Overview
The Texas Instruments BQ24747RHDR is a high-efficiency, synchronous battery charger integrated circuit designed for multi-chemistry battery charging applications. Although this component is currently obsolete and no longer manufactured, it remains relevant for understanding advanced battery charging technologies. The BQ24747RHDR features an internal soft-start, input-current comparator, and dynamic power management (DPM), making it suitable for space-constrained designs. It supports charging of two, three, or four series Li+ cells, as well as other battery chemistries like NiCd, NiMH, and Lead Acid.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| DCIN Input-Voltage Operating Range | 7 - 24 | V |
| Battery Voltage Range | 1.024 - 19.2 | V |
| Charge Voltage Regulation Accuracy | ±0.5% | % |
| Charge Current Regulation Range | 128 mA - 8.064 A | A |
| Adapter Current Limit DPM Range | 256 mA - 11.008 A | A |
| Input Current Sense Amp Accuracy | ±2% | % |
| PWM Switching Frequency | 240 - 360 kHz | kHz |
| Package Type | 28-pin, 5x5 mm2 QFN |
Key Features
- High-efficiency synchronous buck converter with >95% efficiency
- Internal soft-start and input-current comparator
- Dynamic Power Management (DPM) and input power limiting
- SMBus-controlled interface for easy programming by system power-management microcontroller
- High-accuracy voltage and current regulation: ±0.5% charge voltage accuracy, ±3% charge current accuracy
- Supports charging of Li+, NiCd, NiMH, and Lead Acid batteries
- Integrated current sense amplifier for precise measurement of input current
- Input overvoltage protection (OVP) and adjustable threshold and hysteresis for input current comparator
- Low quiescent current: < 10 μA battery current with adapter removed
Applications
- Notebook and ultra-mobile computers
- Portable data-capture terminals
- Portable printers
- Medical diagnostics equipment
- Battery bay chargers
- Battery backup systems
Q & A
- What is the BQ24747RHDR? The BQ24747RHDR is a high-efficiency, synchronous battery charger IC from Texas Instruments.
- Why is the BQ24747RHDR obsolete? The BQ24747RHDR is no longer manufactured by Texas Instruments, but it remains relevant for understanding advanced battery charging technologies.
- What battery chemistries does the BQ24747RHDR support? It supports Li+, NiCd, NiMH, and Lead Acid batteries.
- What is the input-voltage operating range of the BQ24747RHDR? The input-voltage operating range is 7 V to 24 V.
- What is the charge voltage regulation accuracy of the BQ24747RHDR? The charge voltage regulation accuracy is ±0.5%.
- How does the BQ24747RHDR manage power dynamically? It features Dynamic Power Management (DPM) and input power limiting to reduce battery-charge current when the input power limit is reached.
- What interface does the BQ24747RHDR use for control? It uses an SMBus-controlled interface for easy programming by the system power-management microcontroller.
- What is the PWM switching frequency of the BQ24747RHDR? The PWM switching frequency is between 240 kHz and 360 kHz.
- What is the package type of the BQ24747RHDR? It is available in a 28-pin, 5x5 mm2 QFN package.
- What safety features does the BQ24747RHDR include? It includes input overvoltage protection (OVP) and adjustable threshold and hysteresis for the input current comparator.
