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Texas Instruments LM3423Q0MHX/NOPB
- Part No.:
- LM3423Q0MHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3423Q0MHX/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,288
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Product details
Overview
LM3423Q0MHX/NOPB from Texas Instruments is a high-voltage N-channel MOSFET LED controller for constant-current drivers in buck, boost, buck-boost, and SEPIC topologies. It operates from 4.5 V to 75 V input, features predictive off-time (PRO) control, 2-Ω/1-A peak gate drive, and integrated LED output status and fault flags. It is used in automotive exterior lighting and industrial high-brightness LED arrays requiring precise current regulation under wide input voltage variation.
For engineers reviewing the LM3423Q0MHX/NOPB datasheet, LM3423Q0MHX/NOPB pinout, LM3423Q0MHX/NOPB application, or LM3423Q0MHX/NOPB equivalent, key selection criteria include high-side differential current sensing with 1.24 V threshold, AEC-Q100 Grade 0 qualification (–40°C to +150°C), programmable switching frequency up to 2 MHz, cycle-by-cycle current limiting, and dual dimming support (PWM and analog).
Technical Context
The LM3423Q0MHX/NOPB implements Predictive Off-Time (PRO) control - a hybrid of peak current-mode control and input-voltage-proportional off-timer - enabling stable loop compensation without external slope compensation and inherent input feed-forward. It supports high-side current sensing via HSP/HSN pins with transconductance amplifier (20 mA/V typical) and uses an internal 7.35 V LDO regulator (VCC) with 20 mA current limit.
It integrates dedicated fault management including OVP (1.24 V threshold with 23 µA hysteresis source), thermal shutdown (165°C), and a programmable fault timer (TIMR pin). Unlike the LM3421, it provides LED output status flag (LRDY) and open-drain fault flag (FLT), both referenced to VIN and compatible with 75 V max pin voltage ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 75 V - supports 12 V, 24 V, and 48 V industrial/automotive rails with headroom for transients. |
| Switching Frequency | Up to 2 MHz - enables compact magnetics and low-output-ripple designs using small ceramic capacitors. |
| Current Sense Threshold | 1.24 V (typical) at CSH - sets LED current accuracy via external RSNS; supports high-side sensing with <50 mV minimum VSNS for noise immunity. |
| GATE Driver Strength | 2 Ω sourcing / 1.3 Ω sinking (25°C) - drives N-channel MOSFETs up to 5 A average LED current with fast turn-on/turn-off. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| OVP Threshold | 1.24 V at OVP pin with 23 µA hysteresis current - allows precise overvoltage lockout using resistor divider from LED string output. |
| AEC-Q100 Grade | Grade 0 (–40°C to +150°C junction) - qualified for under-hood automotive LED headlamp and fog lamp applications. |
Pinout & Package
LM3423Q0MHX/NOPB is housed in a thermally enhanced 20-pin HTSSOP (PWP) package (6.50 mm × 4.40 mm) with exposed thermal pad (DAP) for star-ground connection between 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 and high-voltage logic. |
| 2 EN | Enable input | Active-high enable with 2.4 V threshold; internal 0.245–2.85 MΩ pulldown enables zero-current shutdown when grounded. |
| 3 COMP | Error amplifier output | Connects to RC network for loop compensation; sinks/sources up to 35 µA; transconductance = 100 µA/V. |
| 4 CSH | Current sense reference | Regulated to 1.24 V; receives signal current (ICSH) from high-side sense amplifier; used for analog dimming. |
| 5 RCT | Off-time timing | External RC sets predictive off-time and switching frequency; internal 565 mV reference (VIN/25) enables input feed-forward. |
| 6 AGND | Analog ground | Reference for CSH, COMP, RCT, TIMR; connected to PGND via DAP copper pad for low-noise sensing. |
| 7 OVP | Overvoltage protection input | 1.24 V threshold with 23 µA hysteresis current; connects to resistor divider from LED string output. |
| 8 nDIM | PWM dimming / UVLO input | Accepts PWM signal (0–5 V); also programs UVLO with resistor divider; 1.24 V threshold with 23 µA hysteresis. |
| 9 VCC | Internal LDO output | 7.35 V regulated supply (6.3–7.35 V); bypassed with 2.2–3.3 µF ceramic cap to PGND; 20 mA current limit. |
| 10 GATE | Main MOSFET gate driver | 2 Ω sourcing / 1.3 Ω sinking (25°C); drives N-channel switch; rated for 75 V max voltage swing. |
| 11 PGND | Power ground | Return path for GATE and DDRV; star-connected to AGND via DAP for EMI and thermal performance. |
| 12 DDRV | Dimming MOSFET gate driver | Drives series dimming FET; 13.5 Ω sourcing / 3.5 Ω sinking (25°C); supports fast PWM dimming. |
| 13 IS | Main switch current sense | Connects to MOSFET drain (RDS-ON sensing) or source-sense resistor; 245 mV current limit threshold. |
| 14 HSN | High-side sense negative | Input to differential transconductance amplifier; paired with HSP; requires RHSN = RHSP for bias cancellation. |
| 15 HSP | High-side sense positive | Input to differential transconductance amplifier; forces VHSP = VHSN via feedback; enables floating LED string sensing. |
| 16 RPD | Resistor pulldown | Connects low side of all external dividers (nDIM, OVP); enables zero-current shutdown when pulled low. |
| 17 IS | Main switch current sense | Duplicate pin assignment per datasheet - same function as Pin 13; used for layout routing flexibility. |
| 18 TIMR | Fault timer input | Capacitor-to-AGND sets delay before fault latching; only present on LM3423/LM3423-Q0 variants. |
| 19 HSP | High-side sense positive | Duplicate pin assignment per datasheet - same function as Pin 15; ensures robust high-side sensing layout. |
| 20 HSN | High-side sense negative | Duplicate pin assignment per datasheet - same function as Pin 14; supports Kelvin sensing of RSNS. |
Key Features
| Feature | Design Value |
|---|---|
| Predictive Off-Time (PRO) Control | Eliminates subharmonic oscillation at >50% duty cycles; enables stable operation across full VIN/VO range without slope compensation. |
| High-Side Differential Current Sensing | HSP/HSN inputs support floating LED strings; 20 mA/V transconductance and 11.5 µA input bias enable ±1% current regulation accuracy. |
| AEC-Q100 Grade 0 Qualification | Validated for –40°C to +150°C operation; includes extended life testing and failure mode analysis for automotive under-hood use. |
| Dual Dimming Interface | Hardware PWM (nDIM pin) and analog dimming (CSH pin) coexist; supports >1000:1 dimming ratio in combined mode. |
| Integrated Fault Management | Separate open-drain FLT (fault flag) and LRDY (LED ready) outputs with VIN-referenced pullup compatibility; TIMR-programmable latch delay. |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving multi-string white LEDs in adaptive front-lighting systems (AFS) with input from 12 V battery and load-dump transients up to 60 V. IC Role / Device Role / Timing Role: Constant-current controller regulating 1.5 A per string across buck-boost topology; PRO control maintains stability during rapid VIN changes. Use Value: AEC-Q100 Grade 0 rating and 75 V absolute max VIN ensure reliability in harsh automotive environments; dual fault flags enable ASIL-B diagnostic coverage. |
Use Scenario: Powering 48 V LED arrays in warehouse high-bay fixtures with 277 VAC rectified input and wide ambient temperature swings. IC Role / Device Role / Timing Role: Boost controller delivering 3.2 A at 60 V output; RCT-based frequency programming optimizes efficiency at 500 kHz switching. Use Value: High-side sensing eliminates ground-referencing constraints; thermal shutdown with 25°C hysteresis prevents nuisance tripping during summer operation. |
| Streetlight LED Drivers | UV-C Disinfection Modules |
|
Use Scenario: Outdoor LED streetlights powered by solar-charged 24 V batteries with dusk-to-dawn dimming and surge protection. IC Role / Device Role / Timing Role: Buck-boost controller supporting 10–36 V input; nDIM accepts 0–10 V analog dimming signal; OVP guards against lightning-induced overvoltage. Use Value: Programmable UVLO (via nDIM divider) enables brownout recovery; RPD pin simplifies zero-power shutdown during maintenance. |
Use Scenario: Driving high-current UVC LEDs (275 nm) in portable disinfection wands requiring precise current control and thermal derating. IC Role / Device Role / Timing Role: Constant-current buck controller with IS pin monitoring MOSFET RDS-ON for cycle-by-cycle limiting; thermal shutdown halts operation above 150°C. Use Value: 1.24 V CSH reference enables <±2% LED current accuracy critical for germicidal dose consistency; compact 20-pin HTSSOP fits space-constrained handheld PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3423MHX/NOPB | Commercial-grade (–40°C to +125°C); lacks LRDY and FLT pins; no TIMR pin; identical pinout and PRO control architecture. | Not qualified for automotive; suitable for indoor general illumination where extended temperature range is unnecessary. | Select LM3423Q0MHX/NOPB when AEC-Q100 Grade 0, fault flag outputs, or thermal robustness beyond +125°C are required. |
| LM3421Q0MHX/NOPB | 16-pin HTSSOP; no LRDY, FLT, TIMR, or DDRV pins; same VIN range, PRO control, and high-side sensing; lacks dimming driver. | Targeted at cost-sensitive, single-dimming-mode (PWM-only) automotive applications with simpler layout requirements. | Choose LM3423Q0MHX/NOPB when dual dimming (PWM + analog), LED status signaling, or higher pin count for layout routing is needed. |
Compared with LM3423MHX/NOPB and LM3421Q0MHX/NOPB, the LM3423Q0MHX/NOPB uniquely combines AEC-Q100 Grade 0 qualification, dual fault/status flags, and integrated dimming driver - making it the only option for safety-critical, thermally demanding, or feature-rich automotive LED systems.
Availability
LM3423Q0MHX/NOPB is available at Aetrix Electronics and suitable for automotive lighting, industrial high-bay fixtures, and outdoor streetlight systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM3423Q0MHX/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-efficiency, high-voltage constant-current LED drivers in automotive, industrial, and architectural lighting - emphasizing robustness, dimming flexibility, and topology agnosticism.
FAQ
What is the operating temperature range of the LM3423Q0MHX/NOPB?
The LM3423Q0MHX/NOPB is qualified to AEC-Q100 Grade 0, supporting continuous operation from –40°C to +150°C junction temperature. This makes it suitable for under-hood automotive applications such as LED headlamps where ambient temperatures exceed 125°C. The device includes thermal shutdown at 165°C with 25°C hysteresis to prevent damage during transient overloads. LM3423Q0MHX/NOPB's thermal metrics (RθJA = 36.7°C/W) are optimized for PCBs with proper DAP grounding and copper pour.
How does the LM3423Q0MHX/NOPB implement high-side current sensing?
The LM3423Q0MHX/NOPB uses differential inputs HSP and HSN to sense voltage across an external LED-string sense resistor (RSNS). The internal transconductance amplifier forces VHSP = VHSN, causing signal current ICSH to flow out of the CSH pin and through RCSH. The error amplifier regulates CSH to 1.24 V, enabling precise LED current calculation: ILED = (1.24 V / RSNS) × (RCSH / RHSP). LM3423Q0MHX/NOPB specifies 20 mA/V transconductance and 11.5 µA input bias for <±1% accuracy. RHSN = RHSP cancels bias current errors.
Can the LM3423Q0MHX/NOPB be used in buck, boost, and buck-boost topologies?
Yes, the LM3423Q0MHX/NOPB is explicitly designed for buck, boost, buck-boost, and SEPIC LED driver topologies. Its N-channel high-side gate driver (GATE), high-side current sense (HSP/HSN), and predictive off-time (PRO) control architecture provide topology flexibility without external compensation redesign. The datasheet includes verified reference schematics for all four configurations. LM3423Q0MHX/NOPB's 75 V absolute max VIN and 75 V pin ratings accommodate boost outputs exceeding 60 V, while its cycle-by-cycle current limit ensures stability in discontinuous conduction mode.
What dimming methods does the LM3423Q0MHX/NOPB support?
The LM3423Q0MHX/NOPB supports both PWM dimming (via nDIM pin) and analog dimming (via CSH pin). PWM dimming accepts standard 0–5 V logic signals with adjustable frequency; analog dimming adjusts LED current by injecting current into CSH to override the 1.24 V reference. Both methods can be used simultaneously for extended dimming range (>1000:1). The integrated DDRV pin drives an external dimming MOSFET, eliminating need for discrete level-shifting. LM3423Q0MHX/NOPB's dual-path capability is documented in TI's SNVS574G datasheet Section 9.1.
What protection features are integrated into the LM3423Q0MHX/NOPB?
The LM3423Q0MHX/NOPB integrates input undervoltage lockout (UVLO via nDIM), output overvoltage protection (OVP via OVP pin), cycle-by-cycle current limiting (IS pin), thermal shutdown (165°C), and zero-current shutdown (RPD pin). It also provides two dedicated fault indicators: open-drain FLT (latched fault flag) and LRDY (LED regulation status). All protections are hardware-based with no firmware dependency. LM3423Q0MHX/NOPB's OVP uses a 1.24 V threshold with 23 µA hysteresis current, allowing precise resistor-divider programming independent of VIN.
LM3423Q0MHX/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:
- 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
LM3423Q0MHX/NOPB FAQ
1.How can I place an order for LM3423Q0MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3423Q0MHX/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 LM3423Q0MHX/NOPB reliable?
The price and inventory of LM3423Q0MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3423Q0MHX/NOPB is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3423Q0MHX/NOPB transactions.
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LM3423Q0MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3423Q0MHX/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 LM3423Q0MHX/NOPB?
For technical support, including LM3423Q0MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3423Q0MHX/NOPB requirements.
6.How does Aetrix verify that LM3423Q0MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3423Q0MHX/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 LM3423Q0MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3423Q0MHX/NOPB?
All LM3423Q0MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3423Q0MHX/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 LM3423Q0MHX/NOPB part is unused and in its original packaging.
Return procedure for LM3423Q0MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3423Q0MHX/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
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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