AP2138N-1.2TRG1

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AP2138N-1.2TRG1 is an adjustable linear regulator for 3A low dropout (LDO) applications. It is typically used as a voltageregulator for MP3 players, PDAs and other consumer applications.

The AP2138N-1.2TRG1 LDO voltage regulators offer wide supply voltage range, very low dropout voltage, and low groundcurrent, making them ideal for low current, and low dropout applications. The LDO is designed to provide a steady output currentof up to 3A, and features a programmable over-current protection and thermal shutdown. The voltage source can be adjustedby setting drain current using an external resistor.

AP2138N-1.2TRG1 linear regulators feature a wide operating temperature range of -40℃ to +85℃, making them suitable forapplications that require higher temperature operation. The device is also characterized for operation from a 1V input supplyunder quiescent conditions, providing an ideal solution for power supplies with low voltage requirements.

Working Principle

The AP2138N-1.2TRG1 is a linear voltage regulator. It is designed to reduce the output voltage of a supplied device toa desired level. This is achieved by allowing current to flow through the device and regulating the voltage across thedevice. AP2138N-1.2TRG1 comprises of two transistors in series, which conduct current at a constant voltage drop. When the inputvoltage is greater than the output voltage set by the user, an internal comparator triggers, and the second transistorincreases the voltage drop across the device so as to reduce the output voltage. As the output voltage is reduced, the energyrequired to maintain the output voltage is reduced and the efficiency increases.

In addition to the voltage regulator, the AP2138N-1.2TRG1 also includes other protection features such as over-current protection and thermal protection. The over-current protection is activated when the load current exceeds the rated maximum for a specified period of time. This will shut down the device and hence the output voltage from the device. The thermal protection is activated when the temperature of the device exceeds the specified temperature range. The device will then shut down for safety.

Application Field

The AP2138N-1.2TRG1 adjustable linear regulator is suitable for a wide range of applications, including:

• Battery Chargers
• Low Dropout Linear Regulators
• Portable Electronics
• Instrumentation
• Wireless Applications
• Automotive Electronics

The AP2138N-1.2TRG1 adjustable linear regulator is ideal for applications requiring high precision voltage regulation, low quiescent current, and wide supply voltage. The device’s high efficiency makes it ideal for portable electronics such as cellular phones, MP3 players and other consumer applications.

The AP2138N-1.2TRG1 adjustable linear regulator is an ideal solution for a variety of automotive electronics applications including: fuel injection, engine control, and vehicle monitoring systems.

In addition, the AP2138N-1.2TRG1 adjustable linear regulator can be used in a wide range of industrial applications requiring precision voltage control. Such applications include process control, instrumentation, and data communication systems.

The AP2138N-1.2TRG1 adjustable linear regulator is an ideal voltage source for application requiring accurate, low noise and low power operation. The device is designed to provide low noise output and minimally affected by input changes due to its excellent transient response characteristics.

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