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Texas Instruments LM3402HVMMX/NOPB
- Part No.:
- LM3402HVMMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3402HVMMX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LM3402HVMMX/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 strings 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 LM3402HVMMX/NOPB datasheet, LM3402HVMMX/NOPB pinout, LM3402HVMMX/NOPB application, or LM3402HVMMX/NOPB equivalent, key selection considerations include its 75-V max input rating, thermal shutdown at 165°C, 300-ns minimum off-time limiting VO(MAX), RON-programmable on-time, and support for ceramic-output or capacitor-less LED configurations.
Technical Context
The LM3402HVMMX/NOPB implements a controlled-on-time (COT) buck topology combining hysteretic valley-current sensing with a one-shot on-timer inversely proportional to VIN and set by external RON. This architecture maintains stable switching frequency in continuous conduction mode (CCM) while enabling fast transient response and eliminating need for external compensation.
It integrates a 7-V internal linear regulator (VCC), bootstrap gate driver for high-side MOSFET, cycle-by-cycle current limit at 735 mA (typ), overvoltage protection triggered at 300 mV on CS pin, and dedicated DIM pin with 75 µA internal pullup for direct PWM dimming without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 75 V - Enables direct operation from 12/24/48 V automotive and industrial bus rails without pre-regulation. |
| Output Current | 500 mA over temperature - Delivers stable LED drive current across –40°C to +125°C junction range. |
| CS Threshold | 200 mV ±3 mV - Sets LED current via RSNS = 0.2 V / IF; enables <±1% current accuracy with low-drift resistor. |
| Current Limit | 735 mA typical - Provides robust short-circuit and overcurrent protection; triggers hiccup-mode recovery. |
| Thermal Shutdown | 165°C with 25°C hysteresis - Prevents permanent damage during sustained overload or poor heatsinking. |
| Switch RDS(on) | 0.7 Ω typical - Minimizes conduction loss in integrated MOSFET; supports >90% efficiency at full load. |
| Min OFF-time | 300 ns - Constrains maximum duty cycle and thus VO(MAX); critical for open-LED fault voltage clamping. |
Pinout & Package
LM3402HVMMX/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; requires tight layout. |
| BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 10-nF ceramic capacitor to SW for floating gate drive voltage generation. |
| DIM | PWM dimming input | TTL-compatible logic input (VIH = 2.2 V, VIL = 0.8 V); 75 µA internal pullup ensures default ON state. |
| GND | Power ground | Analog and power return; must be low-impedance connection to system ground plane. |
| CS | Current sense feedback | Monitors voltage across RSNS; comparator trips at 200 mV to regulate LED current; requires clean analog routing. |
| RON | On-time control | Resistor from RON to VIN sets tON per tON = 1.34×10⁻¹⁰ × RON/VIN; determines switching frequency and VO(MAX). |
| VCC | Bias regulator output | 7-V internal LDO output; bypass with 0.1-µF X5R/X7R ceramic capacitor close to pin; powers internal circuitry. |
| VIN | Main input supply | Accepts 6–75 V DC; powers internal VCC regulator and high-side switch; requires local CIN ≥1 µF ceramic. |
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 LED output support | Direct inductor-to-LED connection enabled by current-mode regulation; removes need for output electrolytic capacitor. |
| Integrated 735-mA N-channel MOSFET | Reduces external component count and PCB area; eliminates gate driver design; optimized for buck LED topology. |
| Separate PWM dimming and shutdown | DIM pin controls LED brightness; RON grounding enables ultra-low 90-µA shutdown current without affecting DIM function. |
| Built-in open-LED protection | CS comparator's 300-mV overvoltage threshold limits VO(MAX) during open-circuit failure, preventing overvoltage stress. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving 3–6 series-connected white LEDs (VF ≈ 3.2–3.6 V each) from 12–48 V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Constant-current buck controller regulating 350–500 mA through LED string; uses RON to set ~500 kHz switching for EMI compliance. Use Value: 75-V input rating withstands load-dump transients up to ±65 V; thermal shutdown protects against headlamp enclosure overheating. |
Use Scenario: Powering multi-string LED arrays (e.g., 12–24 LEDs in series-parallel) in warehouse fixtures powered from 277-V AC rectified bus. IC Role / Device Role / Timing Role: Primary current regulator per string; leverages 200-mV CS threshold for tight current matching across parallel channels. Use Value: Supports capacitor-less output to eliminate electrolytic aging in high-temperature environments; 125°C max operating junction enables compact heatsink design. |
| Streetlight LED Module | Commercial Display Backlight |
|
Use Scenario: Outdoor LED streetlight requiring IP67-rated, long-life driver with surge immunity and wide ambient temperature range (–40°C to +85°C). IC Role / Device Role / Timing Role: Core buck controller with programmable on-time; uses external Zener clamp on CS for open-LED fail-safe behavior. Use Value: 165°C thermal shutdown prevents field failures under solar heating; 75-V rating accommodates 48-V telecom backup systems. |
Use Scenario: Dimmable backlight for retail signage using PWM dimming at 200–1000 Hz to avoid visible flicker and enable smooth brightness control. IC Role / Device Role / Timing Role: Constant-current source with TTL-level DIM interface; internal 75-µA pullup eliminates external resistor for simplified layout. Use Value: Fast turn-on/off response (<1 µs) ensures accurate dimming duty cycle reproduction; low 90-µA shutdown current extends battery life in portable displays. |
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 |
|---|---|---|---|
| LM3402MMX/NOPB | 42-V max VIN, identical pinout and functionality; lower voltage rating reduces cost but excludes 48-V+ systems. | Suitable for 12/24-V automotive interior lighting and low-voltage industrial fixtures only. | Select when input never exceeds 42 V; offers same thermal performance and feature set at lower price point. |
| TPS92630QPWPRQ1 | Automotive-grade AEC-Q100 qualified; 65-V max VIN; integrated PWM generator; no RON pin; higher quiescent current. | Targeted at ASIL-B compliant headlamps requiring functional safety diagnostics and built-in dimming control. | Choose for automotive exterior lighting requiring qualification and diagnostic capability; not pin-compatible with LM3402HVMMX/NOPB. |
Compared with LM3402MMX/NOPB, the LM3402HVMMX/NOPB adds 33 V of input headroom for 48-V and telecom applications, while TPS92630QPWPRQ1 trades programmability and simplicity for automotive qualification and integrated PWM-making LM3402HVMMX/NOPB optimal for cost-sensitive, high-input-voltage industrial LED drivers.
Availability
LM3402HVMMX/NOPB is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay luminaires, and outdoor streetlight modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM3402HVMMX/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 specializing in analog and embedded processing technologies, with leadership in power management ICs and LED driver innovation since 2006.
The LM3402HV product line was engineered specifically for high-reliability constant-current LED driving in harsh environments, emphasizing wide-input-voltage operation, thermal robustness, and minimal external component count.
FAQ
What is the maximum input voltage supported by the LM3402HVMMX/NOPB?
The LM3402HVMMX/NOPB supports a maximum input voltage of 75 V, as specified in its absolute maximum ratings. This allows direct operation from 48-V industrial buses and 277-V AC rectified supplies with appropriate derating. Exceeding 75 V risks permanent damage; the device includes internal protection but is not rated for transient spikes beyond this limit. Always verify actual system rail voltage including surges before final design.
How does the RON pin set switching frequency in the LM3402HVMMX/NOPB?
The RON pin on the LM3402HVMMX/NOPB sets the controlled on-time (tON) via an external resistor to VIN, following tON = 1.34×10⁻¹⁰ × RON/VIN. Since tOFF-MIN is fixed at 300 ns, switching frequency fSW ≈ 1/(tON + 300 ns). For example, with RON = 200 kΩ and VIN = 40 V, tON ≈ 670 ns and fSW ≈ 1.03 MHz. This relationship enables precise frequency tuning without compensation networks.
Can the LM3402HVMMX/NOPB operate without an output capacitor?
Yes, the LM3402HVMMX/NOPB is explicitly designed to support capacitor-less LED outputs. Its current-mode regulation relies on inductor current ripple sensed at the CS pin, not output voltage stabilization. Removing CO reduces solution size, cost, and eliminates electrolytic aging-ideal for high-temperature or long-life applications. A small 10-nF capacitor across the LED string damps switching-node oscillation if needed.
What protection features does the LM3402HVMMX/NOPB include?
The LM3402HVMMX/NOPB integrates cycle-by-cycle current limiting (735 mA typ), thermal shutdown (165°C with 25°C hysteresis), input overvoltage lockout, BOOT undervoltage protection, and open-LED detection via CS pin's 300-mV overvoltage comparator. These functions operate autonomously without external components, ensuring robust operation during faults such as shorted LEDs, open circuits, or excessive ambient temperature.
Is the LM3402HVMMX/NOPB pin-compatible with the standard LM3402MMX/NOPB?
Yes, the LM3402HVMMX/NOPB is fully pin-compatible with the LM3402MMX/NOPB in the same VSSOP-8 (DGK) package. Both share identical pinout, electrical behavior, and functional modes. The only difference is the extended 6–75 V input range of the HV variant versus 6–42 V for the standard version-enabling drop-in replacement where higher input voltage is required.
LM3402HVMMX/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
LM3402HVMMX/NOPB FAQ
1.How can I place an order for LM3402HVMMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3402HVMMX/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 LM3402HVMMX/NOPB reliable?
The price and inventory of LM3402HVMMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3402HVMMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3402HVMMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3402HVMMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3402HVMMX/NOPB?
LM3402HVMMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3402HVMMX/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 LM3402HVMMX/NOPB?
For technical support, including LM3402HVMMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3402HVMMX/NOPB requirements.
6.How does Aetrix verify that LM3402HVMMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3402HVMMX/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 LM3402HVMMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3402HVMMX/NOPB?
All LM3402HVMMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3402HVMMX/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 LM3402HVMMX/NOPB part is unused and in its original packaging.
Return procedure for LM3402HVMMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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