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Texas Instruments LM3402HVMRX/NOPB
- Part No.:
- LM3402HVMRX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3402HVMRX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:5,409
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Product details
Overview
LM3402HVMRX/NOPB from Texas Instruments is a monolithic 0.5-A constant-current buck regulator with integrated 735-mA N-channel MOSFET, 6–75 V input range, 200-mV current-sense threshold, and hysteretic controlled ON-time architecture-designed specifically to drive high-power LED arrays in automotive headlamps and industrial lighting systems.
For engineers reviewing the LM3402HVMRX/NOPB datasheet, LM3402HVMRX/NOPB pinout, LM3402HVMRX/NOPB application, or LM3402HVMRX/NOPB equivalent, key selection criteria include VIN range compatibility (up to 75 V), thermal shutdown at 165°C, PWM dimming support via TTL-level DIM pin, and absence of control-loop compensation requirements.
Technical Context
The LM3402HVMRX/NOPB implements a controlled ON-time (COT) architecture combining hysteretic current regulation with a one-shot timer whose duration varies inversely with VIN and is set by an external RON resistor. This eliminates need for loop compensation while maintaining stable switching frequency in continuous conduction mode (CCM).
It integrates a 7-V internal linear regulator (VCC), bootstrap gate driver for high-side MOSFET, cycle-by-cycle current limiting at 735 mA (typ), and dual protection comparators: CS overvoltage (300 mV) for open-LED detection and thermal shutdown at 165°C with 25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 75 V - supports wide-input automotive and industrial DC bus voltages without pre-regulation. |
| Output Current | 500 mA over temperature - delivers stable LED current across –40°C to +125°C junction range. |
| CS Threshold | 200 mV ±3 mV - sets LED current via external sense resistor (e.g., 0.4 Ω yields 500 mA); low drift enables tight current accuracy. |
| Current Limit | 735 mA typical - provides robust short-circuit and overcurrent protection without external circuitry. |
| Switch RDS(on) | 0.7–1.5 Ω - integrated MOSFET reduces BOM count and improves efficiency vs. external switch solutions. |
| Thermal Shutdown | 165°C with 25°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Shutdown Current | 90–180 µA - enables ultra-low-power standby in battery-backed or energy-sensitive lighting systems. |
Pinout & Package
LM3402HVMRX/NOPB is housed in an 8-pin HSOP (DDA) package measuring 4.89 mm × 3.90 mm with exposed thermal pad (DAP) for enhanced power dissipation. The DAP must be soldered to PCB ground plane using 4–6 thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Connects to inductor and Schottky diode cathode; carries high-frequency pulsed current up to 735 mA. |
| BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 10-nF ceramic capacitor between BOOT and SW for floating bias generation. |
| DIM | PWM dimming input | TTL-compatible logic input (VIH = 2.2 V, VIL = 0.8 V); enables fast LED on/off control without affecting VCC bias. |
| GND | Power and signal ground | Common reference for CS, DIM, RON, and VCC; must be low-impedance connection to minimize noise coupling. |
| CS | Current sense feedback | Monitors voltage across external RSNS; comparator triggers MOSFET turn-on when VSNS falls below 200 mV. |
| RON | ON-time control | Resistor from RON to VIN sets tON; e.g., 200 kΩ yields ~380 ns at VIN = 70 V for LM3402HV variant. |
| VCC | Internal bias supply | 7-V regulated output (6.6–7.4 V); powers internal circuits; bypassed with ≥0.1-µF X5R/X7R ceramic capacitor. |
| VIN | Main input supply | Accepts 6–75 V DC; powers both internal regulator and high-side switch; includes UVLO at 5.25 V. |
Key Features
| Feature | Design Value |
|---|---|
| No compensation required | Hysteretic COT control eliminates external compensation network-reduces design time and component count. |
| Open-LED protection | CS overvoltage comparator trips at 300 mV to disable MOSFET if LED string opens-prevents uncontrolled VO rise. |
| All-ceramic output support | Stable operation with ceramic-only or capacitor-less outputs-enables compact, low-ESR, high-reliability designs. |
| Integrated 735-mA MOSFET | Reduces external component count and layout complexity versus controller-only solutions; RDS(on) ≤1.5 Ω. |
| PWM dimming with pull-up | 75 µA internal DIM pull-up ensures default-on operation; eliminates need for external pull-up resistor in most cases. |
Applications
| Automotive Headlamps | Industrial Machine Vision Lighting |
|---|---|
|
Use Scenario: High-intensity directional lighting for vehicle forward illumination under 12/24/48 V DC bus conditions. IC Role / Device Role / Timing Role: Constant-current buck regulator controlling series-connected white LEDs; maintains precise 500 mA despite battery voltage fluctuations and load transients. Use Value: Enables compliance with ECE/SAE photometric standards via stable current delivery and thermal shutdown at 165°C. |
Use Scenario: Bright, flicker-free illumination for high-speed camera inspection systems in factory automation. IC Role / Device Role / Timing Role: LED driver with PWM dimming interface synchronized to camera exposure timing; supports >1 kHz dimming without aliasing. Use Value: Delivers consistent light intensity across varying ambient temperatures and input voltage sags common in industrial power rails. |
| Outdoor Street Lighting | Commercial Architectural Accent Lighting |
|
Use Scenario: Outdoor LED luminaires powered from 48–72 V DC microgrids or PoE++ injectors. IC Role / Device Role / Timing Role: Primary current regulator for multi-string LED arrays; handles wide VIN (6–75 V) and withstands surge events per IEC 61000-4-5. Use Value: Eliminates need for input pre-regulators or wide-input DC/DC stages-reducing system cost and footprint. |
Use Scenario: Dimmable linear LED strips and recessed downlights in retail/hospitality environments. IC Role / Device Role / Timing Role: Constant-current source supporting 0–100% analog/PWM dimming; interfaces directly with DALI or 0–10 V controllers via optional level-shifting. Use Value: Provides smooth, low-noise dimming performance with <5% current ripple-critical for color consistency in high-CRI applications. |
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 |
|---|---|---|---|
| LM3402MRX/NOPB | Lower VIN max (42 V vs. 75 V); identical pinout, package, and functional architecture. | Suitable only for 12/24 V automotive or general-purpose lighting-not rated for 48 V+ industrial bus rails. | Select LM3402MRX/NOPB where input voltage remains ≤42 V and cost optimization is prioritized. |
| TPS92630QPWPRQ1 | Automotive-grade AEC-Q100 qualified; adds analog dimming, fault reporting, and higher accuracy (±1.5% current). | Requires external MOSFET; larger solution size; supports diagnostics for ASIL-B systems. | Choose TPS92630QPWPRQ1 for safety-critical automotive lighting requiring diagnostic coverage and tighter current tolerance. |
Compared with LM3402MRX/NOPB, LM3402HVMRX/NOPB extends input range to 75 V for compatibility with 48 V DC distribution systems, while TPS92630QPWPRQ1 trades integration for automotive qualification and diagnostic capability-making LM3402HVMRX/NOPB optimal for cost-sensitive, high-voltage industrial LED drivers without functional safety requirements.
Availability
LM3402HVMRX/NOPB is available at Aetrix Electronics and suitable for automotive headlamps, industrial machine vision lighting, and outdoor street lighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3402HVMRX/NOPB 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM3402HVMRX/NOPB belongs to TI's LED driver product line, engineered for high-efficiency, thermally robust constant-current regulation in demanding lighting applications-from automotive front lighting to commercial outdoor installations.
FAQ
What is the maximum input voltage supported by LM3402HVMRX/NOPB?
The LM3402HVMRX/NOPB supports a maximum input voltage of 75 V, as specified in its absolute maximum ratings and recommended operating conditions. This distinguishes it from the standard LM3402 (42 V max) and makes it suitable for 48 V DC distribution systems and industrial power rails. Operation above 75 V risks permanent device damage.
Does LM3402HVMRX/NOPB require external compensation components?
No, LM3402HVMRX/NOPB does not require external compensation components. Its controlled ON-time (COT) hysteretic architecture inherently stabilizes the control loop without needing resistors or capacitors for phase margin adjustment-reducing bill-of-materials count and simplifying layout.
How does LM3402HVMRX/NOPB handle open-LED fault conditions?
LM3402HVMRX/NOPB detects open-LED faults via its CS pin overvoltage comparator, which disables the internal MOSFET when the sense voltage exceeds 300 mV. This prevents uncontrolled output voltage rise and protects downstream components. The 200-mV regulation threshold and 300-mV OVP threshold provide built-in margin for safe fail-safe operation.
Can LM3402HVMRX/NOPB operate without an output capacitor?
Yes, LM3402HVMRX/NOPB supports capacitor-less operation due to its current-mode topology and direct inductor-to-LED connection. The device regulates LED current-not voltage-so no output capacitance is needed to maintain regulation. A small 10-nF capacitor across the LED array may be added to dampen ringing but is not required for stability.
What thermal management is required for LM3402HVMRX/NOPB in continuous 500-mA operation?
For continuous 500-mA operation at full load and high ambient temperature, LM3402HVMRX/NOPB requires proper thermal management via its exposed DAP pad. TI specifies RθJA = 45.6°C/W for the HSOP package; a 4–6 via thermal connection to a solid ground plane is mandatory to keep junction temperature below 125°C under worst-case conditions.
LM3402HVMRX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 500mA
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM3402HVMRX/NOPB FAQ
1.How can I place an order for LM3402HVMRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3402HVMRX/NOPB 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 LM3402HVMRX/NOPB reliable?
The price and inventory of LM3402HVMRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3402HVMRX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3402HVMRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3402HVMRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3402HVMRX/NOPB?
LM3402HVMRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3402HVMRX/NOPB 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 LM3402HVMRX/NOPB?
For technical support, including LM3402HVMRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3402HVMRX/NOPB requirements.
6.How does Aetrix verify that LM3402HVMRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3402HVMRX/NOPB 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 LM3402HVMRX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3402HVMRX/NOPB?
All LM3402HVMRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3402HVMRX/NOPB, 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 LM3402HVMRX/NOPB part is unused and in its original packaging.
Return procedure for LM3402HVMRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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