Overview
The BQ24073RGTR 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 dynamic power path management (DPPM) that simultaneously and independently powers the system and charges the battery. The BQ24073RGTR ensures compliance with USB-IF standards and includes various protection mechanisms such as overvoltage, reverse current, short-circuit, and thermal protection.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Package | VQFN (RGT) 16 pins | Package type and pin count |
| Operating Temperature Range | -40°C to 85°C | Operating temperature range |
| Input Voltage Rating | 28 V | Maximum input voltage rating with overvoltage protection |
| Charge Current | Up to 1.5 A | Maximum charge current with current monitoring output (ISET) |
| Input Current Limit | Programmable up to 1.5 A | Programmable input current limit for wall adapters |
| Battery Voltage Regulation | 4.2 V, 4.4 V | Regulated battery voltage and system output voltage |
| Junction Temperature | -40°C to 125°C | Operating junction temperature range |
Key Features
- Fully compliant USB charger with selectable 100-mA and 500-mA maximum input current
- Input-based dynamic power management (VIN-DPM) for protection against poor USB sources
- Integrated dynamic power path management (DPPM) function to simultaneously power the system and charge the battery
- Programmable input current limit up to 1.5 A for wall adapters
- Reverse current, short-circuit, and thermal protection
- NTC thermistor input for temperature monitoring
- Proprietary start-up sequence to limit inrush current
- Status indication – charging/done, power good
- Programmable pre-charge and fast-charge safety timers
- Battery charging in three phases: conditioning, constant current, and constant voltage
Applications
The BQ24073RGTR is suitable for various portable applications, including:
- Smartphones and tablets
- Handheld gaming devices
- Portable media players
- Wearable devices such as smartwatches and fitness trackers
- Other battery-powered portable electronics
Q & A
- What is the maximum charge current supported by the BQ24073RGTR?
The BQ24073RGTR supports up to 1.5 A charge current with current monitoring output (ISET).
- What is the input voltage rating of the BQ24073RGTR?
The input voltage rating is 28 V with overvoltage protection.
- Does the BQ24073RGTR support USB-IF compliance?
Yes, it is fully compliant with USB-IF standards, including a 100-mA maximum current limit.
- What protection mechanisms are included in the BQ24073RGTR?
The device includes reverse current, short-circuit, and thermal protection, as well as 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.
- Can the input current limit be programmed?
Yes, the input current limit can be programmed up to 1.5 A for wall adapters using external resistors.
- What is the operating temperature range of the BQ24073RGTR?
The operating temperature range is -40°C to 85°C.
- How does the battery charging process work?
The battery is charged in three phases: conditioning, constant current, and constant voltage, with an internal control loop monitoring the IC junction temperature and adjusting the charge current if necessary.
- What is the purpose of the NTC thermistor input?
The NTC thermistor input is used for temperature monitoring to ensure safe charging conditions.
- Does the BQ24073RGTR provide status indications?
Yes, it provides status indications for charging/done and power good.
