L4988D

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

The L4988D is a monolithic integrated automotive low-drop voltage regulator providing a fixed 5V output with a maximum current of 200mA. It utilizes a p-channel MOS regulating element to maintain regulation despite input voltage transients up to 40V. The device operates within a DC supply voltage range of 5.6V to 31V and features a wide junction temperature range from -40°C to 150°C. High precision is achieved via a pre-trimmed reference voltage, while built-in protections include thermal shutdown and short-circuit limiting.

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

• AEC-Q100 qualified for automotive reliability standards
• Integrated reset circuit sensing output voltage down to 1V with programmable pulse delay
• Programmable watchdog timer functionality controlled by an external capacitor
• Enable input allows for active control of the regulator and watchdog states

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

• Supplying microprocessor systems in automotive environments
• Automotive electronic control units requiring stable 5V logic power
• Systems necessitating hardware-based reset and watchdog monitoring

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

Verify component status as the L4988 series may be classified as obsolete or not recommended for new designs. Confirm availability through authorized distributors and check for valid replacement part numbers before procurement planning. Ensure all ordering specifications match the required package and suffix variants.

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

Select this regulator when a fixed 5V output with 200mA capability is required for automotive microprocessors. It is suitable for applications needing integrated reset and watchdog functions without external components. Consider the 40V transient tolerance and wide temperature range for harsh automotive electrical environments.

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

The L4988D belongs to STMicroelectronics' family of automotive low-drop voltage regulators designed for high-reliability applications. These devices integrate linear regulation with advanced microprocessor control features, distinguishing them from standard linear regulators by including on-chip reset and watchdog timers essential for system safety.

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

Consult official documentation for confirmed substitute part numbers due to potential obsolescence. Verify that any replacement maintains AEC-Q100 qualification, identical pinout, and equivalent electrical characteristics for automotive microprocessor supply.