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Texas Instruments LM3402MMX/NOPB
- Part No.:
- LM3402MMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3402MMX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,392
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Product details
Overview
LM3402MMX/NOPB from Texas Instruments is a monolithic 0.5-A constant-current buck regulator with integrated 0.7-Ω N-channel MOSFET, 200-mV current-sense reference, 6–42 V input range, and controlled ON-time (COT) hysteretic control-designed specifically to drive high-power LED strings in automotive headlamps and industrial lighting systems.
For engineers reviewing the LM3402MMX/NOPB datasheet, LM3402MMX/NOPB pinout, LM3402MMX/NOPB application, or LM3402MMX/NOPB equivalent, key selection considerations include its 300 ns minimum OFF-time for open-LED protection, PWM dimming compatibility via TTL-level DIM pin, thermal shutdown at 165°C, and support for ceramic-output or capacitor-less LED configurations.
Technical Context
The LM3402MMX/NOPB implements a controlled ON-time (COT) architecture combining hysteretic current regulation with a voltage-dependent one-shot timer, eliminating need for external loop compensation. Its CS pin compares sensed voltage across RSNS against a precise 200-mV reference to initiate each switching cycle.
Switching frequency is set by RON and VIN per tON = 1.34×10−10 × RON/VIN, enabling stable operation from ~100 kHz to >1 MHz. The internal 7-V VCC regulator powers gate drive and logic, with UVLO at 5.25 V and bypass threshold at 8.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 42 V - supports 12 V/24 V automotive and industrial DC bus inputs without pre-regulation. |
| Output Current | 500 mA max over temperature - delivers stable LED current despite junction temp up to 125°C. |
| CS Reference | 200 mV ±3 mV - sets LED current as IF = 0.2 V / RSNS; enables <±1% current accuracy with tight-tolerance sense resistor. |
| Current Limit | 735 mA typical - provides cycle-by-cycle peak current limiting to protect MOSFET and LEDs during transients or short circuits. |
| Shutdown Current | 90–180 µA - ultra-low IIN-SD enables battery-powered or always-on lighting systems with minimal standby loss. |
| Thermal Shutdown | 165°C with 25°C hysteresis - automatically disables switch until junction cools, preventing permanent damage under overload or poor heatsinking. |
| Min OFF-time | 300 ns - enforces hard upper limit on duty cycle, enabling reliable open-LED detection and output overvoltage clamping. |
Pinout & Package
LM3402MMX/NOPB is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm with exposed thermal pad (DAP) for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Connects to inductor and Schottky diode cathode; carries full switching current and high dv/dt - requires tight layout and Kelvin sensing. |
| BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 10-nF ceramic capacitor to SW to sustain gate voltage during conduction. |
| DIM | PWM dimming input | TTL-compatible (VIL ≤ 0.8 V, VIH ≥ 2.2 V); 75 µA internal pullup ensures default ON state when floating. |
| GND | Power ground | Reference for all analog and power circuits; must be low-impedance connection to system ground plane. |
| CS | Current sense input | Monitors voltage across external RSNS; comparator triggers switch turn-on when VCS falls below 200 mV. |
| RON | ON-time control | Resistor from RON to VIN sets tON; determines switching frequency and maximum duty cycle. |
| VCC | Bias regulator output | 7-V internal LDO output; bypass with 0.1-µF X5R/X7R ceramic capacitor close to pin for stable gate drive. |
| VIN | Main input supply | Accepts 6–42 V DC; powers internal circuitry and supplies energy to BOOT capacitor via internal diode. |
Key Features
| Feature | Design Value |
|---|---|
| No compensation required | Hysteretic COT control eliminates external compensation network - reduces BOM count and design iteration time. |
| Ceramic-capacitor compatible | Stable with all-ceramic output filters or zero-output-capacitor configurations - simplifies EMI filtering and lowers cost. |
| Open-LED protection | 300 ns minimum OFF-time prevents runaway duty cycle during LED string breakage - avoids overvoltage stress on components. |
| Integrated MOSFET | 0.7 Ω RDS(on) at 200 mA - eliminates external switch, reduces footprint, and improves thermal coupling between die and DAP. |
| Low-power shutdown | 90 µA IIN-SD with RON grounded - enables deep sleep mode for smart lighting controls without external enable IC. |
Applications
| Automotive Headlamps | Industrial Machine Vision Lighting |
|---|---|
|
Use Scenario: High-intensity directional lighting for vehicle forward illumination requiring robust thermal management and EMI compliance. IC Role / Device Role / Timing Role: Constant-current buck controller regulating 350–500 mA through 4–6 series-connected white LEDs. Use Value: 165°C thermal shutdown and 735 mA cycle-by-cycle current limit prevent catastrophic failure during load dump or cold crank events. |
Use Scenario: Stroboscopic LED arrays synchronized to camera exposure timing in factory automation inspection systems. IC Role / Device Role / Timing Role: Fast-enable current source with <1 µs DIM pin response supporting PWM dimming up to 20 kHz. Use Value: 75 µA internal DIM pullup eliminates external bias resistor; 300 ns min OFF-time ensures consistent LED off-state during strobe blanking. |
| Commercial Street Lighting | Architectural Accent Lighting |
|
Use Scenario: Outdoor LED luminaires operating continuously at ambient temperatures from –40°C to +85°C with long service life requirements. IC Role / Device Role / Timing Role: Primary LED driver in isolated AC/DC + DC/DC architecture delivering regulated 500 mA to multi-string parallel LED boards. Use Value: 200-mV CS reference tolerance and –40°C to +125°C junction rating ensure ±3% current stability over full environmental range. |
Use Scenario: Low-profile linear LED strips embedded in building façades where PCB space and thermal mass are constrained. IC Role / Device Role / Timing Role: Compact constant-current source driving 1–3 high-CRI LEDs per segment using capacitor-less output configuration. Use Value: VSSOP-8 package with thermal pad enables >1.5 W dissipation in 9 mm² area; supports ceramic-only output for ultra-thin mechanical profiles. |
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 |
|---|---|---|---|
| LM3404MMX/NOPB | Higher 1-A output current, 6–42 V input, same VSSOP-8 package but 1.2-Ω RDS(on). | Supports higher-power single-string LEDs (e.g., 1-W emitters); requires larger inductor and sense resistor for same current. | Select when >500 mA LED current is needed and thermal margin allows higher RDS(on) loss. |
| TPS92630QPWPRQ1 | Automotive-grade AEC-Q100 qualified, 3-A channel current, integrated PWM generator, 4.5–40 V input. | Designed for multi-channel RGB or tunable-white systems with diagnostics; requires external current mirrors for >1 channel. | Choose for ASIL-B compliant designs requiring fault reporting, channel enable/disable, or color mixing control. |
Compared with LM3402MMX/NOPB, LM3404MMX/NOPB offers higher current capacity at the cost of reduced efficiency and thermal headroom, while TPS92630QPWPRQ1 adds automotive qualification and multi-channel flexibility but increases system complexity and BOM cost.
Availability
LM3402MMX/NOPB is available at Aetrix Electronics and suitable for automotive lighting, industrial machine vision, and commercial street lighting requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LM3402MMX/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and consumer markets.
The LM3402MMX/NOPB belongs to TI's LED driver product line, engineered for high-reliability constant-current regulation in harsh environments-emphasizing thermal robustness, open-fault protection, and simplified system-level design.
FAQ
What is the maximum LED string voltage supported by LM3402MMX/NOPB?
The LM3402MMX/NOPB does not regulate output voltage directly-it regulates current. Maximum output voltage is limited by the 300 ns minimum OFF-time and input voltage: VO(MAX) ≈ VIN × tON/(tON + 300 ns). At VIN = 42 V and typical tON = 650 ns, VO(MAX) ≈ 36 V. This supports up to 10 white LEDs (VF ≈ 3.6 V each) in series. Exceeding this risks open-LED latch-up.
Can LM3402MMX/NOPB operate without an output capacitor?
Yes, LM3402MMX/NOPB is explicitly designed for capacitor-less LED operation. Its current-mode control and 200-mV CS reference stabilize regulation using only the inductor and sense resistor. A small 10-nF capacitor across the LED string suppresses ringing but is not required for regulation. This reduces cost, size, and failure modes associated with electrolytic capacitors.
How does the DIM pin function for PWM dimming on LM3402MMX/NOPB?
The DIM pin on LM3402MMX/NOPB accepts TTL-level PWM signals: logic low (<0.8 V) disables the internal MOSFET and halts LED current; logic high (>2.2 V) enables regulation. With 75 µA internal pullup, the device defaults to ON when DIM is unconnected. Dimming frequency should be ≤1/10th of switching frequency to avoid aliasing-e.g., ≤20 kHz for 200 kHz operation.
What thermal performance can be expected from LM3402MMX/NOPB in VSSOP-8 package?
In the DGK (VSSOP-8) package, LM3402MMX/NOPB has RθJA = 154.4°C/W (no PCB copper) and RθJB = 74.2°C/W (with 1-in² 2-oz copper). With proper thermal vias under the DAP pad, junction-to-board resistance drops to ~25°C/W. At 500 mA output and 24 V input, typical power dissipation is ~0.5 W-enabling reliable operation up to +85°C ambient with minimal heatsinking.
Is LM3402MMX/NOPB pin-compatible with LM3402HV variants?
No, LM3402MMX/NOPB is not pin-compatible with LM3402HV variants. While both share identical pinout and package, LM3402HV is rated for 6–75 V input and uses different internal voltage references and protection thresholds. Substituting LM3402HV into a 42 V-design may cause premature UVLO or inaccurate current regulation; always verify input range and electrical characteristics before interchange.
LM3402MMX/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):
- 42V
- Voltage - Output:
- 40V
- 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
LM3402MMX/NOPB FAQ
1.How can I place an order for LM3402MMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3402MMX/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 LM3402MMX/NOPB reliable?
The price and inventory of LM3402MMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3402MMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3402MMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3402MMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3402MMX/NOPB?
LM3402MMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3402MMX/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 LM3402MMX/NOPB?
For technical support, including LM3402MMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3402MMX/NOPB requirements.
6.How does Aetrix verify that LM3402MMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3402MMX/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 LM3402MMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3402MMX/NOPB?
All LM3402MMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3402MMX/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 LM3402MMX/NOPB part is unused and in its original packaging.
Return procedure for LM3402MMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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