Texas Instruments LP2985AIM5-1.5/NOPB

Overview

LP2985AIM5-1.5/NOPB from Texas Instruments is a micropower, low-noise, ultra-low-dropout linear regulator delivering 150 mA at fixed 1.5 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 battery-operated systems requiring stable low-voltage rails.

For engineers reviewing the LP2985AIM5-1.5/NOPB datasheet, LP2985AIM5-1.5/NOPB pinout, LP2985AIM5-1.5/NOPB application, or LP2985AIM5-1.5/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 1.6 V enable threshold.

Technical Context

The LP2985AIM5-1.5/NOPB uses a vertically integrated PNP (VIP) process to achieve ultra-low dropout and minimal ground current-825 µA at 150 mA load and 75 µA at 1 mA-enabling high efficiency in low-headroom battery applications. Its internal bandgap reference and dedicated BYPASS pin support low-noise operation when paired with a 10-nF capacitor.

It integrates foldback current limiting and thermal shutdown for robust fault protection, and is explicitly characterized for stable operation with 2.2 µF ceramic output capacitors having ESR as low as 5 mΩ-eliminating need for tantalum or electrolytic types. The ON/OFF pin enables logic-controlled sleep mode with sub-2 µA quiescent current.

Key Specifications

Pinout & Package

LP2985AIM5-1.5/NOPB is packaged in SOT-23-5 (DBV), 2.90 mm × 1.60 mm body size, with exposed pad for thermal enhancement. Pin functions are validated per TI SNOS510Q datasheet Rev Q (October 2016).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC7605CDR and MCP1703T-1502E/MB, LP2985AIM5-1.5/NOPB uniquely combines 280 mV dropout, <1 µA shutdown, and 30 µV_RMS noise in a 5-pin SOT-23-making it optimal for space- and noise-constrained battery-powered designs where all three parameters are simultaneously critical.

Availability

LP2985AIM5-1.5/NOPB is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE sensor nodes, industrial handheld scanners, and automotive cabin camera modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LP2985AIM5-1.5/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 specializing in analog, embedded processing, and digital signal processing technologies, with leadership in power management ICs and precision analog solutions.

The LP2985LV-N product line was designed specifically for micropower, low-noise, ultra-low-dropout regulation in space-constrained, battery-powered applications-including portable medical, consumer, and industrial edge devices-where output voltages ≤2 V and sub-1-µA shutdown are essential.

FAQ

What is the minimum input voltage required for LP2985AIM5-1.5/NOPB to maintain regulation?

The LP2985AIM5-1.5/NOPB requires a minimum input voltage of 2.05 V at 25°C and 2.2 V across −40°C to +125°C to sustain 1.5 V output within specification. This is defined by its dropout voltage: at 150 mA load, typical dropout is 280 mV, so VIN must be ≥1.78 V-but TI specifies 2.2 V minimum to guarantee performance over full temperature and load range. Always verify against actual operating conditions using the VIN(MIN) parameter in Section 6.5 of the SNOS510Q datasheet.

Can LP2985AIM5-1.5/NOPB operate with a 1-µF output capacitor?

No-LP2985AIM5-1.5/NOPB requires a minimum 2.2 µF ceramic output capacitor for stability, as confirmed in Section 8.2.2.1.2 of the SNOS510Q datasheet. Using only 1 µF risks oscillation or poor transient response due to insufficient phase margin. The device is optimized for 2.2 µF or larger ceramics with ESR ≤5 mΩ; increasing capacitance beyond 2.2 µF is permitted and improves load-transient immunity without compromising stability.

How does the BYPASS pin reduce noise in LP2985AIM5-1.5/NOPB?

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 on the reference, reducing output noise from ~100 µV_RMS (no bypass) to 30 µV_RMS (typical, 300 Hz–50 kHz). This capacitor must have <100 nA leakage to avoid degrading output accuracy; NPO/COG ceramics meet this requirement. Omitting it increases noise but does not affect regulation or stability.

Is LP2985AIM5-1.5/NOPB pin-compatible with other LP2985 variants?

Yes-LP2985AIM5-1.5/NOPB shares identical SOT-23-5 (DBV) pinout and footprint with all LP2985LV-N family members, including LP2985AIM5-1.8/NOPB and LP2985AIM5-2.0/NOPB. Pin functions (IN, GND, ON/OFF, BYPASS, OUT) and electrical characteristics (dropout, quiescent current, protection) are consistent across the family. Only the output voltage and minor tolerance specs differ; no PCB redesign is needed when substituting within the same package.

What thermal derating applies to LP2985AIM5-1.5/NOPB in SOT-23 package?

In the SOT-23-5 (DBV) package, LP2985AIM5-1.5/NOPB has a junction-to-ambient thermal resistance (R_θJA) of 175.7°C/W under JEDEC High-K board conditions. At 150 mA load and 1.5 V output, power dissipation is 150 mW; with 25°C ambient, junction temperature rises ~26°C-well within the −40°C to +125°C limit. For continuous 150 mA operation above 85°C ambient, thermal relief (copper pour, airflow) is recommended to avoid thermal shutdown.