STLD40DPUR

Overview

The STLD40DPUR is a boost converter IC from the STMicroelectronics STLD40D series, designed for driving white LEDs in backlight applications. It operates from a DC input voltage range of 3.0 V to 5.5 V and provides an output voltage up to 37 V. The device regulates LED current at 20 mA using PFM control with discontinuous conduction mode (DCM). It features an internal boost switch with fixed minimum OFF time, PWM dimming capability via the enable pin, and adjustable peak inductor current. Packaged in an 8-QFN (3x3 mm) surface-mount format, it supports operation within a temperature range of -40°C to 85°C.

Feature Summary

• Inductor switch boost controller with PFM mode for high efficiency across wide input voltage ranges
• Integrated overvoltage protection with automatic restart and adjustable peak current limit
• Logic enable pin supporting low-frequency PWM dimming control and low shutdown current
• Compact QFN8 package requiring minimal external components

Applications

• White LED power supply for large display backlights
• LED illumination systems requiring series LED strings
• Portable electronic devices utilizing single-cell battery inputs

Procurement Notes

Verify the specific suffix 'PUR' corresponds to the tape-and-reel packaging configuration when ordering. Confirm that the component meets RoHS standards and halogen-free requirements as specified by the manufacturer. Ensure compatibility with the intended PCB footprint for the 8-QFN package. Cross-reference the datasheet revision to confirm electrical characteristics match the design requirements before finalizing procurement.

Selection Notes

Select this component for designs requiring a compact solution to drive multiple white LEDs in series from a single-cell lithium-ion or similar battery source. It is suitable where space constraints favor the small QFN8 package. Consider the 20 mA output current limit and 37 V maximum output voltage when determining the number of series LEDs. Verify that the application environment stays within the specified operating temperature range.

Part Context

This part belongs to the STLD40D series of inductor switch boost controllers from STMicroelectronics. These devices are specialized for LED lighting applications, offering integrated power switching and control logic. The series is characterized by its ability to operate efficiently with minimal external components, making it a common choice for portable display backlighting solutions.

Replacement Considerations

The STLD40DPMR is a related variant within the same family but is listed as discontinued. When evaluating substitutes, ensure the replacement maintains the 3.0 V to 5.5 V input range, 37 V output capability, and 8-QFN package compatibility.