolerant design with advanced thermal shutdown.
- Battery charge monitoring and system power optimization.
Applications
The BQ24078RGTR is designed for use in space-constrained portable applications, including but not limited to:
- Single-cell Li-Ion or Li-Polymer battery-powered devices.
- Handheld electronics such as smartphones, tablets, and e-readers.
- Wearable devices like smartwatches and fitness trackers.
- Portable audio and video players.
- Other compact, high-current battery-powered devices.
Q & A
- What is the maximum charge current supported by the BQ24078RGTR?
The BQ24078RGTR supports up to 1.5 A of charge current.
- What types of batteries does the BQ24078RGTR support?
The device supports Li-Ion and Li-Polymer batteries.
- What is the input voltage range for the BQ24078RGTR?
The input voltage range is from 4.35 V to 6.4 V, with an absolute maximum of 28 V.
- Does the BQ24078RGTR have overvoltage protection?
Yes, it includes input overvoltage protection to safeguard against unregulated adapters.
- What is the operating temperature range of the BQ24078RGTR?
The operating temperature range is from -40°C to 85°C.
- What package type is the BQ24078RGTR available in?
The device is available in a 16-pin VQFN (RGT) package.
- Does the BQ24078RGTR support dynamic power path management?
Yes, it includes integrated dynamic power path management (DPPM) functionality.
- What safety features does the BQ24078RGTR include?
The device includes reverse current, short-circuit, and thermal protection, as well as programmable pre-charge and fast-charge safety timers.
- Is the BQ24078RGTR compliant with USB standards?
Yes, it is fully compliant with USB charger standards, including USB-IF inrush current specifications.
- What is the purpose of the NTC thermistor input on the BQ24078RGTR?
The NTC thermistor input is used for temperature monitoring of the battery.
