The TPS7A8500RGRR is a part of Texas Instruments (TI), a well-known electronics brand. It is a high-performance, low-noise linear voltage regulator designed for use in a variety of sensitive applications.
Below, I'll provide a detailed explanation of the pin function specifications and the circuit principle instructions for this component. Additionally, I will create a table listing the pin functions and follow it with a FAQ section with 20 common questions regarding this part.
Package Type:
Package: QFN (Quad Flat No-leads) 48-Pin package. Dimensions: The TPS7A8500RGRR has a 48-pin QFN package.Pin Function Specifications and Circuit Principle:
The TPS7A8500RGRR is a 48-pin device, each pin of which serves a specific function. Below is a detailed table that lists each pin and its function:
Pin No. Pin Name Function Description 1 VIN Input voltage pin. This pin is used to supply Power to the voltage regulator. The input voltage range is typically from 3.0 V to 36 V. 2 PGND Power Ground pin. This is the ground pin for the power section of the device. 3 VOUT Output voltage pin. This pin supplies the regulated voltage to the load. 4 AGND Analog Ground pin. Used for the analog ground connection, separate from the power ground. 5 EN Enable pin. When high, the device is enabled, and when low, the device is disabled. 6 SDO Shutdown output. This pin indicates when the device is in shutdown mode (low indicates shutdown). 7 FB1 Feedback pin for the first stage of regulation. It senses the output voltage for feedback control. 8 FB2 Feedback pin for the second stage of regulation (if applicable). 9 SS1 Soft-Start pin for the first regulation stage. This pin controls the ramp-up of the output voltage. 10 SS2 Soft-Start pin for the second stage of regulation (if applicable). 11 RT Resistor connection for the Timing resistor to set the operation of the regulator. 12 VC Voltage Control pin for the regulator's internal control loop. 13 VD Pin for the internal digital supply voltage, often used for internal logic circuits. 14 NC No connection. Reserved for internal use or unused. 15 PGOOD Power Good output. This pin indicates the operational status of the voltage regulator. 16 VOUT2 Second output voltage pin (if applicable). 17 VOUT3 Third output voltage pin (if applicable). 18 VIN2 Second input voltage pin (if applicable). 19 PGND2 Second power ground pin (if applicable). 20 GND General ground pin for the device. 21 VOUT4 Fourth output voltage pin (if applicable). 22 VOUT5 Fifth output voltage pin (if applicable). 23 PWRGOOD Power-good pin. This pin indicates the health of the voltage regulator. 24 VOUT6 Sixth output voltage pin (if applicable). 25 COUT External capacitor connection for output smoothing. 26 CIN External capacitor connection for input smoothing. 27 NC No connection. 28 VOUT7 Seventh output voltage pin (if applicable). 29 VOUT8 Eighth output voltage pin (if applicable). 30 VOUT9 Ninth output voltage pin (if applicable). 31 VOUT10 Tenth output voltage pin (if applicable). 32 SENSE Voltage sensing pin for feedback. 33 FB3 Feedback pin for the third regulation stage (if applicable). 34 FB4 Feedback pin for the fourth regulation stage (if applicable). 35 SS3 Soft-Start pin for the third regulation stage (if applicable). 36 SS4 Soft-Start pin for the fourth regulation stage (if applicable). 37 NC No connection. 38 RT2 Timing resistor pin for the second regulation stage (if applicable). 39 PGND3 Power ground pin for the third stage of regulation (if applicable). 40 VOUT11 Eleventh output voltage pin (if applicable). 41 VOUT12 Twelfth output voltage pin (if applicable). 42 VOUT13 Thirteenth output voltage pin (if applicable). 43 VOUT14 Fourteenth output voltage pin (if applicable). 44 VOUT15 Fifteenth output voltage pin (if applicable). 45 VOUT16 Sixteenth output voltage pin (if applicable). 46 SENSE2 Second voltage sensing pin for feedback (if applicable). 47 VOUT17 Seventeenth output voltage pin (if applicable). 48 VOUT18 Eighteenth output voltage pin (if applicable).Circuit Principle:
The TPS7A8500RGRR is based on a linear voltage regulator design. It takes an input voltage (VIN) and produces a regulated output voltage (VOUT) with low noise and high accuracy. The feedback mechanism monitors the output voltage and ensures that it stays within the specified range by adjusting the internal control loop. The soft-start feature ensures a gradual increase in output voltage to prevent inrush current. The enable pin (EN) allows the device to be turned on or off, while the PGOOD pin provides feedback to indicate whether the device is operating within specifications.20 Common FAQ for TPS7A8500RGRR:
1. What is the input voltage range for the TPS7A8500RGRR? The input voltage range is from 3.0 V to 36 V.
2. What type of output voltage does the TPS7A8500RGRR provide? It provides a regulated output voltage, which is user-configurable, typically low-noise and precise.
3. How does the soft-start feature work in the TPS7A8500RGRR? The soft-start feature gradually ramps up the output voltage to prevent inrush current at startup.
4. What is the function of the PGOOD pin? The PGOOD pin indicates the operational status of the device. It outputs a high signal when the regulator is functioning properly.
5. Can the TPS7A8500RGRR be used in a 36 V application? Yes, the TPS7A8500RGRR can handle input voltages up to 36 V.
6. How do I enable the TPS7A8500RGRR? You can enable the device by setting the EN pin high.
7. What is the maximum output current that the TPS7A8500RGRR can supply? The device can supply up to 2 A of continuous output current, depending on the thermal and other design considerations.
8. What should I connect to the FB1 pin? The FB1 pin is used to sense the output voltage. It should be connected to a resistor divider network to set the desired output voltage.
9. What is the purpose of the SS pin? The SS pin is used to control the soft-start behavior of the device by connecting an external capacitor.
10. What is the significance of the AGND pin? The AGND pin is the analog ground and should be connected separately from the power ground for optimal performance.
11. What is the recommended output capacitor for the TPS7A8500RGRR? The recommended output capacitor is typically 10 µF to ensure stable operation.
12. How do I monitor the output voltage with the feedback pins? You can use the FB1, FB2, etc., pins for voltage sensing by connecting a resistor divider to the output.
13. What happens if the input voltage is below the recommended range? If the input voltage is too low, the device may not be able to regulate the output voltage correctly.
14. What is the typical dropout voltage of the TPS7A8500RGRR? The dropout voltage depends on the load current and output voltage, typically in the range of 0.3 V to 1.0 V.
15. How does the TPS7A8500RGRR handle thermal shutdown? The device has a built-in thermal shutdown feature that will disable the regulator if the temperature exceeds safe operating limits.
16. Can the TPS7A8500RGRR regulate multiple output voltages? Yes, it can regulate multiple output voltages, each with its own feedback and control loop.
17. What is the function of the NC pins? The NC pins are no-connect pins and are typically reserved for internal use.
18. What is the power-good delay time? The power-good delay time is the time it takes for the PGOOD pin to indicate that the output is stable after power is applied.
19. Can I use the TPS7A8500RGRR in battery-powered applications? Yes, it can be used in battery-powered applications within the input voltage range.
20. How do I calculate the output voltage for the TPS7A8500RGRR? The output voltage can be calculated using the feedback resistor network, based on the voltage set point.
