The part number " TPS7A4700RGW R" belongs to Texas Instruments (TI), a leading brand in semiconductor components. This specific part is a low-dropout (LDO) regulator designed for high-pe RF ormance Power supplies, offering very low noise and high output precision, typically used in sensitive analog applications.
Package Information:
The "TPS7A4700RGWR" comes in the WQFN-20 package, which has 20 pins. A WQFN package refers to a Wide Quad Flat No-lead package, and in this case, it is a 20-pin configuration.
Pin Function List for the TPS7A4700RGWR (WQFN-20 package):
Below is the detailed description of the pin functions for the TPS7A4700RGWR in a 20-pin WQFN package. This will cover each of the 20 pins, with their functions and uses:
Pin Number Pin Name Pin Function Description 1 EN Enable input. Logic-high enables the device; logic-low disables it. 2 NC No connection. Pin is not internally connected. 3 OUT Output. Provides the regulated output voltage. 4 PGND Power ground. Connects to the power ground plane. 5 VIN Input voltage. Provides the input voltage to the regulator. 6 VOUT_CAP Output capacitor connection. Used to stabilize output. 7 FB Feedback input. Used for setting the output voltage (via external resistors). 8 NC No connection. Pin is not internally connected. 9 GND Ground. Connects to the ground plane of the circuit. 10 VOUT Output voltage sense pin. Provides feedback to maintain output voltage. 11 NC No connection. Pin is not internally connected. 12 PGND Power ground. Connects to the power ground plane. 13 VOUT_CAP Output capacitor connection. Used to stabilize output. 14 NC No connection. Pin is not internally connected. 15 EN Enable input. Logic-high enables the device; logic-low disables it. 16 VIN Input voltage. Provides the input voltage to the regulator. 17 FB Feedback input. Used for setting the output voltage (via external resistors). 18 PGND Power ground. Connects to the power ground plane. 19 NC No connection. Pin is not internally connected. 20 GND Ground. Connects to the ground plane of the circuit.Circuit Principle:
The TPS7A4700 operates as a low-dropout voltage regulator, which means it can provide a stable output voltage even when the input voltage is only slightly higher than the output voltage. The device features extremely low noise, which makes it ideal for noise-sensitive applications such as precision analog systems, audio circuits, and RF systems.
Feedback loop: The device uses a feedback mechanism, where the feedback pin (FB) is connected to a resistor divider network to set the output voltage. Capacitors : The device typically requires capacitors on both the input (VIN) and output (VOUT) for stable operation. Enable pin (EN): When the EN pin is driven high, the device is turned on, and when driven low, the regulator shuts off. Thermal shutdown and overcurrent protection: The TPS7A4700 includes features to protect the device under extreme conditions, such as thermal overload or excessive current.FAQ for TPS7A4700RGWR
Q: What is the input voltage range for TPS7A4700RGWR? A: The input voltage range for the TPS7A4700RGWR is from 1.4V to 6.5V.
Q: What is the output voltage range of the TPS7A4700RGWR? A: The output voltage of the TPS7A4700RGWR can be adjusted from 0.8V to 5.5V using external resistors.
Q: Can the TPS7A4700RGWR be used to power high-current applications? A: While the TPS7A4700RGWR is designed for low-noise, high-precision applications, it can provide up to 200mA of output current.
Q: How do you set the output voltage for TPS7A4700RGWR? A: The output voltage is set by selecting an appropriate resistor divider connected to the feedback (FB) pin.
Q: What is the quiescent current of the TPS7A4700RGWR? A: The quiescent current (IQ) is typically 25µA, which makes it suitable for low-power applications.
Q: Is there any thermal protection in TPS7A4700RGWR? A: Yes, the TPS7A4700RGWR includes thermal shutdown to protect against overheating.
Q: What is the typical dropout voltage of TPS7A4700RGWR? A: The typical dropout voltage is 40mV at 100µA output current, which is one of the lowest in its class.
Q: What is the output noise performance of TPS7A4700RGWR? A: The TPS7A4700RGWR has an ultra-low output noise of 0.25µVRMS (10Hz to 100kHz), making it ideal for sensitive analog circuits.
Q: Does the TPS7A4700RGWR have short-circuit protection? A: Yes, it includes short-circuit protection to avoid damage to the regulator and the connected load.
Q: What is the maximum output current for TPS7A4700RGWR? A: The TPS7A4700RGWR can provide a maximum output current of 200mA.
Q: Can the TPS7A4700RGWR be used in automotive applications? A: Yes, the TPS7A4700RGWR is suitable for automotive applications, as it has a wide operating temperature range and high reliability.
Q: What is the thermal shutdown threshold for TPS7A4700RGWR? A: The thermal shutdown threshold for the TPS7A4700RGWR is typically 160°C, with hysteresis of 20°C.
Q: What capacitors are recommended for the input and output? A: For stable operation, 10µF ceramic capacitors are typically recommended for both the input and output.
Q: How does the Enable (EN) pin work? A: When the EN pin is high, the regulator is enabled, and when it is low, the regulator is disabled, which reduces the current consumption to a minimum.
Q: Can the TPS7A4700RGWR operate at very low input voltages? A: Yes, the TPS7A4700RGWR is capable of regulating even when the input voltage is very close to the output voltage, thanks to its low dropout voltage.
Q: What is the maximum operating temperature of TPS7A4700RGWR? A: The maximum operating temperature for the TPS7A4700RGWR is 125°C.
Q: Is the TPS7A4700RGWR compatible with 5V logic signals? A: Yes, the EN pin is logic level compatible, allowing it to be controlled by 5V logic signals.
Q: What is the power supply rejection ratio (PSRR) of TPS7A4700RGWR? A: The TPS7A4700RGWR offers excellent PSRR, which is typically 60dB at 100kHz.
Q: Does the TPS7A4700RGWR have overcurrent protection? A: Yes, it includes overcurrent protection to prevent damage in case of excessive load current.
Q: How can I minimize noise when using TPS7A4700RGWR? A: To minimize noise, it is important to use low ESR capacitors, maintain a solid ground plane, and minimize the distance between the input/output capacitors and the device.
This explanation, including all pin functions and the FAQ, provides a comprehensive overview of the TPS7A4700RGWR device.