Texas Instruments LP2988IM-2.5

Overview

LP2988IM-2.5 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 2.5 V output at ±0.5% accuracy (A-grade), achieves 180 mV dropout at 200 mA load, draws <2 µA quiescent current in shutdown, and operates across −40°C to +125°C - deployed in cellular phones and camcorders where low-noise, stable biasing is critical.

For engineers reviewing the LP2988IM-2.5 datasheet, LP2988IM-2.5 pinout, LP2988IM-2.5 application, or LP2988IM-2.5 equivalent, key selection criteria include its 2.5 V fixed output, 180 mV dropout at full load, bypass-enabled 20 µV(RMS) output noise (BW = 300 Hz–50 kHz), integrated error flag/reset function, and SOIC-8 package compatibility with thermal design constraints up to 125°C junction temperature.

Technical Context

The LP2988IM-2.5 uses a vertically integrated PNP (VIP) pass transistor architecture to achieve ultra-low dropout and low ground pin current - 1 mA at 200 mA load and 200 µA at 10 mA load. Its internal bandgap reference feeds both regulation and the error comparator, enabling precise 0.5% output tolerance and accurate −5% output undervoltage detection.

Power-on reset delay is implemented via an external capacitor on the DELAY pin, charged by a 2.2 µA current source; the ERROR pin provides open-collector reset signaling. The BYPASS pin connects to a 0.01 µF capacitor to reduce output noise by filtering the reference node, a feature exclusive to LP2988 variants.

Key Specifications

Pinout & Package

LP2988IM-2.5 is housed in an 8-pin SOIC 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 low-noise LDO regulator applications.

Compared with TLS850F0TESK and TPS7A2025PDQNR, LP2988IM-2.5 uniquely combines 200 mA capability, 20 µV(RMS) noise with BYPASS, and fully integrated reset timing - making it optimal for cost-sensitive, noise-critical portable systems needing self-contained power sequencing.

Availability

LP2988IM-2.5 is available at Aetrix Electronics and suitable for cellular phone baseband, camcorder image sensor bias, and industrial data logger RTC supply requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.

Supply support for LP2988IM-2.5 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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision power management ICs.

The LP2988 family was designed specifically for noise-sensitive portable electronics - delivering ultra-low-noise regulation, micropower shutdown, and integrated power-on reset in compact surface-mount packages.

FAQ

What is the maximum input voltage rating for LP2988IM-2.5?

The LP2988IM-2.5 has an absolute maximum input voltage of +16 V and a recommended operating input range of 2.1 V to +16 V. Operation above 16 V risks permanent damage; sustained operation near 16 V requires thermal derating based on PCB copper area and ambient temperature per TI Application Note AN-1187.

Does LP2988IM-2.5 support remote sensing?

Yes, LP2988IM-2.5 supports remote sensing via the SENSE pin (Pin 5). When used, SENSE should be connected directly to the load-side of the output capacitor to compensate for IR drop across PCB traces - improving load regulation to ±0.1% over full current range.

How is the power-on reset delay time calculated for LP2988IM-2.5?

The reset delay time T_DELAY (seconds) is calculated as T_DELAY = C_DLY × 5.59×10⁵, where C_DLY is the capacitor value (farads) connected between DELAY pin (Pin 2) and ground. For example, a 100 nF capacitor yields ~56 ms delay. Maximum recommended C_DLY is 1 µF.

What capacitor type is recommended for the BYPASS pin on LP2988IM-2.5?

A 0.01 µF NPO or COG ceramic capacitor is recommended for the BYPASS pin (Pin 1) of LP2988IM-2.5 due to its ultra-low leakage (<1 nA) and stable capacitance over temperature. High-leakage dielectrics (e.g., X7R, Y5V) must be avoided - they degrade output accuracy by loading the internal bandgap reference.

Is LP2988IM-2.5 pin-compatible with LP2987IM-2.5?

No - LP2988IM-2.5 and LP2987IM-2.5 share identical pinout and package (SOIC-8), but differ functionally: LP2988IM-2.5 includes the BYPASS pin (Pin 1) for noise reduction, while LP2987IM-2.5 has NC (no connect) at Pin 1. Interchange requires verifying BYPASS connection and noise requirements in target design.