Analog Devices Inc. LT1963AIFE#TRPBF

Overview

LT1963AIFE#TRPBF from Analog Devices (formerly Linear Technology) is a 1.5A, low-noise, fast-transient-response LDO regulator in a 16-lead TSSOP package with exposed GND pad. It delivers fixed 3.3V output, features 340mV dropout at 1.5A, 40µVRMS output noise (10Hz–100kHz), and stable operation with ≥10µF ceramic or tantalum output capacitors. It is used in RF power supply rails where clean, tightly regulated voltage is critical.

For engineers reviewing the LT1963AIFE#TRPBF datasheet, LT1963AIFE#TRPBF pinout, LT1963AIFE#TRPBF application, or LT1963AIFE#TRPBF equivalent, key selection criteria include guaranteed 3.3V output accuracy (±2.5% over temperature/load), controlled quiescent current (1mA active, <1µA shutdown), reverse battery protection, no reverse current flow, and thermal limiting - all validated for industrial temperature range (–40°C to +125°C).

Technical Context

The LT1963AIFE#TRPBF implements a PNP-based pass transistor architecture optimized for fast load transient response without external compensation. Its error amplifier uses Kelvin-sense feedback via Pin 6 (SENSE/ADJ) to reject PCB trace resistance effects, enabling precise regulation at the load point.

It integrates reverse-battery protection that blocks input reversal up to ±20V, prevents reverse current from OUT to IN, and maintains regulation even when V_OUT is pulled below ground by up to 20V - critical for dual-supply and battery-backup systems. Shutdown threshold is asymmetric: 0.25V (off-to-on) and 0.90V (on-to-off), ensuring noise-immune enable control.

Key Specifications

Pinout & Package

LT1963AIFE#TRPBF is housed in a 16-lead plastic TSSOP package (FE package) with an exposed thermal pad (Pin 17) that must be soldered to PCB GND for thermal performance and electrical stability. The package supports high-density layouts and offers θ_JA = 38°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and MCP1826-3302E/DB, the LT1963AIFE#TRPBF uniquely combines 1.5A current, 340mV dropout, 40µVRMS noise, reverse-battery protection, and fixed 3.3V output in a thermally enhanced TSSOP - making it optimal for space-constrained, battery-critical, and RF-sensitive designs where reliability and noise performance are non-negotiable.

Availability

LT1963AIFE#TRPBF is available at Aetrix Electronics and suitable for RF power supply, industrial PLC I/O modules, and battery-powered sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.

Supply support for LT1963AIFE#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 portfolio, emphasizing precision, reliability, and ruggedness for demanding applications.

The LT1963A series was designed specifically for high-current, low-noise, fast-transient LDO regulation in battery-powered, RF, and industrial systems - prioritizing robust protection, minimal external components, and guaranteed performance across extreme temperatures.

FAQ

What is the output voltage tolerance of the LT1963AIFE#TRPBF over temperature and load?

The LT1963AIFE#TRPBF provides a fixed 3.3V output with ±2.5% tolerance across the full industrial temperature range (–40°C to +125°C) and load current from 1mA to 1.5A. This specification is guaranteed per the datasheet's Electrical Characteristics table and applies under conditions where input voltage remains above minimum required (≥4.3V for full 1.5A load).

Does the LT1963AIFE#TRPBF require an external capacitor on the SENSE pin?

No, the LT1963AIFE#TRPBF does not require an external capacitor on the SENSE pin. For this fixed 3.3V variant, Pin 2 (SENSE) is intended for Kelvin sensing and is typically connected directly to the OUT pin (or to the load point). No bypass or filtering capacitor is specified or needed at the SENSE pin in the official LT1963A datasheet.

Can the LT1963AIFE#TRPBF operate with a 10µF ceramic output capacitor?

Yes, the LT1963AIFE#TRPBF is explicitly characterized and guaranteed stable with a 10µF ceramic output capacitor - a key differentiator from many older LDOs requiring higher ESR or larger capacitance. This enables compact, high-reliability designs without electrolytic or tantalum components.

What is the maximum allowable input voltage for the LT1963AIFE#TRPBF?

The absolute maximum input voltage for the LT1963AIFE#TRPBF is ±20V on the IN pin relative to GND, per Absolute Maximum Ratings. However, for reliable operation, input voltage must remain within the recommended range: 4.3V ≤ VIN ≤ 20V for full 1.5A output at 3.3V, with minimum input rising to ~4.8V at elevated temperature or max load to maintain regulation.

Is the exposed pad (Pin 17) on the LT1963AIFE#TRPBF electrically connected, and how must it be handled?

Yes, the exposed pad (Pin 17) on the LT1963AIFE#TRPBF is electrically connected to GND and serves both thermal and electrical functions. It must be soldered to a PCB copper area tied to the main GND plane. Omitting this connection degrades thermal performance (θ_JA increases significantly) and may cause instability or premature thermal shutdown during sustained 1.5A operation.