ML4825CQ

Power Supply Controllers, Monitors Overview

The ML4825CQ is a high-frequency PWM controller IC designed for switch-mode power supply applications. It operates in current-mode control with pulse width modulation, supporting frequencies up to 1MHz. The device features a bipolar process and is housed in a 20-pin plastic LCC package. It accepts an input voltage range of 8.8V to 30V, with a nominal rating of 15V. Key functional attributes include cycle-by-cycle current limiting via a 1V threshold comparator and soft-start capabilities initiated at a 1.4V threshold. The controller also provides input voltage feed-forward and can function in voltage mode.

Power Supply Controllers, Monitors Feature Summary

• Supports high-frequency operation up to 1MHz with minimal propagation delays for reliable switching performance.
• Features dual-mode capability, functioning in either current-mode or voltage-mode control configurations.
• Includes integrated cycle-by-cycle current limit protection triggered by a 1V threshold comparator.
• Provides input voltage feed-forward and utilizes a shared pin for maximum duty cycle control and soft-start initiation.

Power Supply Controllers, Monitors Applications

• Switch Mode Power Supply (SMPS) designs
• High-frequency power conversion circuits
• Industrial power management systems

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix 'CQ' against official Fairchild Semiconductor documentation to confirm package type and temperature grade. Ensure compliance with relevant export control classifications (ECCN EAR99) and environmental standards prior to procurement. Confirm availability status as legacy components may have limited supply chains.

Power Supply Controllers, Monitors Selection Notes

Select this component for designs requiring precise current-mode control at high switching frequencies. Evaluate the 20-pin LCC package constraints for PCB layout. Consider the bipolar process characteristics and input voltage range when matching power stage requirements. Verify thermal management needs for the specified operating temperature range.

Power Supply Controllers, Monitors Part Context

The ML4825 series represents a family of high-performance power supply controllers optimized for efficiency and reliability. Manufactured by Fairchild Semiconductor, these devices are engineered to minimize propagation delays while maximizing error amplifier bandwidth. The ML4825CQ specifically targets applications demanding robust control loops and flexible operating modes within compact form factors.

Power Supply Controllers, Monitors Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Consult manufacturer obsolescence notices for recommended alternatives if the component is discontinued.

Power Supply Controllers, Monitors FAQ

Can the ML4825CQ operate in voltage mode?

Yes, the ML4825CQ can function in either current-mode or voltage-mode control configurations.

What triggers the soft-start cycle?

Exceeding a 1.4V threshold on the soft-start pin initiates the soft-start cycle.