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I2C controlled, 1-4 cell, 5-A buck-boost solar battery charger with dual-input selector and MPPT

Inventory: 495  
Limit:  50

Quality information

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MSL rating / Peak reflow Call TI
Quality, reliability
& packaging information

Information included:

  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
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Packaging information

Package | Pins Package qty | Carrier: Operating temperature range (°C)
VQFN-HR (RQM) | 29 250 | SMALL T&R
-40 to 85
Package | Pins VQFN-HR (RQM) | 29
Package qty | Carrier: 250 | SMALL T&R
Operating temperature range (°C) -40 to 85
View TI packaging information

Features for the BQ25798

  • High power density, high integration buck-boost charger for 1-4 cell batteries supporting any USB PD 3.0 profile
    • Integrates four switching MOSFETs, BATFET
    • Integrates input and charging current sensing
  • Highly efficient
    • 750-kHz or 1.5-MHz switching frequencies
    • charging current with 10-mA resolution
      • 97.5% converter efficiency charging 12V battery at 1.5A from 12V PV Panel input
  • Supports a wide range of input sources
    • MPPT algorithm for charging from small photovoltaic panel
    • 3.6-V to 24-V wide input operating voltage range with 30-V absolute maximum rating
    • Detects USB BC1.2, SDP, CDP, DCP, HVDCP and non-standard adapters
  • Dual-input power mux controller (optional)
  • Narrow voltage DC (NVDC) power path management
  • Powers USB port from battery (USB OTG)
    • OTG output voltage with 10-mV resolution to support USB-PD Programmable Power Supply
    • 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 monitoring
  • Low battery quiescent current
    • 21-µA for battery only operation
    • 600 nA in charger shutdown mode
  • High accuracy
    • +0.65% to -0.85% charge voltage regulation for 2s-4s batteries
    • ±5% charge current regulation
    • ±5% input current regulation
  • Safety
    • Thermal regulation and thermal shutdown
    • Input/battery OVP and OCP
    • Converter MOSFETs OCP
    • Charging safety timer
  • Package
    • 29-Pin 4mm × 4mm QFN

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Description for the BQ25798

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 (Q1, Q2, Q3, Q4), input and charging current sensing circuits, the battery FET (QBAT) and all the loop compensation of the buck-boost converter. It uses NVDC power path management, regulating the system slightly above the battery voltage without 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. BQ25798provides a simple interface to small photovoltaic panels using its built-in VOC scaling MPPT algorithm.


Qty Price (USD)
1-99 5.078
100-249 4.14
250-999 3.254
1,000+ 2.76