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BQ25798 - 5-A Buck-Boost Battery Charger

Description

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.

Features

  • High power density, high integration buck-boost charger for 1-4 cell batteries supporting 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.
  • 5-A charging current with 10-mA resolution.
  • 96.5% efficient: 16-V battery at 3A from 20V.
  • Supports a wide range of input sources.
  • Autonomously sampled open ci.

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Full PDF Text Transcription

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BQ25798 SLUSDV2B – MAY 2020 – REVISED JANUARY 2023 BQ25798 I2C Controlled, 1- to 4-Cell, 5-A Buck-Boost Battery Charger with Dual-Input Selector, MPPT for Solar Panels and Fast Backup Mode 1 Features • High power density, high integration buck-boost charger for 1-4 cell batteries supporting 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 – 5-A charging current with 10-mA resolution • 96.5% efficient: 16-V battery at 3A from 20V • Supports a wide range of input sources – Autonomously sampled open circuit voltage (VOC) maximum power point tracking (MPPT) for charging from a photovoltaic panel – 3.
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