Overview
The BQ24133RGYT, produced by Texas Instruments, is a highly integrated stand-alone Li-Ion and Li-Polymer switched-mode battery charger. This device features a constant-frequency synchronous PWM controller with two integrated N-channel power MOSFETs, offering high accuracy regulation of input current, charge current, and voltage. It supports charging one, two, or three cells at a fixed 4.2 V/cell and operates in three phases: preconditioning, constant current, and constant voltage. The BQ24133 also includes an automatic power path selector between the adapter and battery, dynamic power management, and integrated safety features such as thermal regulation and overvoltage protection.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Switching Frequency | Constant-frequency synchronous PWM controller | 1.6 MHz |
| Integrated N-MOSFETs | Current rating | 2.5 A |
| Efficiency | Maximum efficiency | Up to 92% |
| Input Voltage Rating | Maximum input voltage | 30 V |
| Input Operating Voltage | Operating voltage range | 4.5 V to 17 V |
| Battery Charge Voltage | Charge voltage per cell | 4.2 V/cell (1, 2, or 3 cells) |
| Thermal Regulation | Junction temperature limit | 120°C |
| Charge Voltage Regulation | Accuracy of charge voltage regulation | ±0.5% |
| Charge Current Regulation | Accuracy of charge current regulation | ±5% |
| Input Current Regulation | Accuracy of input current regulation | ±6% |
| Package Type | Package and pin count | 24-pin, 5.5-mm × 3.5-mm thin VQFN |
Key Features
- 1.6-MHz synchronous switched-mode charger with 2.5-A integrated N-MOSFETs
- Up to 92% efficiency
- 30-V input rating with adjustable overvoltage protection
- 4.5-V to 17-V input operating voltage
- Automatic power path selector between adapter and battery
- Dynamic power management
- Integrated 20-V switching MOSFETs and bootstrap diode
- Internal digital soft start
- Thermal regulation loop throttles back current to limit Tj = 120°C and thermal shutdown
- Battery thermistor sense for hot/cold charge suspend and battery detect
- Adjustable input overvoltage protection and cycle-by-cycle current limit
Applications
- Tablet PCs
- Netbooks and ultra-mobile computers
- Portable data capture terminals
- Portable printers
- Medical diagnostics equipment
- Battery bay chargers
- Battery back-up systems
Q & A
- What is the switching frequency of the BQ24133?
The BQ24133 operates at a constant-frequency synchronous PWM controller with a switching frequency of 1.6 MHz.
- What is the maximum current rating of the integrated N-MOSFETs?
The integrated N-MOSFETs have a maximum current rating of 2.5 A.
- What is the efficiency of the BQ24133?
The BQ24133 has an efficiency of up to 92%.
- What is the input voltage range of the BQ24133?
The input operating voltage range is from 4.5 V to 17 V, with a maximum input voltage rating of 30 V.
- How many cells can the BQ24133 charge, and at what voltage?
The BQ24133 can charge one, two, or three cells at a fixed 4.2 V/cell.
- What safety features does the BQ24133 include?
The BQ24133 includes thermal regulation, thermal shutdown, battery thermistor sensing, adjustable input overvoltage protection, and cycle-by-cycle current limit.
- How does the power path selector work in the BQ24133?
The power path selector automatically switches between the adapter and battery, preventing the battery from boosting back to the input when the adapter is present.
- What is the package type and pin count of the BQ24133?
The BQ24133 is available in a 24-pin, 5.5-mm × 3.5-mm thin VQFN package.
- What are some typical applications of the BQ24133?
Typical applications include tablet PCs, netbooks, portable data capture terminals, portable printers, medical diagnostics equipment, battery bay chargers, and battery back-up systems.
- How does the BQ24133 manage battery charging in different temperature conditions?
The BQ24133 closely monitors the battery pack temperature to allow charge only in a preset temperature window and includes battery thermistor sensing for hot/cold charge suspend and battery detect.
