LM21305SQ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM21305SQ/NOPB is a synchronous step-down DC/DC converter from Texas Instruments, designed for high-efficiency power management in compact applications. It integrates two N-channel power MOSFETs and operates with an adjustable switching frequency ranging from 300 kHz to 1.5 MHz. The device delivers up to 5 A of output current with an adjustable output voltage range of 600 mV to 5 V. It features a wide input voltage range, supports external synchronization, and includes comprehensive protection mechanisms such as overcurrent, thermal, and soft-start functionality within a thermally enhanced WQFN-28 package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates two low RDS(on) N-channel power MOSFETs for high efficiency
• Supports adjustable switching frequencies from 300 kHz to 1.5 MHz
• Enables external clock synchronization for noise reduction
• Includes built-in overcurrent, thermal, and soft-start protections

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial point-of-load regulation
• Consumer electronics power supplies
• Infotainment systems
• Networking equipment

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix NOPB indicates lead-free status and RoHS compliance per Texas Instruments specifications. Confirm the WQFN-28 package variant matches design requirements. Ensure moisture sensitivity level handling procedures are followed during assembly. Cross-reference the datasheet revision date to confirm feature consistency. Validate that the operating temperature range meets system environmental constraints.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a 5 A buck regulator with integrated MOSFETs is required. Consider the adjustable frequency range for optimizing inductor size and transient response. Evaluate the WQFN-28 package for thermal performance and board space constraints. Verify input voltage compatibility with the source supply. Check if external synchronization is needed for system-wide noise management.

Voltage Regulators - DC DC Switching Regulators Part Context

The LM21305 belongs to the LM2130x family of synchronous buck converters. It shares architectural similarities with other devices in the series but offers specific current and packaging options. The SQ/NOPB designation identifies the specific pinout, temperature grade, and lead-free composition. This part serves as a direct replacement for older discrete solutions or lower-current regulators in similar form factors.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Check for LM21305 variants with different suffixes for minor parameter adjustments. Verify pin-to-pin compatibility with existing designs before substitution. Ensure thermal characteristics match the original component's heat dissipation capabilities.