Analog Devices Inc. LTC3371EUHF#PBF

Overview

LTC3371EUHF#PBF 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 integrated watchdog/power-on reset. It serves as a multichannel PMIC in automotive infotainment and industrial control systems requiring precise sequencing and fault reporting.

For engineers reviewing the LTC3371EUHF#PBF datasheet, LTC3371EUHF#PBF pinout, LTC3371EUHF#PBF application, or LTC3371EUHF#PBF equivalent, key selection criteria include per-stage VIN independence, C1–C3 programmable power-stage grouping, CT-pin-timed RST/WDI/WDO behavior, and thermal performance in the 38-lead 5mm × 7mm QFN package.

Technical Context

The LTC3371EUHF#PBF implements eight discrete 1A synchronous buck power stages that can be combined into 1–4 output channels via hardware-selectable C1–C3 pins, enabling flexible current allocation (e.g., 4A on one rail, or 2A+2A on two rails). Each configured buck uses independent VIN supplies and shares a common switching frequency set by RT resistor, internal 2MHz oscillator, or external PLL sync.

Its timing subsystem uses a single CT capacitor to scale four independent RST assertion delays, watchdog timeout intervals (tWDI = 1.62s typ), and WDO low-pulse width (tWDO = 202ms typ). Precision enable thresholds (VHI = 400–420mV when active) and phased 90° switching reduce input ripple and support autonomous power sequencing.

Key Specifications

Pinout & Package

The LTC3371EUHF#PBF is housed in a 38-lead, 5mm × 7mm plastic QFN package (UHF) with exposed thermal pad (Pin 39 = GND). Pin assignment is identical for QFN and TSSOP variants per datasheet Figure 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65218D0RSLR and MAX20029ATGB/V+T, the LTC3371EUHF#PBF uniquely offers hardware-configurable power-stage grouping, per-stage independent VIN, and single-capacitor CT timing for RST/watchdog - making it optimal for custom multirail systems requiring field-programmable current allocation and deterministic fault response.

Availability

LTC3371EUHF#PBF 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 operation (–40°C to 125°C), and long-term lifecycle support.

Supply support for LTC3371EUHF#PBF 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, formed through the acquisition of Linear Technology in 2017.

The LTC3371EUHF#PBF belongs to ADI's Power by Linear™ family of highly integrated DC/DC solutions, designed specifically for space-constrained, multirail applications demanding configurability, low quiescent current, and robust fault management in automotive, industrial, and medical systems.

FAQ

What input voltage ranges does the LTC3371EUHF#PBF support per buck stage?

The LTC3371EUHF#PBF supports an input voltage range of 2.25V to 5.5V independently on each of its eight power stages (VINA–VINH). This allows interfacing with diverse intermediate bus voltages - such as 3.3V, 5V, or partially regulated 12V-derived rails - without level-shifting or additional pre-regulation. The specification is guaranteed across the full –40°C to 125°C operating junction temperature range.

How does the C1–C3 pin configuration affect output current capability in the LTC3371EUHF#PBF?

The C1–C3 pins on the LTC3371EUHF#PBF select one of eight predefined groupings of its eight 1A power stages to form 1–4 output channels. For example, C1=C2=C3=0 configures four 2A outputs, while C1=C2=C3=1 configures one 8A output. Each configuration determines both channel count and per-channel current limit - no software or register writes are needed, enabling simple, repeatable hardware-based customization.

What is the function of the CT pin on the LTC3371EUHF#PBF, and what capacitor value is required?

The CT pin on the LTC3371EUHF#PBF sets the timing reference for the watchdog timeout (tWDI), WDO pulse width (tWDO), and RST assertion delay via an external capacitor to GND. A 10nF capacitor yields tWDI = 1.62s (max), tWDO = 202ms, and tRST = 202ms. Values other than 10nF linearly scale all three intervals - e.g., 20nF doubles each timing parameter - enabling system-level tuning without changing firmware or logic.

Does the LTC3371EUHF#PBF support forced continuous conduction mode (FCCM), and how is it enabled?

Yes, the LTC3371EUHF#PBF supports both Burst Mode® operation (for high light-load efficiency) and forced continuous conduction mode (FCCM) across all configured buck channels. FCCM is selected by driving the PLL/MODE pin to VCC (typically >VCC – 0.4V); pulling PLL/MODE low selects Burst Mode®. FCCM eliminates low-frequency switching artifacts and provides predictable EMI profiles, essential for noise-sensitive analog or RF circuits.

What thermal performance characteristics does the LTC3371EUHF#PBF offer in its QFN package?

The LTC3371EUHF#PBF in the 38-lead 5mm × 7mm QFN (UHF) package has a junction-to-ambient thermal resistance (θJA) of 34°C/W with proper PCB layout (including soldered exposed pad to thermal plane). It includes overtemperature protection triggering at 170°C with 10°C hysteresis, and operates reliably from –40°C to 125°C junction temperature. The TEMP pin provides a linear 7mV/°C analog output for die temperature monitoring.