Analog Devices Inc. LTC3370IUH#TRPBF

Overview

LTC3370IUH#TRPBF from Analog Devices (formerly Linear Technology) is a configurable 4-channel synchronous buck DC/DC power supply IC integrating eight 1A power stages. It supports input voltages from 2.25V to 5.5V per channel, delivers up to 4A per output via programmable stage combination, operates at 2MHz default switching frequency, and features precision enable thresholds for autonomous sequencing-used in automotive infotainment power rails and industrial FPGA core voltage domains.

For engineers reviewing the LTC3370IUH#TRPBF datasheet, LTC3370IUH#TRPBF pinout, LTC3370IUH#TRPBF application, or LTC3370IUH#TRPBF equivalent, key selection criteria include per-channel VIN independence, 8-stage configuration flexibility (1A–4A/channel), PGOODALL monitoring, temperature-sensing capability, and low-noise 90° phase-shifted switching for EMI-sensitive embedded systems.

Technical Context

The LTC3370IUH#TRPBF implements four independent buck regulators sharing eight identical 1A synchronous power stages, assigned via C1–C3 logic pins to yield 8 distinct output configurations (e.g., 1×4A, 2×2A, 4×1A). Each buck uses internal PMOS/NMOS switches with 300mΩ/240mΩ typical R_DS(ON), supporting forced continuous or Burst Mode® operation selected via PLL/MODE pin.

Switching frequency is set by RT resistor (1–3MHz), synchronized externally via PLL/MODE, or fixed at 2MHz; all channels are phased 90° apart to reduce input ripple. The TEMP pin provides a linear 7mV/°C analog temperature signal referenced to 220mV at 25°C, while PGOODALL asserts open-drain low when any enabled buck falls below 95–98% of its regulated output.

Key Specifications

Pinout & Package

The LTC3370IUH#TRPBF is housed in a 32-lead 5mm × 5mm QFN package with exposed thermal pad (Pin 33 = GND), optimized for high-power density and thermal performance (θ_JA = 34°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP24564GL-Z and TPS65218D0, the LTC3370IUH#TRPBF uniquely supports per-channel input voltage independence, 8-stage reconfiguration, and analog die temperature sensing-making it optimal for complex, thermally constrained, or mixed-input power architectures where flexibility and telemetry are critical.

Availability

LTC3370IUH#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, industrial PLC I/O modules, and FPGA-based test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC3370IUH#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 LTC3370IUH#TRPBF belongs to Linear's configurable multichannel buck regulator product line, designed specifically for space-constrained systems demanding flexible, thermally aware, and EMI-optimized power delivery across diverse input sources.

FAQ

What is the operating temperature range for the LTC3370IUH#TRPBF?

The LTC3370IUH#TRPBF is rated for –40°C to +125°C junction temperature and is qualified for industrial and automotive applications. Its thermal shutdown activates at 170°C with 10°C hysteresis, and the TEMP pin provides continuous die temperature telemetry across this full range. This makes the LTC3370IUH#TRPBF suitable for under-hood automotive modules and factory-floor PLCs where ambient temperatures exceed 85°C.

How does the C1–C3 configuration logic work on the LTC3370IUH#TRPBF?

The C1–C3 pins (Pins 11–13) form a 3-bit binary code that selects one of eight predefined power stage allocations-for example, C1C2C3 = 000 configures four 2A outputs, while 101 yields two 3A outputs and one 2A output. Each bit must be hard-wired to VCC or GND; floating is prohibited. The LTC3370IUH#TRPBF decodes these pins at power-up to configure internal switch routing before regulation begins.

Can the LTC3370IUH#TRPBF synchronize to an external clock, and how is it implemented?

Yes, the LTC3370IUH#TRPBF synchronizes to an external clock via the PLL/MODE pin (Pin 28). When driven with a clean square wave (1–3MHz, t_LOW/t_HIGH > 40ns), all eight power stages lock to the applied frequency and automatically adjust slope compensation. This eliminates beat frequencies in multi-IC systems and ensures deterministic EMI placement-critical for EMC-compliant designs using multiple LTC3370IUH#TRPBF devices.

What is the purpose of the PGOODALL pin on the LTC3370IUH#TRPBF?

The PGOODALL pin (Pin 14) is an open-drain output that goes low whenever *any* enabled buck regulator falls below its PGOOD threshold-98% of target for Buck 1, 95% for Bucks 2–4. It serves as a system-level "power-fail" indicator, enabling centralized monitoring without polling individual PGOOD signals. External pull-up is required, and the LTC3370IUH#TRPBF drives it low within 10µs of fault detection.

Does the LTC3370IUH#TRPBF support different operating modes for light-load efficiency?

Yes, the LTC3370IUH#TRPBF supports two light-load modes controlled by the PLL/MODE pin: pulling it low enables Burst Mode® operation (63µA quiescent current for one active channel), while tying it to VCC forces continuous conduction mode. Burst Mode® improves light-load efficiency but introduces low-frequency output ripple; forced continuous mode eliminates ripple at the cost of higher I_Q. Both modes are supported across the full –40°C to +125°C range.