Analog Devices Inc. LTC3633AEFE-1#TRPBF

Overview

LTC3633AEFE-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel monolithic synchronous step-down regulator with 3A per channel, 3.6V–20V input range, and adjustable 500kHz–4MHz switching frequency. It features phase-selectable operation (0°/180°), Burst Mode® for high light-load efficiency, and integrated power good outputs - deployed in point-of-load power supplies for FPGA, ASIC, and DSP core voltage regulation.

For engineers reviewing the LTC3633AEFE-1#TRPBF datasheet, LTC3633AEFE-1#TRPBF pinout, LTC3633AEFE-1#TRPBF application, or LTC3633AEFE-1#TRPBF equivalent, key selection criteria include its 1.5V–12V VON sense range (distinguishing it from LTC3633A), dual-channel interleaved operation, thermal performance in TSSOP-28, and compatibility with external synchronization and soft-start tracking.

Technical Context

The LTC3633AEFE-1#TRPBF implements a controlled on-time, current-mode architecture with internal phase-locked loop (PLL) servoing to maintain constant frequency across line/load transients. Its two channels support selectable 0° or 180° phase shift, enabling interleaved operation that reduces input RMS current and eases input capacitor sizing.

It integrates dual 130mΩ/65mΩ MOSFETs per channel, 0.6V reference (±1% over temperature), and independent RUN/PGOOD/ITH/TRACKSS pins per channel. The VON1/VON2 inputs accept 1.5V–12V for on-time scaling - a defining functional difference versus the standard LTC3633A (0.6V–6V range) - enabling stable high-VOUT regulation without frequency deviation.

Key Specifications

Pinout & Package

Package: 28-Lead Plastic TSSOP (FE package), 4mm × 9.7mm footprint, exposed PGND pad (Pin 29) requiring PCB soldering for thermal and electrical integrity. θJA = 30°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.

Compared with LTC3633AEFE-1#TRPBF, the QFN variant offers better thermal resistance but demands more complex assembly, while the MP2491DS-LF-Z sacrifices integration, sequencing, and efficiency features - making LTC3633AEFE-1#TRPBF the optimal choice for compact, thermally managed, dual-rail industrial and medical power designs.

Availability

LTC3633AEFE-1#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, FPGA-based test equipment, medical imaging subsystems, and automotive ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC3633AEFE-1#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC3633A family was designed for high-efficiency, dual-channel point-of-load regulation in space- and thermal-constrained systems - emphasizing precision, integration, and robustness for mission-critical embedded power applications.

FAQ

What distinguishes LTC3633AEFE-1#TRPBF from the standard LTC3633A?

The LTC3633AEFE-1#TRPBF uses the -1 variant's 1.5V–12V VON sense range (vs. 0.6V–6V in LTC3633A), enabling stable high-output-voltage regulation without frequency deviation. It shares identical pinout, package (TSSOP-28), and all other electrical specs with the base LTC3633A, making it a direct replacement where higher VOUT is required.

Does LTC3633AEFE-1#TRPBF support external synchronization, and how is it implemented?

Yes, LTC3633AEFE-1#TRPBF supports external synchronization via the MODE/SYNC pin. Applying a clean clock signal (CMOS/TTL compatible) to this pin locks the internal PLL to the external source, forcing forced continuous mode and aligning switching edges - essential for EMI reduction in multi-converter systems.

How does the 180° phase shift feature improve system-level performance in LTC3633AEFE-1#TRPBF?

When configured for 180° phase shift via PHMODE = INTVCC, LTC3633AEFE-1#TRPBF interleaves channel switching, halving input current ripple frequency and reducing RMS input current by up to 30%. This relaxes input capacitor requirements and lowers conducted EMI on shared supply rails.

Can LTC3633AEFE-1#TRPBF operate with only one channel enabled?

Yes, LTC3633AEFE-1#TRPBF supports independent channel control: pulling RUN1 low disables Channel 1 while Channel 2 remains fully operational, and vice versa. Both channels retain full functionality - including PGOOD, soft-start, and compensation - when used singly.

What thermal considerations apply to the TSSOP-28 package of LTC3633AEFE-1#TRPBF?

The LTC3633AEFE-1#TRPBF in TSSOP-28 has θJA = 30°C/W. To maintain safe junction temperature, the exposed PGND pad (Pin 29) must be soldered to a minimum 200mm² copper area with ≥4 thermal vias (0.3mm diameter) to inner/ground planes. Ambient temperature must stay ≤85°C at 3A/channel full load.