Analog Devices Inc. LTC3371HFE#TRPBF

Overview

LTC3371HFE#TRPBF from Analog Devices (formerly Linear Technology) is a configurable 4-channel synchronous buck DC/DC power supply IC with integrated 8×1A power stages, watchdog timer, and power-on reset. It supports input voltages from 2.25V to 5.5V per channel, delivers up to 4A per output via programmable stage combining, and operates at 1MHz–3MHz switching frequency. It is used in automotive infotainment power rails requiring thermal robustness and autonomous sequencing.

For engineers reviewing the LTC3371HFE#TRPBF datasheet, LTC3371HFE#TRPBF pinout, LTC3371HFE#TRPBF application, or LTC3371HFE#TRPBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, CT-programmable watchdog/RST timing, precision enable thresholds (±20mV), 8-stage configurability via C1–C3 pins, and thermally enhanced 38-lead TSSOP package with exposed GND pad.

Technical Context

The LTC3371HFE#TRPBF implements four independent buck regulators sharing eight 1A synchronous power stages, assigned via three binary configuration pins (C1–C3) to support 2-, 3-, or 4-output topologies with per-channel currents from 1A to 4A. Each buck uses internal PMOS/NMOS switches (R_DS(ON) = 300mΩ/240mΩ) and supports Burst Mode® or forced continuous operation.

Its timing subsystem centers on the CT pin: a single capacitor sets watchdog timeout (1.62s), WDO low pulse width (202ms), and RST assertion delay (202ms). The RT pin programs oscillator frequency from 1MHz to 3MHz or selects the default 2MHz internal clock; PLL/MODE enables external synchronization.

Key Specifications

Pinout & Package

The LTC3371HFE#TRPBF is housed in a 38-lead plastic TSSOP package (5mm × 7mm footprint) with exposed GND pad (Pin 39) requiring PCB soldering for thermal performance (θ_JA = 25°C/W). Pin numbering follows standard TSSOP top-view orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-output buck regulator applications.

Compared with LTC3372HFE#TRPBF and TPS65270PWP, the LTC3371HFE#TRPBF uniquely combines 8-stage configurability, –40°C to 150°C operation, and single-capacitor watchdog timing - making it optimal for automotive and high-reliability embedded systems demanding flexibility and thermal resilience.

Availability

LTC3371HFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and medical imaging sensor arrays requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC3371HFE#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 LTC3371 product line delivers configurable multi-output DC/DC regulation for space-constrained, thermally demanding applications where programmability, reliability, and extended temperature operation are critical.

FAQ

What is the maximum output current per channel for LTC3371HFE#TRPBF?

The LTC3371HFE#TRPBF supports up to 4A per output channel by combining four of its eight 1A synchronous power stages. Configuration is set via C1–C3 pins, enabling topologies such as 1×4A, 2×2A, or 4×1A. The actual achievable current depends on thermal design, input voltage, and output voltage - with full 4A sustained at 150°C junction temperature in the TSSOP package when properly heatsinked.

Does LTC3371HFE#TRPBF support external frequency synchronization?

Yes, the LTC3371HFE#TRPBF supports external frequency synchronization via the PLL/MODE pin. When driven with a logic-level square wave (t_LOW/t_HIGH > 60ns), it locks to input frequencies from 1MHz to 3MHz. This feature enables EMI reduction by aligning switching noise to noncritical frequency bands and facilitates multi-rail coherence in complex systems.

How does the CT pin affect RST timing in LTC3371HFE#TRPBF?

The CT pin on the LTC3371HFE#TRPBF sets the timing for all RST pins (RST1–RST4), WDO assertion, and watchdog timeout. With a 10nF capacitor, RST assertion delay is 202ms - meaning the pin goes low 202ms after the regulated output falls >5% below target. Scaling CT linearly adjusts this delay, allowing precise alignment with system fault-handling requirements without additional circuitry.

What is the purpose of the C1–C3 pins on LTC3371HFE#TRPBF?

The C1–C3 pins on the LTC3371HFE#TRPBF are binary configuration inputs that define how its eight 1A power stages are grouped into 2, 3, or 4 output channels. These pins accept static logic levels (VCC or GND) to select one of eight possible configurations - for example, C1=C2=C3=0 configures two 4A outputs, while C1=C2=1, C3=0 yields three outputs (2A/3A/3A). No software or EEPROM is required.

Can LTC3371HFE#TRPBF operate with different input voltages on each VIN pin?

Yes, the LTC3371HFE#TRPBF is explicitly designed for independent input supplies: VINA–VINH each accept 2.25V to 5.5V and must be bypassed individually with ≥10µF ceramic capacitors. This enables mixed-input architectures - such as powering high-current channels from a 5V bus while supplying noise-sensitive rails from a cleaner 3.3V source - improving PSRR and reducing inter-rail coupling.