LP3985ITL-5.0/NOPB

Updated: 2026-09-19

Overview

The LP3985ITL-5.0/NOPB is a low-dropout linear voltage regulator designed to provide a stable 5.0V output from a higher input voltage. Manufactured by Texas Instruments, this component is part of a family of precision LDO regulators known for their reliability and performance in demanding environments. With a typical dropout voltage of 200mV at 150mA load current, the LP3985ITL-5.0/NOPB offers efficient power conversion while maintaining tight output voltage regulation. The device incorporates thermal shutdown and current limit protection, making it suitable for a wide range of applications where power supply integrity is critical.

Structure and Working Principle

The LP3985ITL-5.0/NOPB features a standard three-terminal design (input, output, and ground) with an additional enable pin for power management. Internally, it consists of a reference voltage source, error amplifier, pass transistor, and protection circuitry. The regulator operates by comparing a fraction of the output voltage to an internal bandgap reference. The error amplifier adjusts the pass transistor to maintain a constant output voltage despite variations in input voltage or load current. This closed-loop control system ensures stable operation across a wide range of conditions.

Key Features

The LP3985ITL-5.0/NOPB offers several notable features that make it attractive for power management applications. These include ultra-low dropout voltage (typically 200mV), excellent line and load regulation (±1.5% typical), and low output noise (30μVRMS typical). The device also provides fast transient response, making it suitable for applications with dynamic load changes. Additional features include thermal shutdown protection (typically at 160°C) and current limit protection (typically 350mA). The NOPB designation indicates that the device is lead-free and RoHS compliant, meeting environmental regulations.

Application Areas

The LP3985ITL-5.0/NOPB finds application in various electronic systems requiring clean, stable voltage regulation. Common uses include power supplies for microcontrollers, FPGAs, and other digital ICs in industrial control systems, automotive electronics, and consumer devices. In portable electronics, the regulator's low dropout voltage extends battery life. Medical equipment benefits from its stable output and low noise characteristics. The device is also used in instrumentation and measurement systems where precise voltage references are required for accurate signal processing.

Maintenance and Precautions

Proper implementation of the LP3985ITL-5.0/NOPB requires attention to several design considerations. Adequate input and output capacitance must be provided according to the manufacturer's recommendations to ensure stability and transient response. The input voltage should not exceed the absolute maximum rating (typically 6V) to prevent device damage. Thermal management is important, especially when operating near maximum load current. PCB layout should minimize thermal resistance by using appropriate copper areas or thermal vias. For applications with sensitive analog circuits, careful attention to grounding and noise reduction techniques is recommended.

B2B Procurement Guide

When procuring LP3985ITL-5.0/NOPB regulators in quantity, consider several factors to ensure optimal supply chain management. Verify the manufacturer's current lead times and minimum order quantities, as these can vary based on market demand. Evaluate potential suppliers based on their authorized distributor status, inventory levels, and ability to provide technical support. Consider ordering samples for testing before committing to large purchases. For long-term projects, explore volume pricing agreements or consignment stocking arrangements with trusted suppliers to secure stable supply and favorable pricing.