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Texas Instruments LM3404HVMR
- Part No.:
- LM3404HVMR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3404HVMR.pdf
- Description:
- IC LED DRV RGLTR PWM 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,789
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Product details
Overview
LM3404HVMR from Texas Instruments is a monolithic 1-A constant-current buck regulator IC designed for driving high-power LED arrays in automotive and industrial lighting systems. It integrates a high-side N-channel MOSFET (RDS(on) = 0.75 Ω typ), operates from 6 V to 75 V input, delivers up to 1.2-A output current, features cycle-by-cycle current limiting, and supports PWM dimming via the DIM pin - enabling precise brightness control in headlamp and signage applications.
For engineers reviewing the LM3404HVMR datasheet, LM3404HVMR pinout, LM3404HVMR application, or LM3404HVMR equivalent, key selection considerations include its 75-V max input rating, 200-mV CS reference threshold, SO PowerPAD™-8 thermal performance (RθJB = 24.5 °C/W), hysteretic controlled-on-time architecture, and open-LED protection capability.
Technical Context
The LM3404HVMR uses a Controlled On-Time (COT) architecture combining hysteretic valley-current sensing with an external RON-programmable one-shot timer - eliminating need for loop compensation. Its CS pin compares sensed voltage across RSNS to a 200-mV internal reference to regulate LED current, while the BOOT/SW bootstrap circuit enables high-side MOSFET drive with 20-ns typical rise/fall times.
It incorporates integrated thermal shutdown (165°C trip, 25°C hysteresis), VCC linear regulator (7-V output, 5.3-V UVLO), and dual overvoltage/overcurrent protection on the CS pin (300-mV threshold). The device requires continuous conduction mode (CCM) operation and supports capacitor-less LED outputs via inherent inductor-current control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 75 V - supports wide-input automotive battery systems (12 V/24 V/48 V) and industrial DC rails without pre-regulation. |
| Output Current | Up to 1.2 A - sufficient for single high-power LED strings or multi-LED arrays with proper heatsinking. |
| CS Reference Voltage | 200 mV ±3 mV - sets LED current as IF = 0.2 V / RSNS; low tolerance enables ±1.5% current accuracy at nominal conditions. |
| Switch RDS(on) | 0.75 Ω (typ) - limits conduction loss at 1.2 A to ~1.08 W, requiring thermal management in high-duty-cycle designs. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects die during overload or poor PCB layout; resumes operation only after junction cools below 140°C. |
| Min Off-time | 270 ns - constrains maximum duty cycle and thus maximum regulated output voltage (e.g., ~68 V at 70 V input). |
| VCC Regulator | 7 V ±0.6 V - powers internal circuitry; bypassed by ≥0.1-µF ceramic capacitor; activates at 5.3 V, shuts down below 5.15 V. |
Pinout & Package
LM3404HVMR is housed in an 8-pin SO PowerPAD™ package (3.90 mm × 4.89 mm) with exposed thermal pad (DAP) that must be soldered to PCB ground plane using 4–6 thermal vias for optimal thermal performance (RθJB = 24.5 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Connects to inductor and Schottky diode cathode; carries high dI/dt switching current; requires tight layout and low-inductance routing. |
| BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 10-nF ceramic capacitor to SW to sustain gate voltage during on-state. |
| DIM | PWM dimming input | TTL-compatible logic input (VIL ≤ 0.8 V, VIH ≥ 2.2 V); enables fast LED on/off control without disabling bias circuitry. |
| GND | Power and signal ground | Reference for all analog and digital functions; must be low-impedance connection to system ground plane. |
| CS | Current sense feedback | Monitors voltage across RSNS; comparator triggers switch turn-off when VCS ≥ 200 mV; also provides OVP/OCP at 300 mV. |
| RON | On-time control | Resistor from RON to VIN sets tON; determines switching frequency and max output voltage capability. |
| VCC | Internal bias supply | 7-V regulated output; powers gate driver and control logic; must be bypassed locally with ≥0.1-µF X5R/X7R ceramic capacitor. |
| VIN | Main power input | Accepts 6–75 V DC; supplies both power stage and internal LDO; includes undervoltage lockout and bypass threshold. |
Key Features
| Feature | Design Value |
|---|---|
| No compensation required | Hysteretic COT control eliminates external compensation network - reduces BOM count and design iteration time. |
| All-ceramic or capacitor-less output | Supports stable operation with only ceramic output capacitors or zero output capacitance - simplifies EMI filtering and lowers cost. |
| Integrated 1-A MOSFET | Reduces external component count and board space; eliminates gate driver design; enables compact LED driver solutions. |
| Separate PWM dimming & shutdown | DIM pin enables flicker-free brightness control; RON pin allows independent low-power shutdown (IIN-SD = 95–180 µA). |
| Open-LED protection | CS pin OVP comparator disables switch if VSNS exceeds 300 mV - prevents destructive overvoltage during LED string breakage. |
Applications
| Automotive Headlamps | Industrial Machine Vision Lighting |
|---|---|
Use Scenario: High-intensity directional lighting for vehicle forward illumination under varying battery voltage (9–16 V) and temperature (-40°C to +125°C). IC Role / Device Role / Timing Role: Constant-current buck controller regulating 700 mA–1.2 A through 3–6 series-connected white LEDs; maintains luminous flux despite input transients. Use Value: Enables compliance with ECE/SAE photometric standards via precise current regulation and thermal foldback at junction >125°C. | Use Scenario: Stroboscopic high-brightness illumination synchronized with camera exposure in automated inspection systems. IC Role / Device Role / Timing Role: Fast-response current source delivering 1-A pulses with <1 µs DIM pin latency; supports PWM dimming up to 2 kHz without aliasing. Use Value: Eliminates need for external current-sense amplifiers or gate drivers - reduces system latency and component count in real-time vision systems. |
| Commercial Signage Backlighting | Streetlight LED Driver Module |
Use Scenario: Energy-efficient edge-lit channel letters powered from 24–48 V DC distribution bus in outdoor advertising displays. IC Role / Device Role / Timing Role: Single-chip constant-current driver powering 10–20 series LEDs per string; supports analog dimming via RON and digital dimming via DIM. Use Value: Delivers ±3% current matching across multiple strings using matched RSNS, enabling uniform luminance without active current balancing. | Use Scenario: Outdoor LED streetlight operating from 120–305 V AC rectified to 350–450 V DC bus with wide ambient temperature range. IC Role / Device Role / Timing Role: Primary-stage buck controller stepping down high-voltage DC to drive 350–700 mA LED loads; paired with upstream PFC stage. Use Value: Leverages 75-V absolute max rating and robust thermal design (SO PowerPAD™) to sustain 100,000-hour lifetime in thermally constrained pole-mounted enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3404MR | Lower 42-V max input rating; identical pinout, package, and functional architecture. | Suitable only for 12 V/24 V systems; not rated for 48 V+ industrial or streetlight inputs. | Select LM3404MR only when input voltage remains ≤42 V; otherwise LM3404HVMR ensures margin and reliability. |
| MPQ4425HGQ-A | 40-V max input; integrated current-sense amplifier; requires external compensation; QFN-16 package. | Higher integration but different footprint and control methodology; lacks capacitor-less operation support. | Choose MPQ4425HGQ-A only when needing built-in current monitoring or higher efficiency at light load; LM3404HVMR offers simpler layout and proven robustness in harsh environments. |
Compared with LM3404MR and MPQ4425HGQ-A, LM3404HVMR uniquely combines 75-V input tolerance, no-compensation COT control, SO PowerPAD™ thermal performance, and open-LED protection - making it the preferred choice for automotive, industrial, and outdoor LED systems demanding reliability across wide voltage and temperature ranges.
Availability
LM3404HVMR is available at Aetrix Electronics and suitable for automotive lighting, industrial machine vision systems, and outdoor streetlight modules requiring stable component supply and long-term manufacturability.
Supply support for LM3404HVMR 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with broad industrial and automotive focus.
The LM3404HVMR belongs to TI's high-voltage LED driver product line, engineered specifically for robust, thermally efficient constant-current regulation in automotive headlamps, commercial signage, and outdoor lighting where input voltage variation and thermal stress are critical design constraints.
FAQ
What is the maximum input voltage supported by LM3404HVMR?
The LM3404HVMR supports a maximum input voltage of 75 V, as specified in its Absolute Maximum Ratings table. This rating enables reliable operation in 48 V industrial systems and rectified AC inputs up to ~350 VDC when used with appropriate front-end conditioning. Exceeding 75 V risks permanent damage, and recommended operating range is 6 V to 75 V.
Does LM3404HVMR require external compensation components?
No, LM3404HVMR does not require external compensation components due to its Controlled On-Time (COT) hysteretic control architecture. The internal comparator and one-shot timer eliminate the need for loop compensation networks, simplifying design and improving transient response. This is confirmed in the Features section and Detailed Description of the official datasheet.
How is LED current set in LM3404HVMR circuits?
LED current in LM3404HVMR circuits is set by the current-sense resistor RSNS connected between the CS pin and ground. The device regulates current so that voltage at CS equals its internal 200-mV reference, yielding IF = 0.2 V / RSNS. For example, a 0.2-Ω resistor sets 1.0 A output current. This relationship is explicitly defined in the Electrical Characteristics and Application Information sections.
Can LM3404HVMR operate without an output capacitor?
Yes, LM3404HVMR supports capacitor-less LED outputs, as stated in its Features and Application Information sections. Because it regulates LED current directly via inductor current control, no output capacitor is needed to maintain regulation - reducing cost, size, and failure points. A small 10-nF capacitor across the LED array may be added to dampen ringing.
What thermal management is required for LM3404HVMR in 1.2-A operation?
At 1.2-A output, LM3404HVMR dissipates ~1.08 W in the integrated MOSFET (RDS(on) = 0.75 Ω). To maintain junction temperature ≤125°C, the SO PowerPAD™ package requires connection of the DAP thermal pad to a solid ground plane using 4–6 thermal vias. With this layout, RθJB = 24.5 °C/W enables safe operation at ambient up to 95°C - verified in Thermal Information tables.
LM3404HVMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 75V
- Voltage - Output:
- 73V
- Current - Output / Channel:
- 1A
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM3404HVMR FAQ
1.How can I place an order for LM3404HVMR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3404HVMR 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 LM3404HVMR reliable?
The price and inventory of LM3404HVMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3404HVMR is usually 5 days.
3.What payment methods are accepted for LM3404HVMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3404HVMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3404HVMR?
LM3404HVMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3404HVMR 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 LM3404HVMR?
For technical support, including LM3404HVMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3404HVMR requirements.
6.How does Aetrix verify that LM3404HVMR is sourced from the original manufacturer or authorized distributors?
All LM3404HVMR 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 LM3404HVMR meets industry standards.
7.What is the process for return or replacement of LM3404HVMR?
All LM3404HVMR units undergo pre-shipment inspection (PSI). If there is an issue with LM3404HVMR, 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 LM3404HVMR part is unused and in its original packaging.
Return procedure for LM3404HVMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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