Analog Devices Inc. LT3015MPMSE#TRPBF

Overview

LT3015MPMSE#TRPBF from Analog Devices (formerly Linear Technology) is a -5V, 1.5A negative low-dropout linear regulator in a thermally enhanced 12-lead MSOP package, featuring 310mV typical dropout voltage, 60µVRMS output noise (10Hz–100kHz), and precision current limit with foldback. It delivers stable bias for analog front-ends in industrial instrumentation and post-regulation of switching supplies.

For engineers reviewing the LT3015MPMSE#TRPBF datasheet, LT3015MPMSE#TRPBF pinout, LT3015MPMSE#TRPBF application, or LT3015MPMSE#TRPBF equivalent, key selection criteria include its -55°C to 125°C operating junction temperature range, reverse output protection, controlled quiescent current in dropout (1.1mA typ), and compatibility with 10µF ceramic output capacitors without added ESR.

Technical Context

The LT3015MPMSE#TRPBF implements a precision bandgap reference and high-gain error amplifier to regulate negative output voltage with tight line and load regulation (≤5.5mV and ≤7.5mV respectively). Its internal foldback current limit activates at |VIN – VOUT| ≥ 8V, providing fault protection while maintaining operation across wide input ranges (–1.8V to –30V).

Thermal management is enabled by an exposed pad tied to IN and optimized thermal resistance (qJA = 37°C/W, qJC = 10°C/W). Shutdown logic uses precision positive/negative thresholds (e.g., –1.34V off-to-on), and the SENSE/ADJ pin supports both fixed-output (-5V) and adjustable configurations via external resistor divider.

Key Specifications

Pinout & Package

LT3015MPMSE#TRPBF is housed in a 12-lead plastic MSOP package with exposed pad (Pin 13) electrically connected to IN and requiring PCB soldering for thermal performance. The package measures 3mm × 3mm × 1.1mm and supports surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar negative linear regulator applications.

Compared with LTC3015EMSE-5#TRPBF and LT3015IMSE-5#TRPBF, the LT3015MPMSE#TRPBF provides verified 100% testing across the full –55°C to 125°C range-critical for aerospace, defense, and deep-cold industrial deployments where marginal operation cannot be tolerated.

Availability

LT3015MPMSE#TRPBF is available at Aetrix Electronics and suitable for industrial instrumentation, aerospace avionics, and telecom infrastructure requiring stable component supply across extreme temperature profiles, long-term obsolescence resilience, and traceable sourcing.

Supply support for LT3015MPMSE#TRPBF 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

Analog Devices acquired Linear Technology in 2017 and maintains its high-performance analog product lines with rigorous qualification standards.

The LT3015 series belongs to Linear's precision negative LDO family, designed specifically for noise-sensitive analog systems requiring robust fault protection, wide input range, and operation in harsh thermal environments.

FAQ

What is the minimum input voltage required for LT3015MPMSE#TRPBF to maintain regulation at –5V output?

The LT3015MPMSE#TRPBF requires a minimum input voltage of –5.5V to sustain –5V output at full 1.5A load, based on its 310mV typical dropout voltage. At lighter loads (e.g., –1mA), regulation holds down to –5.055V input. This ensures reliable startup and operation in systems with tightly constrained negative rail margins.

Does LT3015MPMSE#TRPBF require an external capacitor on the SENSE/ADJ pin for stability?

No, the LT3015MPMSE#TRPBF does not require an external capacitor on the SENSE/ADJ pin. Stability is ensured with only a minimum 10µF ceramic output capacitor-no ESR or feedforward capacitor is mandatory. A 10nF feedforward capacitor may optionally improve ripple rejection at higher frequencies but is not needed for basic stability.

How does the precision current limit with foldback function in LT3015MPMSE#TRPBF during a short-circuit event?

In the LT3015MPMSE#TRPBF, the precision current limit begins at 1.7A and folds back to ~1.2A when |VIN – VOUT| reaches 8V. During a short circuit (VOUT ≈ 0V), the device limits current to ~1.7A initially, then reduces it progressively as input voltage rises-limiting power dissipation and enabling safe operation without thermal shutdown in many cases.

Can LT3015MPMSE#TRPBF be used with tantalum or aluminum electrolytic output capacitors?

Yes, the LT3015MPMSE#TRPBF is stable with tantalum or aluminum electrolytic capacitors (≥10µF), in addition to ceramic types. Unlike many older LDOs, it does not require a minimum ESR, eliminating the need for series resistors or specialized capacitor selection-reducing design complexity and bill-of-materials cost.

What is the role of the exposed pad (Pin 13) on the LT3015MPMSE#TRPBF MSOP package?

The exposed pad (Pin 13) on the LT3015MPMSE#TRPBF is electrically connected to the IN terminal and must be soldered to a PCB copper pour for effective thermal conduction. With qJA = 37°C/W and qJC = 10°C/W, proper pad soldering is essential to maintain junction temperature below 125°C under 1.5A load, especially in enclosed or high-ambient environments.