Analog Devices Inc. LTC3311JV-1#TRMPBF

Overview

LTC3311JV-1#TRMPBF from Analog Devices is a monolithic, Silent Switcher® step-down DC/DC converter delivering up to 12.5A output current from 2.25V–5.5V input, with fixed 1.0V output, ±1% VOUT accuracy (with remote sense), 35ns minimum on-time, and operation up to 5MHz switching frequency. It serves as a high-efficiency core supply for FPGA, ASIC, and µP power rails in space-constrained automotive and industrial systems.

For engineers reviewing the LTC3311JV-1#TRMPBF datasheet, LTC3311JV-1#TRMPBF pinout, LTC3311JV-1#TRMPBF application, or LTC3311JV-1#TRMPBF equivalent, key selection criteria include its AEC-Q100 qualification, 18-lead 3mm × 3mm LQFN thermal performance (θJCbottom = 9°C/W), integrated active voltage positioning (2.0 mV/A), and support for multi-phase paralleling in forced continuous mode.

Technical Context

The LTC3311JV-1#TRMPBF employs constant-frequency peak current mode control with a 500mV internal reference and precision error amplifier (1 mS transconductance) to achieve fast transient response. Its Silent Switcher 1 architecture uses dual, matched switch node routing and integrated bypass capacitors to suppress common-mode EMI without external filters.

It integrates complementary NMOS (4.5 mΩ) and PMOS (16 mΩ) power switches, supports programmable frequency via RT pin (0.5–5 MHz), and features configurable MODE/SYNC for synchronization, multiphase operation, or pulse-skipping/forced continuous mode selection - all while maintaining 100% duty cycle capability for low-dropout operation.

Key Specifications

Pinout & Package

Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), θJCbottom = 9°C/W, requiring soldered thermal connection to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with LTC3311JV-1#TRMPBF, the TRPBF variant offers identical performance with optimized logistics for volume manufacturing, while the LTC3311SJV-1#TRMPBF delivers measurable EMI and efficiency improvements - making it preferable for next-gen RF-sensitive or thermally constrained designs.

Availability

LTC3311JV-1#TRMPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS processor rails, and industrial PLC I/O modules requiring stable component supply, AEC-Q100 qualification, and compact 3mm × 3mm thermal packaging.

Supply support for LTC3311JV-1#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 LTC3311 family is designed as ultra-small, low-EMI monolithic buck converters targeting high-current, space-constrained point-of-load applications in automotive, computing, and telecom infrastructure - emphasizing thermal robustness, EMI compliance, and design simplicity.

FAQ

What is the output voltage tolerance of the LTC3311JV-1#TRMPBF over temperature and load?

The LTC3311JV-1#TRMPBF guarantees ±1% output voltage accuracy over the full –40°C to +150°C junction temperature range and across 0A to 12.5A load, measured with remote sense (AGND connection). At 12.5A, typical VOUT is 991–1000.9mV; at 0A, it is 1005.8–1026.2mV, reflecting its active voltage positioning behavior. This specification is confirmed in the Electrical Characteristics table (Rev. B datasheet, page 3).

Does the LTC3311JV-1#TRMPBF require external feedback resistors?

No. The LTC3311JV-1#TRMPBF is the fixed 1.0V variant of the LTC3311 family; its output voltage is set by internal factory-trimmed resistors. Pin 18 is labeled VOUT (not FB), and no external divider is needed - unlike the adjustable LTC3311. This eliminates resistor tolerance errors and saves board space, directly contributing to its ±1% accuracy claim.

How does the LTC3311JV-1#TRMPBF achieve CISPR 25 Class 5 EMI compliance?

The LTC3311JV-1#TRMPBF achieves CISPR 25 Class 5 compliance through its Silent Switcher 1 architecture: symmetrical, tightly coupled switch node copper pours minimize magnetic field loop area; integrated input bypass capacitors reduce high-frequency current loops; and the 3mm × 3mm LQFN package's low-inductance pinout suppresses common-mode noise. Test data (Figure G29–G31, Rev. B) confirms compliance at 10A/1.2V with only a minimal external EMI filter.

Can the LTC3311JV-1#TRMPBF be used in multi-phase configurations?

Yes. The LTC3311JV-1#TRMPBF supports multi-phase paralleling via its MODE/SYNC pin (Pin 13), which can accept an external clock or output a synchronized clock for phase interleaving. Its matched internal power switches, tight current limit matching (±15%), and shared PGOOD signaling enable robust current sharing. The datasheet explicitly states "multi-phasing parallel converters is readily implemented" and provides phasing guidance in the Applications Information section.

What thermal derating applies to the LTC3311JV-1#TRMPBF at 12.5A output?

At 12.5A continuous output, the LTC3311JV-1#TRMPBF requires adequate PCB thermal design: the exposed PGND pad (Pin 19) must be soldered to a ≥4-layer board with ≥6 thermal vias to an internal ground plane. With θJCbottom = 9°C/W and typical 2.0W power dissipation (at VIN=3.3V, VOUT=1.0V), junction rise above board temperature is ~18°C. Full 12.5A operation is rated up to +125°C ambient when PCB thermal resistance (θJA) is ≤42°C/W - verified in the Absolute Maximum Ratings table (page 2).