AZ1117CD-1.8TRG1

The AZ1117CD-1.8TRG1 is a low dropout, low noise linear regulator, ideal for applications that require low input noise, low output noise, low dropout and positive or negative output voltage applications. It offers excellent performance in a tiny SOT-23 package and can provide up to 1.8A of output current. The output voltage is adjustable, making the device suitable for a wide range of applications.

The AZ1117CD-1.8TRG1 is designed with a high efficiency P-channel MOSFET which is normally operated in linear mode, except during start-up where it is operated in burst mode to reduce start-up time. The device has a voltage reference, error amplifier and logic control circuitry to provide accurate and precise voltage regulation with no overshoot or undershoot. Additionally, a low part count and minimal external components are needed to achieve precise load regulation. The device is available in a SOT-23-5 package.

The device boasts a wide range of features including:

• Low dropout voltage of 150mV at 1.8A output current
• Wide input voltage range from 1.6V to 20V
• Output voltage adjustable from 0.8V to 30V with an external resistor divider
• Programmable current limit for short circuit protection
• Internal thermal shutdown protection with hysteresis
• External sense pin for excellent load regulation

The device is widely used in many applications including computers, event driven peripherals, electronic instruments, laser printers, copiers and exercise equipment. It is also suitable for high current applications such as BLDC motors and high current LED lighting.

The working principle of the AZ1117CD-1.8TRG1 is quite simple. It is an on-off type voltage regulator that uses a voltage reference to set the output voltage. When power is applied, the voltage reference and the error amplifier turn on the P-channel output MOSFET. The current limit circuit protects the device in the event of a short circuit. If the output voltage is too low, the error amplifier increases the gate voltage of the output MOSFET and the output voltage increases. If the output voltage is too high, the error amplifier decreases the gate voltage of the output MOSFET and the output voltage decreases. This allows the device to maintain a stable output voltage under various loading conditions.

In summary, the AZ1117CD-1.8TRG1 is a low dropout, low noise linear voltage regulator suitable for a wide range of applications. It offers excellent performance in a small form factor, and requires minimal external components for proper operation. The device is widely used in a variety of applications, ranging from computers and event-driven peripherals to laser printers and exercise equipment. The device’s working principle is quite straight forward, using a voltage reference and an error amplifier to maintain the output voltage.