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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear + Switching

Analog Devices Inc. LT3500EDD#PBF

Name: LT3500EDD#PBF
Brand: Analog Devices Inc.
SKU: LT3500EDD#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LT3500EDD#PBF

Manufacturer:: Analog Devices Inc.

Category:: Voltage Regulators - Linear + Switching

Package:: 12-WFDFN Exposed Pad

Datasheet:: LT3500EDD#PBF.pdf

Description:: IC REG DL BUCK/LINEAR 12DFN

Quantity:: RFQ Add To RFQ list

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Inventory:767

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Product details

Overview

LT3500EDD#PBF from Analog Devices is a monolithic 2A step-down DC-DC regulator with an additional adjustable linear regulator or linear regulator controller. The device is designed for wide-input power systems that need a robust buck converter plus a secondary low-noise or post-regulated rail in a compact surface-mount package.

As part of the Analog Devices LT3500 family, LT3500EDD#PBF combines a current-mode PWM buck regulator with an internal 2.3A switch, 3V to 36V operating input range, adjustable 250kHz to 2.2MHz switching frequency, soft-start/tracking, power-good comparator outputs, and a 13mA linear regulator/driver. For engineers reviewing the LT3500EDD#PBF datasheet, LT3500EDD#PBF pinout, LT3500EDD#PBF application, or LT3500EDD#PBF equivalent, this device is widely used in automotive battery regulation, industrial control, wall transformer regulation, distributed power regulation, and compact dual-rail embedded systems.

Technical Context

In automotive and industrial power systems, LT3500EDD#PBF operates as a current-mode PWM buck regulator that steps down high or variable input supplies into a regulated output adjustable down to 0.8V. Its 3V to 36V operating range and 40V maximum rating make it suitable for battery, adapter, and 24V industrial rails.

The programmable 250kHz to 2.2MHz oscillator allows designers to trade off efficiency, inductor size, thermal behavior, and EMI placement. The device can also synchronize to an external clock, which helps when multiple switching regulators must avoid beat frequencies or sensitive system bands.

LT3500EDD#PBF is commonly used in automotive battery regulation, industrial controllers, wall-adapter equipment, distributed point-of-load supplies, and embedded products that need a 2A buck rail plus a linear post-regulator or auxiliary regulator controller.

Key Specifications

Parameter	Value and Actual Design Meaning
Device Type	Monolithic 2A step-down regulator plus adjustable linear regulator/controller.
Input Voltage Range	3V to 36V operating input range with 40V maximum rating.
Buck Switch	Internal 2.3A power switch supports up to 2A output current capability.
Output Voltage	Buck output adjustable down to 0.8V for low-voltage logic and processor rails.
Switching Frequency	Adjustable and synchronizable fixed-frequency operation from 250kHz to 2.2MHz.
Linear Regulator / Driver	Adjustable linear regulator or controller with 13mA output capability.
Protection	Cycle-by-cycle current limit, frequency foldback, thermal shutdown, short-circuit protection, and soft-start/tracking.
Package	EDD suffix indicates thermally enhanced 3mm x 3mm DFN package.

Pinout & Package

The LT3500EDD#PBF pinout includes the high-voltage buck input, switching node, boost drive, feedback and compensation pins, soft-start/tracking control, synchronization/frequency setting, power-good comparator outputs, and linear regulator/controller connections.

For PCB design, the input capacitor, catch diode or switch current path, inductor, and output capacitor should be kept close to the IC. The feedback divider should connect to a quiet output sense point, and the DFN exposed pad should be tied to ground copper for thermal performance.

Pin / Function	PCB Design and Circuit Role
VIN	Input supply for the buck regulator; supports wide automotive and industrial input rails.
SW	Switching node connected to the inductor and power path; keep routing short and controlled.
BOOST	Bootstrap supply node used to drive the internal power switch.
FB	Buck feedback input used to set output voltage down to 0.8V.
VC / Compensation	Control-loop compensation node for regulator stability and transient response.
RT / SYNC	Programs switching frequency or accepts an external synchronization clock.
SS / TRACK	Controls soft-start ramp or output tracking during startup.
PG Outputs	Power-good comparator outputs for rail status and system supervision.
Linear Regulator Pins	Connections for the adjustable linear regulator or external pass-device controller.
GND / Exposed Pad	Ground and thermal return path requiring solid copper connection.

Key Features

Wide 3V to 36V input range supports automotive, industrial, and adapter supplies.
2A buck output with internal 2.3A switch reduces external power-stage complexity.
Adjustable 250kHz to 2.2MHz frequency supports efficiency and size optimization.
Linear regulator/controller adds a secondary rail or post-regulated output.
Soft-start and tracking reduce input surge and support controlled rail startup.
Current limit, frequency foldback, and thermal shutdown improve fault tolerance.

Applications

Automotive Battery Regulation

Industrial Control

Use Scenario: Used in vehicle electronics powered from 12V battery rails.

IC Role: LT3500EDD#PBF steps down the battery input and can generate an auxiliary linear rail.

Use Value: Supports robust wide-input conversion and controlled startup.

Use Scenario: Used in PLC modules, factory controllers, and industrial communication boards.

IC Role: The IC converts 24V-style rails into regulated logic or analog supplies.

Use Value: Reduces regulator count while supporting high switching-frequency design.

Wall Transformer Regulation

Distributed Power Regulation

Use Scenario: Used in products powered from unregulated wall adapters.

IC Role: LT3500EDD#PBF regulates variable adapter inputs into stable embedded rails.

Use Value: Improves system tolerance to input variation.

Use Scenario: Used near local loads on embedded boards that distribute higher bus voltages.

IC Role: The buck channel creates the local high-current rail while the linear function supports auxiliary regulation.

Use Value: Supports compact point-of-load power design.

Equivalent & Alternatives

When evaluating a LT3500EDD#PBF equivalent, engineers should compare input-voltage range, 2A output capability, package, switching-frequency range, soft-start/tracking behavior, power-good comparator needs, and linear regulator/controller functionality.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LT3500EMSE#PBF	Same LT3500 regulator family in a thermally enhanced MSOP package.	Used when the design prefers MSOP footprint over DFN.	Choose according to PCB footprint, thermal path, and assembly preference.
LT3971 series	Different Analog Devices buck regulator family without the same integrated linear regulator/controller function.	Used when the design needs a simple wide-input buck regulator rather than dual-rail integration.	Compare auxiliary rail needs, output current, package, and compensation before substitution.

Compared with LT3500EMSE#PBF, LT3500EDD#PBF is selected when the 3mm x 3mm DFN footprint is required. LT3500EDD#PBF vs LT3971-style alternatives depends on whether the design needs the LT3500 linear regulator/controller and power-good comparator integration.

Quality

LT3500EDD#PBF should be sourced as original Analog Devices components through traceable and controlled supply channels. Quality checks may include DFN package inspection, top-mark validation, solderability testing, moisture handling review, and buck-output electrical verification.

Production validation should include output accuracy, startup ramp, soft-start/tracking behavior, synchronization behavior, linear regulator operation, short-circuit response, thermal performance, and switching-loop PCB layout review.

Availability

LT3500EDD#PBF available at Aetrix Electronics and is suitable for automotive, industrial, adapter-powered, distributed power, and compact embedded dual-rail designs.

Supply support may include volume procurement planning, scheduled delivery arrangements, traceable sourcing management, and long-term support for OEM and industrial electronics programs. Sample and NPI supply support, as well as urgent in-stock supply support, can also be arranged for prototype builds, pilot runs, and time-critical production needs.

For production builds, confirming DFN footprint, output-current requirement, switching-frequency plan, thermal constraints, lead time, lifecycle status, and sourcing continuity helps improve procurement stability.

Manufacturer

Analog Devices is a global semiconductor manufacturer specializing in analog ICs, power management, mixed-signal products, data converters, RF solutions, sensors, and embedded signal-chain technologies for industrial, communication, automotive, healthcare, and consumer applications.

The LT3500 product family is a wide-input monolithic step-down regulator series with an integrated linear regulator or controller, supporting automotive, industrial, adapter-powered, and distributed power designs that need a compact buck rail plus auxiliary regulation.

FAQ

What is LT3500EDD#PBF used for?

LT3500EDD#PBF is used for automotive battery regulation, industrial control, wall transformer regulation, distributed power systems, and embedded products needing a buck regulator plus auxiliary linear regulation.

Where can I find the LT3500EDD#PBF datasheet download?

The LT3500EDD#PBF datasheet is available from Analog Devices and includes input ratings, switching-regulator design details, linear regulator/controller information, package data, and application guidance.

What should be considered in LT3500EDD#PBF pinout design?

Designers should keep the switching loop compact, route feedback away from SW noise, use proper compensation components, place thermal copper under the exposed pad, and size external components for the programmed frequency.

Does LT3500EDD#PBF include a linear regulator?

Yes. The LT3500 includes an adjustable linear regulator or driver that can be used for a secondary rail or post-regulated output.

What are common LT3500EDD#PBF equivalent solutions?

Common alternatives include LT3500 same-family package variants and other wide-input buck regulators selected according to package, current rating, auxiliary rail needs, and PCB compatibility.

LT3500EDD#PBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 12-WFDFN Exposed Pad

Packaging:: Tube

Product Status:: Active

Topology:: Step-Down (Buck) (1), Linear (LDO) (1)

Number of Outputs:: 2

Frequency - Switching:: 500kHz ~ 2.4MHz

Voltage/Current - Output 1:: 0.8V ~ 38.9V, 2A

Voltage/Current - Output 2:: Adjustable, 13mA

Voltage/Current - Output 3:: -

w/LED Driver:: No

w/Supervisor:: No

w/Sequencer:: No

Voltage - Supply:: 3V ~ 36V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 12-DFN (3x3)

LT3500EDD#PBF FAQ

1.How can I place an order for LT3500EDD#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LT3500EDD#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LT3500EDD#PBF reliable?

The price and inventory of LT3500EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3500EDD#PBF is usually 5 days.

3.What payment methods are accepted for LT3500EDD#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3500EDD#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LT3500EDD#PBF?

LT3500EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LT3500EDD#PBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LT3500EDD#PBF?

For technical support, including LT3500EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3500EDD#PBF requirements.

6.How does Aetrix verify that LT3500EDD#PBF is sourced from the original manufacturer or authorized distributors?

All LT3500EDD#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT3500EDD#PBF meets industry standards.

7.What is the process for return or replacement of LT3500EDD#PBF?

All LT3500EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3500EDD#PBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LT3500EDD#PBF part is unused and in its original packaging.

Return procedure for LT3500EDD#PBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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