LM3638A0RDYFDR

LED Driver IC Overview

The LM3638A0RDYFDR is a high-efficiency step-up DC-DC converter manufactured by Texas Instruments, designed for driving multiple white LEDs in portable electronic devices. It operates with an input voltage range of 2.7V to 5.5V and supports up to four series-connected LEDs. The device integrates a 1.2MHz switching frequency to allow the use of small external components. Key electrical parameters include a maximum output current capability suitable for LED arrays, a shutdown supply current of less than 1µA, and an adjustable soft-start time to limit inrush current. It features cycle-by-cycle current limiting and thermal shutdown protection. The component is housed in a 6-pin SOT-23 package (DYF) and is rated for operation over an extended temperature range from -40°C to +85°C.

LED Driver IC Feature Summary

• Integrated high-efficiency boost converter optimized for multi-LED applications
• Ultra-low shutdown current for extended battery life in portable devices
• Built-in protections including thermal shutdown and cycle-by-cycle current limit
• Compact SOT-23 packaging facilitates space-constrained PCB layouts

LED Driver IC Applications

• Mobile phone flash LED drivers
• Portable media player backlighting systems
• Handheld gaming device illumination
• Digital camera accessory lighting

LED Driver IC Procurement Notes

Verify the specific suffix '0' in the part number LMR3638A0RDYFDR against the official Texas Instruments datasheet to confirm the fixed output configuration or trim version. Ensure the ordering code matches the tape-and-reel quantity specified in the manufacturer's documentation. Confirm RoHS compliance status and lead-free marking requirements prior to procurement to meet regulatory standards for the target assembly process.

LED Driver IC Selection Notes

Select this component when designing LED driver circuits requiring a compact solution with minimal external component count. Consider the input voltage range relative to the battery type used in the application. Evaluate the thermal performance within the SOT-23 package based on the expected LED current and ambient conditions. Verify that the required number of series LEDs falls within the converter's maximum output voltage capability to ensure stable regulation and efficiency.

LED Driver IC Part Context

The LM3638A belongs to Texas Instruments' family of single-cell Li-ion boost converters specifically engineered for LED illumination. This series is characterized by its ability to drive multiple LEDs from a single cell source while maintaining high efficiency across varying load conditions. The LM3638A variant typically includes integrated switches and control logic, distinguishing it from discrete solutions by offering a simplified design path for consumer electronics manufacturers focusing on size and power optimization.

LED Driver IC Replacement Considerations

Consult the Texas Instruments product selection guide for direct pin-compatible alternatives within the LM3638 series or the broader TPS610xx family. Verify that any substitute part maintains the same SOT-23-6 footprint and electrical characteristics, particularly the maximum output voltage and current limits. Cross-reference the functional specifications to ensure compatibility with existing firmware controls if PWM dimming is utilized.