Overview
The Texas Instruments BQ24735RGRR is a high-efficiency, synchronous battery charger integrated circuit (IC) designed for use in portable devices. It supports 1-4 series Li+ cells and is particularly suited for applications requiring precise battery charging control and power management. The device is capable of supporting Intel® CPU Turbo Boost mode by allowing battery discharge energy to supplement the system power when the adapter's maximum power level is exceeded. It features a compact and efficient design, making it ideal for space-constrained, multichemistry battery charging applications.
Key Specifications
| Parameter | Value |
|---|---|
| Number of series cells | 1, 2, 3, 4 |
| Vin (min) (V) | 4.5 |
| Vin (max) (V) | 24 |
| Absolute max Vin (max) (V) | 30 |
| Battery charge voltage (min) (V) | 1.024 |
| Battery charge voltage (max) (V) | 19.2 |
| Charge current (max) (A) | 8.128 |
| Input current accuracy | ±3% up to 8.064 A |
| Charge current accuracy | ±3% up to 8.128 A |
| Charge voltage accuracy | ±0.5% up to 19.2 V |
| Switching frequencies | 615 kHz, 750 kHz, 885 kHz |
| Control topology | Switch-Mode Buck |
| Control interface | SMBus |
| Operating temperature range (°C) | -40 to 85 |
| Package | VQFN-20 |
Key Features
- SMBus host-controlled NMOS-NMOS synchronous buck converter with programmable switching frequencies (615 kHz, 750 kHz, 885 kHz).
- Automatic N-channel MOSFET selection of system power source from adapter or battery driven by internal charge pumps.
- Enhanced safety features including overvoltage protection, overcurrent protection, battery, inductor, and MOSFET short-circuit protection.
- Programmable input current, charge voltage, and charge current limits.
- High-regulation accuracies with ±0.5% charge voltage accuracy up to 19.2 V and ±3% charge current accuracy up to 8.128 A.
- Programmable battery depletion threshold and battery LEARN function.
- Integrated loop compensation and soft start.
- Real-time system control on ILIM pin to limit charge current.
- AC adapter operating range: 4.5 V to 24 V.
- Low off-state battery discharge current (5 µA) and low adapter standby quiescent current (0.65 mA).
Applications
- Laptop and notebook computers: Used for efficient and safe battery charging and power delivery.
- Tablets and mobile devices: Supports multi-chemistry batteries and provides energy-efficient charging mechanisms.
- Portable medical devices: Ensures reliable and safe battery management for medical equipment.
- Industrial and handheld instruments: Suitable for devices like barcode scanners and other portable testing tools.
- USB power delivery (PD) applications: Manages both input and output power for efficient charging and discharging of batteries.
Q & A
- What is the BQ24735RGRR used for?
The BQ24735RGRR is a synchronous battery charger IC used in portable devices for efficient power management and charging control, particularly supporting Intel® CPU Turbo Boost mode. - What types of batteries does the BQ24735RGRR support?
The BQ24735RGRR supports 1-4 series Li+ cells, including Li-ion and Li-polymer batteries. - What are the key safety features of the BQ24735RGRR?
The device includes overvoltage protection, overcurrent protection, battery, inductor, and MOSFET short-circuit protection. - What is the switching frequency range of the BQ24735RGRR?
The switching frequencies are programmable at 615 kHz, 750 kHz, and 885 kHz. - What is the operating temperature range of the BQ24735RGRR?
The operating temperature range is -40°C to 85°C. - What is the maximum charge current of the BQ24735RGRR?
The maximum charge current is up to 8.128 A. - How does the BQ24735RGRR manage system power sources?
The device uses internal charge pumps to drive N-channel MOSFETs for automatic system power source selection from the adapter or battery. - What interface does the BQ24735RGRR use for control?
The device uses an SMBus interface for control. - What is the package type of the BQ24735RGRR?
The device is packaged in a 20-pin VQFN (RGR) package. - What are some common applications of the BQ24735RGRR?
Common applications include laptop and notebook computers, tablets, portable medical devices, and industrial handheld instruments).
