Analog Devices Inc. LTC3374IUHF#TRPBF

Overview

LTC3374IUHF#TRPBF from Analog Devices (formerly Linear Technology) is an 8-channel, 1A per channel synchronous buck DC/DC regulator IC with independent input supplies (2.25V–5.5V), programmable 1MHz–3MHz switching frequency, and configurable parallel operation up to 4A per output using shared inductors. It integrates die temperature monitoring and precision enable thresholds for autonomous power-up sequencing in multirail systems.

For engineers reviewing the LTC3374IUHF#TRPBF datasheet, LTC3374IUHF#TRPBF pinout, LTC3374IUHF#TRPBF application, or LTC3374IUHF#TRPBF equivalent, key selection criteria include per-channel VIN independence, master-slave parallel configuration capability, thermal monitoring via TEMP pin, 0.8V–VIN output range, and QFN-38 (5mm × 7mm) thermally enhanced package with exposed GND pad.

Technical Context

The LTC3374IUHF#TRPBF implements eight fully independent synchronous buck regulators, each with dedicated VIN, SW, FB, and EN pins, enabling flexible rail assignment and isolation. Its internal oscillator supports resistor-programmed (RT pin), external synchronization (SYNC), or default 2MHz operation, with 90° phase interleaving across channels to reduce input ripple.

Operating mode (Burst Mode® vs forced continuous) is globally controlled by the MODE pin, while PGOOD_ALL provides consolidated power-good status across all enabled regulators. The TEMP pin delivers a calibrated 150mV ±10mV at 25°C with 6.75mV/°C slope for real-time junction temperature monitoring and overtemperature protection at 165°C.

Key Specifications

Pinout & Package

Package: 38-lead plastic QFN (5mm × 7mm), thermally enhanced with exposed GND pad (Pin 39) requiring PCB soldering for electrical and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8645PGU-AEC1-Z and TPS65270PWPR, the LTC3374IUHF#TRPBF uniquely delivers 8 independent 1A rails with per-VIN sourcing, programmable frequency, phase interleaving, and calibrated die temperature monitoring - making it optimal for complex, thermally sensitive, multirail embedded systems requiring design flexibility and observability.

Availability

LTC3374IUHF#TRPBF is available at Aetrix Electronics and suitable for industrial automation, automotive ADAS, and communications infrastructure applications requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term production continuity.

Supply support for LTC3374IUHF#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 analog and power management portfolio with rigorous qualification and long-term support.

The LTC3374IUHF#TRPBF belongs to Linear's high-density multichannel power regulator family, designed specifically for space-constrained, thermally demanding systems requiring autonomous sequencing, rail independence, and real-time thermal telemetry without external components.

FAQ

What is the maximum output current achievable per channel on the LTC3374IUHF#TRPBF?

The LTC3374IUHF#TRPBF supports up to 4A per output by paralleling up to four of its eight 1A buck regulators (e.g., BUCK1–BUCK4) using shared inductors and synchronized switching. This configuration requires connecting corresponding FBx pins to VINx and ensuring matched layout and component selection to balance current sharing within ±10%.

Does the LTC3374IUHF#TRPBF support independent input supplies for each channel?

Yes, the LTC3374IUHF#TRPBF features eight dedicated VIN pins (VIN1–VIN8), each rated for 2.25V to 5.5V. This allows true input independence - for example, powering noise-sensitive analog rails from a clean LDO while supplying digital rails from a higher-efficiency DC/DC - eliminating cross-coupling and simplifying system-level power architecture.

How does the TEMP pin on the LTC3374IUHF#TRPBF provide thermal monitoring?

The TEMP pin on the LTC3374IUHF#TRPBF outputs a calibrated analog voltage: 150mV at 25°C with a slope of 6.75mV/°C. By measuring this voltage with a host ADC, designers can compute real-time die temperature as T_J = (V_TEMP – 150mV) / 6.75mV/°C + 25°C, enabling proactive thermal throttling or alarm generation before reaching the 165°C overtemperature shutdown threshold.

Can the LTC3374IUHF#TRPBF be synchronized to an external clock?

Yes, the LTC3374IUHF#TRPBF supports external synchronization via the SYNC pin, accepting 1MHz to 3MHz square-wave clocks. When driven, the internal oscillator locks to the external signal and automatically adapts slope compensation to maintain stable current-mode control - essential for reducing EMI in noise-sensitive systems or aligning switching with system timing domains.

What is the purpose of the PGOOD_ALL pin on the LTC3374IUHF#TRPBF?

The PGOOD_ALL pin on the LTC3374IUHF#TRPBF is an open-drain output that goes low whenever the regulated output voltage of any enabled buck regulator falls more than 7.5% below its programmed value. It serves as a consolidated power-good indicator for system-level monitoring, enabling simple OR-ing with other power supplies and direct connection to FPGA/ASIC reset controllers without additional logic.