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Texas Instruments LM3424MHX/NOPB
- Part No.:
- LM3424MHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3424MHX/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,176
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Product details
Overview
LM3424MHX/NOPB from Texas Instruments is a high-voltage N-channel MOSFET LED controller supporting buck, boost, buck-boost, and SEPIC topologies with 4.5 V to 75 V input range, programmable thermal foldback, and 2-Ω/1-A peak gate driver. It regulates constant LED current via high-side differential sensing and enables precision thermal management in outdoor SSL and industrial lighting systems.
For engineers reviewing the LM3424MHX/NOPB datasheet, LM3424MHX/NOPB pinout, LM3424MHX/NOPB application, or LM3424MHX/NOPB equivalent, key selection criteria include its 20-pin HTSSOP package, 2.45 V internal reference, adjustable switching frequency up to 2.0 MHz, cycle-by-cycle current limiting, and dual dimming (PWM + analog) support for high-reliability LED driver designs.
Technical Context
The LM3424MHX/NOPB implements peak current-mode control with inherent input voltage feed-forward compensation, enabling stable regulation across wide VIN and VOUT variations. Its high-side transconductance amplifier (20 mA/V gain, ±5 mV offset) interfaces with external sense resistors to set ILED with <±1% typical accuracy at 25°C.
Thermal foldback is implemented via dedicated TSENSE/TREF/TGAIN pins, allowing programmable breakpoint and slope using resistor dividers and thermistors. The controller integrates a 6.9 V LDO regulator (VCC), 2.45 V VS reference, and independent DDRV output for external PWM dimming MOSFETs - all operating across –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 75 V - supports wide-input industrial and automotive LED drivers without pre-regulation. |
| Switching Frequency | Up to 2.0 MHz - programmable via RT resistor; enables compact magnetics and high-frequency PWM dimming. |
| GATE Driver | 2 Ω sourcing / 4.5 Ω sinking - drives N-channel MOSFETs directly with 1-A peak current for fast turn-on/turn-off. |
| Current Sense Threshold | 245 mV typical at IS pin - sets cycle-by-cycle current limit; enables RDS(on)-based or shunt-based sensing. |
| Thermal Foldback Reference | 2.45 V VS output - precision reference for temperature-sensing circuitry with ±0.5% tolerance over temperature. |
| Dimming Support | PWM and analog - nDIM accepts 0–5 V analog signal; DDRV provides dedicated gate drive for external dimming FET. |
| Operating Temperature | –40°C to +125°C ambient - qualified for outdoor area lighting and high-temperature industrial enclosures. |
Pinout & Package
LM3424MHX/NOPB is housed in a thermally enhanced 20-pin HTSSOP (PWP) package measuring 6.50 mm × 4.40 mm with exposed PowerPAD™ for improved thermal dissipation (RθJC(bot) = 1.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Bypassed with 100 nF capacitor; powers internal startup regulator and gate driver circuits. |
| EN | Enable control | Active-high logic input; >2.4 V enables operation; <0.8 V places device in low-power shutdown (ISD ≤ 1 µA). |
| COMP | Error amplifier output | Connects to RC network for loop compensation; sets bandwidth and phase margin of current regulation loop. |
| CSH | Current sense reference | Regulated to 1.24 V; sums high-side sense current and thermal foldback current for LED current control. |
| RT/SYNC | Oscillator timing/sync input | Resistor-to-GND sets fSW (164–669 kHz); accepts external clock for synchronization in multi-phase systems. |
| nDIM | Dimming/UVLO input | Accepts PWM signal or resistor divider for analog dimming; also programs input undervoltage lockout threshold. |
| SS | Soft-start control | Capacitor-to-GND extends startup time to prevent inrush current and overshoot during power-up. |
| TGAIN | Foldback slope programming | Resistor-to-GND sets thermal foldback current slope (ITF vs. temperature) for precise LED derating. |
| TSENSE | Temperature sense input | Connects to thermistor/resistor divider; detects LED junction temperature for foldback activation. |
| TREF | Foldback reference | Reference node for thermal foldback circuit; used with TSENSE and TGAIN to define foldback breakpoint. |
| VS | Internal reference output | 2.45 V precision voltage source for external circuitry and thermal foldback calibration. |
| OVP | Overvoltage protection | Resistor divider from output sets OVP threshold (1.24 V internal comparator); latches off on fault. |
| DDRV | Dimming driver output | Drives gate of external N-MOSFET for high-speed PWM dimming; 13.5 Ω typical sink resistance. |
| GND | Power and signal ground | Must be connected to exposed PowerPAD™ for optimal thermal and electrical performance. |
| GATE | Main MOSFET gate driver | 2 Ω source / 4.5 Ω sink; delivers 1-A peak current for fast switching of high-side or low-side N-FETs. |
| VCC | Internal regulator output | 6.9 V regulated supply; bypassed with 2.2–3.3 µF ceramic capacitor for gate driver stability. |
| IS | Main switch current sense | Inputs current-limit signal from MOSFET RDS(on) or external shunt; triggers cycle-by-cycle shutdown at 245 mV. |
| SLOPE | Slope compensation input | Resistor-to-GND adds artificial ramp to COMP signal to stabilize current-mode control above 50% duty cycle. |
| HSN / HSP | High-side LED current sense | Differential inputs to transconductance amplifier; enable accurate, noise-immune current sensing in floating LED strings. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable thermal foldback | Breakpoint and slope independently set via TSENSE/TREF/TGAIN resistors - prevents LED thermal runaway in enclosed fixtures. |
| High-side differential current sensing | HSP/HSN inputs reject common-mode noise and enable accurate current regulation in high-voltage LED strings (>60 V). |
| Integrated 2.45 V precision reference (VS) | Stable, low-drift reference for external temperature sensing and foldback calibration - eliminates need for external VREF IC. |
| Dual dimming interface | nDIM accepts analog voltage or PWM; DDRV provides dedicated gate drive - supports both smooth analog dimming and flicker-free PWM. |
| Wide-input 75 V capable controller | No external HV bias required - simplifies design for 48 V telecom, 60 V industrial, and AC-line-derived LED drivers. |
Applications
| Street Lighting | Industrial High-Bay Fixtures |
|---|---|
|
Use Scenario: Outdoor LED street luminaires powered from 120/277 VAC via PFC front-end, requiring robust thermal management under full-load summer conditions. IC Role / Device Role: Constant-current controller implementing boost topology with thermal foldback to maintain LED lifetime at elevated ambient temperatures. Use Value: Programmable foldback breakpoint (e.g., 85°C) and slope ensure predictable LED current reduction before thermal stress degrades phosphor or bond wires. |
Use Scenario: High-bay warehouse lighting operating continuously at 50–60°C ambient, with strict EMI requirements and need for high efficiency at partial load. IC Role / Device Role: Buck-boost LED controller with synchronized switching frequency to avoid interference with PLC communication bands. Use Value: RT/SYNC pin enables external clock synchronization across multiple drivers, reducing conducted EMI peaks by >15 dB. |
| Architectural Facade Lighting | UV-C Disinfection Systems |
|
Use Scenario: Color-tunable RGBW LED arrays mounted on building exteriors, requiring precise current matching and analog dimming for smooth color transitions. IC Role / Device Role: High-side current controller with CSH-based analog dimming interface for per-channel current scaling without PWM artifacts. Use Value: 1.24 V CSH reference and low-offset high-side amplifier enable <±2% current matching across channels at 10–100% dimming range. |
Use Scenario: Pulsed UV-C LED arrays for surface disinfection, demanding rapid on/off cycling, overvoltage protection, and thermal derating during burst operation. IC Role / Device Role: Boost controller with OVP latch and DDRV-driven external MOSFET for microsecond-scale PWM gating of UV LEDs. Use Value: OVP pin protects against open-circuit faults during LED string failure; DDRV's 360 ns propagation delay ensures tight pulse-width control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3410XMY/NOPB | Fixed 1.6 MHz fSW; no thermal foldback; integrated 0.5-A gate driver; 4.5–24 V VIN range. | Limited to low-voltage LED strings (<36 V); unsuitable for 75 V input or high-temperature thermal management. | Select when board space is constrained and thermal foldback is not required in indoor applications. |
| LT3761EFE#PBF | 4.5–100 V VIN; integrated 1.5-A gate driver; no dedicated thermal foldback pins; uses internal temp sensor. | Relies on die temperature only - cannot track remote LED junction temperature; less precise for fixture-level thermal control. | Choose for higher integration and wider VIN, but accept reduced thermal foldback flexibility versus LM3424MHX/NOPB. |
Compared with LM3424MHX/NOPB, LM3410XMY/NOPB offers smaller footprint but lacks thermal foldback and high-voltage capability, while LT3761EFE#PBF provides broader VIN and higher drive strength but sacrifices programmable remote temperature sensing - making LM3424MHX/NOPB uniquely suited for outdoor SSL requiring precise, externally referenced thermal derating.
Availability
LM3424MHX/NOPB is available at Aetrix Electronics and suitable for street lighting, industrial high-bay fixtures, and UV-C disinfection systems requiring stable component supply and long-term manufacturability.
Supply support for LM3424MHX/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 leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in high-reliability power conversion ICs.
The LM3424MHX/NOPB belongs to TI's LED lighting controller product line, designed specifically for high-voltage, thermally adaptive constant-current drivers in outdoor and industrial solid-state lighting applications.
FAQ
What topologies does the LM3424MHX/NOPB support?
The LM3424MHX/NOPB supports buck, boost, buck-boost, and SEPIC LED driver topologies. Its N-channel MOSFET gate driver and high-side current sense architecture allow flexible implementation - including ground-referenced switches in boost configurations and floating loads in buck-boost. The LM3424MHX/NOPB does not require external level-shifting circuitry for high-side sensing, simplifying layout in all supported configurations.
How is thermal foldback configured on the LM3424MHX/NOPB?
Thermal foldback on the LM3424MHX/NOPB is configured using three dedicated pins: TSENSE (connects to thermistor/resistor divider), TREF (reference node), and TGAIN (sets foldback slope). A resistor from TGAIN to GND defines the ITF current slope, while the TSENSE–TREF voltage divider sets the foldback breakpoint temperature. The LM3424MHX/NOPB sums ITF into the CSH node to reduce regulated LED current linearly above the breakpoint - enabling precise, user-defined thermal derating profiles.
Does the LM3424MHX/NOPB integrate a voltage reference?
Yes, the LM3424MHX/NOPB integrates a precision 2.45 V voltage reference on the VS pin, specified with ±0.5% tolerance over temperature. This reference powers the internal thermal foldback circuitry and can also supply external circuitry such as thermistor bias networks or auxiliary comparators. The LM3424MHX/NOPB does not require an external reference IC for foldback calibration, reducing BOM count and improving system accuracy.
What is the maximum switching frequency of the LM3424MHX/NOPB?
The LM3424MHX/NOPB supports a programmable switching frequency up to 2.0 MHz, set by a resistor connected from the RT/SYNC pin to GND. At RT = 12 kΩ, typical fSW is 597 kHz; at RT = 36 kΩ, it drops to 207 kHz. The LM3424MHX/NOPB also accepts external clock signals on RT/SYNC for synchronization in multi-driver systems - critical for EMI compliance in commercial lighting installations.
Can the LM3424MHX/NOPB perform both PWM and analog dimming?
Yes, the LM3424MHX/NOPB supports simultaneous PWM and analog dimming. The nDIM pin accepts either a PWM signal (for digital dimming) or an analog voltage (0–5 V) for amplitude-based current scaling. Additionally, the DDRV pin provides a dedicated gate driver output to control an external MOSFET for high-speed PWM dimming of the entire LED string - enabling flicker-free dimming down to 0.1% with no color shift.
LM3424MHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 75V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 2MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM3424MHX/NOPB FAQ
1.How can I place an order for LM3424MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3424MHX/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 LM3424MHX/NOPB reliable?
The price and inventory of LM3424MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3424MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3424MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3424MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3424MHX/NOPB?
LM3424MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3424MHX/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 LM3424MHX/NOPB?
For technical support, including LM3424MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3424MHX/NOPB requirements.
6.How does Aetrix verify that LM3424MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3424MHX/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 LM3424MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3424MHX/NOPB?
All LM3424MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3424MHX/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 LM3424MHX/NOPB part is unused and in its original packaging.
Return procedure for LM3424MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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