Analog Devices Inc. LT3048EDC-3.3#TRMPBF

Overview

LT3048EDC-3.3#TRMPBF from Analog Devices is a dual-stage low-noise bias generator integrating a 2.2MHz boost regulator and a fixed 3.3V LDO linear regulator in an 8-lead 2mm × 2mm DFN package. It delivers up to 40mA output current with <500µV_P-P output ripple, <120µV_RMS (10Hz–100kHz) noise, and 9mV load regulation across 100µA–40mA - optimized for powering precision analog sensors and op amps from single-cell Li-ion batteries (2.7V–4.8V).

For engineers reviewing the LT3048EDC-3.3#TRMPBF datasheet, LT3048EDC-3.3#TRMPBF pinout, LT3048EDC-3.3#TRMPBF application, or LT3048EDC-3.3#TRMPBF equivalent, key selection criteria include its fixed 3.3V LDO output, integrated Schottky diode, BSTOUT-to-LDOOUT regulation at +1.1V, 2.2MHz switching frequency, and thermal/short-circuit protection - all validated for industrial temperature range (–40°C to 125°C).

Technical Context

The LT3048EDC-3.3#TRMPBF employs peak current-mode control in its boost stage, enabling stable operation with small inductors (3.3µH recommended) and predictable ripple. Its BSTOUT output is regulated precisely 1.1V above LDOOUT, minimizing voltage headroom while maximizing PSRR and transient response of the downstream LDO.

The fixed-output LDO stage uses internal feedback to maintain 3.300V ±0.050V (typical 3.300V, min 3.250V, max 3.350V at 100µA–40mA), with 0.1% load regulation and 14–20µA quiescent current supplied from BSTOUT. Shutdown disconnects the load and reduces IQ to <1µA.

Key Specifications

Pinout & Package

LT3048EDC-3.3#TRMPBF is housed in an 8-lead 2mm × 2mm plastic DFN package with exposed thermal pad (Pin 9, GND). The package requires soldering of the exposed pad to PCB ground for thermal and electrical integrity (θ_JA = 102°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise bias generation applications.

Compared with LT3048EDC-3.3#TRPBF, the #TRMPBF variant offers identical performance in a smaller 500-unit reel ideal for design-in and qualification. Against LT3009EDC-3.3#TRMPBF, the LT3048EDC-3.3#TRMPBF uniquely enables 3.3V bias from sub-3.3V sources - a critical differentiator for portable and battery-operated systems.

Availability

LT3048EDC-3.3#TRMPBF is available at Aetrix Electronics and suitable for high-precision sensor biasing, portable medical instrumentation, and industrial analog I/O modules requiring stable component supply with guaranteed long-term availability.

Supply support for LT3048EDC-3.3#TRMPBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LT3048 series was designed specifically for low-noise, high-PSRR bias generation in space-constrained, battery-powered systems - combining boost and LDO regulation to extend runtime and signal fidelity in precision analog applications.

FAQ

What is the output voltage tolerance of the LT3048EDC-3.3#TRMPBF over temperature and load?

The LT3048EDC-3.3#TRMPBF delivers a fixed 3.300V output with guaranteed tolerance of ±0.050V (3.250V to 3.350V) across the full –40°C to 125°C junction temperature range and 100µA to 40mA load current. At 25°C and 100µA load, typical output is 3.300V; load regulation adds ≤9mV deviation at 40mA, ensuring tight accuracy for 3.3V logic and analog interfaces.

Does the LT3048EDC-3.3#TRMPBF require external compensation components?

No, the LT3048EDC-3.3#TRMPBF is internally compensated and requires no external compensation components. Its LDO stage is stable with any ≥1µF low-ESR output capacitor (ceramic, tantalum, or low-ESR electrolytic), and the boost regulator uses peak current-mode control with built-in slope compensation - simplifying design and reducing bill-of-materials cost.

How does the BYP pin function in the LT3048EDC-3.3#TRMPBF, and what value capacitor should be used?

The BYP pin on the LT3048EDC-3.3#TRMPBF accepts an optional capacitor between LDOOUT and BYP to reduce output noise and improve transient response. A 1nF ceramic capacitor is recommended: it lowers RMS noise from 120µV to 42µV (typical) and provides soft-start behavior, though it increases startup time. Leaving BYP unconnected maintains fastest startup but higher noise floor.

What is the minimum inductor value required for stable operation of the LT3048EDC-3.3#TRMPBF?

The LT3048EDC-3.3#TRMPBF is optimized for a 3.3µH inductor (e.g., Würth WE-LHMI4020 or Coilcraft XAL4020-332MEB). Using this value ensures ≥40mA output current at 3.6V input and meets efficiency targets (e.g., 70% at 20mA, VIN=3.6V). Smaller inductors reduce maximum load current and increase ripple; larger values improve current capability but add size and cost without significant benefit.

Can the LT3048EDC-3.3#TRMPBF operate from a 2.5V input source?

No, the LT3048EDC-3.3#TRMPBF has a specified minimum input voltage of 2.7V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.7V may result in unstable boost regulation, reduced output current, or failure to start - particularly at cold temperatures. For 2.5V input compatibility, consider the LT3095 (wider VIN range: 3V–20V) or redesign with a pre-regulator stage.