Overview
The BQ25895MRTWT from Texas Instruments is a highly-integrated 5-A switch-mode battery charge management and system power path management device designed for single cell Li-Ion and Li-polymer batteries. This device supports high input voltage fast charging and features a low impedance power path that optimizes switch-mode operation efficiency, reduces battery charging time, and extends battery life during the discharging phase. It is ideal for a wide range of portable devices, including smartphones, tablets, and other mobile equipment.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | WQFN (RTW) | 24 pins |
| Operating Temperature Range | -40°C to 85°C | |
| Output Current (Charge) | Up to 5 A | |
| Output Current (Boost) | Up to 3.1 A | |
| Input Voltage Range | 3.9 V to 14 V | |
| Input Current Limit | 100 mA to 3.25 A (50-mA resolution) | |
| Charge Efficiency | 93% at 2 A, 91% at 3 A | |
| Boost Efficiency | 93% at 5 V, 1 A output | |
| Switching Frequency | 500 kHz to 1.5 MHz | |
| Battery Discharge MOSFET | 11-mΩ, up to 9 A | |
| Low Battery Leakage Current | 12 µA | |
| Charge Voltage Regulation | ±0.5% | |
| Charge Current Regulation | ±5% | |
| Input Current Regulation | ±7.5% |
Key Features
- High efficiency 5-A, 1.5-MHz switch mode buck charge
- Low Power PFM Mode for light load operations
- Boost Mode operation with adjustable output from 4.5 V to 5.5 V
- Selectable 500-KHz to 1.5-MHz boost converter with up to 3.1-A output
- Integrated control to switch between charge and Boost Mode
- Single input to support USB input and adjustable high voltage adapters
- Input current optimizer (ICO) to maximize input power without overloading adapters
- Resistance compensation (IRCOMP) from charger output to cell terminal
- Highest battery discharge efficiency with 11-mΩ battery discharge MOSFET up to 9 A
- Integrated ADC for system monitor (voltage, temperature, charge current)
- Narrow VDC (NVDC) power path management
- Instant-on works with no battery or deeply discharged battery
- Ideal diode operation in Battery Supplement Mode
- BATFET Control to support Ship Mode, wake up, and full system reset
- Flexible autonomous and I2C mode for optimal system performance
- High integration includes all MOSFETs, current sensing and loop compensation
- High accuracy: ±0.5% Charge voltage regulation, ±5% Charge current regulation, ±7.5% Input current regulation
- Safety features: Battery temperature sensing, thermal regulation, and thermal shutdown
Applications
- Power Banks
- Mobile Wi-Fi Hotspots
- Wireless Bluetooth Speakers
- Portable Internet Devices
- Smartphones and Tablets
- Other portable Li-Ion and Li-polymer battery-powered devices
Q & A
- What is the maximum charge current of the BQ25895MRTWT?
The maximum charge current is up to 5 A.
- What is the input voltage range supported by the BQ25895MRTWT?
The input voltage range is from 3.9 V to 14 V.
- What is the efficiency of the charge mode at 2 A and 3 A?
The charge efficiency is 93% at 2 A and 91% at 3 A.
- Does the BQ25895MRTWT support boost mode operation?
- What safety features are integrated into the BQ25895MRTWT?
The device includes battery temperature sensing, thermal regulation, and thermal shutdown.
- How does the BQ25895MRTWT manage input current?
The device features an input current optimizer (ICO) to maximize input power without overloading adapters and supports input current limits from 100 mA to 3.25 A with 50-mA resolution.
- What is the role of the BATFET in the BQ25895MRTWT?
The BATFET supports Ship Mode, wake up, and full system reset.
- Does the BQ25895MRTWT support I2C communication?
- What is the package type and pin count of the BQ25895MRTWT?
The device is packaged in a 24-pin WQFN (RTW) package.
- What is the operating temperature range of the BQ25895MRTWT?
The operating temperature range is from -40°C to 85°C.
