Texas Instruments LP2988AIMM-5.0/NOPB

Overview

LP2988AIMM-5.0/NOPB from Texas Instruments is a micropower, ultra-low-dropout linear voltage regulator delivering 5.0 V at up to 200 mA with 0.5% output accuracy (A-grade), 180 mV dropout at full load, and integrated power-on reset delay via external capacitor. It features a dedicated Bypass pin for noise reduction and operates across −40°C to +125°C junction temperature in noise-sensitive portable electronics.

For engineers reviewing the LP2988AIMM-5.0/NOPB datasheet, LP2988AIMM-5.0/NOPB pinout, LP2988AIMM-5.0/NOPB application, or LP2988AIMM-5.0/NOPB equivalent, key selection criteria include its 20 µV(RMS) output noise (with 0.01 µF bypass cap), <2 µA shutdown current, programmable reset delay, and VSSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The LP2988AIMM-5.0/NOPB 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 - while maintaining stability with minimal external capacitance. Its error comparator provides an open-collector reset flag triggered by 5% output undervoltage, and the DELAY pin accepts a single capacitor to set power-on reset timing.

Unlike the LP2987, the LP2988 variant includes a dedicated BYPASS pin connected to the internal bandgap reference; adding a low-leakage capacitor (e.g., NPO ceramic) here reduces output noise to 20 µV(RMS) over 300 Hz–50 kHz, making it suitable for RF, audio, and precision analog subsystems where supply rail cleanliness is critical.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: thermally enhanced, lead-free, RoHS-compliant surface-mount housing with exposed thermal pad (not electrically connected). Pin 1 marked by dot; pin numbering counterclockwise from top-left corner when viewed top-down.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP2987AIMM-5.0/NOPB and TLS850F0TESA1, the LP2988AIMM-5.0/NOPB uniquely balances ultra-low noise, micropower shutdown, and compact VSSOP-8 packaging - making it optimal for portable, battery-constrained, and analog-intensive designs where neither cost nor automotive qualification dominate.

Availability

LP2988AIMM-5.0/NOPB is available at Aetrix Electronics and suitable for cellular phone power management, medical sensor module supply, industrial PLC I/O modules, and automotive infotainment display backlight control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LP2988AIMM-5.0/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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in power management IC design and manufacturing.

The LP2988 belongs to TI's precision LDO regulator product line, engineered specifically for noise-critical portable and industrial applications demanding ultra-low dropout, micropower operation, and integrated power sequencing capability.

FAQ

What is the maximum input voltage rating for LP2988AIMM-5.0/NOPB?

The LP2988AIMM-5.0/NOPB has an absolute maximum input supply voltage of +16 V and a recommended operating range of 2.1 V to +16 V. Exceeding 16 V risks permanent damage. For automotive applications with load-dump transients, external clamping (e.g., TVS diode) is advised to keep VIN within limits while preserving the LP2988AIMM-5.0/NOPB's internal protection features.

How does the BYPASS pin on LP2988AIMM-5.0/NOPB reduce output noise?

The BYPASS pin on LP2988AIMM-5.0/NOPB connects directly to the internal bandgap reference node. Adding a low-leakage, low-ESR capacitor (e.g., 0.01 µF NPO ceramic) shunts high-frequency noise from the reference, reducing total output noise from 100 µV(RMS) (LP2987) to 20 µV(RMS). This is critical for powering precision analog circuits where supply ripple couples into signal paths.

Can LP2988AIMM-5.0/NOPB be used with ceramic output capacitors?

Yes, LP2988AIMM-5.0/NOPB supports ceramic output capacitors, but a series resistor (~1 Ω) is required to ensure stability due to their ultra-low ESR. The minimum recommended output capacitance is 4.7 µF, and capacitor tolerance/temperature drift must be evaluated - e.g., Z5U ceramics may lose >50% capacitance above 80°C, risking instability. Tantalum remains the preferred choice for guaranteed stability.

What is the function of the ERROR pin on LP2988AIMM-5.0/NOPB?

The ERROR pin on LP2988AIMM-5.0/NOPB is an open-collector output that asserts low when the regulated output falls more than ~5% below 5.0 V (i.e., below 4.75 V). It serves dual roles: as a power-good indicator and as a programmable power-on reset signal when combined with the DELAY pin capacitor. An external pull-up resistor is mandatory for proper logic-level signaling to the host MCU.

Is LP2988AIMM-5.0/NOPB pin-compatible with other LP298x regulators in VSSOP-8?

Yes, LP2988AIMM-5.0/NOPB is pin-compatible with LP2987AIMM-5.0/NOPB and other VSSOP-8 variants in the LP2987/LP2988 family (e.g., LP2988AIMM-3.3/NOPB), sharing identical pinout, footprint, and thermal pad layout. This enables drop-in replacement where noise performance is upgraded - though the BYPASS pin must be properly terminated (capacitor + ground) to realize the LP2988AIMM-5.0/NOPB's low-noise benefit.