The part number " LMZ12003TZ-ADJ/NOPB " is a product manufactured by Texas Instruments. It is a Power module that provides a fully integrated solution for power conversion. The LMZ12003 is part of the Simple Switcher series of power modules, specifically designed for use in applications such as point-of-load power supplies, where ease of use and compact size are critical.
Package Type:
The LMZ12003TZ-ADJ/NOPB comes in a QFN-9 package (9-pin package).
Pin Function Specifications and Circuit Principle Instructions:
Here is a detailed breakdown of the pin functions, including a list of the 9 pins with their respective functions:
Pin Number Pin Name Pin Function Description 1 Vin Input Voltage – Connect the input voltage to this pin. The recommended operating input voltage range is from 4.5V to 36V. 2 Vout Output Voltage – This pin provides the regulated output voltage. The output voltage is set by external resistors (adjustable version). 3 PGND Power Ground – Connect this pin to the power ground in your application circuit. 4 Vfb Feedback Pin – This pin is used to sense the output voltage in the feedback loop. It should be connected to an external resistor divider. 5 GND Ground Pin – Connect this pin to the system ground. This pin provides the reference for the entire device. 6 Comp Compensation Pin – This pin is used to provide compensation for the feedback loop, which ensures stable operation. 7 On/Off On/Off Control – This pin is used to enable or disable the device. A logic high (typically 3.3V) will turn on the regulator, and a logic low (typically 0V) will turn it off. 8 SW Switching Node – This pin is the switching node between the high-side and low-side MOSFETs . It is where the switching occurs in the device. 9 PG Power Good – This pin outputs a signal that indicates whether the output voltage is within the proper range. It is typically a logic high when the output voltage is correct.Detailed Pin Usage and Circuit Design:
Input Voltage (Vin): The LMZ12003 can accept a wide input range from 4.5V to 36V, which is suitable for a variety of applications such as industrial, automotive, and communication systems. The input voltage must be provided to the Vin pin to drive the power module.
Output Voltage (Vout): The output voltage is typically configured with external resistors to provide a specific regulated output voltage. The Vout pin will supply the load with this regulated voltage.
Power Ground (PGND) and Ground (GND): Proper connection to ground is essential for the operation of the module. The PGND pin connects to the power ground of the system, while the GND pin connects to the signal ground.
Feedback (Vfb): The feedback pin is critical in ensuring that the output voltage remains regulated. By connecting a voltage divider from the output voltage to ground and feeding it back to this pin, the feedback loop is established. This ensures that the output voltage stays constant despite changes in load or input voltage.
Compensation (Comp): To ensure the feedback loop is stable, a capacitor or resistor can be connected to the Comp pin, which compensates the loop for optimal performance.
On/Off (On/Off): The On/Off pin allows for remote control of the module. By applying a logic high (e.g., 3.3V) to this pin, the regulator turns on. A logic low (e.g., 0V) turns it off, which is useful for power management in battery-powered systems.
Switching Node (SW): This pin is where the switching happens. The high-frequency switching operation of the internal MOSFETs occurs at this node, which connects to an external inductor.
Power Good (PG): The PG pin is an open-drain output that signals whether the output voltage is within the correct range. It can be used for signaling or as part of a system monitoring feature.
20 Frequently Asked Questions (FAQs) about LMZ12003TZ-ADJ/NOPB
Q: What is the input voltage range for the LMZ12003TZ-ADJ/NOPB? A: The input voltage range for the LMZ12003TZ-ADJ/NOPB is from 4.5V to 36V.
Q: Can the output voltage of the LMZ12003 be adjusted? A: Yes, the output voltage can be adjusted using external resistors connected to the feedback pin (Vfb).
Q: What is the maximum output current of the LMZ12003? A: The LMZ12003 can deliver up to 3A of output current.
Q: How can I turn the LMZ12003 on or off? A: You can control the LMZ12003 using the On/Off pin, applying a logic high to turn it on and a logic low to turn it off.
Q: What is the function of the Comp pin? A: The Comp pin is used for compensation to stabilize the feedback loop and optimize performance.
Q: Is the LMZ12003 suitable for automotive applications? A: Yes, the LMZ12003 is suitable for automotive applications, as it has a wide input voltage range and high efficiency.
Q: Can the LMZ12003 be used in high-power applications? A: While the LMZ12003 can deliver 3A of output current, for higher power applications, consider using a different module designed for higher current.
Q: What type of feedback resistors should be used with the LMZ12003? A: The feedback resistors should be chosen based on the desired output voltage and the specifications provided in the datasheet.
Q: What is the switching frequency of the LMZ12003? A: The switching frequency of the LMZ12003 is typically 1 MHz.
Q: What is the PG pin used for? A: The PG pin provides a signal indicating whether the output voltage is within the correct range.
Q: Can I use the LMZ12003 with a 5V input? A: Yes, the LMZ12003 can operate with a 5V input as long as it falls within the input voltage range (4.5V to 36V).
Q: How does the Vfb pin help regulate output voltage? A: The Vfb pin senses the output voltage through an external resistor divider, allowing the feedback loop to maintain a constant output voltage.
Q: Is thermal performance an issue with the LMZ12003? A: The LMZ12003 has good thermal performance but may require heat dissipation for high power applications.
Q: How do I choose an appropriate inductor for the LMZ12003? A: The inductor should be selected based on the output current and frequency requirements, with values recommended in the datasheet.
Q: Can the LMZ12003 be used in a low-power mode? A: Yes, the LMZ12003 can be turned off by applying a logic low to the On/Off pin.
Q: What is the power efficiency of the LMZ12003? A: The efficiency of the LMZ12003 can reach up to 90% depending on input and output conditions.
Q: What is the typical output voltage of the LMZ12003? A: The output voltage can be configured anywhere between 0.8V and 15V, depending on the external resistors.
Q: Can the LMZ12003 be used in portable applications? A: Yes, the LMZ12003 is well-suited for portable applications due to its small package and high efficiency.
Q: What should I do if the PG pin shows an incorrect signal? A: Check for issues with the output voltage regulation or components like the feedback resistor network.
Q: Can the LMZ12003 handle transient voltage spikes? A: Yes, the LMZ12003 is designed to handle brief voltage spikes within the specified input voltage range.
This completes the detailed specifications, pin functions, and FAQs for the LMZ12003TZ-ADJ/NOPB power module.