Texas Instruments LP2988IMX-5.0

Overview

LP2988IMX-5.0 from Texas Instruments is a micropower, ultra-low-dropout linear voltage regulator delivering a fixed 5.0 V output at up to 200 mA continuous load, featuring a bypass pin for noise reduction, programmable power-on reset delay via external capacitor, and <2 μA shutdown quiescent current. It serves as a precision low-noise supply for analog signal chains in portable instrumentation and RF front-ends.

For engineers reviewing the LP2988IMX-5.0 datasheet, LP2988IMX-5.0 pinout, LP2988IMX-5.0 application, or LP2988IMX-5.0 equivalent, key selection criteria include dropout voltage at 200 mA (180 mV typ), output noise performance (20 µV RMS with 0.01 µF bypass), reset threshold accuracy (±5% of nominal), and SOIC-8 thermal resistance (160°C/W).

Technical Context

The LP2988IMX-5.0 uses a vertically integrated PNP (VIP) pass transistor architecture enabling ultra-low dropout and low ground current across load range. Its error comparator monitors output voltage against an internal 1.23 V reference, asserting the open-collector ERROR pin when output falls >5% below 5.0 V.

Power-on reset timing is set by charging an external capacitor on the DELAY pin using a 2.2 µA current source; the Bypass pin connects directly to the bandgap reference to reduce output noise via external 0.01 µF low-leakage capacitor.

Key Specifications

Pinout & Package

LP2988IMX-5.0 is packaged in an 8-pin SOIC (D package, drawing D0008A), with 1.27 mm pitch, 6.0 mm × 4.9 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 TLS850F0TES/V2 and TPS7A2050PDBVR, the LP2988IMX-5.0 uniquely combines programmable POR delay, remote sense capability, and bypass-enabled ultra-low noise in a legacy-qualified SOIC-8 package-making it optimal for cost-sensitive industrial and medical designs requiring design-in longevity.

Availability

LP2988IMX-5.0 is available at Aetrix Electronics and suitable for portable medical sensors, automotive infotainment subsystems, and industrial IoT edge nodes requiring stable component supply across extended product lifecycles.

Supply support for LP2988IMX-5.0 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 solutions, with leadership in power management ICs since the 1980s.

The LP2988IMX-5.0 belongs to TI's micropower LDO family designed for noise-sensitive, battery-constrained applications where ultra-low dropout, low ground current, and precise reset functionality are essential.

FAQ

What is the maximum input voltage rating for the LP2988IMX-5.0?

The LP2988IMX-5.0 has an absolute maximum input voltage of +16 V for survival and an operating input range of 2.1 V to +16 V. Exceeding 16 V risks permanent damage. For reliable long-term operation, maintain VIN ≤15.5 V under worst-case transient conditions per TI's recommended derating guidelines.

Does the LP2988IMX-5.0 require an external capacitor on the SENSE pin?

Yes-the SENSE pin must be connected directly to the load-side of the output capacitor or to the load itself for remote sensing. If local regulation is sufficient, SENSE may be tied directly to OUTPUT. Leaving SENSE floating will cause regulation instability and output inaccuracy in the LP2988IMX-5.0.

Can the LP2988IMX-5.0 be used without connecting the BYPASS pin?

Yes, the LP2988IMX-5.0 functions without the BYPASS capacitor, but output noise increases from 20 µV RMS to ~100 µV RMS (matching LP2987 performance). For noise-critical applications like precision ADCs or RF biasing, the 0.01 µF low-leakage capacitor on BYPASS is mandatory to achieve specified LP2988IMX-5.0 noise performance.

What is the minimum recommended output capacitor for stable operation of the LP2988IMX-5.0?

The LP2988IMX-5.0 requires a minimum 4.7 µF output capacitor with ESR between 0.1 Ω and 2 Ω for guaranteed stability across temperature and load. Tantalum capacitors are preferred; if ceramic is used, a 1 Ω series resistor must be added to meet minimum ESR requirements per TI Application Hints.

How does the ERROR pin behave during startup and fault conditions in the LP2988IMX-5.0?

The ERROR pin is an open-collector output that remains low until the output reaches ≥95% of 5.0 V (i.e., ≥4.75 V) and stays high thereafter unless output drops below that threshold. During startup, it provides a clean power-on reset pulse; during overcurrent or thermal shutdown, it asserts low to signal fault condition in the LP2988IMX-5.0.