Q1: What is the Diodes Inc AZ1117H-ADJTRG1?
A: The Diodes Inc AZ1117H-ADJTRG1 is a low-dropout linear voltage regulator (LDO) with an adjustable output voltage, capable of providing up to 1 A of continuous output current. It features a very low dropout voltage of typically 1.2 V at full load, high ripple rejection, low quiescent current, and built-in current limiting and thermal shutdown protection, making it suitable for a wide range of battery-powered and portable electronic applications where efficient power conversion from slightly higher input voltages is required.

Q2: What is the input voltage range of the Diodes Inc AZ1117H-ADJTRG1?
A: The Diodes Inc AZ1117H-ADJTRG1 supports an input voltage range from 3.0 V up to 15 V maximum, allowing it to regulate outputs from as low as 1.25 V up to approximately 13.8 V (depending on dropout and load conditions). This broad input capability makes it versatile for use with various power sources such as 5 V USB, 9 V batteries, 12 V automotive rails, or higher-voltage adapters while maintaining stable regulation.

Q3: What is the adjustable output voltage range of the Diodes Inc AZ1117H-ADJTRG1?
A: The Diodes Inc AZ1117H-ADJTRG1 features an adjustable output voltage that can be set anywhere from 1.25 V minimum up to a maximum of about 13.8 V by using an external resistor divider network connected to the ADJ pin. The internal reference voltage is precisely trimmed to 1.25 V, ensuring accurate and stable output setting with standard 1% tolerance resistors.

Q4: What package does the Diodes Inc AZ1117H-ADJTRG1 use?
A: The Diodes Inc AZ1117H-ADJTRG1 is housed in a compact SOT-223 surface-mount package with four pins (including tab), offering excellent thermal performance thanks to the large heat-dissipating tab that is electrically connected to the output. This package is popular for medium-power applications where space is limited but heat sinking through the PCB is feasible.

Q5: What is the dropout voltage performance of the Diodes Inc AZ1117H-ADJTRG1?
A: The Diodes Inc AZ1117H-ADJTRG1 exhibits a typical dropout voltage of only 1.2 V at 1 A load current, dropping to around 1.1 V at lighter loads. This low dropout characteristic allows efficient regulation even when the input voltage is only slightly above the desired output, helping to maximize battery life and reduce power dissipation in portable designs.

Q6: What is the maximum output current capability of the Diodes Inc AZ1117H-ADJTRG1?
A: The Diodes Inc AZ1117H-ADJTRG1 is rated to deliver a continuous output current of up to 1 A under proper thermal conditions. It includes internal current limiting that activates above approximately 1.1–1.5 A to protect the device and downstream circuitry during overload or short-circuit events.

Q7: How is the output voltage set on the Diodes Inc AZ1117H-ADJTRG1?
A: The output voltage of the Diodes Inc AZ1117H-ADJTRG1 is programmed using two external resistors forming a voltage divider between the output pin and ground, with the center tap connected to the ADJ pin. The formula is V_OUT = 1.25 V × (1 + R2/R1), where R1 is typically chosen between 100 Ω and 1 kΩ for good stability and noise performance.

Q8: What is the quiescent current of the Diodes Inc AZ1117H-ADJTRG1?
A: The Diodes Inc AZ1117H-ADJTRG1 has a very low ground current (quiescent current) of typically 5 mA at no load and up to about 10 mA at full load. This low power consumption makes it well-suited for battery-operated equipment and applications that remain powered in standby mode for extended periods.

Q9: Does the Diodes Inc AZ1117H-ADJTRG1 include thermal protection?
A: Yes, the Diodes Inc AZ1117H-ADJTRG1 incorporates built-in thermal shutdown protection that activates when the junction temperature exceeds approximately 150 °C, disabling the output to prevent damage. Once the temperature drops below the hysteresis threshold, the regulator automatically resumes normal operation.

Q10: What is the line regulation performance of the Diodes Inc AZ1117H-ADJTRG1?
A: The Diodes Inc AZ1117H-ADJTRG1 provides excellent line regulation of typically 0.05% and a maximum of 0.2% over its full input voltage range. This high performance ensures that output voltage remains stable despite fluctuations or noise on the input supply rail.

Q11: What load regulation does the Diodes Inc AZ1117H-ADJTRG1 achieve?
A: The Diodes Inc AZ1117H-ADJTRG1 offers good load regulation with a typical value of 0.1% and maximum of 0.3% when the load current changes from 10 mA to the full 1 A rating. This helps maintain a consistent output voltage across varying load conditions commonly found in digital and analog circuits.

Q12: How much output capacitance is recommended for the Diodes Inc AZ1117H-ADJTRG1?
A: The Diodes Inc AZ1117H-ADJTRG1 is stable with a minimum output capacitance of 22 µF (ceramic or tantalum) and performs best with values between 22 µF and 100 µF. Higher capacitance improves transient response and reduces output ripple, while low-ESR ceramics are preferred for optimal stability and noise performance.

Q13: What is the PSRR (ripple rejection) of the Diodes Inc AZ1117H-ADJTRG1?
A: The Diodes Inc AZ1117H-ADJTRG1 achieves a power supply ripple rejection ratio (PSRR) of typically 75 dB at 1 kHz and around 60 dB at 10 kHz, effectively attenuating input noise and ripple from switching supplies or other noisy sources before it reaches the regulated output.

Q14: Is the Diodes Inc AZ1117H-ADJTRG1 suitable for noise-sensitive applications?
A: Yes, the Diodes Inc AZ1117H-ADJTRG1 features low output noise (typically 40 µV RMS from 10 Hz to 100 kHz) and good transient response, making it a reliable choice for powering noise-sensitive analog circuits, RF modules, sensors, and precision data converters where clean power is essential.

Q15: What are the pin functions of the Diodes Inc AZ1117H-ADJTRG1 in the SOT-223 package?
A: In the SOT-223 package of the Diodes Inc AZ1117H-ADJTRG1, pin 1 is the ADJ pin for setting the output voltage, pin 2 is ground, pin 3 is the output voltage pin, and pin 4 (tab) is also the output and serves as the main heat dissipation path connected to the PCB copper area.

Q16: What is the operating temperature range of the Diodes Inc AZ1117H-ADJTRG1?
A: The Diodes Inc AZ1117H-ADJTRG1 is specified for operation over the industrial temperature range of -40 °C to +125 °C, ensuring reliable performance in automotive, industrial, and extended-temperature consumer applications.

Q17: Does the Diodes Inc AZ1117H-ADJTRG1 have over-current protection?
A: Yes, the Diodes Inc AZ1117H-ADJTRG1 includes internal current limiting circuitry that restricts output current during overload conditions, typically clamping between 1.1 A and 1.5 A to protect both the regulator and the load from excessive current draw or accidental shorts.

Q18: Can the Diodes Inc AZ1117H-ADJTRG1 be used in post-regulation after a switching converter?
A: Yes, the Diodes Inc AZ1117H-ADJTRG1 is frequently used as a post-regulator following a switching DC-DC converter to provide clean, low-noise power rails. Its excellent PSRR and low dropout make it ideal for cleaning up ripple and noise from buck or boost stages while adding minimal efficiency loss.

Q19: What is the typical output voltage accuracy of the Diodes Inc AZ1117H-ADJTRG1?
A: The Diodes Inc AZ1117H-ADJTRG1 maintains an output voltage accuracy of typically ±1% and maximum ±2% (including line, load, and temperature effects) when using precision external resistors, providing dependable regulation for most general-purpose and semi-precision applications.

Q20: What are common applications for the Diodes Inc AZ1117H-ADJTRG1?
A: The Diodes Inc AZ1117H-ADJTRG1 is widely used in battery-powered devices, USB-powered peripherals, instrumentation, industrial control systems, point-of-load regulation, microcontroller power supplies, audio circuits, LED drivers, and any application requiring a stable adjustable voltage up to 1 A with low dropout and good thermal characteristics in a small footprint.