LP3990MF-1.8/NOPB

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

The LP3990MF-1.8/NOPB is a micropower low-dropout (LDO) voltage regulator manufactured by Texas Instruments, formerly National Semiconductor. It provides a fixed positive output of 1.8V with a maximum load current of 150mA. The device utilizes CMOS technology to achieve very low quiescent current, making it suitable for battery-powered applications. It operates within an input voltage range up to 6V and features active shutdown capability to minimize power consumption during standby modes.

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

• Micropower CMOS architecture designed for extended battery life in portable electronics
• Active shutdown mode functionality to significantly reduce quiescent current when disabled
• Fixed 1.8V output voltage option ensuring stable regulation without external feedback components

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

• Portable consumer electronics requiring low-power voltage regulation
• Battery-operated devices utilizing active shutdown for power management
• RF and analog circuits needing stable micropower supply rails

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

Verify the manufacturer designation as Texas Instruments, which acquired National Semiconductor. Confirm the suffix NOPB indicates lead-free and RoHS compliance. Ensure the package type matches the required SOT-23 or DSBGA form factor for your PCB layout. Cross-reference the specific output voltage version to ensure compatibility with system requirements.

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

Select this component when a fixed 1.8V output is required with minimal static current draw. Consider the active shutdown feature if system power management demands deep sleep states. Evaluate the dropout voltage characteristics against your minimum input voltage constraints. Verify thermal performance within the intended operating temperature range of -40°C to +125°C.

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

This part belongs to the LP399x series of micropower LDO regulators from National Semiconductor/Texas Instruments. The series offers various fixed output voltages and packaging options including SOT-23 and micro-packages. These regulators are designed for applications where power efficiency and small footprint are critical priorities.

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

Check for direct equivalents such as LP3995 variants with similar pinouts and electrical characteristics. Verify that substitute parts maintain the same 150mA output current and active shutdown functionality. Ensure package compatibility before replacing the component in existing designs.