Texas Instruments LP2985IM5-3.0

Overview

LP2985IM5-3.0 from Texas Instruments is a micropower, ultra-low-dropout linear regulator delivering 150 mA output current with 3.0 V fixed output, 300 mV typical dropout at full load, 1% output voltage accuracy (A-grade), and 30 µV_RMS output noise (300 Hz–50 kHz) when using a 10-nF bypass capacitor. It serves as a precision low-noise power supply for battery-powered portable electronics requiring stable 3.0 V rail generation.

For engineers reviewing the LP2985IM5-3.0 datasheet, LP2985IM5-3.0 pinout, LP2985IM5-3.0 application, or LP2985IM5-3.0 equivalent, key selection criteria include its SOT-23-5 package footprint, ON/OFF logic control interface, compatibility with low-ESR ceramic capacitors (≥2.2 µF), shutdown quiescent current < 1 µA, and thermal/overcurrent protection - all critical for space-constrained, low-power embedded designs.

Technical Context

The LP2985IM5-3.0 uses a vertically integrated PNP (VIP) process to achieve ultra-low dropout (280–575 mV at 150 mA over temperature) and low ground current (75 µA at 1 mA, 850 µA at 150 mA). Its internal reference and feedback loop ensure 1% output accuracy across –40°C to 125°C junction temperature.

It integrates an ON/OFF control input enabling logic-level shutdown (< 0.15 V disables), a dedicated BYPASS pin for external 10-nF capacitor connection to reduce output noise, and foldback current limiting with thermal shutdown - enabling robust operation in transient and fault conditions without external protection circuitry.

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, ultra-low-dropout regulator applications.

Compared with MCP1700T-3002E/MB and TLC7703IPK, the LP2985IM5-3.0 uniquely combines 3.0 V output, ON/OFF control, <1 µA shutdown, and 30 µV_RMS noise via BYPASS - making it the only choice for battery-powered analog-sensitive systems needing precise 3.0 V regulation in SOT-23-5.

Availability

LP2985IM5-3.0 is available at Aetrix Electronics and suitable for cellular handset power rails, portable medical sensor supplies, industrial IoT node microcontrollers, smart camera image sensor bias, and other applications requiring stable component supply with guaranteed long-term sourcing.

Supply support for LP2985IM5-3.0 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 technologies, with leadership in power management ICs since the 1980s.

The LP2985-N product line was designed specifically for micropower, ultra-low-dropout regulation in space-constrained, battery-powered portable electronics - emphasizing low noise, minimal external components, and wide input voltage tolerance.

FAQ

What is the minimum input voltage required for LP2985IM5-3.0 to regulate 3.0 V output?

The LP2985IM5-3.0 requires a minimum input voltage of 3.1 V under recommended operating conditions - defined as the greater of 3.1 V or V_OUT(MAX) + rated dropout voltage (max) for the operating load current. At 150 mA, maximum dropout is 575 mV, so VIN must be ≥3.575 V to guarantee regulation across temperature and process variation.

Can LP2985IM5-3.0 operate without the BYPASS capacitor?

Yes, the LP2985IM5-3.0 functions normally without the BYPASS capacitor, delivering 3.0 V output with standard LDO performance. However, omitting the 10-nF capacitor between BYPASS and GND increases output noise to approximately 115 µV_RMS; the capacitor is required only when the 30 µV_RMS low-noise specification must be met for analog-sensitive circuits.

Is LP2985IM5-3.0 pin-compatible with other LP2985 variants like LP2985IM5-3.3?

Yes, all LP2985IM5-x.x variants share identical SOT-23-5 (DBV) pinout and package dimensions. The LP2985IM5-3.0, LP2985IM5-3.3, and LP2985IM5-5.0 differ only in factory-trimmed output voltage and are fully interchangeable at the board level - allowing voltage scaling without layout changes.

What output capacitor value and type does LP2985IM5-3.0 require for stability?

The LP2985IM5-3.0 requires a minimum 2.2 µF ceramic output capacitor with ESR as low as 5 mΩ for guaranteed stability across 1 mA–150 mA load and –40°C to 125°C. X5R or X7R dielectrics are recommended; capacitance must remain ≥2.2 µF over temperature and bias - avoid Z5U due to high capacitance loss at DC bias.

Does LP2985IM5-3.0 include reverse-voltage protection?

No, the LP2985IM5-3.0 does not include reverse-voltage protection. Its internal PNP pass transistor contains a parasitic diode from IN to OUT; applying reverse polarity (OUT > IN) forward-biases this diode and may cause excessive current flow. External protection - such as a series Schottky diode on the input - is required in systems where reverse input is possible.