Analog Devices Inc. LTC3372HUK#PBF

Overview

LTC3372HUK#PBF from Analog Devices is a highly flexible multioutput power management IC integrating a 4.5V–60V high-voltage synchronous buck controller and four configurable low-voltage synchronous buck regulators with eight integrated 1A power stages. It supports up to 4A per channel, delivers precision enable thresholds (±50mV), achieves ≤15µA no-load IQ in HV-only mode (5V output), and operates across –40°C to +150°C for automotive always-on systems.

For engineers reviewing the LTC3372HUK#PBF datasheet, LTC3372HUK#PBF pinout, LTC3372HUK#PBF application, or LTC3372HUK#PBF equivalent, key selection considerations include its 48-pin 7mm × 7mm QFN package, programmable LV output configurations via C1–C3 pins, dual-mode operation (Burst/Forced Continuous), integrated die temperature monitoring, and precise Power-On Reset timing controlled by the CT pin.

Technical Context

The LTC3372HUK#PBF implements a two-tier architecture: a high-performance HV controller with all-N-channel gate drivers (TG/BG), adjustable switching frequency (1/6 × LV f_SW), and ±1% V_OUT regulation (4.875V/3.217V); plus four LV regulators sharing eight 1A integrated power stages, each with independent input supplies (2.25V–5.5V) and programmable output current allocation (1A–4A per channel).

Its control logic includes a precision error amplifier (2mS transconductance), programmable watchdog timer and RST delay via CT pin (10nF sets t_RST = 160–280ms), thermal shutdown at 170°C with 10°C hysteresis, and soft-start charge current of 7–14μA - all coordinated through dedicated pins (TRACK/SS, TEMP, WDI/WDO, RSTB) without external compensation.

Key Specifications

Pinout & Package

The LTC3372HUK#PBF is housed in a thermally enhanced 48-pin 7mm × 7mm plastic QFN package (UK) with exposed pad (Pin 49) soldered to PCB ground for optimal thermal performance. Pin functions are defined per Analog Devices' Rev. A datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-output power management applications.

Compared with LTC3372HUK#PBF, LTC3375HUK#PBF removes HV control to maximize LV configurability, while MAX20406ATGB/VY+ trades automotive temperature grade and on-die thermal sensing for broader channel count and lower input voltage range - making LTC3372HUK#PBF optimal for integrated HV+LV systems demanding AEC-Q100-equivalent ruggedness.

Availability

LTC3372HUK#PBF is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial PLCs, medical monitors, and EV battery management units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC3372HUK#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.

The LTC3372HUK#PBF belongs to Analog Devices' Power by Linear™ family, designed specifically for space-constrained, thermally demanding applications requiring integrated high- and low-voltage power conversion with automotive-grade reliability.

FAQ

What is the maximum junction temperature specification for the LTC3372HUK#PBF?

The LTC3372HUK#PBF is guaranteed over an operating junction temperature range of –40°C to +150°C, with overtemperature shutdown activating at 170°C and 10°C hysteresis. This H-grade qualification makes it suitable for under-hood automotive applications and high-ambient industrial environments where thermal headroom is critical. The exposed-pad QFN package enables efficient heat dissipation to the PCB.

How does the C1–C3 pin configuration affect output current distribution in the LTC3372HUK#PBF?

The C1–C3 pins on the LTC3372HUK#PBF determine how the eight integrated 1A power stages are allocated across the four LV buck outputs. For example, C1=C2=C3=0 configures all four channels for 2A each, while C1=1,C2=1,C3=1 allocates 4A to VOUT4 only. Each combination defines fixed per-channel current limits - no dynamic reconfiguration is supported after power-up.

Can the LTC3372HUK#PBF operate without the high-voltage controller enabled?

Yes - the LTC3372HUK#PBF supports standalone LV regulator operation. By holding RUN = GND and enabling EN1–EN4, the HV controller is disabled while the four LV bucks remain fully functional, drawing power from their respective VINA–H inputs (2.25V–5.5V). This mode achieves ultra-low IQ (9µA per active channel) and is ideal for battery-backed auxiliary rails.

What is the purpose of the CT pin on the LTC3372HUK#PBF, and how is it used?

The CT pin on the LTC3372HUK#PBF sets timing for both the Power-On Reset (RST) assertion delay and the watchdog timer window. Connecting a 10nF capacitor yields RST delay of 160–280ms and watchdog timeout of 9.7–16.1s. This single-pin programmability simplifies design versus discrete RC networks and ensures synchronized startup and fault monitoring across all regulated outputs.

Does the LTC3372HUK#PBF provide feedback voltage accuracy across temperature and load?

Yes - the LTC3372HUK#PBF guarantees feedback voltage accuracy of ±1% over temperature and line/load conditions. VFB1 is trimmed to 800mV ±8mV (±1%), and VFB2–VFB4 to 800mV ±20mV (±2.5%). This precision enables stable regulation of sensitive loads like ADC references and RF synthesizers without external trimming components.