TPS74701DRCR Detailed explanation of pin function specifications and circuit principle instructions
The model "TPS74701DRCR" belongs to Texas Instruments (TI). This part is a low-dropout regulator (LDO), specifically designed for efficient voltage regulation. It comes in a QFN-16 package, which means it has 16 pins. Below is a detailed explanation of each pin function, the circuit principle, and the 20 common FAQs related to this part.
Pinout and Functionality (for QFN-16 package)
Pin No. Pin Name Function 1 IN Input voltage pin. This pin receives the input voltage that needs to be regulated. 2 GND Ground pin. This pin connects the ground of the system to the regulator. 3 EN Enable pin. This pin is used to enable or disable the regulator (active high). 4 VOUT Output voltage pin. This pin provides the regulated output voltage. 5 FB Feedback pin. This pin senses the output voltage for feedback regulation. 6 PGND Power ground pin. This pin serves as the reference ground for the power section. 7 C1+ capacitor connection for input filter (positive side). 8 C1- Capacitor connection for input filter (negative side). 9 C2+ Capacitor connection for output filter (positive side). 10 C2- Capacitor connection for output filter (negative side). 11 NC No connection pin. This pin is not internally connected. 12 NC No connection pin. This pin is not internally connected. 13 NC No connection pin. This pin is not internally connected. 14 NC No connection pin. This pin is not internally connected. 15 PG Power Good pin. This pin indicates whether the output voltage is within the specified range (active high). 16 VBIAS Bias voltage pin. This pin provides the bias voltage necessary for internal circuits.Circuit Principle Overview:
The TPS74701DRCR is a low dropout linear regulator that converts an input voltage into a lower output voltage with minimal voltage loss between input and output. It uses feedback to regulate the output voltage precisely. The regulator provides the ability to adjust the output voltage with an external feedback resistor, ensuring accuracy. The enable pin controls the activation of the regulator, while the power good pin provides feedback on the output voltage status.
Pin Function Specifications:
IN (Pin 1): Connects the unregulated input voltage (typically higher than the output voltage). Recommended voltage range: 2.5V to 6V. GND (Pin 2): Connects to the ground of the system. EN (Pin 3): Enable pin to turn the regulator on (logic high to enable). VOUT (Pin 4): Output voltage to the load. It is regulated by feedback from the FB pin. FB (Pin 5): A voltage divider connects this pin to the output, allowing the regulator to monitor and adjust the output voltage. PGND (Pin 6): Provides a reference ground for the regulator's power circuits. C1+ (Pin 7) and C1- (Pin 8): Connections for input capacitors to improve stability and reduce noise. C2+ (Pin 9) and C2- (Pin 10): Connections for output capacitors to stabilize the output and reduce noise. NC Pins (Pin 11-14): These pins are not connected to the internal circuitry. They are used for mechanical support in the QFN package. PG (Pin 15): Power good indicator, a high signal means the output voltage is within specification. VBIAS (Pin 16): Bias pin that provides the voltage necessary for internal circuit operation.20 FAQ - Common Questions:
What is the input voltage range of the TPS74701DRCR? The input voltage range for the TPS74701DRCR is 2.5V to 6V. How do I enable the TPS74701DRCR? To enable the TPS74701DRCR, drive the EN (pin 3) high. What happens when the EN pin is low? When the EN pin is low, the regulator is disabled, and the output voltage is not provided. What is the function of the FB pin? The FB pin is used for feedback to regulate the output voltage. How should I connect capacitors to the TPS74701DRCR? Connect input capacitors between C1+ (pin 7) and C1- (pin 8), and output capacitors between C2+ (pin 9) and C2- (pin 10). What is the purpose of the PG pin? The PG pin is a power-good output that indicates whether the output voltage is within specification. What is the output voltage of the TPS74701DRCR? The output voltage is set using a voltage divider connected to the FB pin. The regulator provides a low dropout output voltage. What is the role of the VBIAS pin? The VBIAS pin supplies bias voltage to the internal circuits of the regulator. What is the purpose of the GND pin? The GND pin serves as the reference ground for the entire system. How do I calculate the output voltage of the TPS74701DRCR? The output voltage is determined by selecting appropriate resistors for the feedback network (connected to the FB pin). What is the typical output noise of the TPS74701DRCR? The typical output noise is very low, as the TPS74701DRCR is designed for low-noise operation. Can I use the TPS74701DRCR in battery-powered applications? Yes, the TPS74701DRCR is suitable for battery-powered applications due to its low dropout voltage. What is the dropout voltage of the TPS74701DRCR? The TPS74701DRCR has a typical dropout voltage of around 40mV at 1A of load current. Can I use the TPS74701DRCR with a capacitive load? Yes, the TPS74701DRCR can be used with capacitive loads, but the capacitor values must meet the regulator’s stability requirements. What happens if the output voltage is too high? If the output voltage exceeds the rated value, it could damage the load or the regulator. Is the TPS74701DRCR thermal protected? Yes, the TPS74701DRCR has built-in thermal shutdown protection to prevent damage from overheating. Can the TPS74701DRCR be used with a single input voltage? Yes, the TPS74701DRCR works with a single input voltage that is higher than the desired output voltage. How does the Power Good feature work? The PG pin indicates whether the output voltage is within the specified range, and is active high when the voltage is good. What is the maximum output current of the TPS74701DRCR? The TPS74701DRCR can deliver a maximum output current of 1A. Can I use the TPS74701DRCR in high-temperature environments? The TPS74701DRCR has a wide operating temperature range, but excessive heat may trigger thermal protection. It is recommended to use proper heat management.Let me know if you'd like to explore more about the detailed functions or a specific application!