Analog Devices Inc. LTC3602EUF#TRPBF

Overview

LTC3602EUF#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter delivering up to 2.5A output current at adjustable 0.6V–9.5V from a 4.5V–10V input. It features 65mΩ top and 90mΩ bottom internal MOSFETs, 1MHz typical switching frequency (300kHz–3MHz programmable), 75μA quiescent current in Burst Mode, and a power-good output. It is used in point-of-load supplies for FPGA, ASIC, and microprocessor core rails.

For engineers reviewing the LTC3602EUF#TRPBF datasheet, LTC3602EUF#TRPBF pinout, LTC3602EUF#TRPBF application, or LTC3602EUF#TRPBF equivalent, key selection considerations include its 20-pin 4mm × 4mm QFN package with exposed SGND pad, OPTI-LOOP® compensation for wide-capacitor stability, selectable Burst Mode vs forced continuous operation, and ±1% 0.6V reference enabling precise low-voltage regulation.

Technical Context

The LTC3602EUF#TRPBF employs constant-frequency current-mode control with internal slope compensation active above 30% duty cycle to prevent subharmonic oscillation. Its dual N-channel synchronous switches are driven by an internal 5V LDO (INTVCC), bootstrapped via BOOST to enable high-side gate drive.

It supports three operating modes via SYNC/MODE pin voltage: forced continuous (≥3.5V), Burst Mode (0.42V–1V), or pulse-skipping (0V). Overtemperature protection shuts down both switches at ~150°C and auto-restarts below 115°C; short-circuit protection limits peak inductor current to 4.5A.

Key Specifications

Pinout & Package

Package: 20-lead (4mm × 4mm) plastic QFN with exposed SGND pad (Pin 21), θ_JA = 37°C/W, rated for –40°C to +85°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54227PWPR and MP2315GJ-Z, the LTC3602EUF#TRPBF delivers superior light-load efficiency via programmable Burst Mode, tighter output accuracy (±1% ref), and robust system integration features (PGOOD, TRACK/SS, synchronization), making it preferred for portable, sequenced, or EMI-sensitive designs.

Availability

LTC3602EUF#TRPBF is available at Aetrix Electronics and suitable for point-of-load supplies, portable instruments, server backplane power, and battery-powered devices requiring stable component supply throughout design-in, prototyping, and volume production.

Supply support for LTC3602EUF#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 technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC3602EUF#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, designed specifically for demanding point-of-load applications requiring precision regulation, low noise, and robust thermal performance in compact packages.

FAQ

What is the maximum output current capability of the LTC3602EUF#TRPBF?

The LTC3602EUF#TRPBF delivers up to 2.5A of continuous output current when properly thermally managed in its 4mm × 4mm QFN package. This rating assumes adequate PCB copper area for the exposed SGND pad, ambient temperature ≤85°C, and input/output conditions within datasheet limits (e.g., VIN = 7V, VOUT = 3.3V). Peak current limit is 4.5A, but sustained 2.5A requires attention to layout and thermal vias.

Does the LTC3602EUF#TRPBF support output voltage tracking for multi-rail systems?

Yes, the LTC3602EUF#TRPBF supports voltage tracking via its TRACK/SS pin. Applying a ramp voltage (e.g., from another regulator's output) to this pin causes the LTC3602EUF#TRPBF's output to follow that ramp until it reaches 0.6V, after which regulation transitions to its internal reference. This enables safe core-I/O sequencing in FPGAs and microprocessors, preventing latch-up during power-up.

How is the switching frequency set on the LTC3602EUF#TRPBF?

The switching frequency of the LTC3602EUF#TRPBF is set by an external resistor (R_RT) connected between the RT pin and PGND. A 105kΩ resistor yields ~1MHz; frequency scales inversely with resistance from 300kHz (R_RT ≈ 300kΩ) to 3MHz (R_RT ≈ 30kΩ). The RT pin sources a precise current to charge an internal capacitor, making frequency highly predictable and stable over temperature.

Can the LTC3602EUF#TRPBF operate with input voltage lower than its output voltage?

No, the LTC3602EUF#TRPBF is a step-down (buck) converter and cannot regulate when PVIN falls below VOUT. However, it supports ultra-low dropout via 99% maximum duty cycle: when VIN approaches VOUT, the top switch remains on for multiple cycles with brief 85ns bottom-switch refreshes to maintain BOOST voltage, allowing operation down to VIN ≈ VOUT + (I_OUT × 65mΩ).

What thermal considerations apply to the LTC3602EUF#TRPBF in high-current applications?

The LTC3602EUF#TRPBF has θ_JA = 37°C/W in its 20-pin QFN package. At 2.5A output with 7V input and 3.3V output, power dissipation is ~1.2W; junction temperature rise is ~44°C above ambient. To stay within the 125°C max junction limit, ambient must remain ≤81°C - achieved via ≥4 thermal vias under the exposed SGND pad and ≥1 in² 2oz copper pour connected to PGND.