Analog Devices Inc. LTC3372IUK#TRPBF

Overview

LTC3372IUK#TRPBF from Analog Devices is a highly flexible multioutput power supply IC integrating a 4.5V–60V high-voltage synchronous buck controller and four configurable low-voltage synchronous buck regulators with eight 1A integrated power stages. It supports up to 4A per channel across eight output configurations, delivers precision enable thresholds for reliable sequencing, and operates with ultra-low quiescent current (15µA HV-only at 5V_OUT). It is used in automotive always-on systems requiring robust multi-rail power management.

For engineers reviewing the LTC3372IUK#TRPBF datasheet, LTC3372IUK#TRPBF pinout, LTC3372IUK#TRPBF application, or LTC3372IUK#TRPBF equivalent, key selection considerations include its 48-pin 7mm × 7mm QFN package, programmable LV regulator configuration via C1–C3 pins, CT-pin-programmable watchdog and Power-On Reset timing, die temperature monitoring, and support for 1MHz–3MHz switching (HV runs at 1/6 frequency).

Technical Context

The LTC3372IUK#TRPBF implements a dual-domain architecture: a high-voltage controller drives external N-channel FETs using TG/BG gate drivers with 2.3Ω top-gate pull-up and 2.4Ω bottom-gate pull-up on-resistance, while four low-voltage regulators integrate PMOS/NMOS power stages (290mΩ/180mΩ typical R_DS(ON)) and share eight 1A stages via C1–C3 logic. The HV controller supports forced continuous, pulse-skipping, and Burst Mode operation with 15–46µA no-load IQ depending on V_OUT and enabled LV channels.

Its timing subsystem uses an RT resistor to set LV switching frequency (1–3MHz), with HV operating at 1/6× that rate; the CT pin programs both watchdog timeout (e.g., 12.9s typical with 10nF) and RST assertion delay (202ms typical). Precision feedback references (800mV ±1%) and ±7mV/°C temperature monitor output (220mV at 25°C) enable accurate rail regulation and thermal supervision in harsh environments.

Key Specifications

Pinout & Package

The LTC3372IUK#TRPBF is housed in a thermally enhanced 48-pin 7mm × 7mm plastic QFN package (UK grade) with exposed pad (Pin 49) soldered to PCB ground for optimal thermal performance. Pin numbering follows standard top-view layout with GND on Pin 49 and functional grouping across four sides.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4470-AEC1 and TPS6521905RHBR, the LTC3372IUK#TRPBF uniquely combines a 60V HV controller with software-configurable multi-amp LV outputs in one package, enabling fewer components, smaller footprint, and design reuse across platforms with varying rail requirements.

Availability

LTC3372IUK#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, industrial PLC I/O modules, medical patient monitors, and telecom remote radio units requiring stable component supply, extended temperature operation, and long-term lifecycle support.

Supply support for LTC3372IUK#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and interface solutions.

The LTC3372IUK#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency, high-reliability power management ICs designed specifically for demanding automotive and industrial applications requiring wide input ranges, low quiescent current, and robust thermal performance.

FAQ

What is the maximum input voltage supported by the LTC3372IUK#TRPBF high-voltage controller?

The LTC3372IUK#TRPBF high-voltage controller supports an absolute maximum VIN of 65V, with recommended operating range from 4.5V to 60V. This allows direct connection to 12V, 24V, and 48V battery or industrial bus systems. Operation above 60V risks exceeding safe operating area limits and is not guaranteed across temperature.

How does the C1–C3 pin configuration affect the LTC3372IUK#TRPBF's low-voltage regulator outputs?

The C1–C3 pins on the LTC3372IUK#TRPBF determine how its eight integrated 1A power stages are allocated across up to four output channels. For example, C1=C2=C3=0 configures four 2A outputs, while C1=1,C2=1,C3=1 configures one 4A output. Each combination defines specific current ratings per VOUT1–4, and the configuration is latched at power-up.

Can the LTC3372IUK#TRPBF operate with different input sources for its high-voltage and low-voltage sections?

Yes - the LTC3372IUK#TRPBF supports independent sourcing: the HV controller takes VIN (4.5–60V), while each LV regulator's VINA–H pins accept separate 2.25–5.5V supplies. These may be derived from the HV output, auxiliary rails, or local LDOs, enabling flexible power architecture partitioning and fault isolation between domains.

What is the purpose of the CT pin on the LTC3372IUK#TRPBF, and how is it used?

The CT pin on the LTC3372IUK#TRPBF sets timing for both the watchdog timer and Power-On Reset (RST) function via an external capacitor. A 10nF capacitor yields ~202ms RST assertion delay and ~12.9s watchdog timeout. Floating CT disables both features. This single-pin programming simplifies design versus discrete RC networks or digital configuration.

Does the LTC3372IUK#TRPBF provide any built-in thermal monitoring capability?

Yes - the LTC3372IUK#TRPBF includes a dedicated TEMP pin that outputs an analog voltage proportional to die temperature (220mV at 25°C, +7mV/°C). This enables real-time thermal telemetry for system-level thermal management. Additionally, it features hardware overtemperature shutdown at 170°C with 10°C hysteresis for fail-safe protection.