Analog Devices Inc. LTC3311HV#TRMPBF

Overview

LTC3311HV#TRMPBF from Analog Devices is a monolithic, Silent Switcher® step-down DC/DC converter delivering up to 12.5A output current from a 2.25V–5.5V input, featuring 500mV feedback reference, 35ns minimum on-time, and ±1% V_OUT accuracy with remote sense. It operates in forced continuous or pulse-skipping mode and supports multi-phase paralleling for higher power systems-ideal for FPGA, ASIC, and µP core supplies.

For engineers reviewing the LTC3311HV#TRMPBF datasheet, LTC3311HV#TRMPBF pinout, LTC3311HV#TRMPBF application, or LTC3311HV#TRMPBF equivalent, key selection criteria include its AEC-Q100-qualified 3mm × 3mm LQFN package, 4.5mΩ NMOS / 16mΩ PMOS R_DS(ON), programmable 0.5–5MHz switching frequency, thermal shutdown with die temperature monitor, and compatibility with LTC3310/LTC3310S/LTC3311S.

Technical Context

The LTC3311HV#TRMPBF employs constant-frequency peak current mode control with internal 500mV reference and error amplifier transconductance of 1mS. Its Silent Switcher 1 architecture integrates split power planes and differential SW routing to suppress common-mode EMI, enabling CISPR Class 5-compliant radiated emissions without external filters.

It supports dual-mode operation via MODE/SYNC pin: synchronization to external clock (0.5–2.25MHz) or internal PLL-based frequency setting (0.5–5MHz via RT resistor). The device implements active voltage positioning (AVP) only in LTC3311-X variants-not applicable to LTC3311HV#TRMPBF-and uses AGND for Kelvin remote sensing to maintain ±1% regulation under ±100mV ground offset.

Key Specifications

Pinout & Package

Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), θ_JA = 42°C/W, θ_JCbottom = 9°C/W. Exposed pad must be soldered to PCB ground plane with ≥6 thermal vias.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current synchronous buck converter applications.

Compared with LTC3311JV#TRMPBF, the LTC3311HV#TRMPBF offers identical performance with automotive-grade reliability assurance; compared with LTC3311S-1#TRMPBF, it provides full output adjustability at the cost of two external resistors-critical for adaptive core voltage schemes.

Availability

LTC3311HV#TRMPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS processors, and industrial PLC CPU modules requiring stable component supply, AEC-Q100 qualification, and high-current density in compact 3mm × 3mm packaging.

Supply support for LTC3311HV#TRMPBF 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC3311HV#TRMPBF belongs to the Silent Switcher® power management product line, designed specifically for noise-sensitive, high-current POL applications demanding ultra-low EMI, high efficiency, and robust thermal performance in space-constrained environments.

FAQ

What is the maximum output current capability of the LTC3311HV#TRMPBF?

The LTC3311HV#TRMPBF delivers up to 12.5A continuous output current when properly thermally managed on a 4-layer PCB with ≥6 thermal vias to a solid ground plane. Its 4.5mΩ NMOS and 16mΩ PMOS R_DS(ON) values, combined with θ_JA = 42°C/W, enable this rating at T_J ≤ 150°C under typical 3.3V→1.2V conditions. Derating is required above 85°C ambient.

Does the LTC3311HV#TRMPBF support remote voltage sensing?

Yes, the LTC3311HV#TRMPBF supports true Kelvin remote sensing via the AGND pin, which serves as the reference for the FB divider's low-side node. This configuration rejects up to ±100mV of ground potential difference between the IC and load, ensuring ±1% V_OUT accuracy even with significant PCB IR drop-critical for high-current FPGA and ASIC core supplies.

How does the MODE/SYNC pin function on the LTC3311HV#TRMPBF?

The MODE/SYNC pin on the LTC3311HV#TRMPBF serves three roles: (1) selects pulse-skipping or forced continuous mode, (2) accepts an external clock (0.5–2.25MHz) for synchronization, or (3) outputs a clock signal when configured for multi-phase operation. Internal PLL ensures seamless transition between free-running and synchronized modes with <20μs detection of clock loss.

What thermal protection features does the LTC3311HV#TRMPBF include?

The LTC3311HV#TRMPBF incorporates dual thermal safeguards: (1) thermal shutdown triggers at ~160°C junction temperature to prevent damage, and (2) real-time die temperature monitoring via the SSTT pin, which outputs ~4mV/°C for system-level thermal management. Both functions operate across the full –40°C to +150°C junction range specified for the HV grade.

Can the LTC3311HV#TRMPBF be paralleled with other units for higher current?

Yes, the LTC3311HV#TRMPBF supports multi-phase paralleling via the MODE/SYNC pin to distribute current among multiple converters. Phase offsets are set using RT resistors, and PGOOD pins can be wire-OR'd for unified power-good signaling. This configuration scales output current beyond 12.5A while maintaining low EMI and balanced thermal loading across all phases.