Texas Instruments LP2987IMM-3.3/NOPB

Overview

LP2987IMM-3.3/NOPB from Texas Instruments is a fixed-output 3.3 V, 200 mA ultra-low-dropout linear regulator with programmable power-on reset delay, 180 mV dropout at 200 mA, 0.5% output voltage accuracy (A-grade), and −40°C to +125°C operating junction temperature. It serves as a precision local power supply in battery-powered portable electronics requiring stable low-noise voltage regulation.

For engineers reviewing the LP2987IMM-3.3/NOPB datasheet, LP2987IMM-3.3/NOPB pinout, LP2987IMM-3.3/NOPB application, or LP2987IMM-3.3/NOPB equivalent, key selection criteria include dropout performance under 200 mA load, reset delay configurability via external capacitor, shutdown quiescent current <2 µA, and VSSOP-8 thermal characteristics for compact PCB layouts.

Technical Context

The LP2987IMM-3.3/NOPB uses a vertically integrated PNP pass transistor architecture enabling 180 mV dropout at full 200 mA load and only 1 mV at 1 mA. Its error flag output provides both undervoltage detection (−5% threshold) and power-on reset functionality when paired with an external capacitor on the DELAY pin.

It integrates a precision 1.23 V bandgap reference, open-collector ERROR output with 220 mV low-level voltage at 300 µA sink, and shutdown control with defined turn-on/turn-off thresholds (VH = 1.6 V, VL = 0.18 V). The VSSOP-8 package delivers θ_J−A = 200°C/W, supporting continuous operation up to 125°C junction temperature.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) surface-mount package: 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed thermal pad, RoHS-compliant matte tin lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP2987IMX-3.3/NOPB, the LP2987IMM-3.3/NOPB provides superior thermal performance per unit area and smaller PCB footprint; versus LP2988AIMM-3.3/NOPB, it trades 5× higher output noise for lower cost and absence of bypass capacitor dependency.

Availability

LP2987IMM-3.3/NOPB is available at Aetrix Electronics and suitable for cellular phone power management, palmtop/laptop subsystem supply, and camcorder image sensor bias requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LP2987IMM-3.3/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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and automotive/industrial qualification.

The LP2987 series belongs to TI's precision LDO portfolio designed for battery-powered portable electronics demanding ultra-low dropout, low quiescent current, and integrated power-management features like reset delay and shutdown control.

FAQ

What is the maximum input voltage rating for LP2987IMM-3.3/NOPB?

The LP2987IMM-3.3/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 may cause permanent damage. For reliable operation with 3.3 V output, minimum input is 3.48 V (accounting for 180 mV dropout at 200 mA), making it compatible with single-cell Li-ion (3.0–4.2 V) and three-cell alkaline (3.6–4.5 V) sources. LP2987IMM-3.3/NOPB must be protected against reverse input-output voltage using an external Schottky diode if V_OUT can exceed V_IN.

How is the power-on reset delay configured on LP2987IMM-3.3/NOPB?

The power-on reset delay on LP2987IMM-3.3/NOPB is set using a single external capacitor connected between the DELAY pin and ground. An internal 2.2 µA current source charges this capacitor after the output reaches regulation; the ERROR pin remains low until the DELAY pin voltage reaches 1.23 V. Delay time (T_DELAY) is calculated as T_DELAY = C_DLY × 5.59 × 10⁵, with C_DLY ≤ 1 µF recommended. LP2987IMM-3.3/NOPB does not require additional resistors or supervisors-only the capacitor defines reset timing.

Does LP2987IMM-3.3/NOPB include a bypass pin for noise reduction?

No, LP2987IMM-3.3/NOPB does not include a BYPASS pin. That feature is exclusive to the LP2988 variant (e.g., LP2988AIMM-3.3/NOPB), which achieves 20 µV RMS output noise using a 0.01 µF capacitor on the BYPASS pin. LP2987IMM-3.3/NOPB delivers 100 µV RMS noise without bypass capacitance and shares identical pinout, package, and regulation specifications otherwise. If low-noise performance is critical, LP2987IMM-3.3/NOPB should not be substituted for LP2988AIMM-3.3/NOPB without verifying noise budget margins.

What thermal considerations apply to LP2987IMM-3.3/NOPB in VSSOP-8 package?

LP2987IMM-3.3/NOPB in VSSOP-8 (DGK) package has a junction-to-ambient thermal resistance (θ_J−A) of 200°C/W. At 200 mA load with 3.48 V input and 3.3 V output, power dissipation is ~36 mW, resulting in ~7.2°C junction rise above ambient. To maintain T_J ≤ 125°C, maximum ambient must stay ≤ 118°C. Adequate copper pour on the thermal pad and 2+ thermal vias to inner ground planes are strongly recommended. LP2987IMM-3.3/NOPB must not operate continuously above its rated junction temperature, and thermal shutdown activates if exceeded.

Can LP2987IMM-3.3/NOPB be used with ceramic output capacitors?

Yes, LP2987IMM-3.3/NOPB supports ceramic output capacitors, but requires a 1 Ω series resistor to ensure stability due to their ultra-low ESR. The minimum output capacitance is 4.7 µF, and capacitor selection must guarantee ESR stays within the stable region across −40°C to +125°C. Z5U ceramics are discouraged due to >50% capacitance loss at elevated temperatures; X7R or C0G types are preferred. LP2987IMM-3.3/NOPB is optimized for tantalum capacitors (ideal ESR, stable over temperature), but ceramic use is viable with proper series resistance and derating.