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Texas Instruments LM3402HVMM/NOPB
- Part No.:
- LM3402HVMM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3402HVMM/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,392
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Product details
Overview
LM3402HVMM/NOPB from Texas Instruments is a monolithic 0.5-A constant-current buck regulator with integrated 735-mA N-channel MOSFET, designed for driving high-power LED arrays in automotive and industrial lighting. It operates from 6 V to 75 V input, delivers precise 200-mV current-sense threshold regulation, supports PWM dimming via TTL-compatible DIM pin, and features hysteretic controlled-on-time (COT) architecture eliminating loop compensation.
For engineers reviewing the LM3402HVMM/NOPB datasheet, LM3402HVMM/NOPB pinout, LM3402HVMM/NOPB application, or LM3402HVMM/NOPB equivalent, key selection considerations include its 75-V max input rating, 300-ns minimum off-time limiting VO(MAX), thermal shutdown at 165°C, bootstrap-driven high-side switch, and compatibility with ceramic-output or capacitor-less LED configurations.
Technical Context
The LM3402HVMM/NOPB implements a controlled-on-time (COT) buck topology combining hysteretic current-mode control with a voltage-dependent one-shot timer. Its CS pin compares sensed voltage across RSNS against a 200-mV reference to trigger switching, while RON sets tON inversely proportional to VIN per tON = 1.34×10⁻¹⁰ × RON/VIN.
It integrates a 7-V internal linear regulator (VCC) with UVLO at 5.25 V, a floating gate driver powered by BOOT-SW bootstrap circuitry, cycle-by-cycle current limiting at 735 mA (typ), and dedicated overvoltage/overcurrent protection at 300 mV on CS - enabling open-LED fault tolerance without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 75 V - supports wide-input automotive battery systems and industrial DC rails without pre-regulation. |
| Output Current | 500 mA over temperature - stable LED drive current despite ambient or junction temperature variation up to 125°C. |
| CS Threshold | 200 mV ±6 mV - enables accurate current setting with low-value, high-precision sense resistors minimizing power loss. |
| Current Limit | 735 mA typical - provides robust short-circuit and overtemperature hiccup-mode protection without external sensing. |
| Switch RDS(on) | 0.7 Ω to 1.5 Ω - low conduction loss enables high efficiency in compact thermally constrained LED modules. |
| Thermal Shutdown | 165°C with 25°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Min OFF-time | 300 ns - defines maximum duty cycle and thus maximum output voltage VO(MAX) = VIN × tON/(tON + 300 ns). |
Pinout & Package
LM3402HVMM/NOPB is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm with exposed thermal pad (DAP) for enhanced thermal performance. 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 di/dt switching current and requires tight layout routing. |
| BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 10-nF ceramic capacitor between BOOT and SW for proper 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 or bias circuitry. |
| GND | Power and signal ground | Common return path for CS, RON, DIM, and VCC; must be low-impedance and tied directly to DAP thermal pad. |
| CS | Current sense feedback | Monitors voltage across RSNS; comparator triggers switch turn-on when VSNS falls below 200 mV (valley current control). |
| RON | ON-time programming | Resistor from RON to VIN sets tON; determines switching frequency and maximum regulated output voltage range. |
| VCC | Internal bias supply | 7-V regulated output; powers internal circuits; bypassed with 0.1-µF X5R/X7R ceramic capacitor close to pin. |
| VIN | Main input supply | Accepts 6–75 V; powers internal LDO and supplies energy to BOOT capacitor via internal diode during MOSFET off-time. |
Key Features
| Feature | Design Value |
|---|---|
| No control loop compensation required | Hysteretic COT architecture eliminates external compensation components, reducing BOM count and layout sensitivity. |
| Capacitor-less output support | Direct inductor-to-LED connection enabled by valley-current sensing and 300-ns min off-time, simplifying design and lowering cost. |
| Integrated 735-mA N-MOSFET | Eliminates external high-voltage switch; reduces footprint and improves reliability in space-constrained LED modules. |
| Separate PWM dimming and shutdown | DIM pin controls LED brightness; grounding RON enables ultra-low 90-µA shutdown current without disabling bias circuitry. |
| Built-in open-LED protection | CS OVP comparator at 300 mV disables switch if VSNS exceeds threshold - prevents uncontrolled VO(MAX) rise during LED string break. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 3–6 series-connected white LEDs in 12/24-V vehicle electrical systems with load dump immunity. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED current at 350–500 mA with programmable tON and thermal foldback. Use Value: 75-V input rating withstands ISO 7637-2 pulse 5a (load dump), while 165°C thermal shutdown protects against under-hood overheating. |
Use Scenario: Powering multi-string LED arrays in warehouse lighting fixtures operating from 48-V DC microgrids. IC Role / Device Role / Timing Role: Primary current regulator delivering stable 500 mA per channel with independent PWM dimming per fixture zone. Use Value: Supports capacitor-less output configuration to eliminate electrolytic capacitors - extending lifetime in high-temperature environments. |
| Commercial Streetlight Module | UV-C Disinfection System |
Use Scenario: Outdoor LED streetlights requiring long-life operation, wide input range, and robust open-circuit fault handling. IC Role / Device Role / Timing Role: Buck LED driver with Zener-based open-LED protection and 200-mV precision current sense for consistent lumen output. Use Value: Built-in 300-mV CS overvoltage comparator enables fail-safe open-LED detection without additional comparators or logic. |
Use Scenario: Driving high-forward-voltage UV-C LEDs (VF ≈ 7–8 V each) in sterilization equipment with strict current accuracy. IC Role / Device Role / Timing Role: Precision current source maintaining ±3% LED current across temperature using 200-mV reference and low-drift RSNS. Use Value: 0.7–1.5 Ω RDS(on) minimizes power loss at high VF strings, improving system efficiency and reducing heatsink requirements. |
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 |
|---|---|---|---|
| LM3402MM/NOPB | 42-V max VIN, identical pinout and functionality except lower input voltage rating. | Suitable only for 12/24-V systems; not rated for 48-V or load-dump-prone automotive applications. | Select LM3402MM/NOPB where input never exceeds 42 V and cost optimization is prioritized over voltage margin. |
| TPS92691QPWPRQ1 | Automotive-grade (AEC-Q100), 65-V max VIN, integrated current sense amplifier, analog + PWM dimming. | Requires external current sense resistor but offers higher accuracy (±1.5%) and diagnostic flags (open/short LED). | Choose TPS92691QPWPRQ1 for ASIL-B compliant designs needing diagnostics, higher accuracy, or extended temperature validation. |
Compared with LM3402HVMM/NOPB, LM3402MM/NOPB trades 33-V input headroom for cost reduction in low-voltage systems, while TPS92691QPWPRQ1 adds automotive qualification and diagnostics at the expense of higher BOM complexity and price.
Availability
LM3402HVMM/NOPB is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay lighting, and commercial streetlight systems requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LM3402HVMM/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 leader specializing in analog, embedded processing, and power management technologies with decades of LED driver innovation.
The LM3402HV product line was engineered specifically for high-reliability constant-current LED driving in harsh environments - emphasizing wide-input operation, integrated protection, and minimal external component count.
FAQ
What is the maximum input voltage supported by LM3402HVMM/NOPB?
The LM3402HVMM/NOPB supports a maximum input voltage of 75 V, as specified in its absolute maximum ratings and recommended operating conditions. This rating enables use in 48-V industrial systems and automotive applications subject to load dump transients. Exceeding 75 V risks permanent damage, and operation above 75 V is not guaranteed even briefly.
Does LM3402HVMM/NOPB require an external compensation network?
No, LM3402HVMM/NOPB does not require external compensation. Its controlled-on-time (COT) hysteretic architecture inherently stabilizes the control loop without feedback compensation components. This eliminates the need for external RC networks, simplifies layout, and improves robustness across input voltage and load variations.
How does LM3402HVMM/NOPB handle open-circuit LED failure?
LM3402HVMM/NOPB detects open-circuit LED failure via its CS pin overvoltage comparator, which disables the switch when VSNS exceeds 300 mV. This prevents uncontrolled output voltage rise. When combined with a Zener diode and resistor network, it clamps VO to a safe level, protecting downstream components and meeting IEC 62368-1 fault safety requirements.
Can LM3402HVMM/NOPB operate without an output capacitor?
Yes, LM3402HVMM/NOPB supports capacitor-less LED output configurations. Its valley-current sensing and 300-ns minimum off-time allow stable regulation with only an inductor and LED string. This reduces component count, eliminates electrolytic capacitor aging, and improves reliability in high-temperature applications like streetlights and industrial fixtures.
What thermal management is required for LM3402HVMM/NOPB at full 500-mA load?
At 500-mA continuous output, LM3402HVMM/NOPB requires a PCB with the exposed thermal pad (DAP) soldered to a solid ground plane using 4–6 thermal vias. With this layout, its junction-to-board thermal resistance is 25.8°C/W; maintaining TJ ≤125°C typically requires ≤25°C ambient or modest airflow. Thermal shutdown activates at 165°C to prevent damage during transient overload.
LM3402HVMM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-VSSOP
LM3402HVMM/NOPB FAQ
1.How can I place an order for LM3402HVMM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3402HVMM/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 LM3402HVMM/NOPB reliable?
The price and inventory of LM3402HVMM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3402HVMM/NOPB is usually 5 days.
3.What payment methods are accepted for LM3402HVMM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3402HVMM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3402HVMM/NOPB?
LM3402HVMM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3402HVMM/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 LM3402HVMM/NOPB?
For technical support, including LM3402HVMM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3402HVMM/NOPB requirements.
6.How does Aetrix verify that LM3402HVMM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3402HVMM/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 LM3402HVMM/NOPB meets industry standards.
7.What is the process for return or replacement of LM3402HVMM/NOPB?
All LM3402HVMM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3402HVMM/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 LM3402HVMM/NOPB part is unused and in its original packaging.
Return procedure for LM3402HVMM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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