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

Analog Devices Inc. LT3500HDD#PBF

Name: LT3500HDD#PBF
Brand: Analog Devices Inc.
SKU: LT3500HDD#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LT3500HDD#PBF

Manufacturer:: Analog Devices Inc.

Category:: Voltage Regulators - Linear + Switching

Package:: 12-WFDFN Exposed Pad

Datasheet:: LT3500HDD#PBF.pdf

Description:: IC REG DL BUCK/LINEAR 12DFN

Quantity:: RFQ Add To RFQ list

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Inventory:4,210

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Product details

Overview

LT3500HDD#PBF from Analog Devices is a monolithic 2A step-down DC-DC regulator with an integrated linear regulator or linear regulator controller. The device is designed for wide-input power systems that need an efficient buck rail plus an auxiliary low-noise or post-regulated output from a compact Linear Technology power IC.

As part of the LT3500 family, LT3500HDD#PBF combines a current-mode PWM buck regulator, internal 2.3A switch, 3V to 36V operating input range, adjustable 250kHz to 2.2MHz switching, soft-start/tracking, power-good comparator outputs, and a 13mA linear regulator/driver. For engineers reviewing the LT3500HDD#PBF datasheet, LT3500HDD#PBF pinout, LT3500HDD#PBF application, or LT3500HDD#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, LT3500HDD#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 resistor-programmable 250kHz to 2.2MHz oscillator lets designers balance efficiency, inductor size, thermal behavior, and EMI placement. Synchronization support is useful when several switching regulators must operate from a controlled system clock.

LT3500HDD#PBF also includes an internal NPN transistor with feedback control that can be configured as a linear regulator or controller, allowing a clean auxiliary rail to be generated near the switching output without adding a separate controller IC.

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, 40V maximum.
Buck Switch	Internal 2.3A switch supports up to 2A output capability.
Output Voltage	Buck output adjustable down to 0.8V.
Switching Frequency	Adjustable and synchronizable 250kHz to 2.2MHz fixed-frequency operation.
Linear Regulator / Driver	Adjustable linear regulator or controller with 13mA output capability.
Protection	Cycle-by-cycle current limit, frequency foldback, thermal shutdown, and short-circuit protection.
Package	HDD suffix indicates H-grade 12-lead DFN package option for higher-temperature applications.

Pinout & Package

The LT3500HDD#PBF pinout includes buck input, switching, boost-drive, feedback, compensation, synchronization, soft-start/tracking, power-good, linear regulator/controller, and thermal ground functions.

For PCB design, the input capacitor, catch-diode or switching-current path, inductor, and output capacitor should be kept close to the IC. Feedback and compensation nodes should be routed away from the SW node.

Pin / Function	PCB Design and Circuit Role
VIN	Wide-range input supply for the buck regulator.
SW	Switching node connected to the inductor; keep high-current loop compact.
BOOST	Bootstrap drive node for the internal switch.
FB	Feedback input setting the buck output voltage.
VC / COMP	Loop compensation node controlling stability and transient response.
RT / SYNC	Frequency programming or synchronization input.
SS / TRACK	Soft-start and output tracking control.
PG Outputs	Complementary power-good comparator outputs for supervision.
Linear Regulator Pins	Connections for auxiliary linear regulator or controller operation.
GND / Exposed Pad	Ground and thermal return path.

Key Features

2A buck output supports local embedded rails.
3V to 36V input range fits automotive and industrial supplies.
250kHz to 2.2MHz frequency range supports efficiency and size tradeoffs.
Linear regulator/controller adds an auxiliary rail.
Soft-start/tracking limits inrush and supports sequencing.
Current limit, foldback, and thermal shutdown improve robustness.

Applications

Automotive Battery Regulation

Industrial Control

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

IC Role: LT3500HDD#PBF creates a regulated buck rail and can support an auxiliary linear rail.

Use Value: Supports wide-input conversion with controlled startup.

Use Scenario: Used in PLCs, controllers, and instrumentation.

IC Role: Converts 24V-style rails into lower embedded supply rails.

Use Value: Improves power density and fault tolerance.

Wall Transformer Regulation

Distributed Power

Use Scenario: Used with unregulated adapter inputs.

IC Role: Maintains regulated output across input variation.

Use Value: Improves tolerance to adapter and load changes.

Use Scenario: Used near local loads on embedded boards.

IC Role: Creates point-of-load rails from a higher distributed bus.

Use Value: Reduces local regulator count and simplifies board power.

Equivalent & Alternatives

When evaluating a LT3500HDD#PBF equivalent, engineers should compare input voltage, 2A output capability, linear regulator/controller function, switching frequency, package, power-good outputs, and soft-start/tracking behavior.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LT3500EDD#PBF	Same LT3500 family in a 3mm x 3mm DFN package instead of the MSOP-style package option.	Used when the same power architecture can accept a smaller DFN footprint.	Choose according to thermal path, assembly process, and PCB footprint.
LT3971	Analog Devices wide-input buck regulator with different integration and without the same LT3500 linear regulator/controller structure.	Used when the design needs a simpler wide-input buck rail.	Compare auxiliary rail needs, output current, package, and compensation before substitution.

Compared with LT3500EDD#PBF, LT3500HDD#PBF should be selected when its package and assembly format match the target layout. LT3500HDD#PBF vs LT3971 selection depends on whether the design needs the integrated linear regulator/controller and power-good comparator functions.

Quality

LT3500HDD#PBF should be sourced as original Analog Devices components through traceable and controlled supply channels. Quality checks may include package inspection, top-mark validation, solderability testing, moisture handling review, and buck-output electrical verification.

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

Availability

LT3500HDD#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 supply support for OEM, industrial electronics, automotive electronics, and embedded product 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.

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 buck regulator series with an integrated linear regulator/controller, supporting embedded power designs that need a compact step-down rail plus auxiliary regulation.

FAQ

What is LT3500HDD#PBF used for?

LT3500HDD#PBF is used for automotive, industrial, adapter, and distributed power systems requiring a 2A buck regulator plus auxiliary linear regulation.

Where can I find the LT3500HDD#PBF datasheet download?

The LT3500HDD#PBF datasheet is available from Analog Devices and includes electrical characteristics, package data, pin descriptions, and application guidance.

What should be considered in LT3500HDD#PBF pinout design?

Designers should keep the SW loop compact, route FB and compensation away from switching noise, use proper thermal copper, and size external parts for the selected switching frequency.

Does LT3500HDD#PBF include a linear regulator?

Yes. The LT3500 includes an adjustable linear regulator or driver for an auxiliary or post-regulated rail.

What are common LT3500HDD#PBF equivalent solutions?

Common candidates include LT3500EDD#PBF and LT3971 depending on package, rail integration, and output-current requirements.

LT3500HDD#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 ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

LT3500HDD#PBF FAQ

1.How can I place an order for LT3500HDD#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LT3500HDD#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 LT3500HDD#PBF reliable?

The price and inventory of LT3500HDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3500HDD#PBF is usually 5 days.

3.What payment methods are accepted for LT3500HDD#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3500HDD#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LT3500HDD#PBF?

LT3500HDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LT3500HDD#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 LT3500HDD#PBF?

For technical support, including LT3500HDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3500HDD#PBF requirements.

6.How does Aetrix verify that LT3500HDD#PBF is sourced from the original manufacturer or authorized distributors?

All LT3500HDD#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 LT3500HDD#PBF meets industry standards.

7.What is the process for return or replacement of LT3500HDD#PBF?

All LT3500HDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3500HDD#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 LT3500HDD#PBF part is unused and in its original packaging.

Return procedure for LT3500HDD#PBF:

1.Submit a request within 90 days.

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

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