Overview
The BQ24640RVAR from Texas Instruments is a highly integrated, standalone synchronous switch-mode super capacitor charge controller. This device is designed to charge super capacitor packs from 2.1 V to 26 V, utilizing a constant-current and constant-voltage (CC/CV) charge profile. It features a high-efficiency 600-kHz NMOS-NMOS synchronous buck controller, achieving over 90% efficiency for up to 10-A charge current. The BQ24640RVAR is ideal for applications requiring precise charge voltage and current regulation, along with robust safety features.
Key Specifications
| Parameter | Specification |
|---|---|
| VCC Input Voltage Range | 5 V to 28 V |
| Charge Voltage Regulation | ±0.5% |
| Charge Current Regulation | ±3% |
| Charge Current Range | Up to 10 A |
| Switching Frequency | 600 kHz |
| Efficiency | Over 90% |
| Driver Dead Time | 30 ns |
| Maximum Effective Duty Cycle | 99.5% |
| Off-State Super Capacitor Discharge Current | <15 µA |
| Off-State Input Quiescent Current | <1.5 mA |
| Operating Temperature Range | -40°C to 85°C |
| Package Type | 16-VQFN (3.5x3.5 mm) |
Key Features
- High integration with internal loop compensation and digital soft start.
- Constant-frequency synchronous PWM controller.
- High accuracy charge current and voltage regulation.
- Safety features including input overvoltage protection, capacitor temperature sensing, and thermal shutdown.
- Status outputs for adapter present, charger operation status, and charge enable pin.
- Automatic sleep mode for low power consumption.
- Internal digital soft start and high integration.
Applications
- Memory backup systems.
- Industrial UPS systems and power transient buffering.
- Bridge power to buffer the battery.
Q & A
- What is the primary function of the BQ24640RVAR?
The BQ24640RVAR is a standalone synchronous switch-mode super capacitor charge controller.
- What is the input voltage range for the BQ24640RVAR?
The input voltage range is from 5 V to 28 V.
- What is the maximum charge current supported by the BQ24640RVAR?
The device supports up to 10 A of charge current.
- What safety features does the BQ24640RVAR include?
The device includes input overvoltage protection, capacitor temperature sensing, thermal shutdown, and other safety features.
- How does the BQ24640RVAR manage charge status?
The device uses status outputs for adapter present, charger operation status, and a charge enable pin to manage charge status.
- What is the operating temperature range of the BQ24640RVAR?
The operating temperature range is from -40°C to 85°C.
- What type of package does the BQ24640RVAR come in?
The device comes in a 16-VQFN (3.5x3.5 mm) package.
- How efficient is the BQ24640RVAR in charging super capacitors?
The device achieves over 90% efficiency for up to 10 A of charge current.
- Does the BQ24640RVAR support automatic sleep mode?
Yes, the device enters a low-current sleep mode for low power consumption when the input voltage falls below the output capacitor voltage.
- What are some common applications of the BQ24640RVAR?
Common applications include memory backup systems, industrial UPS systems, and power transient buffering.
