LINEAR LT3505IDD

Mfr. Part

LT3505IDD

Manufacturer

Linear Technology / Analog Devices

Y-IC is a quality distributor of Analog Devices (formerly Linear Technology). We supply genuine parts and deliver the best products and services, backed by fast support and reliable logistics.

Detailed Description

LT3505IDD is a monolithic, high-efficiency step-down (buck) switching regulator IC. It integrates the power switch and control circuitry to convert a higher input voltage down to a stable, adjustable lower output voltage. The IDD suffix indicates the industrial temperature grade in a compact DFN package. It runs at a high switching frequency (around 1 MHz), enabling small inductors and capacitors, low solution size, and quick transient response. Typical functions include soft-start, current limit, thermal shutdown, and low quiescent current operation to improve light-load efficiency. Suitable for 12 V and 24 V systems and other wide input sources found in industrial and automotive environments.

Main Category: Integrated Circuits (ICs)

Small Classification: Specialized ICs

Key Features

Monolithic step-down DC/DC regulator with integrated power switch

High switching frequency (approximately 1.1 MHz) for compact power stages

Wide input voltage capability for industrial and automotive rails

Adjustable output voltage to meet a broad range of loads

Soft-start and enable/run control for safe, controlled startup

Built-in current limiting and thermal shutdown for robust protection

Low quiescent current for strong light-load efficiency

Stable operation with small ceramic output capacitors

Compact DFN package option with exposed thermal pad

Key Advantages

Small solution footprint thanks to high switching frequency and DFN package

High efficiency across a wide load range reduces heat and power loss

Fast transient response keeps output stable when loads change quickly

Strong protection features minimize risk during faults and startup

Simple, flexible design that is easy to implement on standard PCBs

Reliable operation over industrial temperature ranges

Packaging

Type: DFN (DD package style), compact surface-mount

Material: Molded plastic body, matte-tin plated leads, RoHS compliant, lead-free

Size: Approx. 3 mm x 3 mm body footprint, low-profile height

Pin configuration: 10-lead DFN format (typical pins include VIN, SW, BST, FB, RUN/SS, GND, and related control pins; see datasheet for exact pinout)

Thermal characteristics: Exposed bottom thermal pad for heat spreading to PCB; use solid ground plane and thermal vias for best performance; device includes on-chip thermal shutdown

Electrical properties (overview): Integrated switch capable of supporting around 2+ A load currents; high-frequency operation (~1.1 MHz); wide input range typical of 12 V/24 V systems; adjustable output voltage; soft-start and current limit

Package / Case code: 831 (as provided)

Date code: 1836 (2018, week 36)

Inventory on hand: 1464 units currently available from Y-IC

Lifecycle

Status: Active and widely used in production designs

Not nearing discontinuation based on current market information. For latest lifecycle confirmation, contact Y-IC.

Equivalent or alternative models (selection depends on exact input range, output voltage/current, efficiency, and features required):

- LT3505A series variants (same family, differing limits/features)

- LT3693 family (higher current, high-frequency buck regulators)

- LT8610/LT8611 family (modern synchronous buck regulators, various current ratings)

- LT8609 family (compact synchronous buck, ~2 A class)

- LTC3639/LTC3621 families (robust high-voltage buck options; currents vary)

For a precise, drop-in or near-drop-in recommendation, share your target input/output specs and constraints. If an exact equivalent is not confirmed, please contact our sales team via the Y-IC website for detailed cross references and availability.

Key Application Areas

Industrial 12 V and 24 V rails

Automotive modules and infotainment power stages (with appropriate qualification)

Telecom and networking equipment point-of-load regulation

FPGA/ASIC core and I/O power supplies

Distributed power systems and POL converters

Battery-powered instruments and portable industrial tools

General-purpose step-down conversion in compact embedded systems

Datasheet

Y-IC hosts the most authoritative datasheet for LT3505IDD on our product page. Download it now to get exact electrical limits, pinouts, layout guidance, and application examples. For design validation, always use the datasheet from our site.

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