onsemi

UC3844BD1G  

DC DC Switching Controllers

UC3844BD1G Description

The UC3844BD1G from onsemi is a high-performance current-mode PWM controller designed for DC-DC switching power supply applications. This obsolete but robust IC features a transistor driver output with positive, isolation-capable configuration, supporting topologies like boost and flyback converters. Operating within a 10V to 36V supply range, it delivers switching frequencies up to 500kHz, making it suitable for high-efficiency power conversion. With a 48% maximum duty cycle and frequency control capabilities, it ensures precise regulation in demanding environments. The device is ROHS3 compliant and rated for 0°C to 70°C operating temperatures, packaged in an 8-SOIC surface-mount form factor.

UC3844BD1G Features

• Current-Mode PWM Control: Enhances loop response and simplifies compensation.
• Wide Input Voltage Range (10V–36V): Supports diverse power supply designs.
• High Switching Frequency (500kHz): Enables compact magnetics and faster transient response.
• Isolation-Capable Output: Ideal for isolated power topologies like flyback converters.
• 48% Max Duty Cycle: Optimized for discontinuous conduction mode (DCM) designs.
• Single Output with Frequency Control: Simplifies synchronization in systems.
• Surface-Mount 8-SOIC Package: Space-efficient for modern PCB layouts.
• RoHS3 Compliant & REACH Unaffected: Meets environmental and regulatory standards.

UC3844BD1G Applications

• Switch-Mode Power Supplies (SMPS): For industrial, telecom, and computing systems.
• DC-DC Converters: Boost/buck regulators in automotive and renewable energy systems.
• Isolated Power Modules: Flyback designs for medical or industrial isolation requirements.
• LED Drivers: High-efficiency constant-current supplies.
• Battery Chargers: Precision control in charging circuits.

Conclusion of UC3844BD1G

The UC3844BD1G remains a reliable choice for engineers needing a current-mode PWM controller with robust performance in high-frequency switching applications. Its isolation capability, wide voltage range, and compact package make it versatile for SMPS, converters, and isolated power systems. While marked obsolete, its design maturity ensures compatibility with legacy and niche applications requiring precise duty cycle control and efficiency. For modern alternatives, consider onsemi's updated PWM controllers, but the UC3844BD1G excels in cost-sensitive or proven-design scenarios.

UC3844BD1G Documents

Download datasheets and manufacturer documentation for UC3844BD1G

EOL :

Product Discontinuance Notification (PDF)      

PCN :

General Announcement - 2D Barcoding (PDF)       Temporary Suspension of ISO 9001 Certification for Hitachi Chemical Co., Ltd.       Product Change Notification (PDF)       Capacity expansion for SOIC08 Copper Wire Products into ASE Kunshan, China (PDF)