Texas Instruments BQ25708 SMBus Buck-Boost Charge Controllers

Texas Instruments BQ25708 SMBus Multi-Chemistry Battery Buck-Boost Charge Controllers are NVDC (narrow voltage DC) controllers designed for multi-chemistry portable applications. The BQ25708 provides a low component count and supports a wide range of power sources, including USB PD ports, legacy USB ports, traditional ACDC adapters, and more. The device allows a seamless transition between converter operation modes (buck, boost, or buck-boost), fast transient response, and high light load efficiency. The charger sets the converter to buck, boost, or buck-boost configuration based on the input source and battery conditions during power-up. The Dynamic Power Management (DPM) feature limits the input power and avoids the AC adapter overloading. An additional feature includes programmed comprehensive PROCHOT profile output that goes directly to the CPU for throttle back as required.

Features

Charge any battery chemistry of Li+, LiFePO4, NiCd, NiMH, Lead Acid
Charge 1- to 4-cell batteries from a wide range of input sources
- 3.5V to 24V Input operating voltage
- Supports USB2.0, USB 3.0, USB 3.1 (Type C), and USB_PD input current settings
- Seamless transition between buck and boost operation
- Input current and voltage regulation (IDPM and VDPM) against source overload
Power/current monitor for CPU throttling
- Comprehensive PROCHOT profile, IMVP8 compliant
- Input and battery current monitor
- System power monitor, IMVP8 compliant
Narrow-VDC (NVDC) power path management
- Instant-on with no battery or deeply discharged battery
- Battery supplements system when an adapter is fully-loaded
- Ideal diode operation in supplement mode

800kHz or 1.2MHz Programmable switching frequency for 1µH to 3.3µH inductor
Host control interface for flexible system configuration
- SMBus Port for optimal system performance and status reporting
- Hardware pin to set input current limit without EC control
Integrated ADC to monitor voltage, current and power
High-accuracy regulation and monitor
- ±0.5% Charge voltage regulation
- ±2% Input/Charge current regulation
- ±2% Input/Charge current monitor
- ±5% Power monitor
Safety
- Thermal shutdown
- Input, system, battery overvoltage protection
- MOSFET Inductor overcurrent protection
Low battery quiescent current
Input Current Optimizer (ICO) to extract max input power
32-Pin 4 × 4 WQFN Package