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Texas Instruments bq25620/bq25622 Buck Battery Chargers

Texas Instruments bq25620/bq25622 Buck Battery Chargers are highly integrated 3.5A switch-mode battery charge management and system power path management devices for single-cell Li-Ion and Li-polymer batteries. The solution is highly integrated with built-in current sensing, loop compensation, input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and battery FET (BATFET, Q4) between system and battery. It uses narrow VDC power path management, regulating the system slightly above the battery voltage without dropping below a configurable minimum system voltage. The low-impedance power path optimizes switch-mode operation efficiency, reduces battery charging time, and extends battery life during the discharging phase. The ultra-low 0.15µA ship mode current extends battery shelf life. The I²C serial interface with charging and system settings make the Texas Instruments bq25620/bq25622 truly flexible solutions.

Features

High-efficiency, 1.5MHz, synchronous switching mode buck charger for single-cell battery
- > 90% efficiency down to 25mA charge current from 5V input
- Charge termination from 10mA to 620mA, 10mA steps
- Flexible JEITA profile for safe charging over temperature
BATFET control to support the shutdown, ship mode, and full system reset
- 1.5µA quiescent current in battery-only mode
- 0.15µA battery leakage current in ship mode
- 0.1µA battery leakage current in shutdown
Supports USB On-The-Go (OTG)
- Boost mode operation supporting 3.84V to 9.6V output
- > 90% boost efficiency down to 100mA OTG current for 5V V_BUS
Supports a wide range of input sources
- 3.9V to 18V wide input operating voltage range with 26V absolute maximum input voltage
- Maximizes source power with input voltage regulation (VINDPM) and input current regulation (IINDPM)
- VINDPM threshold automatically tracks battery voltage

Efficient battery operation with 15mΩ BATFET
Narrow VDC (NVDC) power path management
- System instant-on with depleted or no battery
- Battery supplement when the adapter is fully loaded
Flexible autonomous or I²C-controlled modes
Integrated 12-Bit ADC for voltage, current, and temperature monitoring
High accuracy
- ±0.5% charge voltage regulation
- ±5% charge current regulation
- ±5% input current regulation
Safety
- Thermal regulation and thermal shutdown
- Input, system, battery overvoltage protection
- Battery, converter overcurrent protection
- Charging safety timer

Applications

Tablet
Gaming and computer accessories

IP camera, EPOS
Portable medical equipment

Texas Instruments bq25620/bq25622 Buck Battery Chargers

Features

Applications

Simplified Aplication Diagram

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