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Frequent questions

  • [FAQ] What hardware interface is required to communicate with UCD90xxx devices?

    UCD90xxx devices use PMBus communication. Both configuration and monitoring use the same PMBus interface. UCD90xxx devices are PMBus slaves, so you need to have a PMBus host to communicate with them. This PMBus host can be an MCU or FPGA implementation…

  • [FAQ] How does the BATFET work in the BQ25790, BQ25792, BQ25798, and BQ25672?

    Part Number: BQ25790 Other Parts Discussed in Thread: BQ25798 , BQ25792 , BQ25672 There is a BATFET between the system (SYS) and the battery (BAT) in the integrated buck boost chargers BQ25790, BQ25792, and BQ25798 and the integrated buck charger BQ25672…

  • [FAQ] TPS54320: SWIFT™︎ mentioned in tps54320 introduction ™︎ Principle and characteristics of

    Part Number: TPS54320 Other Parts Discussed in Thread: TPS54302 , TPS563201 Hi， The customer asked me about SWIFT in tps54320 ，what does it mean? Is the internal structure and function of such devices different from other devices (such as tps54302 or…

  • [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…

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