BQ25790
Description
The BQ25790 is a fully integrated switch-mode buckboost charger for 1-4 cell Li-ion battery and Lipolymer battery. The integration includes 4 switching MOSFETs (Q1, Q2, Q3, Q4), input and charging current sensing circuits, the battery FET (QBAT) and all the loop compensation of the buck-boost converter.
Key Features
- 1 High efficient synchronous Switch Mode buckboost charger for 1-4 cell battery - 750-kHz and 1.5-MHz Programmable switching frequencies - Efficiency optimized for charging 2s battery, 96.5% efficiency with 9-V input and 94.5% efficiency with 15-V input at 3-A ICHG - Charging current up to 5 A with 10-mA resolution
- Support wide range of input sources - 3.6-V to 24-V Wide input operating voltage range with 30-V absolute maximum rating - Maximum power tracking with VINDPM up to 22 V and IINDPM up to 3.3 A - Detect USB BC1.2, SDP, CDP, DCP, HVDCP and non-standard adapters
- Dual-input power mux controller for source selection
- High level integration - Four switching MOSFETs and BATFET - Input current and charging current sensing
- Narrow-VDC (NVDC) Power Path management
- Power USB port from battery (USB OTG) - 2.8-V to 22-V OTG output voltage with 10-mV resolution to support USB-PD PPS - OTG Output current regulation up to 3.32 A with 40-mA resolution
- Flexible autonomous and I2C mode for optimal system performance
- Integrated 16-bit ADC for voltage, current and temperature monitor
- Low battery quiescent current - Typical 21-µA at battery only operation - Typical 600 nA in Charger Shutdown Mode
- High accuracy - ±0.5% Charge voltage regulation for 2s battery - ±5% Charge current regulation - ±5% Input current regulation
