Comparison of Battery Charger Alternatives

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Below is a comparison table between the BQ24075 alternatives based on available information from the BQ24075RGTT datasheet. Note that many parameters across these variants are nearly identical—with the primary difference being the operating input range—and exact numeric values for charge voltage and quiescent current are typically determined by external programming (resistor selections) and thermal/algorithm conditions in the battery charger design. For a detailed comparison of each specific parameter, you would need to consult the individual datasheets. In summary:

Table

PartInput Voltage RangeCharge VoltageCharge Current (Max)Quiescent CurrentSupported Battery ChemistriesCharging Algorithm
BQ24075RGTT4.35 V to 6.6 VSet by battery spec*Up to 1.5 ANot explicitly specified*Single-cell Lithium-ionThree-phase: pre-charge, constant-current fast charge, CV taper
BQ24075RGTT (alt.)4.35 V to 6.6 VSet by battery spec*Up to 1.5 ANot explicitly specified*Single-cell Lithium-ionThree-phase: pre-charge, constant-current fast charge, CV taper
BQ24079RGTT4.35 V to 6.6 VSet by battery spec*Up to 1.5 ANot explicitly specified*Single-cell Lithium-ionThree-phase: pre-charge, constant-current fast charge, CV taper
BQ24072RGTT4.35 V to 6.6 VSet by battery spec*Up to 1.5 ANot explicitly specified*Single-cell Lithium-ionThree-phase: pre-charge, constant-current fast charge, CV taper
BQ24074RGTT4.35 V to 10.5 VSet by battery spec*Up to 1.5 ANot explicitly specified*Single-cell Lithium-ionThree-phase: pre-charge, constant-current fast charge, CV taper
* "Set by battery spec" means that the charge voltage is established according to the application requirements (commonly near 4.2 V for Li-ion cells) and is maintained by the constant-voltage (CV) phase of the charger.
Key points:
  • Input Voltage Range: Four of the variants (BQ24075RGTT, its alternate, BQ24079RGTT, and BQ24072RGTT) share a 4.35 V to 6.6 V range. The BQ24074RGTT extends the range to 10.5 V for applications requiring higher input voltage.
  • Charge Voltage & Current: The datasheet explains a three-phase charging process where the battery is pre-charged, then fast charged (constant-current), and finally charged under constant-voltage conditions. The fast-charge phase is designed to run at a maximum current of about 1.5 A, though the exact voltage setpoint is determined by your battery selection.
  • Quiescent Current: The datasheet does not provide a direct numeric value, as it depends on several factors including mode and external programming via resistor networks.
  • Supported Battery Chemistries: All variants are designed for single-cell lithium-ion batteries.
  • Charging Algorithm: All use a multi-phase charging cycle with pre-charge, constant-current fast-charge, and constant-voltage taper phases with built-in protections including thermal regulation.
For an in-depth numerical comparison (for example, testing conditions, exact quiescent current values, and programmable settings), you should review each part’s individual datasheet if available. Let me know if you would like to retrieve further details from any of the datasheets.
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