L4993MD

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

The L4993MD is an automotive-grade low-dropout voltage regulator manufactured by STMicroelectronics, housed in a SOIC-20 surface-mount package. It provides a fixed 5 V output with a maximum current of 150 mA and operates within a DC supply voltage range of 5.6 V to 31 V. The device features a p-channel MOS regulating element, ensuring regulation against input transients up to 40 V. Key electrical parameters include a dropout voltage of 200 mV (max 400 mV at 150 mA), static current of 180 uA, and line/load regulation of 25 mV. It supports negative and positive polarity outputs, adjustable output types, and functions across a temperature range of -40°C to +150°C.

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

• Integrated watchdog timer and reset circuit for microprocessor system supervision
• Programmable reset pulse delay and watchdog timer using external capacitors
• High precision output voltage maintained via pre-trimmed reference voltage
• Built-in thermal shutdown and short-circuit protection mechanisms

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

• Supplying microprocessor systems in automotive applications
• Automotive electronic control units requiring AEC-Q100 qualification
• Power management circuits for embedded automotive controllers

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

Verify the specific suffix 'MD' corresponds to the SOIC-20 package and tube packaging configuration as listed in official distributor catalogs. Confirm AEC-Q100 qualification status and RoHS compliance details directly from the manufacturer's datasheet before procurement. Ensure the ordering part number matches the exact functional requirements regarding the watchdog and reset configurations.

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

Select this component when a fixed 5 V output with high accuracy is required for automotive microprocessors. The integrated watchdog and reset features simplify design compared to discrete solutions. Consider the 150 mA output current limit and 40 V input transient tolerance. Verify that the SOIC-20 package fits the board layout constraints and that the wide operating temperature range meets the environmental specifications.

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

The L4993 belongs to STMicroelectronics' L4993 series of automotive low-dropout regulators. This family is designed specifically for robust power management in vehicle environments. The L4993MD variant shares core functionalities with other members like the L4979 but offers specific package and pinout configurations suitable for different PCB designs while maintaining automotive reliability standards.

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

The L4979MD is a related device in the same product family offering similar low-dropout regulation and microprocessor control functions. Verify pin compatibility and specific parameter differences such as quiescent current variations before substitution.