Texas Instruments LP2988IM-3.8/NOPB

Overview

LP2988IM-3.8/NOPB from Texas Instruments is a micropower, 200 mA ultra-low-dropout linear voltage regulator with programmable power-on reset delay and bypass pin for noise reduction. It delivers 3.8 V output at ±0.5% accuracy (A-grade), 180 mV dropout at 200 mA, and 20 µV_RMS output noise (BW = 300 Hz–50 kHz) when using 0.01 µF bypass capacitor - deployed in noise-sensitive portable audio and imaging power rails.

For engineers reviewing the LP2988IM-3.8/NOPB datasheet, LP2988IM-3.8/NOPB pinout, LP2988IM-3.8/NOPB application, or LP2988IM-3.8/NOPB equivalent, key selection criteria include its 3.8 V fixed output, SOIC-8 package compatibility, <2 µA shutdown quiescent current, 1.23 V internal reference for reset threshold, and Bypass pin functionality enabling low-noise operation in battery-powered signal chains.

Technical Context

The LP2988IM-3.8/NOPB uses a vertically integrated PNP (VIP) pass transistor architecture to achieve ultra-low dropout (180 mV @ 200 mA) and low ground current (1 mA @ 200 mA). Its error comparator monitors output voltage against a 1.23 V bandgap reference, asserting the open-collector ERROR pin when V_OUT drops >5% below nominal.

Power-on reset delay is implemented via an external capacitor on the DELAY pin, charged by a 2.2 µA current source; the Bypass pin connects directly to the bandgap reference node, allowing external capacitor filtering to suppress output noise without affecting regulation accuracy.

Key Specifications

Pinout & Package

LP2988IM-3.8/NOPB is supplied in an 8-pin SOIC (D) surface-mount package (Package Drawing D0008A), with 1.27 mm pitch, 4.9 mm × 3.9 mm body, and exposed pad not present. Thermal resistance θ_J−A = 160°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TLC7703IPW and TPS7A2038PDBVR, LP2988IM-3.8/NOPB uniquely combines 3.8 V output, Bypass-enabled 20 µV_RMS noise, and integrated DELAY-based POR - making it the only option supporting simultaneous low-noise analog bias and deterministic power-up sequencing in space-constrained portable designs.

Availability

LP2988IM-3.8/NOPB is available at Aetrix Electronics and suitable for portable audio, medical wearables, industrial data acquisition, and imaging sensor bias applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LP2988IM-3.8/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer markets.

LP2988IM-3.8/NOPB belongs to TI's micropower LDO family designed for noise-critical, battery-operated applications where ultra-low dropout, sub-µA shutdown, and integrated power-on reset are essential.

FAQ

What is the maximum allowable input voltage for LP2988IM-3.8/NOPB?

The LP2988IM-3.8/NOPB supports an operating input voltage range of 2.1 V to 16 V. Absolute maximum survival rating is −0.3 V to +16 V on the INPUT pin. Exceeding 16 V may cause permanent damage, and operation below 2.1 V prevents regulation - the device remains functional but cannot maintain 3.8 V output.

How does the Bypass pin reduce output noise in LP2988IM-3.8/NOPB?

The Bypass pin connects directly to the internal 1.23 V bandgap reference node. Adding a 0.01 µF low-leakage capacitor (e.g., COG/NPO ceramic) shunts high-frequency noise from the reference, reducing output noise to 20 µV_RMS. Leakage >1 nA degrades output accuracy, so capacitor dielectric selection is critical for LP2988IM-3.8/NOPB.

Can LP2988IM-3.8/NOPB be used without connecting the DELAY pin?

Yes - the DELAY pin may be left unconnected or tied to GROUND if power-on reset is not required. In that configuration, the ERROR pin functions solely as an undervoltage flag (asserting low when V_OUT drops >5%). No external components are needed for basic regulation, though the SHUTDOWN pin must be pulled high to enable output.

What is the thermal performance of LP2988IM-3.8/NOPB in SOIC-8 package?

In the SOIC-8 (D) package, LP2988IM-3.8/NOPB has a junction-to-ambient thermal resistance (θ_J−A) of 160°C/W. At 200 mA load and 180 mV dropout, power dissipation is 36 mW - resulting in ~5.8°C junction rise above ambient. Derating is required above 85°C ambient to stay within the 125°C max junction limit.

Does LP2988IM-3.8/NOPB support remote sensing, and how is it implemented?

Yes - LP2988IM-3.8/NOPB includes a dedicated SENSE pin for remote voltage sensing. Connect SENSE directly to the load-side of the output trace to compensate for IR drop. When used, the regulator closes the feedback loop at the load rather than at the OUTPUT pin, improving regulation accuracy under varying load currents.