L4949D

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

The L4949D is a monolithic integrated 5.0 V low dropout (LDO) voltage regulator manufactured by ON Semiconductor. It provides a fixed output current of 100 mA with a typical dropout voltage of 0.3 V and a maximum of 0.5 V at rated load. The device operates within an input voltage range of 6 V to 28 V, featuring absolute maximum ratings up to 28 V. Key integrated functions include a power-on reset circuit and an uncommitted voltage sense comparator. The component is housed in an 8-pin DIP package.

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

• Integrates a power-on reset generator for microprocessor system supervision
• Includes an uncommitted voltage sense comparator for external monitoring applications
• Provides very low dropout performance for efficient linear regulation

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

• Microprocessor power supply systems requiring reset supervision
• Battery-powered equipment utilizing low dropout regulation
• General-purpose 5V logic power distribution networks

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

Verify the specific suffix 'D' indicates the DIP-8 plastic package configuration as documented in distributor databases. Confirm lead-free status and RoHS compliance against the latest manufacturer datasheet revision. Ensure the application environment remains within the specified 6 V to 28 V input range to maintain regulatory stability and prevent damage to the internal circuitry.

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

Select this component when a fixed 5.0 V output with integrated reset functionality is required. The L4949D is suitable for designs needing minimal external components compared to discrete solutions. Consider the thermal dissipation capabilities inherent to the DIP-8 package for the intended load current and ambient temperature conditions.

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

The L4949 belongs to a family of multifunction low dropout regulators from ON Semiconductor. It shares functional similarities with the NCV4949A but differs in automotive qualification status. The device represents a legacy solution for 5V logic systems, often superseded by newer series like the CS81xx line which offer enhanced features such as watchdog timers or lower quiescent currents.

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

The NCV4949A is a direct functional equivalent offering similar electrical characteristics. For non-automotive applications, verify pin compatibility and package dimensions before substitution.