Analog Devices Inc. LTC3411EMS#TRPBF

Overview

LTC3411EMS#TRPBF from Analog Devices (formerly Linear Technology) is a 1.25A, 4MHz synchronous step-down DC/DC converter in a 10-lead MSOP package. It operates from 2.63V to 5.5V input, delivers adjustable output (0.8V–5V), features 0.11Ω internal MOSFETs, 95% peak efficiency, and Burst Mode® for ultra-low quiescent current (60μA active, ≤1μA shutdown). It powers compact portable electronics requiring high-density, low-noise power conversion.

For engineers reviewing the LTC3411EMS#TRPBF datasheet, LTC3411EMS#TRPBF pinout, LTC3411EMS#TRPBF application, or LTC3411EMS#TRPBF equivalent, key selection criteria include its 4MHz switching capability enabling sub-2mm-height magnetics, current-mode control for fast transient response, selectable operating modes (Burst/Pulse-Skip/Forced Continuous), and dual-purpose SYNC/MODE and SHDN/RT pins for system-level power sequencing and noise management.

Technical Context

The LTC3411EMS#TRPBF employs a constant-frequency current-mode architecture with external compensation via the ITH pin, enabling optimization of loop stability across wide load and output capacitance ranges. Its dual-MOSFET synchronous rectification uses P-channel high-side and N-channel low-side switches with matched 0.11Ω R_DS(ON) at 3.3V, supporting 1.6A peak switch current and 100% duty-cycle dropout operation.

Mode control is implemented through the multifunction SYNC/MODE pin: tied to SVIN for Burst Mode (efficiency-optimized), grounded for pulse-skipping (low-ripple), or biased at mid-SVIN for forced continuous conduction (fixed-frequency EMI control). The SHDN/RT pin simultaneously sets oscillator frequency via external resistor and enables logic-level shutdown with digital soft-start over 1024 clock cycles.

Key Specifications

Pinout & Package

Package: 10-Lead Plastic MSOP (3mm × 3mm), exposed pad soldered to SGND for thermal and electrical performance. θ_JA = 120°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3411EMS#TRPBF uniquely balances ultra-high 4MHz switching, full 0.8V–5V adjustability, and dual-mode pin functionality (SYNC/MODE, SHDN/RT) in a compact MSOP - making it optimal for space-constrained, battery-sensitive portable designs demanding both efficiency and EMI control.

Availability

LTC3411EMS#TRPBF is available at Aetrix Electronics and suitable for notebook computers, digital cameras, cellular phones, handheld instruments, and board-mounted power supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for LTC3411EMS#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC3411EMS#TRPBF belongs to ADI's Power by Linear™ family of high-frequency DC/DC converters, designed specifically for portable, battery-powered, and space-constrained applications where efficiency, small solution size, and low-noise operation are critical.

FAQ

What is the maximum supported switching frequency for the LTC3411EMS#TRPBF?

The LTC3411EMS#TRPBF supports up to 4MHz switching frequency, achieved by selecting an appropriate RT resistor or synchronizing to an external clock. While 4MHz operation is guaranteed by design, production testing is performed at 1MHz; actual usable frequency depends on minimum on-time and duty cycle constraints per the formula f_O(MAX) ≈ 6.67 × (V_OUT/V_IN(MAX)) MHz. At V_OUT = 2.5V and V_IN = 5.5V, this yields ~3MHz practical limit.

How does the LTC3411EMS#TRPBF achieve high efficiency at light loads?

The LTC3411EMS#TRPBF achieves high light-load efficiency via Burst Mode® operation, which intermittently activates the main control loop only when needed to maintain output regulation. This reduces gate charge losses by disabling switching until output droop triggers a new burst cycle. Quiescent current drops to 60μA in active Burst Mode and ≤1μA in shutdown - verified across –40°C to 85°C for the EMS grade.

Can the LTC3411EMS#TRPBF operate with ceramic capacitors only?

Yes, the LTC3411EMS#TRPBF is explicitly designed to be stable with ceramic input and output capacitors. Its current-mode architecture and external compensation via the ITH pin allow robust loop tuning even with ultra-low-ESR ceramics. However, layout care is essential: use X5R/X7R dielectrics, separate SGND/PGND planes, minimize SW node area, and add 0.1μF–1μF high-frequency bypass caps close to PVIN and VOUT pins.

What is the function of the ITH pin on the LTC3411EMS#TRPBF?

The ITH pin on the LTC3411EMS#TRPBF serves as the error amplifier output and primary compensation node. It sets the peak inductor current threshold via voltage level (0V–1.5V range), directly controlling duty cycle. An external RC network from ITH to SGND sets loop bandwidth and phase margin. Additionally, ramping ITH at startup extends soft-start time beyond the default 1024-cycle digital ramp, enabling controlled power-up sequencing.

Does the LTC3411EMS#TRPBF support power-good signaling?

Yes, the LTC3411EMS#TRPBF provides a dedicated open-drain PGOOD pin (Pin 8) that pulls low when the regulated output voltage deviates by more than ±7.5% from the target. This signal is referenced to SGND and can drive logic inputs or enable downstream regulators. PGOOD assertion timing is synchronized to the internal control loop and remains valid during all operating modes including Burst Mode and dropout.