UC3625QG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High-performance voltage mode PWM controller
• Package: QFN-16
• Essence: Regulates and controls power supply voltages efficiently
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Input Voltage Range: 4.5V to 15V
• Output Voltage Range: 0.8V to 5.5V
• Operating Temperature Range: -40°C to 85°C
• Switching Frequency: 100kHz to 1MHz
• Maximum Duty Cycle: 90%
• Quiescent Current: 2mA

Detailed Pin Configuration

The UC3625QG4 has a total of 16 pins, each serving a specific function:

1. VCC: Power supply input
2. GND: Ground reference
3. COMP: Error amplifier output
4. FB: Feedback input for regulating the output voltage
5. CS: Current sense input
6. SS/TR: Soft-start/Shutdown control input
7. RT/CT: Oscillator timing components connection
8. SYNC: Synchronization input for multiple devices
9. DRVH: High-side MOSFET gate driver output
10. DRVL: Low-side MOSFET gate driver output
11. HO: High-side MOSFET bootstrap diode output
12. LO: Low-side MOSFET bootstrap diode output
13. VREF: Reference voltage output
14. UVLO: Undervoltage lockout input
15. OVP: Overvoltage protection input
16. EN: Enable control input

Functional Features

• High-performance voltage mode PWM controller
• Wide input voltage range for versatile applications
• Adjustable output voltage for flexibility
• Precise regulation and control of power supply voltages
• Soft-start and shutdown control for smooth operation
• Synchronization capability for multiple devices

Advantages and Disadvantages

Advantages

• High-performance and efficient power management
• Wide input voltage range allows compatibility with various power sources
• Adjustable output voltage provides flexibility in different applications
• Precise regulation ensures stable power supply voltages
• Soft-start feature prevents sudden voltage surges during startup
• Synchronization capability enables parallel operation of multiple devices

Disadvantages

• Limited maximum duty cycle may restrict certain applications
• Quiescent current of 2mA may not be suitable for ultra-low power designs

Working Principles

The UC3625QG4 operates as a voltage mode PWM controller, regulating the output voltage based on feedback from the FB pin. It compares the feedback voltage with a reference voltage to generate an error signal. This error signal is then amplified and used to control the duty cycle of the PWM signal, which drives the power MOSFETs. By adjusting the duty cycle, the controller maintains the desired output voltage.

Detailed Application Field Plans

The UC3625QG4 is commonly used in various power management applications, including:

1. Switching Power Supplies
2. DC-DC Converters
3. Battery Chargers
4. LED Drivers
5. Industrial Control Systems

Detailed and Complete Alternative Models

1. UC3825: Similar functionality, but with higher operating temperature range (-40°C to 125°C)
2. UC3845: Enhanced version with additional features like adjustable dead-time control
3. UC2854: Specifically designed for offline flyback converters
4. UC2842: Low-power variant suitable for battery-powered applications

These alternative models offer similar functionality to the UC3625QG4, catering to different temperature ranges, additional features, and specific application requirements.

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