AP78L12SG-13

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

The AP78L12SG-13 is a three-terminal positive linear voltage regulator from the AP78LXX series, manufactured by Diodes Incorporated. It provides a fixed output voltage of 12V with an output current capability exceeding 100mA. The device operates within an input voltage range of 14.5V to 27V and supports an operating ambient temperature range of -20°C to +85°C. It utilizes SO-8 surface-mount packaging and incorporates internal thermal overload protection, short-circuit current limiting, and safe area protection for the output transistors.

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

• Provides local on-card regulation to eliminate distribution problems associated with single-point regulation systems.
• Features built-in thermal overload protection to prevent damage due to excessive junction temperatures.
• Includes internal short-circuit current limiting and safe-area protection for the pass transistor.
• Delivers improved output impedance compared to Zener diode/resistor combinations.

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

• Logic systems
• Communication equipment
• CD-ROM drives
• DVD players
• Set-top boxes

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

Verify that the component matches the specific AP78L12SG-13 designation, confirming the 12V fixed output and SO-8 package type. Ensure compliance with RoHS directives and confirm the presence of green molding compound without bromine or antimony. Cross-reference datasheet DS31054 Rev. 10 for accurate electrical characteristics and pin assignments before integration.

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

Select this regulator when a fixed 12V supply is required with moderate current demands up to 100mA. The SO-8 package is suitable for space-constrained surface-mount designs. Consider the maximum input voltage limit of 27V and ensure adequate heat dissipation for the chosen operating conditions to maintain performance within specified thermal limits.

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

This component belongs to the AP78LXX series of three-terminal positive regulators, which also includes variants for 5V and 8V outputs. The series is designed as a replacement for Zener diode and resistor combinations, offering superior stability and lower quiescent current. It is part of Diodes Incorporated's portfolio of power management integrated circuits focused on general-purpose voltage regulation.

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

Direct replacements include other manufacturers' 78L12 equivalents in SO-8 packages, such as the LM78L12ACD from Texas Instruments. Verify pin compatibility and thermal resistance specifications when substituting to ensure equivalent performance in the target application circuit.

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

What is the minimum input voltage required to maintain line regulation?

The minimum input voltage required to maintain line regulation is 14.5V.

Does the AP78L12SG-13 require external components for basic operation?

No external components are required for basic fixed voltage regulation, although capacitors may be needed depending on the physical location relative to the power supply filter.

How does the AP78L12SG-13 protect against abnormal conditions?

It integrates thermal overload protection to prevent overheating and internal short-circuit current limiting to restrict peak output current to a safe value.