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Texas Instruments LM3402MRX/J7002927
- Part No.:
- LM3402MRX/J7002927
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3402MRX/J7002927.pdf
- Description:
- PROTOTYPE
- Quantity:
- Payment:
- Shipping:
Inventory:3,704
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Product details
Overview
LM3402MRX/J7002927 from Texas Instruments is a monolithic 0.5-A constant-current buck regulator with integrated 0.7–1.5 Ω N-channel MOSFET, 6–42 V input range, 200 mV current-sense threshold, and hysteretic controlled-on-time (COT) architecture for driving high-power LED arrays in automotive headlamps and industrial lighting systems.
For engineers reviewing the LM3402MRX/J7002927 datasheet, LM3402MRX/J7002927 pinout, LM3402MRX/J7002927 application, or LM3402MRX/J7002927 equivalent, key selection considerations include VIN operating range, CS pin reference accuracy (±6 mV), thermal shutdown threshold (165°C), PWM dimming compatibility, and VSSOP-8 package thermal performance (RθJA = 154.4°C/W).
Technical Context
The LM3402MRX/J7002927 implements a controlled-on-time (COT) architecture combining hysteretic current regulation with a voltage-dependent one-shot timer, eliminating loop compensation. Its CS pin compares sensed voltage against a 200 mV bandgap reference to trigger switch turn-on, while RON sets tON inversely proportional to VIN.
It integrates a 7-V internal LDO (VCC pin), bootstrap gate driver (BOOT–SW), cycle-by-cycle current limiting (735 mA typical), and fast PWM dimming via TTL-compatible DIM pin with 75 µA internal pullup - enabling seamless low-frequency dimming without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 42 V - supports 12 V/24 V automotive battery rails with ±2 V dropout margin at startup. |
| Output Current | 500 mA over temperature - delivers stable LED drive current across –40°C to +125°C junction range. |
| CS Threshold | 200 mV ±6 mV - sets LED current via RSNS = 0.2 V / IF; enables <1% current accuracy with 1% resistor. |
| Switch RDS(on) | 0.7–1.5 Ω - limits conduction loss to ≤375 mW at 500 mA, supporting thermally constrained PCB layouts. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects device during sustained overload or poor heatsinking without latch-off. |
| Shutdown Current | 90–180 µA - enables ultra-low-power standby in always-on vehicle modules. |
| Min OFF-time | 300 ns - constrains maximum duty cycle and defines VO(MAX) = VIN × tON/(tON + 300 ns). |
Pinout & Package
LM3402MRX/J7002927 is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm with exposed thermal pad (DAP) requiring 4–6 vias to ground plane for optimal thermal performance (RθJB = 74.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch node | Connects to inductor and Schottky diode cathode; carries full switching current and high dv/dt. |
| 2 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 10-nF ceramic capacitor between BOOT and SW. |
| 3 VIN | Main power input | Accepts 6–42 V; powers internal circuits and charges BOOT capacitor via internal diode. |
| 4 GND | Power ground | Analog and power return; must be low-impedance connection to minimize noise on CS and DIM. |
| 5 CS | Current sense input | Compares VSNS against 200 mV reference; sets LED current via RSNS to ground. |
| 6 RON | ON-time control | Resistor from RON to VIN programs tON; determines switching frequency and max output voltage. |
| 7 DIM | PWM dimming input | TTL-compatible enable/disable; logic low (<0.8 V) shuts off LED current; internal 75 µA pullup ensures default ON. |
| 8 VCC | Bias regulator output | 7-V internal LDO output; bypass with ≥0.1 µF X5R/X7R ceramic capacitor close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| No control loop compensation required | Hysteretic COT architecture eliminates external compensation network, reducing BOM count and layout sensitivity. |
| Integrated 0.5-A N-channel MOSFET | Eliminates external switch and associated gate drive complexity; reduces solution footprint by >30% vs discrete designs. |
| Separate PWM dimming and shutdown | DIM pin enables flicker-free dimming down to 100 Hz; RON grounding provides independent low-power shutdown (90 µA). |
| Supports ceramic-output capacitors and capacitor-less outputs | Enables cost-optimized designs: no output cap for minimal size, or ceramic CO for ripple reduction without electrolytic aging. |
| Built-in open-LED protection | OVP comparator disables switch if CS exceeds 300 mV - prevents runaway voltage during LED string breakage. |
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 cold-crank tolerance. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED current to 350–500 mA using CS feedback and programmable tON. Use Value: Maintains consistent lumen output across wide input (6–42 V) and temperature (–40°C to +125°C) ranges without trimming. |
Use Scenario: Powering multi-string LED arrays in warehouse high-bay fixtures with 277 VAC rectified input (≈380 VDC bus). IC Role / Device Role / Timing Role: Primary current regulator in isolated flyback + buck post-regulator topology, delivering precise 500 mA per channel. Use Value: Enables scalable multi-channel design with shared RON programming and synchronized DIM control for uniform dimming. |
| Emergency Exit Sign Illumination | UV-C Sterilization Module |
|
Use Scenario: Battery-backed LED driver for UL 924-compliant exit signs requiring >90-minute runtime at full brightness. IC Role / Device Role / Timing Role: Low-quiescent-current (90 µA shutdown) buck regulator maintaining 200 mA LED current from 3.6 V Li-ion pack. Use Value: Extends battery life via ultra-low ISD and eliminates need for external enable FET or level shifter. |
Use Scenario: Driving high-voltage UV-C LEDs (VF ≈ 6.8–7.2 V) in portable sterilization wands powered from USB PD (20 V). IC Role / Device Role / Timing Role: Constant-current source with 200 mV CS threshold and 735 mA peak limit ensuring safe LED stress under transient conditions. Use Value: Prevents LED overcurrent during hot-plug events via cycle-by-cycle limiting and hiccup-mode recovery. |
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 |
|---|---|---|---|
| LM3402HVMM/NOPB | Wider 6–75 V VIN range; identical pinout and CS threshold but higher BOOT/BOOT-SW ratings (90 V vs 59 V). | Suitable for 48 V telecom or 380 V DC-link applications where LM3402MRX/J7002927's 42 V max is insufficient. | Select LM3402HVMM/NOPB only when input exceeds 42 V; otherwise LM3402MRX/J7002927 offers better thermal performance in VSSOP. |
| MPQ4425HGJ-P | 40 V max VIN; 1.2 A output; requires external compensation; different pinout (10-pin QFN); no integrated BOOT cap drive. | Higher current capability but increased design complexity; lacks internal pullup on EN/DIM and open-LED protection. | Choose MPQ4425HGJ-P only when >500 mA output or tighter EMI control (fixed-frequency) is mandatory; LM3402MRX/J7002927 simplifies layout and reduces component count. |
Compared with LM3402HVMM/NOPB, LM3402MRX/J7002927 trades input voltage headroom for lower thermal resistance in VSSOP packaging; versus MPQ4425HGJ-P, it delivers proven simplicity for 500 mA LED loads without compensation or external gate drive components.
Availability
LM3402MRX/J7002927 is available at Aetrix Electronics and suitable for automotive lighting, industrial high-bay fixtures, and emergency signage requiring stable component supply with long-term production continuity.
Supply support for LM3402MRX/J7002927 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, embedded processing, and power management ICs, with leadership in automotive, industrial, and LED lighting solutions.
The LM3402 product line was designed specifically as a compact, thermally efficient constant-current buck regulator for high-reliability LED illumination in space-constrained and thermally demanding environments.
FAQ
What is the maximum input voltage rating for LM3402MRX/J7002927?
The absolute maximum VIN rating for LM3402MRX/J7002927 is 45 V, with recommended operation up to 42 V. Exceeding 42 V risks violating the recommended operating conditions and may trigger thermal shutdown or reduce long-term reliability. The device is not rated for 75 V input - that specification applies only to the LM3402HV variant, not LM3402MRX/J7002927.
How does the RON pin set switching frequency in LM3402MRX/J7002927?
The RON pin sets the controlled ON-time (tON) via an external resistor to VIN, following tON ≈ 1.34×10⁻¹⁰ × RON / VIN. For example, with RON = 200 kΩ and VIN = 24 V, tON ≈ 650 ns, yielding ~500 kHz switching frequency in continuous conduction mode. LM3402MRX/J7002927 uses this voltage-dependent timing to maintain near-constant fSW across input variations.
Can LM3402MRX/J7002927 operate without an output capacitor?
Yes, LM3402MRX/J7002927 supports capacitor-less operation due to its current-regulated buck topology. The inductor directly controls LED current ripple; no output capacitor is needed for basic functionality. A small 10-nF capacitor across the LED array is recommended to dampen voltage oscillation during open-circuit transients, but bulk CO is optional and used only to reduce current ripple.
What protection features are built into LM3402MRX/J7002927?
LM3402MRX/J7002927 includes cycle-by-cycle current limiting (735 mA typical), thermal shutdown (165°C), open-LED protection via CS overvoltage comparator (300 mV threshold), and VCC undervoltage lockout (5.25 V). It also features BOOT undervoltage lockout and ESD protection (±2000 V HBM), all implemented internally without external components.
Is LM3402MRX/J7002927 pin-compatible with LM3402HV variants?
No, LM3402MRX/J7002927 is not pin-compatible with LM3402HV variants despite identical pin numbering and function definitions. The HV versions use HSOP-8 (DDA) packaging with larger 4.89 mm × 3.90 mm body and different thermal pad layout, whereas LM3402MRX/J7002927 uses VSSOP-8 (DGK) with 3.00 mm × 3.00 mm footprint and distinct thermal via requirements.
LM3402MRX/J7002927 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 0.2V ~ 40V
- Current - Output / Channel:
- 500mA
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM3402MRX/J7002927 FAQ
1.How can I place an order for LM3402MRX/J7002927 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3402MRX/J7002927 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/J7002927 reliable?
The price and inventory of LM3402MRX/J7002927 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3402MRX/J7002927 is usually 5 days.
3.What payment methods are accepted for LM3402MRX/J7002927?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3402MRX/J7002927 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3402MRX/J7002927?
LM3402MRX/J7002927 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3402MRX/J7002927 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/J7002927?
For technical support, including LM3402MRX/J7002927 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3402MRX/J7002927 requirements.
6.How does Aetrix verify that LM3402MRX/J7002927 is sourced from the original manufacturer or authorized distributors?
All LM3402MRX/J7002927 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/J7002927 meets industry standards.
7.What is the process for return or replacement of LM3402MRX/J7002927?
All LM3402MRX/J7002927 units undergo pre-shipment inspection (PSI). If there is an issue with LM3402MRX/J7002927, 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/J7002927 part is unused and in its original packaging.
Return procedure for LM3402MRX/J7002927:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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