Analog Devices Inc. LT3050MPMSE-5#PBF

Overview

LT3050MPMSE-5#PBF from Analog Devices (formerly Linear Technology) is a 100mA, 5V fixed-output low-dropout linear regulator with ±45V input rating, precision programmable current limit (±5%), and integrated diagnostic outputs including FAULT pin and IMON current monitor (1/100× I_OUT). It delivers robust protection in automotive telematics and industrial power rails where reverse-battery, reverse-output, thermal shutdown, and open-circuit detection are critical.

For engineers reviewing the LT3050MPMSE-5#PBF datasheet, LT3050MPMSE-5#PBF pinout, LT3050MPMSE-5#PBF application, or LT3050MPMSE-5#PBF equivalent, key selection considerations include its –55°C to 125°C extended temperature grade, 340mV dropout at 100mA, 30μV_RMS output noise (10Hz–100kHz), and dual resistor-programmable fault thresholds for current limit and minimum output current.

Technical Context

The LT3050MPMSE-5#PBF implements a precision bandgap reference with soft-start via REF/BYP pin, enabling controlled turn-on and low-noise operation when paired with a 10nF capacitor. Its FAULT pin asserts logic-low on three independent conditions: current limiting, thermal shutdown, or output current falling below the IMIN threshold - all independently programmable via external resistors tied to IMAX and IMIN pins.

Stability is optimized for ceramic output capacitors ≥2.2μF with low ESR; no compensation network is required. The device features reverse-battery protection (±45V IN rating), reverse-output protection (0.2μA leakage at V_OUT = 1.2V), and reverse-current blocking - eliminating need for external diodes in harsh supply environments.

Key Specifications

Pinout & Package

LT3050MPMSE-5#PBF is housed in a thermally enhanced 12-lead MSOP package (3mm × 2mm) with exposed GND pad (Pin 13) requiring PCB soldering for thermal performance and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT3050EMSE-5#PBF, the LT3050MPMSE-5#PBF adds guaranteed operation down to –55°C - essential for cold-climate deployments - while matching all electrical performance. Against LT3050IDDB-5#PBF, it trades slightly higher θ_JA for MSOP manufacturability and established test infrastructure.

Availability

LT3050MPMSE-5#PBF is available at Aetrix Electronics and suitable for automotive telematics, industrial truck electronics, and protected antenna supplies requiring stable component supply across extended temperature ranges and high-reliability fault reporting.

Supply support for LT3050MPMSE-5#PBF 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 IC portfolio with rigorous automotive and industrial qualification standards.

The LT3050 series is designed for robust, fault-aware power management in harsh environments - emphasizing precision current limiting, diagnostic visibility, and wide-input survivability over basic voltage regulation.

FAQ

What is the guaranteed operating temperature range for LT3050MPMSE-5#PBF?

The LT3050MPMSE-5#PBF is 100% tested and guaranteed over a junction temperature range of –55°C to 125°C. This extended low-temperature rating distinguishes it from commercial-grade variants like LT3050EMSE-5#PBF (–40°C to 125°C) and supports deployment in arctic, aerospace, and under-hood automotive applications where cold-start reliability is mandatory. The MP grade undergoes additional screening to ensure parametric stability at extreme lows.

How do I configure the current limit for LT3050MPMSE-5#PBF?

To set the current limit for LT3050MPMSE-5#PBF, connect a resistor (R_IMAX) between the IMAX pin (Pin 8) and GND. For a 100mA limit, use 1.15kΩ (±1%); for 72mA, use 1.5kΩ; for 49mA, use 2.26kΩ. The relationship is R_IMAX = 115kΩ / I_LIM(mA). The LT3050MPMSE-5#PBF achieves ±5% accuracy over temperature and input voltage, and the FAULT pin asserts low when this threshold is exceeded.

Does LT3050MPMSE-5#PBF require an external capacitor on the REF/BYP pin?

Yes - a 10nF capacitor from REF/BYP (Pin 1) to GND is required to achieve the specified 30μV_RMS output noise (10Hz–100kHz) and controlled soft-start behavior. Without it, noise rises to 90μV_RMS, and startup becomes uncontrolled. If low noise or soft-start is not needed, the pin may be left floating, but performance degrades significantly. Driving REF/BYP with active circuitry is prohibited.

Can LT3050MPMSE-5#PBF operate with input voltages below 5V?

Yes - the LT3050MPMSE-5#PBF supports input voltages as low as 1.6V, but regulation requires VIN ≥ VOUT + dropout voltage. At 100mA, dropout is 340mV, so minimum functional input is 5.34V. Below that, output voltage drops linearly (V_OUT = V_IN – V_DROPOUT). For sub-5V operation, the adjustable LT3050MPMSE#PBF (0.6V reference) is recommended instead of the fixed 5V variant.

What protection features does LT3050MPMSE-5#PBF provide beyond standard LDO functionality?

LT3050MPMSE-5#PBF provides reverse-battery protection (±45V on IN), reverse-output protection (0.2μA leakage at V_OUT = 1.2V), reverse-current blocking, thermal shutdown with FAULT indication, and programmable open-circuit detection via IMIN. Unlike basic LDOs, it integrates three independent fault conditions into one open-drain FAULT pin and includes a precision 1/100× current monitor - eliminating need for five discrete protection components in typical implementations.