LP3965EMP-3.3

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The LP3965EMP-3.3 is a fixed-output low-dropout linear regulator from the LP3965 series, manufactured by Texas Instruments. It provides a stable 3.3 V output with a maximum load current of 1.5 A. The device utilizes a SOT-223-5 surface-mount package and operates within an ambient temperature range of -40 °C to +125 °C. Key electrical characteristics include a dropout voltage of 0.55 V at full load and a typical power supply rejection ratio (PSRR) of 60 dB. The component features internal protection mechanisms against overcurrent and thermal overload.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Ultra-low dropout performance enabling efficient regulation with minimal input-to-output voltage differential
• Integrated fast transient response capability for dynamic load conditions
• Built-in thermal shutdown and current limiting protection circuits

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Portable battery-powered equipment requiring efficient voltage regulation
• Cellular phones and wireless communication devices
• Personal digital assistants (PDAs) and handheld computing systems

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix designation during procurement, as the LP3965EMP-3.3 may be designated as NRND (Not Recommended for New Designs). Confirm availability of the alternate part number LP3965EMP-3.3/NOPB for new implementations. Ensure the ordering information matches the required package type and output voltage tolerance specifications defined in the official datasheet.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a fixed 3.3 V rail is required with high current capacity up to 1.5 A. The SOT-223 package offers a balance between thermal dissipation and board space efficiency compared to smaller packages. Consider the PSRR requirements of the downstream circuitry, as the device provides 60 dB rejection at typical frequencies. Verify that the input voltage remains within the specified operational limits relative to the output voltage.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This regulator belongs to the LP3965 family of fast ultra-low dropout linear regulators designed for portable applications. The series includes variants with different fixed output voltages and adjustable versions. The LP3965EMP-3.3 specifically targets applications needing a precise 3.3 V supply from higher voltage sources, such as single-cell lithium-ion batteries or NiCd/NiMH packs, while maintaining high efficiency through low dropout operation.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

The LP3965EMP-3.3/NOPB is the confirmed lead-free alternative to the LP3965EMP-3.3. Both parts share identical electrical specifications and pinouts. Verify that any substitute maintains the same SOT-223-5 package dimensions and thermal characteristics to ensure compatibility with existing PCB footprints.