Analog Devices Inc. LTC3310SIV-1#WTRMPBF

Overview

LTC3310SIV-1#WTRMPBF from Analog Devices is a monolithic, Silent Switcher 2 synchronous step-down DC/DC converter delivering up to 10A output current from 2.25V–5.5V input, with fixed 1.0V output, ±1% accuracy (with remote sense), and 35ns minimum on-time. It operates in pulse-skip or forced continuous mode and targets FPGA, ASIC, and µP core supplies requiring low EMI and high efficiency at up to 5MHz switching frequency.

For engineers reviewing the LTC3310SIV-1#WTRMPBF datasheet, LTC3310SIV-1#WTRMPBF pinout, LTC3310SIV-1#WTRMPBF application, or LTC3310SIV-1#WTRMPBF equivalent, key selection criteria include its AEC-Q100 qualification, 18-pin 3mm × 3mm LQFN package, 1µA shutdown current, precision 400mV enable threshold, and integrated hot-loop bypass capacitors enabling ultralow radiated EMI per CISPR25 Class 5.

Technical Context

The LTC3310SIV-1#WTRMPBF employs constant-frequency peak current mode control with internal 500mV reference and error amplifier transconductance of 800µS (optimized for fixed 1V output). Its Silent Switcher 2 architecture integrates VIN-to-PGND and VIN-to-AGND bypass capacitors, eliminating external high-frequency ceramic caps required by first-gen Silent Switcher parts.

It supports multiphase paralleling via MODE/SYNC pin, offers programmable switching frequency (0.5–5MHz) using RT resistor, and implements active voltage positioning (AVP) with 1.7–3.1mV/A load-line slope-enabling improved transient response and reduced output capacitance in µP/FPGA core rails.

Key Specifications

Pinout & Package

Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), θ_JA = 42°C/W, thermally enhanced for high-current operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC3310SEV-1#TRPBF, the LTC3310SIV-1#WTRMPBF adds AEC-Q100 qualification and automotive process controls; versus TPS546D24RVFT, it delivers superior EMI immunity and analog-optimized transient response without PMBus overhead.

Availability

LTC3310SIV-1#WTRMPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC CPU rails, and 5G baseband radio supplies requiring stable component supply, AEC-Q100 compliance, and ultralow EMI performance.

Supply support for LTC3310SIV-1#WTRMPBF 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 LTC3310S family is designed for high-density, low-EMI point-of-load regulation in demanding applications including automotive ADAS, server VRMs, and FPGA/ASIC core supplies-emphasizing Silent Switcher 2 integration and AEC-Q100 readiness.

FAQ

What is the output voltage tolerance of the LTC3310SIV-1#WTRMPBF under load and temperature variation?

The LTC3310SIV-1#WTRMPBF guarantees ±1% output voltage accuracy over load (0–10A), line (2.25V–5.5V), and temperature (–40°C to +125°C) when using remote sensing (AGND connection to load ground). This includes effects of active voltage positioning, which intentionally shifts V_OUT by up to ±3.1mV/A to optimize transient response-still maintaining regulation within the ±1% band at nominal load.

Does the LTC3310SIV-1#WTRMPBF require external feedback resistors to set its output voltage?

No. The LTC3310SIV-1#WTRMPBF has an internally trimmed 1.000V reference and fixed feedback network; Pin 18 (FB/VOUT) connects directly to the output. Unlike the adjustable LTC3310S, no external RA/RB divider is needed-reducing BOM count and layout sensitivity while ensuring consistent 1V regulation across units.

How does the Silent Switcher 2 architecture in the LTC3310SIV-1#WTRMPBF reduce EMI compared to standard buck converters?

The LTC3310SIV-1#WTRMPBF integrates symmetric, matched VIN-to-PGND and VIN-to-AGND bypass capacitors inside the 3mm × 3mm LQFN package. This minimizes high-di/dt loop area and eliminates layout-dependent parasitic inductance, achieving >20dB lower radiated emissions than first-gen Silent Switcher parts and passing CISPR25 Class 5 without external EMI filters-verified on the DC2629A demo board.

Can the LTC3310SIV-1#WTRMPBF be synchronized to an external clock, and what is the supported frequency range?

Yes. The MODE/SYNC pin on the LTC3310SIV-1#WTRMPBF accepts an external square wave clock for synchronization. The supported input frequency range is 0.5MHz to 2.25MHz. During sync, the internal PLL locks to the external edge, automatically adapts slope compensation, and maintains pulse-skip operation-enabling deterministic EMI placement in noise-sensitive systems like 5G radios.

What thermal management provisions are built into the LTC3310SIV-1#WTRMPBF for 10A operation?

The LTC3310SIV-1#WTRMPBF uses a thermally enhanced 3mm × 3mm LQFN with an exposed PGND pad (Pin 19) that serves as the primary heat path. With θ_JA = 42°C/W and θ_JCbottom = 9°C/W, it requires soldering the pad to a ≥4cm² PCB ground plane with ≥6 thermal vias. Internal overtemperature protection triggers above 150°C junction, but continuous 10A operation at 85°C ambient is achievable with proper layout-validated per AEC-Q100 thermal cycling.