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Frequent questions

  • [FAQ] BQ25120A: What are the device choices? The BQ25120A, BQ25121A, BQ25122, BQ25123, BQ25125, etc., look very similar?

    Part Number: BQ25120A Other Parts Discussed in Thread: BQ25125 , BQ25123 , BQ25121A , BQ25122 , BQ25120F3A The devices BQ25120A, BQ25121A, BQ25122, BQ25123, BQ25125, etc., are all part of the same family of battery chargers: BQ25120x. They function…

  • [FAQ] BQ25120A: Can I drive the /MR pin externally through a GPIO?

    Part Number: BQ25120A Other Parts Discussed in Thread: BQ21061 The Manual Reset Input (/MR) is pulled up internally to BAT. To drive the signal with a microcontroller (MCU) you can use a N-Channel mosfet (nMOS) to mimic a "press" action from the MCU.…

  • [FAQ] BQ25120A: What is the purpose of the watchdog timer? Can I disable the watchdog timer?

    Part Number: BQ25120A Other Parts Discussed in Thread: BQ25121A , BQ25120F3A In microcontroller applications, the watchdog timer is use to assure the host is still responsive and have not stopped operating. The BQ25120A has a 50-s watchdog timer that…

  • [FAQ] BQ25120A: What is the purpose of the /CD pin? Do I need to connect it to my MCU?

    Part Number: BQ25120A On the BQ25120A the chip disable (/CD) input pin is used to disable the device and has dual functionality based on if the adapter (VIN) is present. Battery Only Mode: When operating on battery only mode the /CD pin is used to…

  • [FAQ] BQ25120A: What is shipmode and why do I need it?

    Part Number: BQ25120A Shipmode is the state of the device where is in the lowest power consumption. After manufacturing, the product will be on storage for a long time before reaching the consumers hands. Nowadays, we want to use the device out of the…

  • [FAQ] BQ25120A: How do I enter and exit ship-mode?

    Part Number: BQ25120A The charger can enter shipmode by: To enter shipmode on the BQ25120A, the device should be operating on battery-only mode (V IN < V UVLO ), and /CD and /MR must be high. Then you can: Send the I2C command EN_SHIPMODE = 1…

  • [FAQ] TPS549D22: What to do with the PMBus pins when the PMBus interface is not used

    Part Number: TPS549D22 Other Parts Discussed in Thread: TPS548B22 , TPS548D22 Depending on the available supply, customers may ask if they can use PMBus parts such as the TPS549D22 or TPS549D22 in place of their pin-to-pin counterparts that lack a PMBus…

  • [FAQ] How does load conditions, output capacitance and headroom affect my space rated LDOs Power Supply Rejection Ratio (PSRR) performance?

    Other Parts Discussed in Thread: TPS7H1111-SP , TPS7H1101A-SP , TPS7A4501-SP Answer: Looking at two of our most popular space rated Class V Low DropOut (LDO)s in our offering, and our upcoming release to market for our flagship ultra-low noise, high…

  • [FAQ] UCC21520: How can I use an ENable pin as a DISable and vise versa?

    Part Number: UCC21520 Other Parts Discussed in Thread: UCC21521 , How can I use an ENable pin as a DISable and vise versa?

  • [FAQ] TPS92633-Q1: How to design with TPS92633-Q1 in five minutes?

    Part Number: TPS92633-Q1 Other Parts Discussed in Thread: TPS92624-Q1 , TPS92623-Q1 Hi team, What are the prominent features of TPS92633-Q1? How can the external resistor components of the TPS92633-Q1 be designed? What should I pay attention…

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