LP38858T-0.8/NOPB

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

The LP38858T-0.8/NOPB is a fixed positive linear voltage regulator (LDO) manufactured by National Semiconductor, now part of Texas Instruments. It provides a fixed output voltage of 0.8V with a maximum output current of 1.5A. The device features a wide input supply operating range from 3.0V to 5.5V and maintains regulation with an extremely low input-to-output voltage differential. Key electrical specifications include a maximum dropout voltage of 0.18V at 1.5A load, a typical quiescent current of 8.5mA, and a power supply rejection ratio (PSRR) ranging from 80dB at 120Hz to 65dB at 1kHz. It is housed in a TO-220-5 package.

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

• Provides high-accuracy fixed output voltage regulation with fast transient response capabilities.
• Features integrated protection mechanisms including overcurrent limiting, thermal shutdown, short-circuit protection, and undervoltage lockout (UVLO).
• Incorporates a soft-start function to limit inrush current during power-up sequences.

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

• Portable battery-powered equipment requiring efficient power management.
• Cellular phones and other wireless communication devices.
• PDA (Personal Digital Assistant) systems.
• Notebook computers and portable computing hardware.

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

Verify the manufacturer designation, as National Semiconductor assets were acquired by Texas Instruments; parts may bear TI branding or legacy NS markings. Confirm the suffix 'NOPB' indicates lead-free/RoHS compliance. Ensure the TO-220-5 package matches your thermal and mechanical design requirements. Cross-reference the specific 0.8V output variant against the official datasheet to confirm pinout and electrical characteristics before integration.

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

Select this component when a stable 0.8V rail is required for low-voltage digital logic or analog circuits. The TO-220-5 package offers superior thermal dissipation compared to surface-mount options, making it suitable for applications where heat removal is critical. Evaluate the input voltage headroom to ensure the LDO operates within its specified dropout region under all load conditions. Consider the 1.5A current capability against peak system demands to prevent thermal throttling.

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

The LP38858 series belongs to a family of 1.5A fast-response high-accuracy LDO regulators designed for demanding portable applications. While the SX variant utilizes a surface-mount TO-263 package, the T variant specifically employs the through-hole TO-220-5 configuration. This series is engineered to replace bulkier switching regulators in space-constrained designs while maintaining efficiency and stability across varying load and line conditions.

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

Direct substitutes include the LP38858SX-0.8/NOPB, noting the package difference between TO-263 and TO-220. Other LP3885x variants with different output voltages share identical pinouts and functionality but require voltage verification. Legacy National Semiconductor parts without the NOPB suffix may differ in environmental compliance.