DS3991Z+T&R/PPV

Overview

The DS3991Z is a Constant Current CCFL controller IC designed for backlight applications. It operates within a supply voltage range of 4.5 V to 5.5 V and draws a supply current of 5 mA. The device generates an oscillation frequency between 40 kHz and 80 kHz to drive cold cathode fluorescent lamps. It supports external dimming control via a dedicated pin. The component is available in a 16-SOIC surface-mount package with a wide operating temperature range from -40°C to +85°C.

Feature Summary

• Integrated oscillator for direct CCFL driving
• External analog dimming capability
• Constant current regulation for stable brightness

Applications

• LCD panel backlighting systems
• Industrial display modules
• Medical equipment lighting

Procurement Notes

Verify the specific suffix (T&R, PP, or PPV) against the manufacturer datasheet to confirm packaging type and tape-and-reel specifications. Confirm RoHS compliance status and lead times directly with authorized distributors as availability may vary. Ensure the selected variant matches the required PCB footprint and handling constraints.

Selection Notes

Select this component when a dedicated constant current source for CCFLs is required. Verify that the input voltage aligns with the 4.5 V to 5.5 V operational window. Consider the thermal performance within the specified -40°C to +85°C range for the target enclosure environment.

Part Context

This part belongs to the Maxim Integrated CCFL controller family, now under Analog Devices. It serves as a specialized power management solution for replacing traditional ballasts in liquid crystal displays. The series provides integrated timing and current regulation functions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.