LM3404HVMR

1A Constant-Current Buck LED Driver, 6V-75V In, PWM Dimming, SO-PowerPAD-8

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Manufacturer Part：

LM3404HVMR

Package：

SO PowerPAD-8 (HVSOIC-8), 6.1 x 5.0 x 1.6 mm

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Description

Product Overview

The LM3404HVMR is a high-voltage constant-current buck regulator designed specifically for driving high-power LEDs. Operating from a 6V to 75V input range, this device delivers up to 1A of constant output current with excellent line and load regulation. Featuring hysteretic (ripple) control for fast transient response and simple design, the LM3404 eliminates the need for compensation networks. PWM dimming capability allows precise brightness control with dimming ratios up to 1000:1. The SO PowerPAD-8 package provides superior thermal performance, making it ideal for architectural lighting, automotive lighting, and industrial LED driver applications.

Key Specifications

Parameter Value
Manufacturer Texas Instruments
Part Number LM3404HVMR
Product Category LED Drivers (Constant Current)
Topology Buck (Step-Down) Constant Current
Input Voltage Range 6V to 75V
Output Current Up to 1A (set by sense resistor)
Switching Frequency ~500kHz typical (hysteretic)
LED String Voltage Up to ~70V (depending on VIN)
Dimming Method PWM dimming (up to 1000:1 ratio)
Current Sensing Low-side sense resistor
Package / Case SO PowerPAD-8 (HVSOIC-8)
Operating Temperature -40°C to +125°C

Features

  • Wide 6V to 75V input voltage range (HV version)
  • Constant output current up to 1A (set by external resistor)
  • Hysteretic (ripple) control for fast transient response
  • No compensation network required
  • PWM dimming with up to 1000:1 dimming ratio
  • 1.25V reference for high current accuracy
  • Integrated 75V N-MOSFET power switch
  • SO PowerPAD-8 package for excellent thermal performance
  • Thermal shutdown and current limit protection
  • Low shutdown current: <10µA

Applications

  • Architectural and decorative LED lighting
  • Automotive exterior and interior lighting
  • Industrial LED lighting and signage
  • Constant-current LED driver modules
  • MR16 and high-voltage LED retrofit lamps

The LM3404HVMR is a high-voltage constant-current buck regulator specifically designed for driving high-power LEDs. Part of Texas Instruments extensive LED driver portfolio, the LM3404HV is the high-voltage version supporting input voltages from 6V to 75V, making it suitable for a wide range of LED lighting applications from low-voltage automotive systems to high-voltage industrial lighting.

The LM3404 uses a hysteretic (ripple) control architecture that provides inherent stability and fast transient response without the need for external compensation networks. This greatly simplifies design and reduces component count. The output current is accurately regulated by sensing the voltage across a low-side current sense resistor, with a 1.25V reference providing typical current accuracy of ±5%.

A dedicated DIM pin supports PWM dimming with ratios up to 1000:1, enabling precise brightness control for applications requiring wide dimming range. The PWM signal directly gates the output, turning the LED current on and off for true color dimming without shift in LED emission spectrum.

Packaged in an SO PowerPAD-8 (HVSOIC-8) with exposed thermal pad, the LM3404HVMR provides efficient heat dissipation for reliable operation at high currents and voltages. The device also features thermal shutdown, undervoltage lockout, and cycle-by-cycle current limit for robust operation under fault conditions.

The LM3404HV is a hysteretic (ripple-controlled) buck LED driver with the following operation:

1. Hysteretic Control Architecture: Unlike conventional PWM controllers with a fixed clock, the LM3404 uses hysteretic control. The power switch turns on when the inductor current (sensed across R_SNS) drops below the lower threshold, and turns off when it rises above the upper threshold. This creates a self-oscillating loop that maintains the average LED current at the desired level.

2. Current Sensing and Regulation: A low-side sense resistor (R_SNS) between the LED cathode and ground develops a voltage proportional to the LED current. This voltage is compared against the internal 1.25V reference through a comparator with hysteresis. The nominal LED current is I_LED = 1.25V / R_SNS.

3. Power Switching: When the switch is on, current flows from VIN through the internal N-MOSFET, inductor, LED string, and sense resistor to ground. The inductor current ramps up. When the switch turns off, the inductor current continues through the freewheeling Schottky diode and the LED string, maintaining forward current through the LEDs.

4. PWM Dimming: When the DIM pin is pulled low, the power switch is disabled and the LED current drops to zero. When DIM is high, normal regulation resumes. The LED current rises and falls quickly, enabling high dimming ratios with fast edges. Dimming frequency can be from 100Hz to several kHz.

5. Protection Features: Cycle-by-cycle current limit prevents excessive switch current. Thermal shutdown disables the device at high junction temperatures. Undervoltage lockout ensures proper operation only when VIN is above the minimum threshold.

Pin Name Type Description
1 BOOT Input Bootstrap capacitor input. Provides gate drive voltage above VIN for the high-side N-MOSFET. Connect 0.047µF capacitor from BOOT to SW.
2 VIN Power Input Input voltage supply (6V to 75V). Bypass with 1µF ceramic capacitor to GND, placed close to pin.
3 DIM Input PWM dimming control input. Drive with PWM signal for LED brightness control. 0.4V threshold, <10µA input current.
4 CSN Input Current sense negative input. Connect to the ground side of the sense resistor (R_SNS).
5 CSP Input Current sense positive input. Connect to the LED cathode side of the sense resistor (R_SNS).
6 GND Ground Signal and power ground. Provide robust copper connection to ground plane.
7 SW Output Switch node. Connects to internal MOSFET source. Connect external Schottky diode cathode and inductor here.
8 SW Output Second switch node pin. Connected internally to Pin 7. Both pins connected together externally.
Pad DAP Thermal Exposed die attach pad. Connect to GND plane with multiple thermal vias for maximum heat dissipation.
  • High-voltage LED strings for architectural lighting
  • Automotive daytime running lights and tail lights
  • Industrial LED panel and downlight drivers
  • MR16 and GU10 LED retrofit lamp drivers
  • Constant-current LED driver modules (350mA, 700mA, 1A)
Manufacturer Part Number Package Notes
TI LM3404MR SO PowerPAD-8 Standard 42V input version
TI LM3409HV SO PowerPAD-8 1.2A with thermal foldback
TI LM3402HVMR SO PowerPAD-8 500mA lower current version
Macroblock MBI6651 SOIC-8 1.5A 60V alternative
Diodes Inc AL8860 SOIC-8 1.5A 36V alternative
Monolithic Power MP24893 SOIC-8 3A 55V synchronous option
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Quality Assurance

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

3. Industry Standard Compliance

Our products comply with a variety of international industry quality standards to adapt to high-standard application scenarios:
  • Automotive Electronics: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
  • Medical Devices: High-reliability components meet medical industry safety and compliance regulations, ensuring stable operation for medical equipment.
  • Industrial Control & Consumer Electronics: Products conform to universal international electronic industry standards, suitable for long-term continuous operation of various equipment.

4. Professional Reliability Control

For static-sensitive, moisture-sensitive and precision components such as ICs, PCBs, sensors and connectors, we carry out reliability screening in advance. Combined with standardized ESD anti-static packaging and vacuum moisture-proof packaging, we avoid component damage caused by static electricity, dampness or collision during storage and transportation, and retain the original performance of products.

5. Traceability Management System

We establish a complete product traceability system. Each batch of goods corresponds to independent batch number, sourcing record, inspection record and delivery record. Customers can query the whole lifecycle information of components at any time. This system effectively solves quality risks and facilitates after-sales handling and production quality control for your company.

6. After-sales Quality Guarantee

If any product is confirmed to have non-conformity quality problems due to our reasons after receipt, we provide free return, exchange and supplementary delivery services. Our professional quality team will also conduct root cause analysis to optimize our quality control process. We respond to quality feedback within 24 hours to resolve your worries efficiently.

Contact Us

If you have inquiries about our quality standards, inspection procedures or product certification documents, please feel free to contact us:

 

Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

Shipping & Payment

Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

1. Payment Terms

We offer a variety of secure and convenient payment methods to meet diverse business cooperation needs. Details are as follows:
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    US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.

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We partner with leading global logistics providers to ensure safe and fast delivery worldwide. Relevant details are listed below:
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  1. Order Processing Time
  • In-stock items: Orders confirmed and fully paid before 14:00 (GMT+8) will be shipped on the same day. All other orders will be dispatched within 1 to 2 working days.
  • Out-of-stock or sourced items: The delivery lead time will be confirmed separately according to brand and inventory status.
  1. Estimated Transit Time
  • International Express: 3 – 7 working days globally
  • Air Freight: 7 – 12 working days
  • Sea Freight: 25 – 40 working days for heavy and large bulk cargo
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    Within 24 hours after dispatch, we will send the tracking number, commercial invoice, packing list and other documents to your email or communication account. You may check the shipment status online in real time.

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    We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.

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    All import duties, customs clearance fees and local taxes incurred for international shipments shall be borne by the buyer. We will provide complete customs documents to assist you with clearance procedures.

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  • In case of loss or severe damage during transit, please contact us within 48 hours after receiving the tracking information. We will assist you in filing a claim with the logistics provider.
  • We shall not be liable for any losses caused by incorrect delivery address, wrong contact information or the buyer’s refusal to complete customs clearance.

5. Local Pickup in Shenzhen

Local pickup service is available for customers in Shenzhen and surrounding areas:
  • Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
  • Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
  • Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.

Contact Information

Email: info@ic-vendor.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

Core Services

1. One-stop Sourcing & BOM Support

We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

3. Fast Quotation & Order Processing

Our customer service team responds promptly to inquiries and quotation requests. All in-stock orders will be processed within one working day. We provide stocking reservation services for long-term cooperative customers, effectively solving problems such as component shortages and unstable supply chains.

4. Professional Technical Support

Our senior engineer team provides free technical consultation, model selection guidance and original manufacturer datasheets. We assist customers in solving problems related to product R&D, circuit design and component application, providing reliable technical support for project progress.

5. Sourcing for Special Components

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6. Global Logistics & Document Services

We cooperate with mainstream international logistics providers including DHL, FedEx, UPS and TNT to achieve fast global delivery. We can provide complete export documents such as customs declaration files, commercial invoices and packing lists to ensure smooth customs clearance for international shipments. Local pickup is also available for customers in Shenzhen, China.

Professional Packaging Standards

Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

1. General Packaging Specifications

  • All components are packed separately to avoid damage caused by friction and collision;
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2. Classified Professional Packaging

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  • Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
  • Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
  • Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

3. Custom Packaging Services

We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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