Overview
The BQ25703A, produced by Texas Instruments, is a highly versatile and efficient I2C multi-chemistry battery buck-boost charge controller. This device is designed to charge 1- to 4-cell batteries from a wide range of input sources, including USB adapters, high-voltage USB PD sources, and traditional adapters. It offers a seamless transition between buck and boost operation, making it ideal for space-constrained, multi-chemistry battery charging applications. The BQ25703A also features a system power monitor and processor hot monitor, enhancing its suitability for various portable and industrial devices.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Operating Range | 3.5 | - | 24 | V |
| Output Voltage Range (USB OTG) | 4.48 | - | 20.8 | V |
| Output Current Limit | - | - | 6.35 | A |
| Switching Frequency | 800 kHz | - | 1.2 MHz | - |
| Junction Temperature | -40 | - | 125 | °C |
| Operating Free-Air Temperature | -40 | - | 85 | °C |
| Package Type | - | - | 32-Pin WQFN (4x4 mm) | - |
Key Features
- Charges 1- to 4-cell batteries from a wide range of input sources (3.5V to 24V).
- Supports USB2.0, USB 3.0, USB 3.1 (Type C), and USB PD input current settings.
- Seamless transition between buck and boost operation.
- Input current and voltage regulation (IDPM and VDPM) against source overload.
- Power/current monitor for CPU throttling with comprehensive PROCHOT profile, IMVP8 compliant.
- Narrow-VDC (NVDC) power path management with instant-on capability even without a battery or with a deeply discharged battery.
- Battery supplements system when adapter is fully loaded.
- Power up USB port from battery (USB OTG) with output voltage range of 4.48V to 20.8V compatible with USB PD.
- Programmable switching frequency (800 kHz or 1.2 MHz) for 1-µH to 3.3-µH inductor.
- Host control interface via I2C port for flexible system configuration and status reporting.
- Hardware pin to set input current limit without EC control.
- Integrated ADC to monitor voltage, current, and power with high accuracy regulation and monitoring.
- Safety features include thermal shutdown, input, system, battery overvoltage protection, and MOSFET inductor overcurrent protection.
Applications
- Drones
- Bluetooth speakers
- IP cameras
- Detachable tablet PCs and power banks
- Industrial and medical equipment
- Portable equipment with rechargeable batteries
Q & A
- What is the input voltage range of the BQ25703A?
The input voltage range is from 3.5V to 24V.
- What types of USB standards does the BQ25703A support?
The BQ25703A supports USB2.0, USB 3.0, USB 3.1 (Type C), and USB PD.
- What is the output voltage range in USB OTG mode?
The output voltage range in USB OTG mode is from 4.48V to 20.8V.
- What is the maximum output current limit of the BQ25703A?
The maximum output current limit is up to 6.35 A.
- What are the programmable switching frequencies of the BQ25703A?
The programmable switching frequencies are 800 kHz or 1.2 MHz.
- What is the package type of the BQ25703A?
The package type is a 32-Pin WQFN (4x4 mm).
- Does the BQ25703A support multiple battery chemistries?
Yes, it supports Li+, LiFePO4, NiCd, NiMH, and Lead Acid battery chemistries.
- What safety features does the BQ25703A include?
The BQ25703A includes thermal shutdown, input, system, battery overvoltage protection, and MOSFET inductor overcurrent protection.
- How does the BQ25703A manage power when the adapter is fully loaded?
The battery supplements the system when the adapter is fully loaded.
- What communication interface does the BQ25703A use for host control?
The BQ25703A uses an I2C port for host control and status reporting.
