LTC1174IS8#PBF

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Low Dropout Voltage - Low Quiescent Current - Adjustable Output Voltage - Overcurrent Protection - Thermal Shutdown Protection

Package: 8-Pin SOIC (Small Outline Integrated Circuit)

Essence: The LTC1174IS8#PBF is a voltage regulator IC that provides a stable output voltage with low dropout voltage and low quiescent current. It is commonly used in various electronic devices to regulate the voltage supplied to sensitive components.

Packaging/Quantity: The LTC1174IS8#PBF is typically sold in reels or tubes, containing a quantity of 250 units per package.

Specifications

• Input Voltage Range: 2.5V to 10V
• Output Voltage Range: 1.25V to 9.75V
• Dropout Voltage: 300mV at 100mA Load Current
• Quiescent Current: 50µA
• Maximum Output Current: 500mA
• Operating Temperature Range: -40°C to 85°C

Pin Configuration

The LTC1174IS8#PBF has the following pin configuration:

```

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| | --| Vout Vin|-- --| GND EN |-- --| FB NC |-- |___________| ```

Pin Description: - Vout: Output Voltage - Vin: Input Voltage - GND: Ground - EN: Enable Pin - FB: Feedback Pin - NC: No Connection

Functional Features

1. Low Dropout Voltage: The LTC1174IS8#PBF exhibits a low dropout voltage, allowing it to regulate the output voltage even when the input voltage is close to the desired output voltage.

2. Low Quiescent Current: The IC has a low quiescent current, minimizing power consumption when the load is light or idle.

3. Adjustable Output Voltage: The output voltage can be adjusted within a specified range using external resistors, providing flexibility in various applications.

4. Overcurrent Protection: The LTC1174IS8#PBF incorporates overcurrent protection, safeguarding the circuit and load from excessive current flow.

5. Thermal Shutdown Protection: In case of excessive temperature, the IC activates thermal shutdown protection to prevent damage to the device.

Advantages and Disadvantages

Advantages: - Low dropout voltage ensures efficient voltage regulation. - Low quiescent current reduces power consumption. - Adjustable output voltage allows customization for different applications. - Overcurrent and thermal shutdown protection enhance reliability.

Disadvantages: - Limited maximum output current (500mA) may not be suitable for high-power applications. - Requires external components (resistors) for voltage adjustment.

Working Principles

The LTC1174IS8#PBF operates as a linear voltage regulator. It regulates the output voltage by maintaining a constant voltage difference (dropout voltage) between the input and output terminals. This is achieved by controlling the pass transistor's resistance based on feedback from the FB pin.

When the input voltage exceeds the desired output voltage, the pass transistor is regulated to maintain a constant output voltage. The EN pin enables or disables the regulator, allowing control over the output voltage.

Detailed Application Field Plans

The LTC1174IS8#PBF finds application in various electronic devices that require stable and regulated voltage supply. Some common application fields include:

1. Battery-Powered Devices: Portable electronic devices such as smartphones, tablets, and wearable devices benefit from the LTC1174IS8#PBF's low dropout voltage and low quiescent current, extending battery life.

2. Embedded Systems: Microcontrollers, sensors, and other components in embedded systems require stable voltage supply. The LTC1174IS8#PBF ensures reliable operation in such applications.

3. Communication Equipment: Wireless routers, modems, and communication devices often utilize the LTC1174IS8#PBF to maintain a stable voltage for efficient data transmission.

4. Automotive Electronics: The IC can be used in automotive applications where regulated voltage is crucial for various electronic systems, including infotainment, lighting, and control modules.

Detailed and Complete Alternative Models

1. LTC1763-3.3: Similar to LTC1174IS8#PBF, this IC offers a fixed output voltage of 3.3V with low dropout voltage and low quiescent current.

2. LM1117-ADJ: This adjustable voltage regulator provides similar features as the LTC1174IS8#PBF but comes in a different package (TO-220) and has a higher maximum output current.

3. LT1086CT-5: With a fixed output voltage