Analog Devices Inc. LTC3371EFE#TRPBF

Overview

LTC3371EFE#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, programmable output configurations (1–4 channels, 1–4A per channel), 2.25V–5.5V input range per stage, and watchdog/power-on-reset functions. It serves as a multichannel PMIC in automotive infotainment and industrial control systems requiring precise sequencing and thermal monitoring.

For engineers reviewing the LTC3371EFE#TRPBF datasheet, LTC3371EFE#TRPBF pinout, LTC3371EFE#TRPBF application, or LTC3371EFE#TRPBF equivalent, key selection criteria include its 38-pin TSSOP package, CT-programmable watchdog timing, independent VIN supplies per buck stage, precision enable thresholds (±20mV), and 2MHz default switching frequency with RT resistor or PLL synchronization.

Technical Context

The LTC3371EFE#TRPBF implements eight discrete 1A synchronous buck power stages that are software-agnostic and pin-configured via C1–C3 into 2A/3A/4A per channel outputs. Each buck uses internal PMOS/NMOS switches (R_DS(ON) = 300mΩ/240mΩ) and supports Burst Mode® for ultra-low-noise light-load operation.

Its timing architecture centers on the CT pin, which sets watchdog timeout (1.62s typical), RST assertion delay (160–240ms), and WDO low pulse width (160–280ms) using a single external capacitor. The RT pin enables oscillator frequency programming from 1MHz to 3MHz or PLL synchronization, while phased 90° switching reduces input ripple.

Key Specifications

Pinout & Package

The LTC3371EFE#TRPBF is housed in a thermally enhanced 38-lead plastic TSSOP package (5mm × 7mm footprint, exposed pad GND). Pin count and mechanical dimensions match the QFN variant, enabling dual-source board design.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC3372EFE#TRPBF, the LTC3371EFE#TRPBF offers identical power-stage flexibility and thermal performance but lacks I²C control-making it ideal for static-configured, safety-critical systems. Versus TPS65270PWP, it provides superior configurability and supervision at the cost of higher BOM count for external timing components.

Availability

LTC3371EFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC modules, and medical point-of-care monitors requiring stable component supply, extended temperature support (–40°C to 125°C), and long-term lifecycle assurance.

Supply support for LTC3371EFE#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-reliability analog and power management portfolio with rigorous automotive and industrial qualification standards.

The LTC3371EFE#TRPBF belongs to Linear's configurable multichannel PMIC family, designed specifically for space-constrained systems needing flexible, supervisor-equipped power delivery without microcontroller dependency.

FAQ

What is the maximum output current per channel supported by the LTC3371EFE#TRPBF?

The LTC3371EFE#TRPBF supports up to 4A per channel by combining four of its eight internal 1A synchronous buck power stages. Configuration is set via C1–C3 pins, enabling eight distinct output topologies including 4×2A, 2×4A, and 3A+1A+2A+2A. The actual achievable current depends on thermal design and input voltage, with full 4A sustained operation validated at V_IN = 3.3V and T_A ≤ 85°C.

Does the LTC3371EFE#TRPBF require an external crystal or clock source?

No, the LTC3371EFE#TRPBF does not require an external crystal. It features an internal 2MHz oscillator as default, or supports frequency programming from 1MHz to 3MHz using a single RT-to-ground resistor. Alternatively, it accepts an external clock signal on the PLL/MODE pin for synchronization to system timing references - eliminating need for crystals or oscillators in most applications.

How is power sequencing controlled on the LTC3371EFE#TRPBF?

Power sequencing on the LTC3371EFE#TRPBF is controlled through precision enable thresholds: EN pins activate at 400–420mV (rising) when at least one regulator is enabled, and 730–1200mV (rising) when all are disabled. This hysteresis allows cascaded enable schemes using simple RC networks or dedicated sequencers. No external logic or firmware is required for deterministic, repeatable startup order across temperature and voltage.

Can the LTC3371EFE#TRPBF monitor die temperature, and how is this implemented?

Yes, the LTC3371EFE#TRPBF provides die temperature monitoring via the TEMP pin, which outputs a linear 7mV/°C voltage with 180–260mV offset at 25°C. This analog output can be read by an external ADC to implement thermal throttling or system-level alerts. Unlike digital sensors, it requires no communication protocol and delivers continuous real-time data without interrupt overhead - essential for safety-critical thermal management.

What package type and lead finish does the LTC3371EFE#TRPBF use?

The LTC3371EFE#TRPBF uses a 38-lead plastic TSSOP package with lead-free (RoHS-compliant) finish and tape-and-reel packaging (#TRPBF suffix). Its 5mm × 7mm footprint includes an exposed thermal pad (Pin 39) that must be soldered to PCB ground for optimal thermal performance (θ_JA = 25°C/W). This package is pin-compatible with the QFN variant (LTC3371EUHF#TRPBF) for dual-source flexibility.