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Texas Instruments LM3402HVMMX
- Part No.:
- LM3402HVMMX
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3402HVMMX.pdf
- Description:
- IC LED DRV RGLTR PWM 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,903
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Product details
Overview
LM3402HVMMX 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 LM3402HVMMX datasheet, LM3402HVMMX pinout, LM3402HVMMX application, or LM3402HVMMX 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 implements a controlled-on-time (COT) architecture combining hysteretic current sensing with a one-shot timer whose duration scales inversely with VIN and is set by external RON. This enables stable constant-current regulation without external compensation while maintaining near-constant switching frequency in continuous conduction mode (CCM).
Its internal 7-V linear regulator powers control circuitry from VIN and activates above 5.25 V; the bootstrap driver (BOOT–SW) sustains gate drive during high-side switch conduction using a 10-nF external capacitor. The CS pin compares sensed voltage against a 200-mV reference, triggering MOSFET turn-on when current falls below regulation threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 75 V - supports wide-input automotive battery systems (cold crank to load dump) and industrial DC 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 as IF = 0.2 V / RSNS; low tolerance enables accurate current programming. |
| Current Limit | 735 mA typical - provides cycle-by-cycle protection against shorted LEDs or inductor saturation. |
| Min OFF-time | 300 ns - constrains maximum duty cycle and thus VO(MAX), enabling safe open-LED protection. |
| Thermal Shutdown | 165°C with 25°C hysteresis - disables MOSFET to prevent permanent damage during sustained overload or poor heatsinking. |
| Shutdown Current | 90 µA typical - enables ultra-low-power standby in lighting control systems requiring long-term energy efficiency. |
Pinout & Package
LM3402HVMMX 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 vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Connects to inductor and Schottky diode cathode; carries high-frequency pulsed current and requires tight layout routing. |
| BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 10-nF ceramic capacitor to SW for floating gate drive during conduction. |
| DIM | PWM dimming input | TTL-compatible logic input (VIH = 2.2 V, VIL = 0.8 V); enables fast LED on/off control without affecting bias circuitry. |
| GND | Power and signal ground | Common return for all analog and power paths; must be low-impedance and tied directly to DAP. |
| CS | Current sense feedback | Monitors voltage across RSNS; comparator triggers MOSFET turn-on when VSNS drops below 200 mV. |
| 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 | Internal bias supply | 7-V regulated output; bypass with ≥0.1-µF X5R/X7R ceramic capacitor close to pin for stable gate drive and control logic. |
| VIN | Main input supply | Accepts 6–75 V DC; powers internal LDO and supplies energy to switching path; includes UVLO at 5.25 V. |
Key Features
| Feature | Design Value |
|---|---|
| No compensation required | Hysteretic COT control eliminates need for external compensation network - reduces BOM count and design iteration time. |
| Capacitor-less output support | Direct inductor–LED series connection possible - removes ESR/aging concerns of output capacitors and simplifies thermal management. |
| Integrated 735-mA MOSFET | High-side N-channel switch with 1.5 Ω RDS(ON) max - eliminates external FET and gate driver, reducing footprint and layout complexity. |
| Built-in open-LED protection | CS overvoltage comparator trips at 300 mV - prevents runaway output voltage during LED string breakage or disconnection. |
| Thermal and current fault handling | Hiccup-mode current limiting and 165°C thermal shutdown - protects IC and external components under sustained fault conditions. |
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 transients up to 75 V. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED current via CS feedback; RON sets tON to maintain stable fSW across battery voltage variation. Use Value: Eliminates need for pre-regulator stage due to 75-V input rating; thermal shutdown prevents failure during under-hood overheating. |
Use Scenario: Powering multi-string LED arrays in warehouse lighting fixtures operating from 48-V DC distribution bus. IC Role / Device Role / Timing Role: Primary current source controlling parallel LED strings via individual RSNS resistors; DIM pin enables 0–100% PWM dimming at ≤1 kHz. Use Value: 500-mA output capability supports high-lumen density; capacitor-less operation avoids electrolytic capacitor lifetime limitations in hot environments. |
| Outdoor Streetlight Module | Commercial Signage Illumination |
|
Use Scenario: Outdoor-rated LED driver module exposed to –40°C to +85°C ambient with wide input fluctuations from solar-charged batteries. IC Role / Device Role / Timing Role: Robust current regulator with 125°C max TJ operation; BOOT/SW bootstrap ensures reliable gate drive across full temperature range. Use Value: 300-ns min off-time enables safe open-circuit response during LED wire bond failure; ESD-rated (±2 kV HBM) withstands field handling. |
Use Scenario: Compact LED backlight driver for channel letters and architectural signage requiring flicker-free dimming and low standby power. IC Role / Device Role / Timing Role: Low-quiescent-current (90 µA) shutdown controller activated via microcontroller GPIO; DIM pin retains fast wake-up latency. Use Value: Enables <100-µA system standby when signage is inactive; VSSOP package allows dense PCB layout in space-constrained 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 |
|---|---|---|---|
| LM3402MMX | 42-V max VIN, identical pinout and functionality except lower input voltage rating. | Suitable only for 12/24-V systems without load dump; cannot replace LM3402HVMMX in 48-V or automotive 75-V designs. | Select LM3402MMX only when input never exceeds 42 V and board space/layout reuse is critical. |
| MPQ4425HGJ-P | 45-V max VIN, integrated 1.2-A MOSFET, requires external compensation, no dedicated DIM pin (uses EN/PWM). | Lacks native TTL dimming interface; higher current capability but larger solution size due to compensation components. | Choose MPQ4425HGJ-P when >500-mA output or higher efficiency at light loads is required, accepting added design complexity. |
Compared with LM3402MMX, LM3402HVMMX enables direct use in 48-V industrial and 75-V automotive systems without derating; versus MPQ4425HGJ-P, it offers simpler layout, no compensation, and native PWM dimming-but at lower max current and input voltage ceiling than some newer alternatives.
Availability
LM3402HVMMX is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay lighting, and outdoor streetlight modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM3402HVMMX 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 for industrial, automotive, and lighting markets.
The LM3402HV product line was engineered specifically for robust, compact constant-current LED drivers in harsh environments-prioritizing wide VIN range, thermal resilience, and minimal external component count.
FAQ
What is the maximum input voltage supported by the LM3402HVMMX?
The LM3402HVMMX supports a maximum input voltage of 75 V, as specified in its absolute maximum ratings and recommended operating conditions. This rating enables direct operation from automotive 24-V systems experiencing load-dump transients and industrial 48-V DC buses. Exceeding 75 V risks permanent damage; the device includes internal protection but is not rated for sustained operation beyond this limit. Always verify transient voltage clamping in final system design.
Does the LM3402HVMMX require an external compensation network?
No, the LM3402HVMMX does not require external compensation components. Its controlled-on-time (COT) hysteretic architecture inherently stabilizes the current regulation loop without needing feedback capacitors or resistors. This simplifies layout, reduces bill-of-materials cost, and eliminates tuning iterations associated with traditional voltage-mode or current-mode controllers. The design relies solely on the CS pin's 200-mV reference and RON resistor for timing control.
How does the LM3402HVMMX handle open-circuit LED failures?
The LM3402HVMMX detects open-circuit LED conditions via its CS pin overvoltage comparator, which trips at 300 mV. When an LED string opens, VSNS collapses, causing the controller to command maximum duty cycle-raising output voltage until the CS comparator disables the MOSFET. This limits VO(MAX) to a safe value determined by minimum off-time and input voltage, preventing destructive overvoltage. External Zener-based clamping (e.g., Figure 18 in datasheet) adds further protection.
Can the LM3402HVMMX operate without an output capacitor?
Yes, the LM3402HVMMX supports capacitor-less LED drive configurations. Because it regulates current-not voltage-the inductor and LED form a natural current-source path. Removing the output capacitor reduces component count, eliminates ESR-related losses and aging effects, and improves reliability in high-temperature environments. A small 10-nF capacitor across the LED array may be added to dampen ringing, but it is not required for basic regulation.
What is the purpose of the RON pin on the LM3402HVMMX?
The RON pin on the LM3402HVMMX sets the controlled on-time (tON) of the internal MOSFET via an external resistor connected to VIN. The relationship is tON = 1.34×10⁻¹⁰ × RON / VIN, allowing designers to program switching frequency and define maximum output voltage (VO(MAX)). RON also serves as the shutdown enable pin: grounding it places the device in low-power mode (IIN-SD ≈ 90 µA), making it ideal for system-level power sequencing.
LM3402HVMMX 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:
- Obsolete
- 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 FAQ
1.How can I place an order for LM3402HVMMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3402HVMMX 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 reliable?
The price and inventory of LM3402HVMMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3402HVMMX is usually 5 days.
3.What payment methods are accepted for LM3402HVMMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3402HVMMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3402HVMMX?
LM3402HVMMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3402HVMMX 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?
For technical support, including LM3402HVMMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3402HVMMX requirements.
6.How does Aetrix verify that LM3402HVMMX is sourced from the original manufacturer or authorized distributors?
All LM3402HVMMX 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 meets industry standards.
7.What is the process for return or replacement of LM3402HVMMX?
All LM3402HVMMX units undergo pre-shipment inspection (PSI). If there is an issue with LM3402HVMMX, 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 part is unused and in its original packaging.
Return procedure for LM3402HVMMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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