Analog Devices Inc. LTC3371EUHF#TRPBF

Overview

LTC3371EUHF#TRPBF from Analog Devices (formerly Linear Technology) is a configurable 4-channel synchronous buck DC/DC power supply IC with integrated watchdog and power-on reset. It combines eight 1A power stages (configurable as 1–4 outputs, 1–4A per channel), supports independent 2.25V–5.5V input supplies per buck, and delivers up to 8A total output current. It is used in automotive infotainment power rails, industrial PLC I/O modules, and distributed power systems requiring flexible, low-noise multichannel regulation.

For engineers reviewing the LTC3371EUHF#TRPBF datasheet, LTC3371EUHF#TRPBF pinout, LTC3371EUHF#TRPBF application, or LTC3371EUHF#TRPBF equivalent, key selection criteria include programmable output configuration via C1–C3 pins, CT-programmed watchdog timing, independent RST pin assertion for each buck, thermal monitoring via TEMP pin, and 90° phase interleaving to reduce input ripple.

Technical Context

The LTC3371EUHF#TRPBF implements four synchronous buck regulators sharing eight discrete 1A power stages, with configuration determined by logic levels on C1–C3 pins - enabling 8 distinct output configurations (e.g., 1×4A, 2×2A+2×1A, 4×2A). Each buck uses internal PMOS/NMOS switches with typical R_DS(ON) of 300mΩ (PMOS) and 240mΩ (NMOS).

Its timing architecture integrates a programmable oscillator (1–3MHz via RT resistor or PLL sync), a CT-pin-controlled watchdog timer with WDI/WDO interface, and four independent RST pins whose assertion delay and timeout are scaled by the same CT capacitor. The device also provides die temperature sensing via a linear 7mV/°C TEMP voltage output.

Key Specifications

Pinout & Package

Package: 38-lead 5mm × 7mm plastic QFN (UHF) with exposed GND pad (Pin 39), rated for –40°C to 125°C operating junction temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC3372EUHF#TRPBF, the LTC3371EUHF#TRPBF trades I²C configurability for lower BOM cost and zero-firmware dependency; versus TPS65270PWP, it delivers superior flexibility in output configuration, integrated watchdog timing, and per-channel RST signaling - critical for functional safety and field-upgradeable designs.

Availability

LTC3371EUHF#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power modules, and distributed telecom equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC3371EUHF#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 power management portfolio with rigorous automotive and industrial qualification standards.

The LTC3371EUHF#TRPBF belongs to the LTC® multichannel buck regulator family, designed specifically for space-constrained, thermally demanding applications requiring flexible output configuration, integrated system supervision, and robust fault reporting.

FAQ

What is the maximum output current capability of the LTC3371EUHF#TRPBF?

The LTC3371EUHF#TRPBF supports up to 8A total output current by combining its eight internal 1A synchronous buck power stages. Output current per channel depends on configuration: e.g., 1×4A, 2×3A, 3×2.67A, or 4×2A. The actual achievable current is limited by thermal design, PCB copper area, and input voltage - with 4A per channel validated at 3.3V_IN/1.8V_OUT in forced continuous mode.

How does the C1–C3 pin configuration work on the LTC3371EUHF#TRPBF?

The C1–C3 pins on the LTC3371EUHF#TRPBF are binary-encoded hardware inputs that select one of eight predefined power-stage allocations across up to four output channels. For example, C1=C2=C3=0 configures four 2A outputs; C1=C2=1, C3=0 yields one 4A, one 2A, and two 1A outputs. Configuration is latched at power-up and remains static until reset - no software or I²C interface is involved.

What is the function of the CT pin on the LTC3371EUHF#TRPBF?

The CT pin on the LTC3371EUHF#TRPBF connects to a capacitor that sets the timebase for three independent functions: the watchdog timeout window (tWDI), the WDO low-pulse duration (tWDO), and the assertion delay of all four RST pins (tRST). With a 10nF capacitor, these values are 1.62s, 202ms, and 202ms respectively - enabling precise, single-component timing control without external RC networks.

Does the LTC3371EUHF#TRPBF support synchronization to an external clock?

Yes, the LTC3371EUHF#TRPBF supports external clock synchronization via the PLL/MODE pin. When driven with a TTL/CMOS clock signal between 1MHz and 3MHz, the internal oscillator locks to the external frequency - enabling phase alignment across multiple LTC3371EUHF#TRPBF devices or with system clocks to reduce beat frequencies and EMI peaks.

What thermal protection features does the LTC3371EUHF#TRPBF include?

The LTC3371EUHF#TRPBF includes overtemperature shutdown at 170°C (with 10°C hysteresis) and a linear TEMP pin output (7mV/°C slope) for real-time die temperature monitoring. Unlike simple shutdown-only ICs, the TEMP pin allows predictive thermal management - e.g., reducing switching frequency or disabling noncritical rails before reaching the 170°C trip point - preserving system uptime under transient thermal loads.