The part number "TPS57140QDGQRQ1" corresponds to a Texas Instruments (TI) product. This part is a high-efficiency buck converter, designed primarily for DC-DC conversion in Power supplies. It's important to note that this product is built for automotive-grade applications, ensuring its durability and performance under harsh environmental conditions.
Packaging and Pinout Description:
The TPS57140QDGQRQ1 comes in the QFN-20 (Quad Flat No-lead) package, which means it has 20 pins. This packaging is compact and efficient, ideal for applications where space is limited. The pins on this component are crucial for the operation and performance of the IC.
Pin Function Specifications and Circuit Principles:
Here’s the detailed list of pin functions for the TPS57140QDGQRQ1 in the QFN-20 package, which contains 20 pins in total:
Pin Number Pin Name Pin Function 1 VIN This pin is the input voltage supply for the IC. It powers the internal circuitry of the device. The input voltage should be within the specified operating range of 4.5V to 60V. 2 EN Enable pin for turning the IC on or off. When this pin is high, the device is enabled, and when it is low, the device is disabled. It is usually pulled high through a resistor to ensure proper operation unless disabled. 3 VOUT Output voltage pin. This is where the regulated output voltage is available. The voltage is determined by feedback from the external resistors connected to the FB pin. 4 SW Switch pin for the power transistor . This is where the internal MOSFET's switching action occurs. It connects directly to the external inductor and is used to transfer energy to the load. 5 FB Feedback pin for regulating the output voltage. The voltage at this pin is compared to the reference voltage internally. The voltage divider on the output determines this feedback. 6 PGND Power ground pin. This is the reference ground for the power stage of the IC, providing a low-impedance path for the switching current. 7 AGND Analog ground pin. This is the reference ground for the analog circuitry of the IC. It should be tied to the system ground. 8 SS/TRK Soft-start and tracking pin. This pin is used to control the ramp-up time of the output voltage and can be used to track another supply in multi-rail systems. A capacitor is typically used to control the time constant of the soft start. 9 V5 Internal 5V regulator output. This pin can supply a 5V voltage reference for use by external circuitry, providing a stable reference for the controller's internal operations. 10 PG Power good indicator pin. This output is high when the output voltage is within the desired range, indicating proper operation. If the output voltage is outside the specified range, this pin will be low. 11 COMP Compensation pin for external frequency compensation network. The external components connected to this pin determine the stability and response of the feedback loop. 12 BOOT Bootstrapped voltage pin. Used to power the internal high-side MOSFET gate. A capacitor is typically connected between this pin and the SW pin to ensure proper operation of the switching MOSFETs . 13 NC No connection pin. This pin does not have any internal function and is left unconnected. 14 NC No connection pin. Like pin 13, this pin is not used internally and can be left unconnected. 15 VIN Repeated input voltage pin. This pin provides another connection for the input voltage to minimize resistance or optimize PCB layout. 16 VOUT Repeated output voltage pin. Similar to pin 3, providing another output connection for voltage distribution to reduce board trace resistance. 17 NC No connection pin. This pin is left unconnected, similar to the other NC pins. 18 NC Another no connection pin. 19 NC Yet another no connection pin, which may serve as a placement or grounding feature in the design. 20 SW Repeated switch pin, to provide another connection to the switch node. This pin, like pin 4, allows for the efficient transfer of energy during the switching operation.Frequently Asked Questions (FAQs):
Q: What is the input voltage range for the TPS57140QDGQRQ1? A: The input voltage range for the TPS57140QDGQRQ1 is from 4.5V to 60V.
Q: How do I turn on the TPS57140QDGQRQ1? A: To turn on the TPS57140QDGQRQ1, you need to drive the EN pin high.
Q: What is the recommended output voltage for the TPS57140QDGQRQ1? A: The output voltage depends on the external resistors connected to the FB pin. The device can regulate the output from 0.8V up to the input voltage minus dropout.
Q: Can I use the TPS57140QDGQRQ1 for 12V input voltage? A: Yes, the TPS57140QDGQRQ1 can operate with an input voltage of 12V, provided it is within the specified range of 4.5V to 60V.
Q: What is the purpose of the SW pin? A: The SW pin connects to the inductor and is used to transfer energy from the power stage to the load during the switching operation.
Q: How can I check if the TPS57140QDGQRQ1 is working properly? A: You can monitor the PG pin. If it is high, the device is operating within the desired output voltage range.
Q: What is the function of the SS/TRK pin? A: The SS/TRK pin is used for soft-start or tracking other voltages in multi-rail systems. A capacitor connected here controls the ramp-up time of the output voltage.
Q: Can the TPS57140QDGQRQ1 be used in automotive applications? A: Yes, the TPS57140QDGQRQ1 is an automotive-grade device and is designed for use in such environments.
Q: How do I handle thermal management for the TPS57140QDGQRQ1? A: The device has a thermal shutdown feature that disables the output if the junction temperature exceeds safe limits. Ensure proper PCB layout for heat dissipation.
Q: How can I enable or disable the TPS57140QDGQRQ1? A: You can enable or disable the device by controlling the EN pin, which must be high to enable the device.
Q: What should I connect to the AGND and PGND pins? A: AGND is the reference ground for the analog portion of the IC, while PGND is the power ground. Both should be tied to the system ground but should be kept separate for noise reduction.
Q: What capacitor value should I use at the BOOT pin? A: A 0.1µF ceramic capacitor is typically recommended between the BOOT pin and SW pin for proper gate drive operation.
Q: Can I use the 5V output from the V5 pin? A: Yes, the V5 pin provides a 5V regulated output that can be used to power other components within your design.
Q: How do I set the output voltage of the TPS57140QDGQRQ1? A: The output voltage is set by external resistors that form a voltage divider, which is connected to the FB pin.
Q: Is the TPS57140QDGQRQ1 suitable for low-power applications?
