ADP151AUJZ-3.3-R7 Detailed explanation of pin function specifications and circuit principle instructions（245 ）

The part number " ADP151AUJZ-3.3 -R7" belongs to Analog Devices (AD). The ADP151 series is part of their family of low dropout (LDO) voltage regulators, specifically designed for applications requiring a stable and efficient power supply. The "-3.3" in the part number indicates that the output voltage of this LDO is 3.3V.

Here is the detailed pin function specification and circuit principle explanation for the ADP151AUJZ-3.3-R7 LDO voltage regulator.

Package Type and Pinout

The ADP151AUJZ-3.3-R7 comes in a 5-lead TSOT-23-5 package. This package contains 5 pins in total.

Pin Function List

Pin Number Pin Name Function Description 1 VOUT Output voltage pin – Provides a stable 3.3V output. Connect to the load circuit. 2 VIN Input voltage pin – Connects to the input power source. The recommended input range is typically between 2.3V and 6V. 3 GND Ground pin – This pin should be connected to the system ground. 4 ON/OFF Enable pin – Active-high to enable output; a low signal disables the output. 5 FB Feedback pin – This pin connects to a resistive divider to set the output voltage. For the ADP151-3.3 version, the feedback voltage is 3.3V.

Circuit Principle Overview

The ADP151AUJZ-3.3-R7 is a low dropout regulator designed to provide a stable 3.3V output voltage. When the input voltage is higher than the output voltage (by a small margin, typically around 100mV to 200mV), the regulator ensures that the output remains stable, even if the input voltage approaches the output level.

The VOUT pin provides the regulated output voltage to the system or load. The VIN pin is connected to the input power, typically ranging between 2.3V and 6V, which is regulated down to the output value. The GND pin is connected to the common ground of the circuit. The ON/OFF pin is used to control the activation of the regulator. When a high voltage (typically 2.3V or above) is applied to this pin, the regulator turns on and starts supplying the regulated output. The FB pin is part of the feedback loop that ensures the regulator maintains a constant 3.3V output by adjusting the internal reference voltage.

Common FAQs for ADP151AUJZ-3.3-R7

Here is a list of 20 frequently asked questions (FAQs) regarding the ADP151AUJZ-3.3-R7.

1. Q: What is the output voltage of ADP151AUJZ-3.3-R7? A: The ADP151AUJZ-3.3-R7 provides a regulated 3.3V output voltage.

2. Q: What is the input voltage range for the ADP151AUJZ-3.3-R7? A: The input voltage range for this part is typically between 2.3V and 6V.

3. Q: Can the ADP151AUJZ-3.3-R7 be used with higher input voltages? A: No, the input voltage must remain between 2.3V and 6V to ensure proper regulation.

4. Q: How does the ADP151AUJZ-3.3-R7 maintain a stable output voltage? A: It uses a low dropout regulator design that ensures the output voltage remains stable as long as the input is only slightly higher than the output.

5. Q: What type of capacitor is recommended for the output pin (VOUT)? A: It is recommended to use a 1µF or higher ceramic capacitor at the output to ensure stability.

6. Q: What is the purpose of the ON/OFF pin? A: The ON/OFF pin is used to enable or disable the output voltage. A high signal enables the output, while a low signal disables it.

7. Q: What is the recommended capacitance for the input capacitor (VIN)? A: A 1µF or higher ceramic capacitor is recommended for the input to improve stability and filter noise.

8. Q: What is the dropout voltage of the ADP151AUJZ-3.3-R7? A: The dropout voltage is typically around 40mV, meaning the input voltage can be as low as 3.34V to maintain 3.3V output.

9. Q: Can the ADP151AUJZ-3.3-R7 provide more than 3.3V output? A: No, this specific model is fixed to provide 3.3V output. For different output voltages, another model from the ADP151 series would be needed.

10. Q: What is the current capacity of the ADP151AUJZ-3.3-R7? A: The ADP151AUJZ-3.3-R7 can supply up to 150mA of output current.

11. Q: What is the feedback voltage at the FB pin? A: The feedback voltage at the FB pin is 3.3V for this particular version.

12. Q: How should I connect the feedback pin to set the output voltage? A: The feedback pin should be connected to a resistive voltage divider to set the desired output voltage. In this case, it is already configured for 3.3V.

13. Q: Is the ADP151AUJZ-3.3-R7 suitable for battery-powered applications? A: Yes, the low dropout feature makes it ideal for battery-powered devices, as it can operate with minimal voltage difference between input and output.

14. Q: Does the ADP151AUJZ-3.3-R7 have thermal shutdown protection? A: Yes, it includes thermal shutdown protection to prevent damage from overheating.

15. Q: Can the ADP151AUJZ-3.3-R7 be used in high-frequency circuits? A: Yes, it is designed to work efficiently in a wide range of frequencies.

16. Q: What happens if I apply a voltage higher than 6V to the VIN pin? A: Applying a voltage higher than 6V may damage the device, so it is important to stay within the recommended input range.

17. Q: Is the ADP151AUJZ-3.3-R7 suitable for precision applications? A: Yes, this device is suitable for precision applications with a very low dropout voltage and stable output.

18. Q: What are the typical applications for the ADP151AUJZ-3.3-R7? A: Typical applications include portable devices, wireless communications, and low-power systems.

19. Q: What is the lead finish of the ADP151AUJZ-3.3-R7? A: The leads of the ADP151AUJZ-3.3-R7 are finished with a matte tin plating, which is lead-free and RoHS compliant.

20. Q: How can I disable the output of the ADP151AUJZ-3.3-R7? A: You can disable the output by pulling the ON/OFF pin low (0V).

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