LP2985A-50DBVT

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

The LP2985A-50DBVT is a fixed-output low-dropout (LDO) linear regulator manufactured by Texas Instruments. It provides a nominal output voltage of 5V with a maximum load current capability of 150mA. The device supports an input voltage range up to 16V and features A-grade accuracy of ±1% for output voltage regulation across the operating temperature range. Key electrical parameters include a dropout voltage of approximately 0.28V at full load, a quiescent current of 750µA at 150mA load, and a shutdown current of 1.12µA. It offers high power supply rejection ratio (PSRR) performance of 70dB at 1kHz and 40dB at 1MHz, along with low output noise of 30µV RMS when using a 10nF bypass capacitor.

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

• Provides precise 5V fixed output with ±1% accuracy suitable for sensitive microcontrollers
• Features low-noise operation with 30µV RMS output noise for clean power delivery
• Includes internal soft-start and current limit protection to manage inrush currents
• Operates stably with small 2.2µF ceramic output capacitors

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

• Powering low-voltage microcontrollers and digital logic circuits
• Post-regulation for DC/DC converter outputs to reduce ripple
• Battery-powered systems requiring efficient linear regulation
• Noise-sensitive analog front-end power supplies

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

Verify the specific suffix DBVT corresponds to the SOT-23-5 package variant required for your PCB footprint. Confirm that the A-grade designation meets your system's voltage tolerance requirements compared to standard grade options. Ensure the input voltage never exceeds the 16V absolute maximum rating during transient conditions. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.

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

Select this component when a stable 5V rail is needed with strict noise constraints. The A-grade accuracy ensures tighter voltage tolerances than standard versions. Consider the thermal dissipation capabilities given the 150mA current limit and dropout characteristics. Verify compatibility with the required 2.2µF minimum output capacitance for stability. Evaluate if the shutdown feature is necessary for power management strategies.

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

This part belongs to the LP2985 family of low-noise LDO regulators from Texas Instruments. The family includes various output voltages ranging from 1.2V to 5.0V. The 'A' suffix indicates improved accuracy specifications. The 'DBVT' suffix denotes the surface-mount SOT-23 package type. This series is designed for applications requiring low noise and high PSRR in compact form factors.

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

LP2985-50DBVT: Standard grade version with ±1.5% accuracy instead of ±1%. LP2985A-50DBVR: Same electrical specifications but in tape-and-reel packaging instead of cut tape.