LM2598S-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2598S-3.3/NOPB is a SIMPLE SWITCHER step-down switching regulator from Texas Instruments, originally associated with National Semiconductor. It operates with an input voltage range of 4.5V to 40V and provides a fixed 3.3V output at up to 1A. The device features a typical switching frequency of 173 kHz, enabling the use of compact external components. It is housed in a TO-263 (DDPAK-7) surface-mount package and supports an operating junction temperature range from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated monolithic buck converter topology for efficient DC-DC step-down conversion
• Fixed 3.3V output configuration eliminates external feedback resistor networks
• Internal high-frequency oscillator reduces required passive component size
• Thermal performance optimized for direct PCB heat dissipation via exposed pad

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems requiring 3.3V rails
• Input voltage reduction from higher bus voltages to low-voltage logic levels
• Battery-powered equipment requiring efficient step-down conversion
• Industrial control modules operating within wide input voltage ranges

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation carefully, as this part originates from National Semiconductor but is now distributed by Texas Instruments. Confirm the suffix /NOPB indicates lead-free and RoHS compliance. Ensure the package matches the TO-263 form factor required for your thermal design. Cross-reference the specific revision level if strict historical sourcing is necessary for legacy systems.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required without external programming resistors. It is suitable for applications needing up to 1A load current with moderate efficiency requirements. Consider the 173 kHz switching frequency for balancing component size against electromagnetic interference. Evaluate thermal constraints due to the single-chip power transistor design in the TO-263 package.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2598 family of SIMPLE SWITCHER regulators, which are designed for straightforward implementation of non-isolated DC-DC converters. Unlike the LM2596 series which offers 3A capability, the LM2598 is rated for 1A, making it appropriate for lower-power applications. The family shares similar internal architectures but varies in current handling and switching frequencies.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2598SX-3.3/NOPB: Surface mount variant with identical electrical specifications and pinout. LM2598T-3.3/NOPB: Through-hole alternative using TO-220 package. Verify thermal management requirements differ between surface mount and through-hole implementations.