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Texas Instruments LM3402MRX/NOPB
- Part No.:
- LM3402MRX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3402MRX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:4,755
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Product details
Overview
LM3402MRX/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 threshold, 6–42 V input range, and hysteretic controlled-on-time (COT) architecture for driving high-power LED arrays in automotive and industrial lighting. It delivers precise current regulation without loop compensation.
For engineers reviewing the LM3402MRX/NOPB datasheet, LM3402MRX/NOPB pinout, LM3402MRX/NOPB application, or LM3402MRX/NOPB equivalent, key selection criteria include its 300 ns minimum OFF-time, 735 mA peak current limit, PWM dimming capability via TTL-compatible DIM pin, thermal shutdown at 165°C, and support for ceramic-output or capacitor-less LED configurations.
Technical Context
The LM3402MRX/NOPB implements a controlled ON-time (COT) architecture combining hysteretic mode control with a one-shot timer whose duration varies inversely with VIN and is set by an external RON resistor. This eliminates need for external 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 comparator protection: CS pin regulates at 200 mV (valley current) and disables SW if VSNS exceeds 300 mV (overcurrent/open-LED protection).
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 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-value sense resistors. |
| Peak Current Limit | 735 mA (typ) - provides robust short-circuit and startup protection; triggers hiccup-mode recovery under sustained overload. |
| Switch RDS(on) | 0.7 Ω (typ) at VBOOT–VSW = 6.3 V - minimizes conduction loss and thermal rise in high-current LED strings. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects die during sustained overload or poor PCB thermal design; auto-restarts after cooldown. |
| Minimum OFF-time | 300 ns - constrains maximum duty cycle and defines VO(MAX) = VIN × tON/(tON + 300 ns); enables near-input-voltage output regulation. |
Pinout & Package
LM3402MRX/NOPB is housed in an 8-pin VSSOP (DGK) package with 3.00 mm × 3.00 mm body size and exposed thermal pad (DAP) connected to GND for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node output | Connects to inductor and Schottky diode anode; carries full switched current; requires low-inductance 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); enables fast LED on/off control without disabling bias circuitry. |
| GND | Power and signal ground | Reference for all analog circuits; must be low-impedance connection to system ground plane. |
| CS | Current sense feedback | Monitors voltage across RSNS; compares to 200 mV reference to regulate LED current; sensitive to noise-requires local filtering. |
| RON | ON-time control | Resistor from RON to VIN sets tON; determines switching frequency and max output voltage capability. |
| VCC | Internal LDO output | 7-V regulated supply for gate driver and control logic; bypass with 0.1-µF X5R/X7R ceramic capacitor to GND. |
| VIN | Main power input | Supplies both power stage and internal LDO; accepts 6–42 V; VCC tracks VIN until 8.8 V, then regulates at 7 V. |
Key Features
| Feature | Design Value |
|---|---|
| No compensation required | Hysteretic COT control eliminates external compensation network-reduces BOM count and layout sensitivity. |
| Capacitor-less operation | Supports LED strings without output capacitor due to inherent current-regulation stability and inductor-based ripple control. |
| Built-in open-LED protection | CS comparator disables SW when VSNS drops below 200 mV (open circuit) or rises above 300 mV (overcurrent), preventing overvoltage stress. |
| Integrated 7-V LDO | Generates stable VCC from VIN; enables self-biasing and eliminates need for external bias supply or charge pump. |
| PWM dimming with fast enable | DIM pin retains active bias during low state-ensures <1 µs turn-on delay and eliminates external pull-up requirement (75 µA internal pullup). |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving 3–5 series-connected white LEDs (VF ≈ 3.2–3.6 V each) from 12 V or 24 V vehicle battery with load dump tolerance up to 42 V. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED string current at 350–500 mA; uses RON to set ~500 kHz switching for EMI compliance and compact magnetics. Use Value: Eliminates need for external current-sense amplifier or compensation components; withstands cold-crank (6 V) and load-dump (42 V) transients per ISO 7637-2. |
Use Scenario: Powering multi-string LED arrays (e.g., 12–24 LEDs in series-parallel) in warehouse fixtures operating from 24–48 V DC distribution rails. IC Role / Device Role / Timing Role: Primary current regulator with thermal foldback; uses DAP-to-ground vias for >150°C junction survival in enclosed housings. Use Value: Enables single-chip solution for >20 W LED loads; supports programmable dimming via 0–100% PWM on DIM pin without microcontroller intervention. |
| Commercial Streetlight Module | UV-C Disinfection System |
|
Use Scenario: Outdoor LED streetlight using 10–15 series LEDs powered from 36–48 V PoE++ or DC microgrid with wide ambient temperature range (–40°C to +85°C). IC Role / Device Role / Timing Role: Robust current source with thermal shutdown (165°C) and open-LED detection; operates in CCM across full input range for consistent efficiency. Use Value: Delivers ±3% LED current accuracy over temperature and line; supports capacitor-less output to reduce failure points in humid environments. |
Use Scenario: Driving high-forward-voltage UV-C LEDs (VF ≈ 6.8–7.5 V) in pulsed disinfection arrays requiring precise 500 mA current pulses with rapid on/off transitions. IC Role / Device Role / Timing Role: Fast-response current controller with <1 µs DIM-enabled turn-on; uses 300 ns minimum OFF-time to sustain high-duty-cycle pulses. Use Value: Enables deterministic UV dose delivery via PWM dimming; integrated current limit prevents LED overcurrent during pulse edge transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3402HVMM/NOPB | Wider 6–75 V VIN range; identical pinout and functionality; higher BOOT–GND rating (90 V vs 59 V). | Suitable for 48 V telecom or 72 V battery systems where input may exceed 42 V. | Select LM3402HVMM/NOPB only if input voltage exceeds 42 V; otherwise LM3402MRX/NOPB offers optimal cost/performance for ≤42 V systems. |
| MPQ4425AGU-AEC1-P | 40 V max VIN; 1.2 A output; synchronous rectification; AEC-Q100 Grade 1 qualified; different pinout and control scheme (current-mode PWM). | Targets automotive front-lighting with higher current and functional safety requirements. | Choose MPQ4425AGU-AEC1-P only for AEC-Q100-compliant designs requiring >500 mA or synchronous efficiency; not drop-in compatible. |
Compared with LM3402HVMM/NOPB, LM3402MRX/NOPB trades input voltage headroom for lower cost and smaller thermal footprint in 12/24 V systems; versus MPQ4425AGU-AEC1-P, it offers simpler design, no compensation, and proven reliability in non-automotive industrial lighting-without AEC-Q100 overhead.
Availability
LM3402MRX/NOPB is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay fixtures, commercial streetlights, and UV-C disinfection systems requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LM3402MRX/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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets since 1930.
The LM3402MRX/NOPB belongs to TI's LED driver product line, engineered specifically for cost-sensitive, thermally constrained constant-current applications in automotive lighting, industrial illumination, and architectural LED systems.
FAQ
What is the maximum input voltage supported by the LM3402MRX/NOPB?
The LM3402MRX/NOPB supports a maximum input voltage of 42 V, as specified in its absolute maximum ratings and recommended operating conditions. This makes it suitable for 12 V and 24 V automotive and industrial systems with transient tolerance up to 42 V. Exceeding this voltage risks permanent damage to the internal MOSFET and gate driver circuitry.
How does the LM3402MRX/NOPB achieve constant current regulation without external compensation?
The LM3402MRX/NOPB uses a controlled ON-time (COT) hysteretic architecture that compares the CS pin voltage against a precise 200 mV internal reference. When current falls below the threshold, the switch turns on for a fixed duration determined by VIN and RON-eliminating the need for error amplifiers, compensation networks, or loop stability analysis.
Can the LM3402MRX/NOPB drive LED strings without an output capacitor?
Yes, the LM3402MRX/NOPB is explicitly designed for capacitor-less operation. Its current-regulation topology relies on inductor current continuity and valley-current sensing at the CS pin, removing dependency on output capacitance for stability-ideal for reliability-critical or space-constrained LED modules.
What protection features are built into the LM3402MRX/NOPB?
The LM3402MRX/NOPB integrates cycle-by-cycle current limiting (735 mA typ), thermal shutdown (165°C with 25°C hysteresis), input undervoltage lockout (VCC UVLO at 5.25 V), BOOT undervoltage lockout (1.7–4 V), and dual CS comparator protection (200 mV regulation + 300 mV overcurrent cutoff) for open-LED and overcurrent fault handling.
Is the LM3402MRX/NOPB pin-compatible with the LM3402HV variant?
No-while LM3402MRX/NOPB (DGK/VSSOP) and LM3402HVMM/NOPB (DDA/HSOP) share identical pin functions and electrical behavior, they use different packages: 3.00 mm × 3.00 mm VSSOP vs 4.89 mm × 3.90 mm HSOP. PCB layout and thermal design must be adapted accordingly; no direct physical replacement is possible without board revision.
LM3402MRX/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):
- 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-SO PowerPad
LM3402MRX/NOPB FAQ
1.How can I place an order for LM3402MRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3402MRX/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 LM3402MRX/NOPB reliable?
The price and inventory of LM3402MRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3402MRX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3402MRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3402MRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3402MRX/NOPB?
LM3402MRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3402MRX/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 LM3402MRX/NOPB?
For technical support, including LM3402MRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3402MRX/NOPB requirements.
6.How does Aetrix verify that LM3402MRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3402MRX/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 LM3402MRX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3402MRX/NOPB?
All LM3402MRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3402MRX/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 LM3402MRX/NOPB part is unused and in its original packaging.
Return procedure for LM3402MRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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