DI79L18ZAB

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

The DI79L18ZAB is a negative fixed voltage regulator from the DI79LxxZAB series by Diotec Semiconductor. It provides a nominal output voltage of -18.0 V with a tolerance of ±5%. The device supports an output current of 100 mA and operates within an input voltage range of -20.5 V to -33 V. Key electrical characteristics include a dropout voltage of 1.7 V, quiescent current of 6.5 mA at 25°C, and ripple rejection of 36 dB typical. It features thermal overload protection and short circuit protection, operating at junction temperatures up to 125°C in a TO-92 package.

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

• Integrated thermal overload protection for safe operation under high load conditions
• Short circuit protection capability ensures component safety during fault events
• Fixed negative voltage regulation suitable for stable power supply applications

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

• High efficiency linear regulators
• Active SCSI termination regulator
• Post regulators for switch mode DC-DC converters
• Battery backed-up regulated supply

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

Verify the specific ordering suffix when purchasing. Suffixes such as -Q indicate AEC-Q101 compliance, while -AQ denotes qualification status. Confirm that the required package variant matches the design specifications, as the series is also available in SOT-89 and SO-8 formats. Ensure RoHS compliance requirements are met for the target application environment.

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

Select this component for circuits requiring a stable negative rail near -18 V. Consider the maximum input voltage limits relative to the source supply to ensure adequate headroom without exceeding the -40 V absolute maximum rating. Evaluate thermal dissipation capabilities based on the expected ambient temperature and load current to maintain junction temperature within the specified operational range.

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

This part belongs to the DI79LxxZAB family of negative fixed voltage regulators. The series offers various standard voltage outputs ranging from -5.0 V to -24 V. All variants share common protection features and packaging options, allowing designers to scale voltage requirements while maintaining consistent interface and reliability characteristics across different power management designs.

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

Check for equivalent negative LDO regulators with similar -18 V output and 100 mA current capacity. Verify pinout compatibility if substituting directly into existing PCB layouts. Ensure replacement parts meet the same thermal and short-circuit protection standards.