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Texas Instruments LM3423Q0MH/NOPB
- Part No.:
- LM3423Q0MH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3423Q0MH/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,140
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Product details
Overview
LM3423Q0MH/NOPB from Texas Instruments is an AEC-Q100 Grade 0 qualified high-voltage N-channel MOSFET controller for constant-current LED drivers, supporting buck, boost, buck-boost, and SEPIC topologies. It operates from 4.5 V to 75 V input, features predictive off-time (PRO) control, 1.24 V adjustable high-side current sense threshold, and integrated LED output status and fault status flags. It is used in automotive exterior lighting and industrial high-reliability SSL systems.
For engineers reviewing the LM3423Q0MH/NOPB datasheet, LM3423Q0MH/NOPB pinout, LM3423Q0MH/NOPB application, or LM3423Q0MH/NOPB equivalent, key selection criteria include its Grade 0 automotive qualification, dual flag outputs (LED ready and fault), 20-pin HTSSOP package with thermal pad, and compatibility with high-side current sensing in floating LED strings.
Technical Context
The LM3423Q0MH/NOPB implements Predictive Off-Time (PRO) control-a hybrid of peak current-mode regulation and input-voltage-proportional off-timer-to enable stable loop compensation and inherent input feed-forward without sub-harmonic oscillation. Its high-side transconductance amplifier (20 mA/V gM) senses differential voltage across an external LED-string sense resistor with 1.24 V reference and ±7 mV offset.
It integrates two independent gate drivers: a 2-Ω/4.5-Ω (source/sink) main GATE driver for the power switch and a 30-Ω/10-Ω DDRV driver for external dimming FETs. Fault management includes programmable timer-based latching via TIMR capacitor, OVP threshold at 1.24 V with 23 µA hysteresis source, and thermal shutdown at 165°C with 25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 75 V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Current Sense Threshold | 1.24 V (±5%) - sets precise LED current via external RSNS; enables <50 mV minimum VSNS for accuracy. |
| Switching Frequency | Up to 2 MHz - set by RCT/CT network; enables compact magnetics and low-output-ripple designs. |
| GATE Driver Strength | 2 Ω sourcing / 4.5 Ω sinking - drives N-channel MOSFET gates up to 1 A peak with fast edge rates. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects against sustained overload or poor heatsinking in enclosed fixtures. |
| OVP Threshold | 1.24 V with 23 µA hysteresis current - allows accurate overvoltage lockout using resistor divider from VO. |
| Qualification | AEC-Q100 Grade 0 (–40°C to +150°C) - certified for under-hood automotive LED headlamp and DRL applications. |
Pinout & Package
LM3423Q0MH/NOPB uses a 20-pin HTSSOP package (6.50 mm × 4.40 mm) with exposed thermal pad (DAP) for enhanced thermal performance. The DAP must be star-grounded to both AGND and PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Main input supply | Bypassed with 100 nF ceramic capacitor to AGND; powers internal start-up regulator. |
| 2 EN | Enable input | Logic-high (>2.4 V) enables operation; pulled down internally (0.245–2.85 MΩ) for zero-current shutdown. |
| 3 COMP | Error amplifier output | Connects to compensation network (capacitor to AGND); regulates CSH to 1.24 V for current control. |
| 4 CSH | Current sense amplifier output | Sinks 100 µA nominal signal current; used for analog dimming or feedback loop closure. |
| 5 RCT | Predictive off-time timing | RC network sets switching frequency; internal 565 mV reference enables VIN-proportional off-time. |
| 6 AGND | Analog ground reference | Return for CSH, COMP, RCT, TIMR; connected to PGND via DAP copper pad. |
| 7 OVP | Output overvoltage sense | Resistor divider from VO sets 1.24 V trip point; 23 µA hysteresis current enables clean latch behavior. |
| 8 nDIM | PWM dimming input / UVLO | Accepts PWM signal for LED dimming; also programs input UVLO threshold (1.24 V turn-on). |
| 9 VCC | Internal LDO output | 7.35 V regulated output; bypassed with 2.2–3.3 µF ceramic cap to PGND for gate drive stability. |
| 10 TIMR | Fault timer timing | Capacitor to AGND sets delay before fault latching; only present on LM3423/LM3423-Q0 variants. |
| 11 GATE | Main MOSFET gate driver | 2 Ω source / 4.5 Ω sink; drives N-channel switch with 1 A peak current capability. |
| 12 PGND | Power ground return | Return path for GATE and DDRV drivers; connected to AGND via DAP for low-impedance layout. |
| 13 DDRV | Dimming FET gate driver | 30 Ω source / 10 Ω sink; drives external series dimming MOSFET for fast PWM dimming. |
| 14 IS | Main switch current sense | Connects to MOSFET drain (RDS(on) sensing) or source resistor for cycle-by-cycle current limiting. |
| 15 HSP | High-side sense positive | Connects to LED-string high side; forms differential pair with HSN for floating current measurement. |
| 16 HSN | High-side sense negative | Connects to LED-string low side; matched bias current cancellation improves accuracy vs. common-mode noise. |
| 17 IS | Main switch current sense | Duplicate pin label per datasheet; same function as Pin 14 - used for RDS(on) or resistor-based current limit. |
| 18 RPD | Resistor pulldown node | Connects low side of all external dividers (nDIM, OVP); enables zero-current shutdown when pulled to AGND. |
| 19 HSP | High-side sense positive | Duplicate pin label per datasheet; same function as Pin 15 - ensures robust high-side sensing in noisy environments. |
| 20 HSN | High-side sense negative | Duplicate pin label per datasheet; same function as Pin 16 - completes differential sensing path for LED current. |
Key Features
| Feature | Design Value |
|---|---|
| LED Output Status Flag (LRDY) | Open-drain output pulls low when LED current is out of regulation - enables real-time system health monitoring. |
| Fault Status Flag with Timer (FLT) | Latches fault condition (OVP, thermal, etc.) after programmable TIMR delay - supports fail-safe shutdown in safety-critical lighting. |
| Predictive Off-Time (PRO) Control | Eliminates sub-harmonic oscillation at >50% duty cycles - simplifies compensation and enables stable high-ratio boost operation. |
| Adjustable High-Side Current Sense | 1.24 V reference with ±7 mV offset and 20 mA/V transconductance - achieves <±3% LED current accuracy across temperature. |
| AEC-Q100 Grade 0 Qualification | Rated for –40°C to +150°C junction temperature - validated for under-hood automotive LED headlamps and fog lamps. |
Applications
| Automotive Headlamp Systems | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving high-power white LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Primary constant-current controller managing buck-boost topology with 12–48 V input and 30–60 V LED string output. Use Value: Grade 0 qualification ensures reliable operation at 150°C ambient; dual flags (LRDY/FLT) support ASIL-B diagnostic coverage. |
Use Scenario: Powering 100–200 W LED luminaires in warehouse ceilings with 277 VAC rectified input and long cable runs. IC Role / Device Role / Timing Role: Controller in boost topology regulating 1.5 A LED current with OVP protection against open-circuit faults. Use Value: 75 V max VIN accommodates 277 VAC line peaks; PRO control maintains stability despite wide input/output voltage variation. |
| Streetlight LED Drivers | UV-C Disinfection Modules |
|
Use Scenario: Outdoor LED streetlights requiring surge immunity, thermal derating, and dusk-to-dawn dimming via 0–10 V interface. IC Role / Device Role / Timing Role: Constant-current controller in SEPIC topology enabling buck-boost operation across 90–305 VAC input range. Use Value: nDIM pin accepts analog 0–10 V signal for smooth dimming; RPD pin enables zero-current shutdown during grid outage. |
Use Scenario: Driving high-efficiency UVC LEDs (265 nm) in portable sterilization devices with battery-powered 12–24 V input. IC Role / Device Role / Timing Role: Buck controller regulating precise 350 mA current for UVC LED lifetime control and optical output stability. Use Value: High-side sensing avoids ground-loop interference in isolated battery systems; 1.24 V CSH reference minimizes sense resistor power loss. |
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 | Commercial-grade (–40°C to +125°C), lacks TIMR and FLT pins; no AEC-Q100 qualification. | Suitable for non-automotive indoor lighting where Grade 0 reliability is not required. | Select LM3423MH/NOPB only if Grade 0 qualification, fault latching, or LED-ready flag are unnecessary. |
| LM3423Q1MH/NOPB | AEC-Q100 Grade 1 (–40°C to +125°C); identical pinout and feature set except reduced temperature rating. | Valid for cabin lighting or rear-lamp modules where under-hood temperature extremes are absent. | Choose LM3423Q1MH/NOPB when Grade 0 is over-specified but automotive qualification remains mandatory. |
Compared with LM3423MH/NOPB and LM3423Q1MH/NOPB, the LM3423Q0MH/NOPB uniquely delivers full Grade 0 operation, integrated FLT latching, and LRDY status-making it the sole choice for safety-critical, high-temperature automotive LED control.
Availability
LM3423Q0MH/NOPB is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-bay lighting, outdoor streetlight drivers, and UV-C disinfection modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM3423Q0MH/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 specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and automotive ICs.
The LM342x family was designed specifically for high-reliability constant-current LED driver applications across automotive, industrial, and architectural lighting - emphasizing topology flexibility, wide input range, and robust fault handling.
FAQ
What is the operating temperature range of the LM3423Q0MH/NOPB?
The LM3423Q0MH/NOPB is qualified to AEC-Q100 Grade 0, with a guaranteed operating junction temperature range of –40°C to +150°C. This specification is validated per automotive stress-test standards and enables use in under-hood LED headlamp modules where ambient temperatures exceed 125°C. The device incorporates thermal shutdown at 165°C with 25°C hysteresis to prevent damage during transient overloads. LM3423Q0MH/NOPB's thermal design relies on proper PCB copper area under the DAP pad for effective heat dissipation.
Does the LM3423Q0MH/NOPB support both analog and PWM dimming?
Yes, the LM3423Q0MH/NOPB supports both dimming methods. Analog dimming is implemented by injecting a controlled current into the CSH pin, which directly modulates the 1.24 V error amplifier reference. PWM dimming uses the nDIM pin to accept external logic-level signals up to 20 kHz, controlling LED current via rapid enable/disable cycling. The DDRV pin provides dedicated gate drive for an external dimming FET to ensure fast, low-loss switching. LM3423Q0MH/NOPB's dual-path dimming architecture allows coexistence or independent use based on system requirements.
How does the predictive off-time (PRO) control in LM3423Q0MH/NOPB improve design stability?
PRO control in the LM3423Q0MH/NOPB combines peak current-mode regulation with an input-voltage-proportional off-timer, eliminating sub-harmonic oscillation that occurs in standard fixed-frequency current-mode controllers above 50% duty cycle. This enables stable operation across wide input/output voltage ratios - especially critical in boost and buck-boost LED drivers. The method reduces reliance on complex Type II/III compensation networks, allowing simpler RC-based loop tuning. LM3423Q0MH/NOPB's PRO architecture is confirmed in TI's SNVS574G datasheet Section 8.3.2 and validated in typical boost/buck-boost efficiency curves.
What is the purpose of the RPD pin on the LM3423Q0MH/NOPB?
The RPD (Resistor Pulldown) pin on the LM3423Q0MH/NOPB serves as a common low-side connection point for all external resistor dividers - including those for nDIM (UVLO) and OVP - enabling zero-current shutdown when pulled to AGND. Internally, RPD connects to a 145 Ω (typical) pulldown MOSFET, allowing the entire controller to enter ultra-low-quiescent state (<1 µA) without external switches. This feature is essential for automotive "always-on" systems requiring low standby power. LM3423Q0MH/NOPB's RPD functionality is distinct from EN and is documented in Pin Functions Table on page 6 of SNVS574G.
Can the LM3423Q0MH/NOPB be used in buck, boost, and SEPIC topologies?
Yes, the LM3423Q0MH/NOPB is explicitly designed for topology flexibility: buck, boost, buck-boost, and SEPIC configurations are all supported per TI's device description and typical application schematics. Its high-side current sense architecture (HSP/HSN pins), predictive off-time control, and wide 4.5–75 V input range allow seamless reconfiguration. For example, in boost mode, the main switch is low-side referenced; in buck mode, the LED string floats while the controller senses current on the high side. LM3423Q0MH/NOPB's versatility is validated in Figures 32–35 of SNVS574G and confirmed in Section 3 ("Description").
LM3423Q0MH/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:
- 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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM3423Q0MH/NOPB FAQ
1.How can I place an order for LM3423Q0MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3423Q0MH/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 LM3423Q0MH/NOPB reliable?
The price and inventory of LM3423Q0MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3423Q0MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3423Q0MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3423Q0MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3423Q0MH/NOPB?
LM3423Q0MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3423Q0MH/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 LM3423Q0MH/NOPB?
For technical support, including LM3423Q0MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3423Q0MH/NOPB requirements.
6.How does Aetrix verify that LM3423Q0MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3423Q0MH/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 LM3423Q0MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3423Q0MH/NOPB?
All LM3423Q0MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3423Q0MH/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 LM3423Q0MH/NOPB part is unused and in its original packaging.
Return procedure for LM3423Q0MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3423Q0MH/NOPB Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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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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