Texas Instruments LP2985IM5-2.0/NOPB

Overview

LP2985IM5-2.0/NOPB from Texas Instruments is a micropower, low-noise, ultra-low-dropout linear regulator delivering 150 mA at fixed 2.0 V output with 1% accuracy (A-grade), 280 mV typical dropout at full load, and <1 µA shutdown current. It operates from 2.2 V to 16 V input and targets power-sensitive portable electronics requiring stable, quiet bias for RF or analog circuitry.

For engineers reviewing the LP2985IM5-2.0/NOPB datasheet, LP2985IM5-2.0/NOPB pinout, LP2985IM5-2.0/NOPB application, or LP2985IM5-2.0/NOPB equivalent, key selection criteria include guaranteed 150-mA output under 125°C junction temperature, ceramic-capacitor stability down to 5 mΩ ESR, 30 µV_RMS noise with 10-nF bypass, and ON/OFF logic control with 0.15 V max disable threshold.

Technical Context

The LP2985IM5-2.0/NOPB uses a vertically integrated PNP (VIP) process to achieve ultra-low dropout (280 mV @ 150 mA) and low ground current (825 µA @ 150 mA). Its internal bandgap reference feeds a precision error amplifier driving a PNP pass transistor, enabling tight 1% output tolerance across –40°C to +125°C.

It integrates active ON/OFF control with hysteresis-free enable logic, foldback current limiting (350 mA peak), thermal shutdown, and stability with ceramic output capacitors ≥2.2 µF and ESR as low as 5 mΩ - eliminating need for tantalum or electrolytic types.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, low-dropout regulator applications.

Compared with LP2985IM5-2.0/NOPB, TPL720F20-DBVR offers lower dropout and noise but narrower VIN headroom, while MCP1703T-2002E/MB trades higher dropout for stronger AC line rejection - making LP2985IM5-2.0/NOPB optimal for battery-powered 2.0 V rails where minimal voltage overhead and proven ceramic stability are essential.

Availability

LP2985IM5-2.0/NOPB is available at Aetrix Electronics and suitable for cellular phone power management, wearable sensor hubs, industrial handheld terminals, and automotive infotainment displays requiring stable component supply across long-lifecycle designs.

Supply support for LP2985IM5-2.0/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 company designing analog, embedded processing, and connectivity technologies for industrial, automotive, and personal electronics markets.

The LP2985LV-N product line delivers micropower, low-noise, ultra-low-dropout regulators optimized for battery-powered portable devices requiring precise, quiet, and thermally robust voltage regulation at 1.5 V–2.0 V outputs.

FAQ

What is the minimum input voltage required for LP2985IM5-2.0/NOPB to maintain 2.0 V regulation at full 150 mA load?

The LP2985IM5-2.0/NOPB requires a minimum input voltage of 2.2 V to maintain regulation across temperature. At 150 mA and 25°C, its typical dropout is 280 mV, so 2.28 V input sustains 2.0 V output. Over –40°C to +125°C, maximum dropout rises to 600 mV, requiring ≥2.6 V input for guaranteed regulation at full load and extreme temperatures. The device's VIN(MIN) specification is 2.05 V at 25°C and 2.2 V over full temperature range.

Can LP2985IM5-2.0/NOPB operate stably with a 1-µF ceramic output capacitor?

No - LP2985IM5-2.0/NOPB requires a minimum 2.2 µF ceramic output capacitor for stability, as specified in the datasheet. Using only 1 µF risks oscillation or poor transient response due to insufficient phase margin. The regulator is optimized for 2.2 µF or larger ceramics with ESR ≥5 mΩ; increasing capacitance improves load-step response without compromising stability.

How does the BYPASS pin on LP2985IM5-2.0/NOPB reduce output noise, and what capacitor value is recommended?

The BYPASS pin connects directly to the internal bandgap reference node. Adding a 10-nF ceramic capacitor between BYPASS and GND shunts high-frequency noise from the reference, reducing total output noise to 30 µV_RMS (300 Hz–50 kHz). NPO/COG dielectric ceramics are recommended for low leakage (<100 nA DC) to avoid output voltage error. Omitting this cap increases noise to ~120 µV_RMS.

Is LP2985IM5-2.0/NOPB pin-compatible with other members of the LP2985LV-N family?

Yes - all LP2985LV-N variants in SOT-23-5 (DBV) package share identical pinout: Pin 1 = IN, Pin 2 = GND, Pin 3 = ON/OFF, Pin 4 = BYPASS, Pin 5 = OUT. This allows drop-in replacement across output voltages (1.5 V–2.0 V) and grades (A/non-A) without PCB changes, provided input/output capacitor values and layout meet each variant's stability requirements.

Does LP2985IM5-2.0/NOPB include overcurrent and thermal protection, and how do they behave under fault conditions?

Yes - LP2985IM5-2.0/NOPB integrates foldback current limiting and thermal shutdown. During short-circuit, peak current reaches 350 mA before folding back to protect the die; sustained overload triggers thermal shutdown, cycling the output off/on until temperature drops. These protections are fully internal - no external components needed - and remain active across –40°C to +125°C, ensuring reliability in unattended or harsh-environment deployments.