UC3903Q

Product Overview

Category: Integrated Circuit (IC)
Use: Voltage Regulator
Characteristics: High precision, low dropout voltage, adjustable output voltage
Package: Quad Flat Package (QFP)
Essence: The UC3903Q is a voltage regulator IC designed for various applications requiring stable and adjustable output voltages.
Packaging/Quantity: Available in tape and reel packaging, with 250 units per reel.

Specifications

Input Voltage Range: 2.7V to 15V
Output Voltage Range: 1.25V to 13.5V
Dropout Voltage: 0.4V at 100mA load current
Output Current: Up to 500mA
Line Regulation: ±0.02%/V
Load Regulation: ±0.05%/A
Quiescent Current: 75µA
Operating Temperature Range: -40°C to +85°C

Pin Configuration

The UC3903Q has a total of 16 pins arranged as follows:

```

| | | 1 16 | | | | 2 15 | | | | 3 14 | | | | 4 13 | | | | 5 12 | | | | 6 11 | | | | 7 10 | | | | 8 9 | |___________________| ```

Functional Features

Adjustable output voltage through external resistors
Low dropout voltage ensures efficient power conversion
Overcurrent and thermal protection
Fast transient response
Low quiescent current for power-saving applications

Advantages and Disadvantages

Advantages: - High precision voltage regulation - Wide input voltage range - Adjustable output voltage - Low dropout voltage - Overcurrent and thermal protection

Disadvantages: - Limited output current capacity (up to 500mA) - Requires external resistors for voltage adjustment

Working Principles

The UC3903Q is based on a linear voltage regulator architecture. It utilizes a feedback mechanism to maintain a stable output voltage regardless of variations in the input voltage or load conditions. The adjustable output voltage is achieved by connecting external resistors to the appropriate pins of the IC.

Application Field Plans

The UC3903Q finds applications in various fields, including but not limited to: 1. Battery-powered devices 2. Portable electronic equipment 3. Automotive electronics 4. Industrial control systems 5. Communication devices

Alternative Models

Here are some alternative models that can be considered as substitutes for the UC3903Q: 1. LM317T 2. LT1086 3. LM1117 4. ADP3339 5. MAX603

These alternatives offer similar functionality and characteristics, providing flexibility in choosing the most suitable voltage regulator for specific applications.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací UC3903Q v technických řešeních

Sure! Here are 10 common questions and answers related to the application of UC3903Q in technical solutions:

Question: What is UC3903Q?
- Answer: UC3903Q is a voltage mode PWM controller IC used for controlling power supply circuits.
Question: What are the key features of UC3903Q?
- Answer: The key features of UC3903Q include adjustable frequency, soft-start capability, overcurrent protection, and undervoltage lockout.
Question: How does UC3903Q control the power supply circuit?
- Answer: UC3903Q uses voltage mode control technique to regulate the output voltage of the power supply circuit.
Question: Can UC3903Q be used in both buck and boost converter configurations?
- Answer: Yes, UC3903Q can be used in both buck and boost converter configurations, making it versatile for various applications.
Question: What is the maximum operating frequency of UC3903Q?
- Answer: The maximum operating frequency of UC3903Q is typically around 500 kHz.
Question: Does UC3903Q have built-in protection features?
- Answer: Yes, UC3903Q has built-in overcurrent protection and undervoltage lockout features to ensure safe operation of the power supply circuit.
Question: Can UC3903Q be used in high-power applications?
- Answer: Yes, UC3903Q can be used in high-power applications as it supports a wide input voltage range and can handle high currents.
Question: Is UC3903Q suitable for battery-powered applications?
- Answer: Yes, UC3903Q is suitable for battery-powered applications as it has low quiescent current and can operate with low input voltages.
Question: Can UC3903Q be used in automotive applications?
- Answer: Yes, UC3903Q is suitable for automotive applications as it can handle the harsh operating conditions and has built-in protection features.
Question: Are there any application notes or reference designs available for UC3903Q?
- Answer: Yes, Texas Instruments provides application notes and reference designs for UC3903Q, which can help in implementing the IC in various technical solutions.

Please note that the answers provided here are general and may vary depending on specific design requirements and application scenarios. It is always recommended to refer to the datasheet and relevant documentation for accurate information.