L4993D

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

The L4993D is an automotive-grade low-dropout voltage regulator manufactured by STMicroelectronics, designed for microprocessor system power supplies. It features a monolithic integrated p-channel MOS output stage capable of delivering up to 150 mA with a maximum input voltage of 40 V. The device operates within a DC supply voltage range of 5.6 V to 31 V and maintains regulation across a wide temperature range from -40°C to +150°C. Key electrical characteristics include a typical dropout voltage of 200 mV at full load and a quiescent current of 180 µA. It incorporates AEC-Q100 qualification, thermal shutdown, short-circuit protection, and integrated watchdog and reset circuits.

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

• Integrated programmable watchdog timer and externally programmable reset circuit with pulse delay control via external capacitor
• High-precision voltage regulation utilizing a pre-trimmed reference voltage and p-channel MOS output element
• Robust protection mechanisms including thermal shutdown and short-circuit protection for high-power dissipation scenarios

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

• Powering microprocessor systems in automotive applications
• Automotive electronic control units requiring AEC-Q100 qualified components
• Systems necessitating active watchdog functionality for safety compliance

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

Verify the specific suffix 'D' against the manufacturer's official datasheet to confirm package type and pin configuration. Ensure the application environment remains within the specified operating temperature range of -40°C to +150°C. Confirm that the required output current does not exceed the 150 mA limit under all operating conditions. Validate that the input voltage stays within the 5.6 V to 31 V range to ensure proper regulation and device integrity.

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

Select this component when designing automotive systems that require a reliable 5 V supply with integrated safety features. The inclusion of a watchdog and reset circuit reduces the need for external monitoring components. Consider the SOIC-20 package dimensions if space constraints exist. Evaluate the 150 mA output capability against the total system load to ensure adequate headroom for transient currents.

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

The L4993 belongs to the L4993 family of automotive low-dropout regulators. It shares functional similarities with the L4995 but offers lower output current capacity. The device is part of STMicroelectronics' portfolio focused on robust power management solutions for harsh automotive environments, emphasizing reliability and integrated system protection features.

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

Consult official substitution lists for verified equivalents. Cross-reference pinouts and electrical specifications carefully before replacing.