L4949NG

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

The L4949NG is a fixed-output low dropout (LDO) voltage regulator manufactured by onsemi. It provides a stable 5.0 V output with a maximum load current of 100 mA. The device integrates a power-on reset circuit to ensure system reliability during startup. It operates within an input voltage range of 6 V to 28 V, featuring a typical dropout voltage of 0.3 V and a maximum of 0.5 V at full load. The component is housed in an 8-pin plastic DIP package and is lead-free compliant.

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

• Integrates a power-on reset function for reliable system initialization
• Provides fixed 5.0 V output with 100 mA current capability
• Operates with high input voltage up to 28 V
• Low dropout characteristic ensures efficiency under varying load conditions

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

• Microprocessor supply regulation
• Memory backup power systems
• Embedded controller power management
• Industrial control circuits requiring reset monitoring

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

Verify the specific suffix 'NG' against the official onsemi datasheet to confirm package type and compliance status. Ensure the required output voltage matches the fixed 5.0 V specification. Confirm that the 100 mA load current meets the design requirements. Check for any obsolete status or last-time buy notices from the manufacturer before finalizing procurement plans.

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

Select this component when a fixed 5 V rail is needed alongside a power-on reset signal. The wide input voltage range suits applications with higher bus voltages. The DIP-8 package is suitable for through-hole prototyping or legacy board designs. Verify thermal dissipation capabilities as the device lacks active cooling features in standard operation.

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

The L4949 belongs to onsemi's family of multifunction low dropout regulators. It combines linear regulation with digital reset logic in a single package. This integration reduces component count compared to using separate regulators and reset ICs. The device is designed for cost-sensitive applications requiring basic power management and system supervision.

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

The NCV4949A is a related variant offering additional sense pin functionality. Cross-reference electrical parameters such as dropout voltage and reset threshold timing. Verify package compatibility if replacing in existing PCB layouts. Confirm that the replacement supports the same input voltage range and load current requirements.