LT1109CN8-5#PBF

Product Overview

Category

The LT1109CN8-5#PBF belongs to the category of integrated circuits (ICs) and specifically falls under the voltage regulators subcategory.

Use

This product is primarily used for voltage regulation in electronic devices and systems. It ensures a stable output voltage regardless of input voltage fluctuations.

Characteristics

• Input Voltage Range: 2.5V to 18V
• Output Voltage: 5V
• Output Current: Up to 100mA
• Low Dropout Voltage: 300mV at 100mA
• Low Quiescent Current: 50µA
• Package Type: 8-pin PDIP (Plastic Dual In-Line Package)
• Operating Temperature Range: -40°C to 85°C

Packaging/Quantity

The LT1109CN8-5#PBF is typically packaged in a tube or reel format, containing 98 units per tube/reel.

Specifications

• Input Voltage Range: 2.5V to 18V
• Output Voltage: 5V ±4%
• Output Current: Up to 100mA
• Dropout Voltage: 300mV at 100mA
• Quiescent Current: 50µA
• Line Regulation: 0.04%/V
• Load Regulation: 0.1%/mA
• Ripple Rejection: 70dB
• Shutdown Current: 0.01µA
• Thermal Resistance: 160°C/W

Detailed Pin Configuration

The LT1109CN8-5#PBF has eight pins arranged as follows:

```

---

| | --| Vout |-- --| GND |-- --| Vin |-- --| SHDN |-- --| FB |-- --| NC |-- |_______| ```

1. Vout: Output Voltage Pin
2. GND: Ground Pin
3. Vin: Input Voltage Pin
4. SHDN: Shutdown Pin (Active Low)
5. FB: Feedback Pin
6. NC: No Connection

Functional Features

• Wide input voltage range allows for versatile applications.
• Low dropout voltage ensures efficient regulation even with low input-output differentials.
• Low quiescent current minimizes power consumption in standby mode.
• Shutdown pin enables easy on/off control of the regulator.
• Good line and load regulation provide stable output under varying conditions.
• High ripple rejection reduces noise interference.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows compatibility with various power sources.
• Low dropout voltage ensures efficient operation even with low battery voltages.
• Compact package size facilitates integration into space-constrained designs.
• Shutdown pin provides convenient control over power consumption.
• Good line and load regulation ensure stable output performance.

Disadvantages

• Limited output current capability may not be suitable for high-power applications.
• Thermal resistance may require additional heat dissipation measures in certain scenarios.

Working Principles

The LT1109CN8-5#PBF operates as a linear voltage regulator. It uses a feedback mechanism to maintain a constant output voltage regardless of changes in the input voltage or load conditions. The internal circuitry compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to regulate the output.

Detailed Application Field Plans

The LT1109CN8-5#PBF finds application in various electronic devices and systems, including but not limited to: - Battery-powered devices - Portable audio players - Embedded systems - Automotive electronics - Industrial control systems - Medical equipment

Detailed and Complete Alternative Models

• LM1117-5.0: A popular alternative with similar specifications and pin configuration.
• LT1763-5: Offers higher output current capability and lower dropout voltage.
• LM7805: A widely used linear regulator with a fixed 5V output.

These alternative models provide similar functionality and can be considered based on specific requirements and availability.

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