The LM2672MX-5.0/NOPB is a voltage regulator integrated circuit (IC) manufactured by Texas Instruments. This IC belongs to the LM2672 series, which are DC-DC switching regulators. The "MX" suffix indicates a specific packaging type, while "NOPB" stands for "No Pb" (lead-free), indicating that the part is compliant with environmental standards such as RoHS.
1. Package and Pinout Overview:
The LM2672MX-5.0/NOPB comes in a DIP-8 (Dual In-line Package) or SO-8 package. It has 8 pins in total, each with specific functions.
Here’s the detailed breakdown of the 8 pins of the LM2672MX-5.0/NOPB:
Pin Number Pin Name Pin Function Description 1 Vin Input Voltage. Connect to the input power supply (typically +8V to +40V). 2 Vout Output Voltage. Connect to the output of the regulator. This pin provides the regulated voltage (5V for LM2672MX-5.0). 3 GND Ground. Connect to the system ground. 4 SW Switch Pin. This is connected to the external switch (typically a transistor or MOSFET) used in the switching regulator circuit. 5 Comp Compensation Pin. Used for external compensation to improve transient response. 6 Feedback (FB) Feedback Pin. Used to set the output voltage. It is connected to a voltage divider network to monitor the output voltage. 7 NC (No Connect) No Connection. This pin is not used in the circuit. It is left floating. 8 Enable (EN) Enable Pin. This pin controls the ON/OFF operation of the regulator. A logic high enables the device, and a logic low disables it.2. Circuit Principle:
The LM2672 is a step-down (buck) switching regulator. It efficiently converts a higher input voltage to a lower output voltage (in this case, 5V) using an internal switch and external components like inductors and capacitor s. The IC operates by switching the input voltage on and off rapidly, and using the inductor to smooth the current, providing a stable output voltage.
The switching frequency is typically around 260 kHz, and the output voltage is regulated through feedback from the FB pin. This feedback adjusts the duty cycle of the internal switch to maintain the desired output.
3. FAQ – Common Questions for LM2672MX-5.0/NOPB:
Q1: What is the input voltage range for LM2672MX-5.0/NOPB?A1: The input voltage range for the LM2672MX-5.0/NOPB is from 8V to 40V.
Q2: What is the output voltage of LM2672MX-5.0/NOPB?A2: The LM2672MX-5.0/NOPB provides a fixed output voltage of 5V.
Q3: What type of package is used for LM2672MX-5.0/NOPB?A3: The LM2672MX-5.0/NOPB comes in a DIP-8 or SO-8 package.
Q4: How many pins does the LM2672MX-5.0/NOPB have?A4: The LM2672MX-5.0/NOPB has 8 pins.
Q5: How do I calculate the output voltage of the LM2672MX-5.0/NOPB?A5: For LM2672MX-5.0/NOPB, the output voltage is fixed at 5V as specified.
Q6: What is the switching frequency of LM2672MX-5.0/NOPB?A6: The LM2672MX-5.0/NOPB operates at a switching frequency of approximately 260 kHz.
Q7: Can the LM2672MX-5.0/NOPB be used for higher current applications?A7: The LM2672MX-5.0/NOPB is rated for up to 500mA of output current. For higher current requirements, consider other regulators with higher current ratings.
Q8: How do I choose the inductor for the LM2672MX-5.0/NOPB?A8: The inductor should be chosen based on the desired output current and switching frequency. Typical values range from 10 µH to 100 µH.
Q9: What capacitors should be used with the LM2672MX-5.0/NOPB?A9: Typically, use a 100 µF electrolytic capacitor at the output and a 10 µF ceramic capacitor at the input.
Q10: What is the maximum input voltage for the LM2672MX-5.0/NOPB?A10: The maximum input voltage is 40V.
Q11: What is the output ripple for the LM2672MX-5.0/NOPB?A11: The output ripple is typically around 100 mV, depending on external components.
Q12: How do I disable the LM2672MX-5.0/NOPB?A12: To disable the LM2672MX-5.0/NOPB, pull the Enable (EN) pin low.
Q13: What is the thermal shutdown temperature for the LM2672MX-5.0/NOPB?A13: The thermal shutdown temperature is typically around 150°C.
Q14: Can the LM2672MX-5.0/NOPB be used in automotive applications?A14: Yes, the LM2672MX-5.0/NOPB can be used in automotive applications, as it operates with input voltages up to 40V, which is common in automotive power systems.
Q15: What is the efficiency of the LM2672MX-5.0/NOPB?A15: The efficiency of the LM2672MX-5.0/NOPB is typically around 80-90%, depending on the load current and external components.
Q16: How do I handle the ground pin of LM2672MX-5.0/NOPB?A16: Connect the Ground (GND) pin directly to the system ground to provide a common reference for all voltages.
Q17: What type of feedback is used in LM2672MX-5.0/NOPB?A17: The LM2672MX-5.0/NOPB uses voltage feedback via the Feedback (FB) pin to regulate the output voltage.
Q18: Can I use the LM2672MX-5.0/NOPB to step up voltages?A18: No, the LM2672MX-5.0/NOPB is a step-down (buck) converter, designed to reduce higher voltages to lower levels. It cannot be used for step-up applications.
Q19: What is the typical quiescent current for LM2672MX-5.0/NOPB?A19: The typical quiescent current for the LM2672MX-5.0/NOPB is around 6 mA.
Q20: How can I improve the transient response of LM2672MX-5.0/NOPB?A20: The transient response can be improved by selecting appropriate external compensation components for the Comp pin and ensuring proper layout practices to minimize noise.
This detailed explanation should provide you with all the necessary information for working with the LM2672MX-5.0/NOPB and addressing common concerns related to this component.