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Frequent questions

  • [FAQ] BQ25120A: What is the maximum current I can pull from PMID?

    Part Number: BQ25120A The maximum discharge current you can pull from the PMID output depends on if adapter (VIN) is present or not. Operating on BAT only mode, the max current from PMID will be your Current Limit on Discharge Mode (IBAT_OCP). When the…

  • [FAQ] BQ25120A: What's the difference between PMID, SW, LDO? Are they all connect to the load and in what situation do I need to use?

    Part Number: BQ25120A The BQ25120A is a highly integrated power management unit which includes integrated power rails: a buck converter (SW/SYS) and a linear regulator (LDO/LS). The charger is also part of our power path family which includes the PMID…

  • [FAQ] BQ25120A: How do I perform battery monitoring with the BQ25120A registers?

    Part Number: BQ25120A The BQ25120A implements a simple voltage battery monitor which can be used to determine the depth of discharge of your battery. A high-level representation of the circuit can be seen on Figure 17 of the datasheet. Table 2 provides…

  • [FAQ] BQ25120A: How does DPPM work (VINDPM and VDPPM)? Can I use DPPM to improve the battery charging?

    Part Number: BQ25120A The dynamic power path management (DPPM) of the BQ25120A will separate the charging current from system current. When you have a valid IN source, current is shared at the PMID between charging the battery and providing system load…

  • [FAQ] BQ25120A: Schematics Questions: What capacitor ratings should I pick? How do I pick the right inductor for the DC-DC converter? Do I need to tie the PGND and GND together? Is there a schematic checklist?

    Part Number: BQ25120A What capacitor ratings should I pick? For choosing the capacitor voltage we recommend looking into Pins Functions section of the BQ25120A datasheet, where the recommended capacitor value will be mentioned. For selecting the right…

  • [FAQ] BQ25120A: I am controlling the BQ25120A via I2C, do I still need to include the IPRETERM, ISET and ILIM resistors?

    Part Number: BQ25120A If using the BQ25120A as a standalone device, you should connect the ILIM/IPRETERM and ISET resistors to configure your current limit and fast charge parameter following the D/S recommendation. If configuring the BQ25120A via I2C…

  • [FAQ] BQ25120A: Can I change the DC-DC voltage (VSYS) and the LDO voltage (LS/LDO) dynamically through I2C?

    Part Number: BQ25120A Yes, you can change the system voltage (VSYS) and also disable the output on the SYS VOUT Control Register (0x06). The output can be programmable from 1.1V up to 3.3V. Yes, you can also change the LDO/LS voltage and also disable…

  • [FAQ] BQ25120A: Can I pullup the /INT and /PG to any voltage? Where do I need to pull up the I2C pins to?

    Part Number: BQ25120A On the BQ25120A, both the /INT (Status Output) pin and /PG (Power Good) pins are an open-drain outputs, you can connect these pins via a pull up resistor or LED to the desired logic voltage. If monitoring the /INT or /PG pins via…

  • [FAQ] BQ25120A: What are the differences between the BQ25120 and the BQ25120A?

    Part Number: BQ25120A Other Parts Discussed in Thread: BQ25120 , The BQ25120A is the new revision of the BQ25120 (not recommend for new designs). They are pin-to-pin and software compatible, but the BQ25120A has added improvements such as: Added quick…

  • [FAQ] BQ25120A: Can I use the BQ25120A as a standalone device without an I2C controller?

    Part Number: BQ25120A Yes, you can configure the BQ25120A as a standalone device by configuring the current limit, fast charge current and termination current. To do so you will need to select the appropriate resistors for the ILIM, ISET and IPRETERM…

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