LM2598T-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2598T-3.3/NOPB is a SIMPLE SWITCHER step-down switching regulator manufactured by Texas Instruments, designed for through-hole mounting in a TO-220-7 package. It operates with an input voltage range of 4.5V to 40V and provides a fixed output voltage of 3.3V at a maximum output current of 1A. The device integrates a 150kHz switching frequency and includes internal frequency compensation and a 52mA oscillator discharge function for rapid startup. It features thermal shutdown and current limit protection, operating reliably within a junction temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a monolithic switching regulator with built-in frequency compensation and control circuitry
• Includes internal oscillator discharge function for fast transient response during startup
• Provides comprehensive protection against thermal overload and excessive current draw

Voltage Regulators - DC DC Switching Regulators Applications

• Distributed power supply systems requiring buck conversion
• Pre-regulator circuits for switching regulators
• Efficient on-card regulation from bus voltages

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'T' confirms the TO-220-7 through-hole package variant rather than surface-mount options. Confirm the '-3.3' designation matches the required 3.3V fixed output specification. Ensure the 'NOPB' indicator aligns with lead-free and RoHS compliance requirements for your assembly process. Cross-reference the manufacturer part number directly with official datasheets to avoid confusion with similar series components.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust, high-current buck converter is needed for through-hole applications. It is suitable for designs requiring wide input voltage ranges up to 40V. Consider the thermal performance of the TO-220 package for heat dissipation needs. Verify that the 1A output current meets the load requirements without exceeding thermal limits under expected ambient conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2598 family of SIMPLE SWITCHER regulators, which are known for simplifying power supply design. The LM2598 series offers various fixed output voltages and packaging options. The TO-220 variant provides higher current handling capabilities compared to smaller surface-mount packages, making it ideal for industrial and commercial applications where board space allows for larger footprints.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2598T-ADJ/NOPB: Adjustable output version with identical pinout and specifications.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the purpose of the internal oscillator discharge function?

It ensures fast start-up times by rapidly discharging the oscillator capacitor, allowing the regulator to respond quickly to enable signals.

Does the LM2598T-3.3/NOPB support external synchronization?

No, the standard LM2598 operates at a fixed 150kHz frequency and does not include a pin for external clock synchronization.