LM2578AM/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2578AM/NOPB is a switching regulator control circuit manufactured by Texas Instruments, originally based on National Semiconductor technology. It operates within an input voltage range of 2V to 40V and supports a maximum output current of 750mA with a saturation voltage below 0.9V. The device features an onboard oscillator allowing switch frequencies from 1Hz to 100kHz via an external capacitor. It includes a 1.0V internal reference, overcurrent limiting, and thermal shutdown protection. Designed for industrial applications, it functions across a temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Supports Buck, Boost, Inverting, and Single-Ended Primary Inductor Converter (SEPIC) topologies
• Integrated high-voltage power switch with low saturation voltage
• Adjustable switching frequency using a single external capacitor
• Built-in overcurrent limit and thermal shutdown protection

Voltage Regulators - DC DC Switching Regulators Applications

• Battery-powered equipment power supplies
• RS-232 power configurations
• High-efficiency step-down converters
• Step-up and inverting DC-DC converters

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation as Texas Instruments for the NOPB suffix variant. Confirm the AM suffix indicates the military/industrial temperature grade (-40°C to +125°C). Ensure compatibility with required PCB footprint for SOIC or PDIP packages. Check for RoHS compliance documentation specific to the production lot.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing non-isolated DC-DC converters requiring adjustable frequency and moderate current up to 750mA. It is suitable for applications needing both positive and negative output rails from a single input source. Consider external component ratings for inductors and diodes to match the 40V input limit and peak current demands.

Voltage Regulators - DC DC Switching Regulators Part Context

Part of the LM25xx series of switching regulators, which includes variants like LM2576 and LM2577. This family provides cost-effective solutions for various voltage conversion needs. The LM2578 specifically distinguishes itself by supporting multiple topologies beyond simple buck conversion, offering flexibility in system design.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct equivalents include LM2578-ADJ/NOPB and LM2578HV-ADJ/NOPB for different input ranges. Cross-reference with LM3578 for commercial temperature grades. Verify pinout compatibility before substituting with other switching controller ICs.