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Texas Instruments LM3424MH/NOPB
- Part No.:
- LM3424MH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3424MH/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,846
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Product details
Overview
LM3424MH/NOPB from Texas Instruments is a high-voltage N-channel MOSFET controller for constant-current LED drivers, supporting buck, boost, buck-boost, and SEPIC topologies. It features 4.5 V to 75 V input range, programmable thermal foldback, 2-Ω/1-A peak gate driver, and high-side differential current sensing with 1.24 V reference. It enables precise LED current regulation in outdoor area lighting and industrial SSL systems.
For engineers reviewing the LM3424MH/NOPB datasheet, LM3424MH/NOPB pinout, LM3424MH/NOPB application, or LM3424MH/NOPB equivalent, key selection considerations include thermal foldback programmability, high-side current sense architecture, cycle-by-cycle current limiting, PWM/analog dimming support, and compatibility with external N-channel MOSFETs in wide-input LED driver designs.
Technical Context
The LM3424MH/NOPB implements peak current-mode control with inherent input voltage feed-forward compensation and programmable slope compensation to ensure stability at duty cycles >50%. Its high-side transconductance amplifier (20 mA/V, 500 kHz bandwidth) interfaces with external sense resistors via HSP/HSN pins and regulates LED current by forcing CSH to 1.24 V.
Thermal management is achieved through a dedicated foldback circuit using TSENSE, TREF, TGAIN, and VS (2.45 V reference), enabling user-defined breakpoint and slope via resistor networks. The controller integrates a 6.9 V internal LDO (VCC), EN threshold of 2.4 V (with 0.8 V shutdown), and dual gate drivers: GATE (2 Ω sourcing / 4.5 Ω sinking) and DDRV (13.5 Ω sourcing / 3.5 Ω sinking).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 75 V - supports wide-input industrial and outdoor LED drivers without pre-regulation. |
| Switching Frequency | Up to 2.0 MHz - set via RT resistor or synchronized externally; enables compact magnetics and high-frequency PWM dimming. |
| Current Sense Threshold | 1.24 V at CSH - enables accurate, low-loss high-side LED current regulation with external sense resistor. |
| GATE Driver Strength | 2 Ω sourcing / 4.5 Ω sinking - drives N-channel MOSFETs up to 1 A peak, minimizing switching losses in high-power LED stages. |
| Thermal Foldback Reference | VS = 2.45 V ±0.05 V - precision reference for programmable LED current derating vs. temperature. |
| EN Threshold | 2.4 V enable / 0.8 V shutdown - provides clean system-level on/off control with 0.1 V hysteresis. |
| OVP Threshold | 1.24 V at OVP pin - allows resistor-divider-based output overvoltage protection for LED string open-circuit safety. |
Pinout & Package
LM3424MH/NOPB is housed in a thermally enhanced HTSSOP-20 (PWP) package (6.50 mm × 4.40 mm) with exposed thermal pad (DAP) tied to GND for efficient heat dissipation in high-current LED driver PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Bypassed with 100 nF capacitor; powers internal regulator and withstands up to 75 V DC. |
| EN | Enable control input | Logic-level interface: >2.4 V enables operation; <0.8 V places device in low-power shutdown (ISD ≤ 1 µA). |
| COMP | Error amplifier output | Connects to compensation network (capacitor + RC) for loop stability in current regulation feedback path. |
| CSH | Current sense reference node | 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 | PWM dimming / UVLO input | Accepts PWM signal for high-speed dimming; also configures input under-voltage lockout via resistor divider. |
| SS | Soft-start control | Capacitor-to-GND extends startup time to limit inrush current and prevent output overshoot. |
| TGAIN | Foldback slope programming | Resistor-to-GND sets thermal foldback slope (dI/dT); adjusts LED current reduction rate above breakpoint. |
| TSENSE | Temperature sense input | Interfaces with thermistor/resistor divider to detect LED junction or heatsink temperature for foldback activation. |
| TREF | Foldback reference input | Configures thermal foldback breakpoint voltage via resistor divider from VS (2.45 V) to set TBK. |
| VS | Internal reference output | 2.45 V ±0.05 V precision reference for thermal foldback circuitry and external analog functions. |
| OVP | Output overvoltage detection | Resistor-divider from LED string output enables fast shutdown on open-circuit or overvoltage fault. |
| DDRV | Dimming MOSFET gate driver | Drives external N-MOSFET in series with LED string for high-frequency PWM dimming (≤2.0 MHz). |
| GND | Signal and power ground | Common return for all analog and digital circuits; must be connected to DAP for thermal performance. |
| GATE | Main switch gate driver | 2 Ω sourcing / 4.5 Ω sinking drive for external N-channel MOSFET; supports high-efficiency switching. |
| VCC | Internal LDO output | 6.9 V regulated supply (20–25 mA limit); bypassed with 2.2–3.3 µF ceramic capacitor to GND. |
| IS | Main switch current sense | Connects to MOSFET source (RDS(on) sensing) or external sense resistor for cycle-by-cycle current limiting. |
| SLOPE | Slope compensation input | Resistor-to-GND programs artificial ramp amplitude to stabilize peak current-mode control at high duty cycles. |
| HSN / HSP | High-side LED current sense inputs | Differential inputs to transconductance amplifier; enable floating LED string sensing with minimal common-mode error. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable thermal foldback | Breakpoint and slope independently set via TREF/TSENSE/TGAIN resistors - enables precise LED junction temperature management without external ICs. |
| High-side differential current sensing | HSP/HSN inputs with 10 µA bias current and ±5 mV offset - supports accurate LED current regulation in floating-string configurations (e.g., boost, SEPIC). |
| Integrated dual gate drivers | GATE (1-A peak, 2 Ω/4.5 Ω) + DDRV (1-A peak, 13.5 Ω/3.5 Ω) - eliminates need for external drivers in both main switching and PWM dimming paths. |
| Peak current-mode control with slope compensation | Programmable SLOPE input and 1-MHz transconductance amplifier bandwidth - ensures stable operation across full duty cycle range in all topologies. |
| Wide-input, high-voltage operation | 4.5 V to 75 V VIN range with integrated 6.9 V LDO - enables direct connection to 12–48 V DC bus or rectified AC lines without auxiliary supply. |
Applications
| Street Lighting | Industrial Machine Vision |
|---|---|
|
Use Scenario: Outdoor LED street luminaires operating from 24–48 V DC or rectified 120/230 VAC with ambient temperatures from –40°C to +85°C. IC Role / Device Role / Timing Role: Constant-current controller implementing boost topology with thermal foldback to protect LEDs during summer operation. Use Value: Maintains ±3% LED current accuracy across input voltage and temperature variations while reducing luminous flux only when junction temperature exceeds 85°C. |
Use Scenario: High-intensity strobed LED arrays in automated inspection systems requiring microsecond-level dimming response and stable current during rapid on/off cycling. IC Role / Device Role / Timing Role: PWM dimming controller with DDRV output driving external MOSFET, synchronized to camera trigger via RT/SYNC pin. Use Value: Achieves <360 ns dimming edge delay and supports 2.0 MHz PWM frequency for flicker-free, high-resolution imaging under pulsed illumination. |
| Architectural Accent Lighting | Commercial Signage |
|
Use Scenario: RGBW LED modules in building façade installations where color consistency depends on precise per-channel current matching and thermal derating. IC Role / Device Role / Timing Role: High-side current controller in buck-boost configuration, using separate LM3424MH/NOPB per channel with matched thermal foldback networks. Use Value: Enables identical thermal foldback profiles across R/G/B/W channels via shared TREF/TSENSE references, preserving white point stability at elevated ambient temperatures. |
Use Scenario: Large-format LED video walls powered from centralized 24 V DC distribution, requiring high efficiency (>92%) and reliable open-circuit protection. IC Role / Device Role / Timing Role: Constant-current controller in SEPIC topology accommodating variable LED string count; OVP pin monitors total string voltage. Use Value: Delivers >94% efficiency at 24 V input/36 V output and shuts down within 2 µs upon OVP detection, preventing catastrophic failure in multi-string arrays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3423MH/NOPB | Lacks thermal foldback circuitry; no TSENSE/TGAIN/TREF pins; fixed 1.24 V CSH reference only. | Suitable for cost-sensitive LED drivers where thermal management is handled externally or not required. | Select LM3423MH/NOPB only if thermal foldback is unnecessary and board space is constrained - it omits 4 pins and reduces BOM count. |
| LT3761EFE#PBF | Includes integrated high-side current sense amplifier and 75 V MOSFET driver; no DDRV pin; uses different foldback implementation (internal NTC bias). | Better suited for single-chip solutions where layout simplicity outweighs programmability; lacks independent dimming gate drive. | Choose LT3761EFE#PBF when minimizing external components is critical and DDRV-driven PWM dimming is not required. |
Compared with LM3423MH/NOPB and LT3761EFE#PBF, the LM3424MH/NOPB uniquely combines programmable thermal foldback, dual gate drivers (GATE + DDRV), and high-side differential sensing in a single 20-pin HTSSOP package - making it optimal for thermally demanding, high-dimming-fidelity LED driver designs requiring external MOSFET flexibility.
Availability
LM3424MH/NOPB is available at Aetrix Electronics and suitable for street lighting, industrial machine vision, architectural accent lighting, and commercial signage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM3424MH/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 decades of expertise in LED driver innovation and automotive-grade reliability.
The LM3424MH/NOPB belongs to TI's high-voltage LED controller product line, designed specifically for thermally robust, topology-flexible constant-current drivers in outdoor, industrial, and architectural solid-state lighting applications.
FAQ
What topologies does the LM3424MH/NOPB support?
The LM3424MH/NOPB supports buck, boost, buck-boost, and SEPIC LED driver topologies. Its high-side current sense architecture (HSP/HSN) and N-channel gate driver (GATE) enable flexible implementation across all four configurations. The LM3424MH/NOPB does not require external level-shifting circuitry for high-side switch control, simplifying design in boost and SEPIC applications where the LED string floats relative to ground.
How is thermal foldback programmed on the LM3424MH/NOPB?
Thermal foldback on the LM3424MH/NOPB is programmed using three external resistors: TREF sets the foldback breakpoint voltage (TBK) via a resistor divider from VS (2.45 V); TSENSE connects to a thermistor network to detect temperature; and TGAIN sets the foldback slope (dI/dT) via a resistor to GND. The LM3424MH/NOPB sums thermal foldback current (ITF) into the CSH node, reducing regulated LED current as temperature rises above TBK.
Does the LM3424MH/NOPB integrate a PWM dimming driver?
Yes, the LM3424MH/NOPB includes a dedicated dimming gate driver (DDRV) that outputs a high-speed logic-level signal to drive an external N-channel MOSFET in series with the LED string. The DDRV pin supports PWM frequencies up to 2.0 MHz with 360 ns propagation delay (nDIM falling to DDRV falling), enabling flicker-free dimming in machine vision and high-refresh-rate signage applications.
What is the function of the CSH pin on the LM3424MH/NOPB?
The CSH pin on the LM3424MH/NOPB serves as the summing node for the high-side current sense amplifier output and thermal foldback current (ITF). It is regulated to 1.24 V by the internal error amplifier, enabling precise LED current control via external resistors (RSNS, RHSP, RCSH). When HSP/HSN are grounded, the LM3424MH/NOPB disables the high-side amplifier and uses CSH as a low-side current sense input referenced to GND.
Can the LM3424MH/NOPB operate without an external MOSFET?
No, the LM3424MH/NOPB is a controller-only IC and requires an external N-channel MOSFET connected to the GATE pin. It does not integrate a power switch. The LM3424MH/NOPB drives the MOSFET gate with 2 Ω sourcing and 4.5 Ω sinking resistance, supporting peak currents up to 1 A - sufficient for MOSFETs handling up to 5 A LED current depending on layout, thermal design, and switching frequency.
LM3424MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM3424MH/NOPB FAQ
1.How can I place an order for LM3424MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3424MH/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 LM3424MH/NOPB reliable?
The price and inventory of LM3424MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3424MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3424MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3424MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3424MH/NOPB?
LM3424MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3424MH/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 LM3424MH/NOPB?
For technical support, including LM3424MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3424MH/NOPB requirements.
6.How does Aetrix verify that LM3424MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3424MH/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 LM3424MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3424MH/NOPB?
All LM3424MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3424MH/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 LM3424MH/NOPB part is unused and in its original packaging.
Return procedure for LM3424MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3424MH/NOPB Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
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