BQ25798 Series
I²C controlled, 1-4-cell, 5-A buck-boost solar battery charger with dual-input selector and MPPT
Manufacturer: Texas Instruments
Link to Manufacturer Page: https://www.ti.com/
Catalog
I²C controlled, 1-4-cell, 5-A buck-boost solar battery charger with dual-input selector and MPPT
| Part | Interface | Mounting Type | Supplier Device Package | Current - Charging | Battery Pack Voltage [Max] | Operating Temperature [Max] | Operating Temperature [Min] | Number of Cells [Max] [custom] | Number of Cells [Min] [custom] | Fault Protection | Charge Current - Max [Max] | Package / Case | Battery Chemistry | Programmable Features | Voltage - Supply (Max) [Max] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments BQ25798RQMR | I2C | Surface Mount | 29-VQFN-HR (4x4) | Constant | 18.8 V | 85 °C | -40 °C | 4 | 1 | Over Current, Over Voltage | 5 A | 29-VFQFN | Lithium Ion/Polymer | Current, Timer, Voltage | 24 V |
Key Features
• High power density, high integration buck -boost charger for 1-4 cell batteries supporting USB PD 3.0 profileIntegrates four switching MOSFETs, BATFETIntegrates input and charging current sensingHighly efficient750-kHz or 1.5-MHz switching frequencies5-A charging current with 10-mA resolution96.5% efficient: 16-V battery at 3A from 20VSupports a wide range of input sourcesAutonomously sampled open circuit voltage (VOC) maximum power point tracking (MPPT) for charging from a photovoltaic panel3.6-V to 24-V wide input operating voltage range with 30-V absolute maximum ratingDetects USB BC1.2, HVDCP and non-standard adaptersDual-input power mux controller (optional)Narrow voltage DC (NVDC) power pathBackup Mode with Ultra-fast switchover to adjustable voltagePowers USB port from battery (USB OTG)2.8-V to 22-V OTG output voltage with 10-mV resolution to support USB-PD PPSOTG output current regulation up to 3.32 A with 40-mA resolutionFlexible autonomous and I2C mode for optimal system performanceIntegrated 16-bit ADC for voltage, current, and temperature monitoringLow battery quiescent current17 µA for battery only operation500 nA in Charger Shutdown ModeHigh accuracy-0.25% to +0.65% charge voltage regulation for 2S batteries±5% charge current regulation±5% input current regulationSafetyThermal regulation and thermal shutdownInput/battery OVP and OCPConverter MOSFETs OCPCharging safety timerPackage29-Pin 4 mm × 4 mm QFNHigh power density, high integration buck -boost charger for 1-4 cell batteries supporting USB PD 3.0 profileIntegrates four switching MOSFETs, BATFETIntegrates input and charging current sensingHighly efficient750-kHz or 1.5-MHz switching frequencies5-A charging current with 10-mA resolution96.5% efficient: 16-V battery at 3A from 20VSupports a wide range of input sourcesAutonomously sampled open circuit voltage (VOC) maximum power point tracking (MPPT) for charging from a photovoltaic panel3.6-V to 24-V wide input operating voltage range with 30-V absolute maximum ratingDetects USB BC1.2, HVDCP and non-standard adaptersDual-input power mux controller (optional)Narrow voltage DC (NVDC) power pathBackup Mode with Ultra-fast switchover to adjustable voltagePowers USB port from battery (USB OTG)2.8-V to 22-V OTG output voltage with 10-mV resolution to support USB-PD PPSOTG output current regulation up to 3.32 A with 40-mA resolutionFlexible autonomous and I2C mode for optimal system performanceIntegrated 16-bit ADC for voltage, current, and temperature monitoringLow battery quiescent current17 µA for battery only operation500 nA in Charger Shutdown ModeHigh accuracy-0.25% to +0.65% charge voltage regulation for 2S batteries±5% charge current regulation±5% input current regulationSafetyThermal regulation and thermal shutdownInput/battery OVP and OCPConverter MOSFETs OCPCharging safety timerPackage29-Pin 4 mm × 4 mm QFN
Description
AI
The BQ25798 is a fully integrated switch-mode buck -boost charger for 1-4 cell Li-ion batteries and Li-polymer batteries. The integration includes 4 switching MOSFETs, input and charging current sensing circuits, the battery FET and all the loop compensation of the buck-boost converter. It uses NVDC power path management, regulating the system not dropping below a configurable minimum system voltage. When system power exceeds the input source rating, battery supplement mode supports the system without overloading the input source. BQ25798 also maximizes power from photovoltaic panels using its built-in VOCscaling MPPT algorithm. BQ25798 supports ultra-fast switchover from the adapter to a converted battery voltage in Backup Mode.
The BQ25798 is a fully integrated switch-mode buck -boost charger for 1-4 cell Li-ion batteries and Li-polymer batteries. The integration includes 4 switching MOSFETs, input and charging current sensing circuits, the battery FET and all the loop compensation of the buck-boost converter. It uses NVDC power path management, regulating the system not dropping below a configurable minimum system voltage. When system power exceeds the input source rating, battery supplement mode supports the system without overloading the input source. BQ25798 also maximizes power from photovoltaic panels using its built-in VOCscaling MPPT algorithm. BQ25798 supports ultra-fast switchover from the adapter to a converted battery voltage in Backup Mode.