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Texas Instruments LM3424QMH/NOPB
- Part No.:
- LM3424QMH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3424QMH/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,300
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Product details
Overview
LM3424QMH/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 analog/PWM dimming in outdoor area lighting and industrial SSL systems.
For engineers reviewing the LM3424QMH/NOPB datasheet, LM3424QMH/NOPB pinout, LM3424QMH/NOPB application, or LM3424QMH/NOPB equivalent, key selection criteria include its 75 V VIN rating, thermal foldback programmability, cycle-by-cycle current limiting, adjustable switching frequency up to 2.0 MHz, and compatibility with high-side current sense architectures for efficiency-critical LED drivers.
Technical Context
The LM3424QMH/NOPB implements peak current-mode control with inherent input voltage feed-forward compensation, using an external timing resistor (RT) to set switching frequency from 164 kHz to 669 kHz and support external synchronization. Its error amplifier regulates CSH to 1.24 V with transconductance of 100 µA/V and 1 MHz bandwidth, enabling stable loop response across wide operating conditions.
Thermal management is implemented via dedicated TSENSE/TREF/TGAIN pins that configure a programmable foldback breakpoint and slope using resistor dividers and thermistors; the VS pin provides a 2.45 V reference for this circuitry. The controller integrates separate gate drivers: GATE (2 Ω sourcing/4.5 Ω sinking) for the main NFET and DDRV (13.5 Ω sourcing/3.5 Ω sinking) for external PWM dimming MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 75 V - supports wide-input industrial and automotive LED systems without pre-regulation. |
| Switching Frequency | 164–669 kHz - programmable via RT pin; enables optimization of size, efficiency, and EMI in boost/buck-boost designs. |
| GATE Driver Strength | 2 Ω sourcing / 4.5 Ω sinking - drives high-side N-channel MOSFETs with fast turn-on/turn-off for >90% efficiency at 1 A LED current. |
| CSH Reference Voltage | 1.24 V ±25 mV - sets LED current accuracy baseline; used with external resistors to achieve ±3% ILED regulation. |
| Thermal Foldback | Programmable breakpoint & slope - enables precise LED derating from junction temperature rise, preventing thermal runaway. |
| Current Sense Architecture | High-side differential (HSP/HSN) - eliminates ground path interference and supports floating LED loads in all topologies. |
| OVP Threshold | 1.24 V on OVP pin - protects output stage by disabling switching when VO exceeds programmed level via resistor divider. |
Pinout & Package
LM3424QMH/NOPB is housed in a thermally enhanced HTSSOP-20 package (6.50 mm × 4.40 mm) with exposed PowerPAD™ for low RθJC(bot) = 1.9 °C/W. Pin numbering follows standard top-view layout with GND-connected DAP for optimal thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Bypassed with 100 nF capacitor; powers internal regulator and withstands transients up to 76 V. |
| 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; sinks/sources up to 35 µA for stability tuning. |
| CSH | Current sense reference node | Regulated to 1.24 V; sums high-side amplifier current and thermal foldback current for ILED control. |
| RT/SYNC | Oscillator timing & sync input | Resistor-to-GND sets fSW; accepts external clock signal ≥3.5 V for synchronized multi-phase operation. |
| nDIM | Dimming/UVLO input | Accepts PWM signal or resistor divider; also programs input undervoltage lockout threshold (1.24 V). |
| SS | Soft-start control | Capacitor-to-GND extends startup time linearly; prevents inrush current in high-capacitance LED strings. |
| TGAIN | Foldback slope programming | Resistor-to-GND sets thermal foldback slope; adjusts ILED reduction rate per °C above breakpoint. |
| TSENSE | Temperature sense input | Connects to thermistor/resistor divider; detects LED junction temperature for foldback activation. |
| TREF | Foldback reference input | Resistor divider from VS sets foldback breakpoint voltage; defines temperature where ILED reduction begins. |
| VS | Internal reference output | 2.45 V ±50 mV precision reference; powers external thermal sensing circuitry and stabilizes foldback accuracy. |
| OVP | Output overvoltage detection | Resistor divider from VO triggers shutdown when voltage exceeds 1.24 V threshold. |
| DDRV | Dimming MOSFET driver | Drives external NFET gate for high-speed PWM dimming; 13.5 Ω sourcing ensures <700 ns rise time. |
| GND | Power and signal ground | Must be connected to DAP; serves as return path for all analog and power circuits. |
| GATE | Main switch driver output | Drives gate of external high-side N-channel MOSFET; 2 Ω sourcing enables <240 ns turn-on at 1 A load. |
| VCC | Internal LDO output | 7.35 V regulated output; bypassed with 2.2–3.3 µF ceramic capacitor for gate driver and bias stability. |
| IS | Main switch current sense | Connects to MOSFET source or RDS-ON path; enables cycle-by-cycle current limiting at 245 mV threshold. |
| SLOPE | Slope compensation input | Resistor-to-GND adds artificial ramp to COMP signal; prevents subharmonic oscillation above 50% duty cycle. |
| HSN | High-side sense negative | Input to differential amplifier; paired with HSP to reject common-mode noise in LED string sensing. |
| HSP | High-side sense positive | Input to differential amplifier; referenced to LED cathode for accurate current measurement in boost configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable thermal foldback | Enables safe LED derating via user-defined breakpoint and slope-critical for high-power outdoor luminaires. |
| High-side differential current sense | Supports floating LED loads in all topologies while maintaining ±3% current regulation accuracy and noise immunity. |
| 2.0 MHz max switching frequency | Reduces magnetics size and improves transient response in space-constrained applications like architectural lighting. |
| Dual gate drivers (GATE + DDRV) | Separate 1-A main driver and dimming driver eliminate need for external level shifters in PWM-dimming systems. |
| Input UVLO & output OVP protection | Prevents damage during brownout or open-circuit LED failure-essential for unattended industrial lighting deployments. |
Applications
| Street Lighting | Industrial High-Bay Fixtures |
|---|---|
|
Use Scenario: Outdoor LED streetlights powered from 48 V DC or 120–277 V AC via offline rectifier, operating continuously in ambient temperatures from –40°C to +85°C. IC Role / Device Role / Timing Role: Constant-current controller managing boost topology with thermal foldback to prevent LED lumen depreciation at elevated junction temperatures. Use Value: Maintains ±3% ILED regulation across 4.5–75 V input range and enables programmable thermal derating to extend LED lifetime beyond 50,000 hours. |
Use Scenario: High-bay warehouse lighting using 12–24 V LED arrays driven from 24–48 V DC bus, requiring robust overvoltage protection during load transients. IC Role / Device Role / Timing Role: Buck-boost controller with integrated OVP and cycle-by-cycle current limit, ensuring fault tolerance in high-noise industrial environments. Use Value: Delivers >92% efficiency at 2 A LED current while protecting against open-string failures via OVP shutdown and thermal foldback. |
| Architectural Accent Lighting | UV-C Sterilization Modules |
|
Use Scenario: Dimmable RGBW LED strips in commercial buildings, requiring smooth 0–100% analog dimming and flicker-free PWM dimming at 1–20 kHz. IC Role / Device Role / Timing Role: Dual-dimming controller using CSH for analog dimming and DDRV for high-speed PWM dimming with <700 ns propagation delay. Use Value: Achieves 10-bit dimming resolution via analog control and 20 kHz PWM without audible noise-meeting DALI-2 and Zhaga compliance. |
Use Scenario: Pulsed UV-C LED arrays for disinfection systems, demanding precise current control during short high-current pulses (e.g., 1 A for 100 ms). IC Role / Device Role / Timing Role: Peak-current-mode controller with programmable soft-start and leading-edge blanking (tON-MIN = 240 ns) to prevent false triggering during pulse edges. Use Value: Enables accurate 1 A ±2% pulsed current delivery with thermal foldback to protect UV-C LEDs from rapid degradation at >85°C junction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3423QMH/NOPB | Lacks thermal foldback circuitry and TSENSE/TREF/TGAIN pins; no programmable temperature derating capability. | Suitable only for ambient-temperature-stable indoor lighting; cannot replace LM3424QMH/NOPB in outdoor or high-power thermal environments. | Select LM3423QMH/NOPB only when thermal management is handled externally or unnecessary. |
| TPS92692QPWPRQ1 | Includes integrated 5-V LDO, current-sense amplifier, and spread-spectrum modulation; requires external MOSFET but lacks DDRV dimming driver. | Designed for automotive AEC-Q100 Grade 1; supports ASIL-B functional safety but has narrower 4.5–65 V VIN range. | Choose TPS92692QPWPRQ1 for automotive headlight modules needing built-in diagnostics and safety compliance. |
Compared with LM3423QMH/NOPB and TPS92692QPWPRQ1, the LM3424QMH/NOPB uniquely combines thermal foldback programmability, dual gate drivers (GATE + DDRV), and 75 V input capability-making it the only option for high-reliability outdoor LED drivers requiring both robust protection and flexible dimming.
Availability
LM3424QMH/NOPB is available at Aetrix Electronics and suitable for street lighting, industrial high-bay fixtures, architectural accent lighting, UV-C sterilization modules, and general illumination systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM3424QMH/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 delivering analog, embedded processing, and connectivity solutions with focus on reliability, energy efficiency, and system-level innovation.
The LM3424QMH/NOPB belongs to TI's LED lighting controller product line, designed specifically for high-voltage, thermally adaptive constant-current regulation in outdoor, industrial, and specialty lighting applications.
FAQ
What topologies does the LM3424QMH/NOPB support?
The LM3424QMH/NOPB supports buck, boost, buck-boost, and SEPIC LED driver topologies. Its high-side current sense architecture and N-channel MOSFET gate driver enable flexible implementation in all four configurations without requiring level-shifting circuitry. This versatility allows designers to select the optimal topology based on input/output voltage relationships and efficiency targets.
How does thermal foldback work on the LM3424QMH/NOPB?
Thermal foldback on the LM3424QMH/NOPB is implemented via three dedicated pins: TSENSE, TREF, and TGAIN. A thermistor/resistor divider on TSENSE detects LED temperature; TREF sets the foldback breakpoint voltage; and TGAIN programs the slope of current reduction. The resulting ITF current injects into the CSH node, reducing regulated LED current proportionally above the breakpoint-preventing thermal runaway without external components.
Can the LM3424QMH/NOPB drive both analog and PWM dimming simultaneously?
No-the LM3424QMH/NOPB supports either analog dimming (via CSH pin voltage adjustment) or PWM dimming (via nDIM input controlling DDRV output), but not simultaneous operation. Analog dimming varies LED current amplitude directly; PWM dimming switches the LED string on/off at high frequency using an external MOSFET driven by DDRV. Both methods are mutually exclusive in a single design due to shared control path architecture.
What is the purpose of the DDRV pin on the LM3424QMH/NOPB?
The DDRV pin on the LM3424QMH/NOPB is a dedicated dimming gate driver output that controls an external N-channel MOSFET placed in series with the LED string. It provides 13.5 Ω sourcing and 3.5 Ω sinking impedance, enabling fast switching (<700 ns rise/fall) for flicker-free PWM dimming up to 20 kHz. This eliminates the need for additional driver stages in high-performance dimming systems.
Does the LM3424QMH/NOPB include overvoltage protection?
Yes-the LM3424QMH/NOPB includes programmable output overvoltage protection (OVP) via the OVP pin. A resistor divider from the LED string output to the OVP pin sets the trip threshold at 1.24 V. When exceeded, the controller disables switching immediately, protecting downstream components from overvoltage stress during open-circuit or component-failure conditions.
LM3424QMH/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM3424QMH/NOPB FAQ
1.How can I place an order for LM3424QMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3424QMH/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 LM3424QMH/NOPB reliable?
The price and inventory of LM3424QMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3424QMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3424QMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3424QMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3424QMH/NOPB?
LM3424QMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3424QMH/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 LM3424QMH/NOPB?
For technical support, including LM3424QMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3424QMH/NOPB requirements.
6.How does Aetrix verify that LM3424QMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3424QMH/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 LM3424QMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3424QMH/NOPB?
All LM3424QMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3424QMH/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 LM3424QMH/NOPB part is unused and in its original packaging.
Return procedure for LM3424QMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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