LT1129CQ-3.3

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LT1129CQ-3.3

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LDO Voltage Regulators LT1129 - Micropower Low Dropout Regulators with Shutdown

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Description

The LT1129CQ-3.3 is a fixed-output, low-dropout (LDO) linear voltage regulator designed to provide a stable 3.3V output with a maximum current capability of 700mA. It is known for its low dropout voltage of 0.5V at full load, making it efficient for applications requiring low power dissipation. The device offers excellent line and load regulation, typically 0.04% and 0.2% respectively, ensuring consistent performance across varying input voltages and loads.
Key features include a low quiescent current of around 50μA, which makes it suitable for battery-powered applications. It also includes protection features such as current limiting and thermal shutdown, safeguarding the device against overload and overheating conditions.
The LT1129CQ-3.3 is housed in a durable TO-220 package for easy mounting and effective heat dissipation. Its design is suitable for applications like microprocessor power supplies, battery-powered equipment, and other systems requiring efficient voltage regulation with minimal power loss.

Equivalent

The LT1129CQ-3.3 is a low-dropout (LDO) linear voltage regulator. Equivalent products from other manufacturers may include:
1. LM1117-3.3 by Texas Instruments - A popular LDO with similar output voltage.
2. AMS1117-3.3 by Advanced Monolithic Systems - Another commonly used 3.3V LDO regulator.
3. MIC5205-3.3 by Microchip Technology - Offers similar performance with low dropout voltage.
4. NCP1117-3.3 by ON Semiconductor - Provides similar functionality as a 3.3V regulator.
Ensure to check specific parameters like current output and dropout voltage for compatibility.

Features

The LT1129CQ-3.3 is a low-dropout (LDO) linear voltage regulator designed to provide a stable 3.3V output. Key features include:
1. Output Voltage: Fixed at 3.3V.
2. Low Dropout Voltage: Typically around 0.4V at full load, allowing efficient operation with minimal input-output voltage differential.
3. Output Current: Capable of delivering up to 700mA.
4. Low Quiescent Current: Typically 50µA, making it suitable for battery-operated devices.
5. Stability: Requires only a 3.3µF output capacitor for stability, simplifying the design process.
6. Line and Load Regulation: Offers superior line and load regulation for consistent performance.
7. Protection Features: Includes current limiting and thermal shutdown to prevent damage under fault conditions.
8. Package: Available in a TO-220-5 package for ease of use in various applications.
These features make the LT1129CQ-3.3 suitable for applications requiring efficient, low-noise voltage regulation with moderate current demands.

Pinout

The LT1129CQ-3.3 is a low dropout regulator (LDO) from Analog Devices, designed to provide a fixed 3.3V output. The LT1129CQ variant typically comes in a TO-263-5 package, which has 5 pins. The pin functions are generally as follows:
1. Input (VIN): Connects to the input voltage supply.
2. Ground (GND): The common ground for the input and output.
3. Output (VOUT): Provides the regulated output voltage of 3.3V.
4. Shutdown (SHDN): Used to enable or disable the regulator output.
5. Sense (SENSE): Used to improve load regulation by connecting to the load.
This arrangement allows the LT1129CQ-3.3 to deliver a stable 3.3V output with low dropout voltage, making it suitable for applications requiring efficient voltage regulation. Always refer to the manufacturer's datasheet for precise pin configuration and additional details.

Manufacturer

The LT1129CQ-3.3 is manufactured by Linear Technology Corporation. Linear Technology is a company that specializes in the design and manufacturing of analog integrated circuits. Their products are typically used in a wide range of applications including communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military systems. Linear Technology was known for its high-performance analog products that provided solutions for power management, data conversion, signal conditioning, RF, and wireless communications.
In 2017, Linear Technology was acquired by Analog Devices, Inc., a company that operates in a similar field and is known for its broad range of analog, mixed-signal, and digital signal processing (DSP) integrated circuits. This acquisition allowed Analog Devices to expand its portfolio and strengthen its position in the analog and power management business.

Application

The LT1129CQ-3.3 is a low dropout (LDO) linear voltage regulator. Its application areas include:
1. Power Supply Systems: Suitable for providing a stable 3.3V output in electronic devices.
2. Battery-Powered Equipment: Ideal for use in portable devices due to its low power consumption and efficiency.
3. Telecommunications: Used in modems, routers, and other communication devices requiring stable power.
4. Consumer Electronics: Common in devices such as smartphones, tablets, and other handheld gadgets.
5. Industrial Controls: Used in automation systems requiring reliable voltage regulation.
6. Computing Systems: Provides stable power to processors and memory components.
These applications leverage its low dropout voltage, thermal performance, and reliability.

Package

The LT1129CQ-3.3 is a low dropout (LDO) regulator and is typically available in a TO-263 package.

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