MAX8740ETB

Overview

The MAX8740ETB is a high-performance step-up DC-DC converter designed to provide regulated supply voltages for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). It incorporates current-mode, fixed-frequency pulse-width modulation (PWM) circuitry with a built-in n-channel power MOSFET. The device operates within an input supply range of 2.6V to 5.5V and supports adjustable output voltages from the input level up to 28V. Key electrical characteristics include pin-programmable switching frequencies of 640kHz or 1.2MHz, typical efficiency of 90%, and a shutdown current of 0.1µA.

Feature Summary

• Integrates a high-efficiency n-channel power MOSFET with current-mode PWM control for fast transient response.
• Features programmable soft-start functionality to limit inrush current during startup.
• Includes input supply undervoltage lockout protection for reliable operation under low voltage conditions.

Applications

• Notebook computer display panels
• LCD monitor panel power supplies

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm package integrity and lead times prior to ordering. Ensure compliance with RoHS standards and environmental regulations applicable to your region. Check for end-of-life status or discontinuation notices before finalizing procurement plans.

Selection Notes

Select this component when designing power systems for TFT-LCD applications requiring efficient step-up conversion. Consider the 2.6V to 5.5V input range and up to 28V output capability. Evaluate the need for specific switching frequencies and ensure thermal management aligns with the 10-pin Thin DFN package constraints.

Part Context

The MAX8740 belongs to Maxim Integrated's portfolio of power management solutions for display technologies. It addresses the specific voltage requirements of active-matrix LCDs by combining control logic and power switching in a compact form factor. This integration reduces external component count and board space compared to discrete solutions.

Replacement Considerations

Consult official documentation for direct substitutes. Verify pin compatibility and electrical specifications if considering alternative part numbers from the same manufacturer family.