LT1579CS-3.3#PBF

Battery Management Overview

The LT1579CS-3.3#PBF is a dual-input, single-output low dropout regulator manufactured by Analog Devices Inc. It provides a fixed 3.3 V output with a maximum current of 300 mA. The device accepts an input voltage range from 2.7 V to 20 V and operates within a temperature range of 0°C to +125°C. Key electrical specifications include a typical power supply rejection ratio (PSRR) of 70 dB, a dropout voltage of 400 mV, and a quiescent current of 50 µA. It features line regulation of 1.5 mV and load regulation of 3 mV. The component is housed in a 16-pin SOIC package.

Battery Management Feature Summary

• Dual-input architecture designed for uninterruptible power delivery from two independent sources
• Integrated automatic switching circuitry for smooth transitions between priority inputs
• Low dropout performance enabling operation with minimal voltage difference between input and output
• High power supply rejection ratio for effective noise suppression

Battery Management Applications

• Smart battery backup systems requiring seamless source switching
• Uninterruptible power supplies for critical electronic loads
• Dual-source power management circuits in portable devices
• Battery-powered equipment needing extended runtime via redundant inputs

Battery Management Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and tube packaging when sourcing. Confirm the manufacturer is Analog Devices Inc. or its authorized successor entities such as Maxim Integrated. Ensure the part number matches the exact 3.3 V fixed output variant. Check datasheet revisions for any pinout or electrical specification updates before final integration.

Battery Management Selection Notes

Select this component when a fixed 3.3 V rail is required from dual battery or power sources. The 300 mA output current suits moderate load applications. Consider the 2.7 V minimum input voltage against your source characteristics. The SOIC-16 package requires appropriate PCB footprint planning. Verify thermal dissipation requirements based on the input-to-output voltage differential and load current.

Battery Management Part Context

This part belongs to the LT1579 series of smart battery backup regulators. The series includes variants with different fixed output voltages and package options. The CS designation typically refers to the commercial temperature grade and SOIC package style. The #PBF suffix denotes lead-free manufacturing compliant with RoHS standards.

Battery Management Replacement Considerations

LT1579CS-3#PBF offers a 3 V output instead of 3.3 V. LT1579IGN-3#TR provides a 3 V output in SSOP-16 packaging. LT1579CS8-5#PBF is an 8-pin variant with 5 V output. Verify pin compatibility and output voltage tolerance before substitution.