UC3906QG3

Product Overview

• Category: Integrated Circuit
• Use: Battery Charger Controller
• Characteristics: High Efficiency, Fast Charging, Multiple Protection Features
• Package: QFN (Quad Flat No-Lead)
• Essence: Control and monitor the charging process of batteries
• Packaging/Quantity: Tape & Reel, 2500 units per reel

Specifications

• Input Voltage Range: 4.5V to 25V
• Output Voltage Range: 2V to 25V
• Maximum Charging Current: 1A
• Operating Temperature Range: -40°C to +85°C
• Package Dimensions: 4mm x 4mm

Detailed Pin Configuration

The UC3906QG3 has a total of 16 pins. The pin configuration is as follows:

1. VCC - Power supply voltage input
2. GND - Ground reference
3. BAT - Battery connection terminal
4. VREF - Reference voltage output
5. ISET - Charging current setting
6. VSENSE - Voltage sense input
7. TEMP - Temperature sense input
8. PROG - Programming resistor connection
9. STAT - Status indicator output
10. TIMER - Timer capacitor connection
11. CT - Timing capacitor connection
12. RT - Timing resistor connection
13. COMP - Error amplifier compensation
14. FB - Feedback voltage input
15. EN - Enable control input
16. OSC - Oscillator timing capacitor connection

Functional Features

• Constant Current and Constant Voltage Charging Modes
• Automatic Charge Termination
• Overvoltage and Overcurrent Protection
• Temperature Monitoring and Protection
• LED Indicators for Charging Status
• Programmable Charging Current

Advantages

• High charging efficiency
• Fast charging capability
• Comprehensive protection features
• Compact package size
• Easy to integrate into battery charger designs

Disadvantages

• Limited maximum charging current (1A)
• Restricted input and output voltage range

Working Principles

The UC3906QG3 is a battery charger controller IC that operates in two modes: constant current and constant voltage. In the constant current mode, it regulates the charging current to a predetermined value set by the ISET pin. Once the battery voltage reaches a certain threshold, it switches to the constant voltage mode, maintaining a steady voltage across the battery terminals.

The IC continuously monitors the battery voltage, temperature, and charging current to ensure safe and efficient charging. It provides protection against overvoltage, overcurrent, and overheating conditions, safeguarding both the battery and the charging circuitry.

Detailed Application Field Plans

The UC3906QG3 is widely used in various battery charging applications, including:

1. Portable Electronics: Mobile phones, tablets, laptops, and other portable devices.
2. Electric Vehicles: Battery charging systems for electric cars, bikes, and scooters.
3. Renewable Energy: Solar-powered battery charging systems for off-grid installations.
4. Industrial Equipment: Charging solutions for industrial batteries used in machinery and equipment.
5. Consumer Electronics: Battery chargers for cameras, gaming consoles, and audio devices.

Alternative Models

If the UC3906QG3 does not meet specific requirements, alternative models with similar functionality include:

1. UC3909: Higher charging current capability (up to 3A).
2. UC3907: Extended input and output voltage range (up to 40V).
3. UC3905: Lower cost option with basic charging features.

These alternative models can be considered based on the specific needs of the application.

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