REG103FA-5/500

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

The REG103FA-5/500 is a fixed-output low-dropout linear regulator from the Texas Instruments REG103 family, manufactured using DMOS topology. It provides a nominal output voltage of 5.0 V with a maximum output current capability of 500 mA. The device operates within an input voltage range of 2.1 V to 15 V and maintains high accuracy with a maximum output voltage error of ±2% over temperature variations from -40°C to +85°C. DC dropout voltage is typically 160 mV at full load, rising to a maximum of 280 mV across the specified temperature range. Ground pin current is 1.3 mA maximum at 500 mA output and drops to 0.5 µA when disabled.

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

• Utilizes new DMOS topology for ultra-low dropout voltage and fast transient response without requiring minimum output capacitance for stability.
• Features very low output noise performance, suitable for sensitive portable communication equipment applications.
• Includes internal foldback current limit and thermal shutdown circuitry to protect against overload and excessive heat.
• Offers high efficiency with relatively constant ground pin current independent of load variations and dropout conditions.

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

• Portable communication devices
• Battery-powered equipment
• Personal digital assistants
• Modems
• Backup power supplies

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

Verify the specific ordering suffix '/500' corresponds to the tube packaging quantity of 50 units in the DDPAK-5 package. Confirm the 'NRND' (Not Recommended for New Designs) status if applicable to your design lifecycle requirements. Ensure compatibility with RoHS standards and moisture sensitivity level 2 as documented in the package option addendum. Cross-reference the exact part number against the latest TI datasheet to confirm availability and lead times before finalizing procurement plans.

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

Select this component when a stable 5.0 V supply is required with minimal headroom voltage drop. The absence of mandatory output capacitors simplifies board layout compared to conventional LDOs. Consider the thermal resistance characteristics of the DDPAK-5 package for heat dissipation calculations. Verify that the input voltage remains above the dropout threshold during worst-case load transients to maintain regulation.

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

This device belongs to the REG103 family of low-noise, low-dropout regulators. The 'FA' designation indicates the DDPAK-5 surface-mount package variant. The '5' specifies the fixed 5.0 V output version. The family shares common features such as DMOS pass elements and internal protection circuits, differing primarily in output voltage settings and physical package configurations like SOT-223-5 or SO-8.

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

Public confirmed substitute part numbers include REG103FA-5/500G3 and REG103FA-5KTTTG3. These variants maintain identical electrical specifications and pinouts while potentially differing in environmental compliance markings or manufacturing lot revisions. Verify package dimensions and thermal characteristics remain compatible with existing footprints.