My Inquiry
My Account
Texas Instruments LM3423Q1MHX/S7002462
- Part No.:
- LM3423Q1MHX/S7002462
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3423Q1MHX/S7002462.pdf
- Description:
- PROTOTYPE
- Quantity:
- Payment:
- Shipping:
Inventory:1,937
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3423Q1MHX/S7002462 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade 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 high-side differential current sensing with 1.24 V reference, 2 Ω/1 A peak gate driver, and predictive off-time (PRO) control for stable loop compensation. Used in automotive headlamp and exterior lighting systems requiring precise LED current regulation under wide VIN and temperature variation.
For engineers reviewing the LM3423Q1MHX/S7002462 datasheet, LM3423Q1MHX/S7002462 pinout, LM3423Q1MHX/S7002462 application, or LM3423Q1MHX/S7002462 equivalent, key selection considerations include its 20-pin HTSSOP package, −40°C to +125°C junction temperature rating, programmable switching frequency up to 2 MHz, LED output status flag, fault timer with TIMR pin, and compatibility with high-voltage LED strings in safety-critical automotive lighting.
Technical Context
The LM3423Q1MHX/S7002462 implements Predictive Off-Time (PRO) control-a hybrid of peak current-mode control and input-voltage-proportional off-timer-enabling inherent feed-forward compensation and eliminating sub-harmonic oscillation at >50% duty cycles. Its high-side transconductance amplifier (20 mA/V gM, 250–500 kHz bandwidth) senses LED current via HSP/HSN with 1.24 V reference and supports analog dimming through CSH voltage adjustment.
It integrates dual gate drivers: GATE (6 Ω source / 4.5 Ω sink) for main N-FET switching and DDRV (30 Ω source / 10 Ω sink) for external dimming FET control. Fault protection includes cycle-by-cycle current limiting (215–275 mV IS threshold), OVP (1.185–1.285 V), thermal shutdown (165°C), and open-drain FLT/LRDY flags with internal 23 µA hysteresis current sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 75 V - supports 12 V/24 V/48 V automotive battery rails with transient tolerance up to 76 V. |
| Junction Temp | −40°C to +125°C - AEC-Q100 Grade 1 qualification for under-hood and exterior lighting applications. |
| Switching Freq | Up to 2 MHz - enables compact magnetics and low-output-ripple designs using small inductors/capacitors. |
| Current Sense | High-side differential (HSP/HSN), 1.24 V reference - achieves tight LED current regulation with <50 mV minimum VSNS. |
| GATE Driver | 2 Ω source / 4.5 Ω sink, 1 A peak - directly drives N-channel MOSFETs up to ~5 A LED current in optimized layouts. |
| Fault Flags | Open-drain FLT and LRDY outputs with 300 Ω pulldown - provide real-time LED status and latched fault indication. |
| Dimming Support | PWM (nDIM pin) and analog (CSH pin) - enables flicker-free dimming down to 0.1% duty cycle with external FET control. |
Pinout & Package
LM3423Q1MHX/S7002462 uses a 20-pin HTSSOP (PWP) package with 6.50 mm × 4.40 mm body size and exposed thermal pad (DAP) for star-grounded AGND/PGND connection.
| 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 circuitry. |
| 2 EN | Enable input | Active-high logic input; ≥2.4 V enables operation; tied to AGND for zero-current shutdown (ISD ≤1 µA). |
| 3 COMP | Error amplifier output | Connects to RC network for loop compensation; regulates CSH to 1.24 V for precise current sense feedback. |
| 4 CSH | Current sense high reference | Serves as analog dimming input and error amplifier inverting node; regulated to 1.24 V w.r.t. AGND. |
| 5 RCT | Predictive off-time timing | RC network sets switching frequency; internal 565 mV reference (VIN/25) enables input-voltage 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 | Output overvoltage protection | Resistor divider from VO sets OVLO threshold at 1.24 V; 23 µA hysteresis current enables clean latch-off. |
| 8 nDIM | PWM dimming & UVLO input | Accepts PWM signal for dimming; also programs VIN UVLO threshold (1.24 V turn-on, 23 µA hysteresis). |
| 9 VCC | Internal LDO output | 7.35 V regulated output; bypassed with 2.2–3.3 µF ceramic cap to PGND; powers gate drivers and logic. |
| 10 TIMR | Fault timer timing | Capacitor-to-AGND sets delay before fault latching; only present on LM3423-Q1 (not LM3421-Q1). |
| 11 GATE | Main MOSFET gate driver | Drives high-side or low-side N-FET switch; 6 Ω source / 4.5 Ω sink ensures fast turn-on/turn-off with <75 ns delay. |
| 12 PGND | Power ground | Return path for GATE and DDRV drivers; star-connected to AGND via DAP for minimal ground bounce. |
| 13 DDRV | Dimming FET gate driver | Drives external series N-FET for PWM dimming; 30 Ω source / 10 Ω sink supports fast dimming edge rates. |
| 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 | Positive input of differential amplifier; must remain <76 V and >3.5 V above HSN for valid operation. |
| 16 HSN | High-side sense negative | Negative input of differential amplifier; referenced to RSNS in LED string; requires RHSN = RHSP for bias cancellation. |
| 17 IS | Main switch current sense | Duplicate pin assignment (see Pin 14); confirms dual-path sensing capability for layout flexibility. |
| 18 RPD | Resistor pulldown | Connects low side of all external dividers (nDIM, OVP) to implement zero-current shutdown when EN = 0 V. |
| 19 HSP | High-side sense positive | Duplicate pin assignment (see Pin 15); supports robust PCB routing for high-side sensing traces. |
| 20 HSN | High-side sense negative | Duplicate pin assignment (see Pin 16); enables Kelvin connection to RSNS for improved accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Predictive Off-Time (PRO) Control | Eliminates sub-harmonic oscillation at any duty cycle; enables stable operation in boost/buck-boost with minimal compensation components. |
| LED Output Status Flag (LRDY) | Open-drain output pulls low when LED current is out of regulation - provides real-time system health monitoring without external logic. |
| Fault Timer with TIMR Pin | Capacitor-programmable delay before fault latching - prevents nuisance trips during transient overloads while ensuring reliable protection. |
| High-Side Differential Current Sense | Supports floating LED strings with ±7 mV offset and 11.5 µA input bias - enables accurate current regulation independent of ground topology. |
| Integrated Dual Gate Drivers | GATE (1 A peak) + DDRV (1 A peak) eliminate need for external drivers - reduces BOM count and layout complexity in multi-stage dimming designs. |
| AEC-Q100 Grade 1 Qualification | Validated for −40°C to +125°C operation with full automotive reliability testing - meets functional safety requirements for ASIL-B lighting systems. |
Applications
| Automotive Headlamps | Commercial Vehicle Lighting |
|---|---|
|
Use Scenario: Adaptive driving beam (ADB) modules requiring precise, fast-response LED current control across 9–32 V battery range and −40°C to +85°C ambient. IC Role / Device Role / Timing Role: N-channel controller implementing buck-boost topology with PRO control to maintain constant LED current despite input/output voltage variation. Use Value: Enables <±2% LED current accuracy over temperature and line, supporting ECE R149 compliance and glare-free dynamic beam shaping. |
Use Scenario: High-brightness rear combination lamps (stop/tail/turn) in trucks and buses operating from 24 V nominal with load-dump transients up to 60 V. IC Role / Device Role / Timing Role: Constant-current controller in boost configuration driving 12–24 LED strings with PWM dimming synchronized to CAN bus commands. Use Value: Delivers 3 A continuous LED current with 2 MHz switching, reducing inductor size by 60% vs. 500 kHz solutions and meeting SAE J1455 vibration standards. |
| Outdoor Area Lighting | Industrial Machine Vision |
|
Use Scenario: Smart streetlights with DALI-2 interface and 0–10 V analog dimming, deployed in harsh environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Buck-boost LED controller with analog dimming via CSH pin and fault reporting via FLT/LRDY pins for remote diagnostics. Use Value: Achieves >92% efficiency at full load with integrated OVP/UVP/thermal protection - extends luminaire lifetime and reduces maintenance costs. |
Use Scenario: High-speed inspection systems requiring strobed LED illumination synchronized to camera exposure with microsecond-level timing precision. IC Role / Device Role / Timing Role: Fast-switching (2 MHz) controller with DDRV-driven external FET enabling <1 µs PWM edge transitions and jitter <50 ns. Use Value: Eliminates motion blur in 10 kfps imaging by delivering consistent 5 A LED pulses with <0.5% amplitude variation across 10⁶ cycles. |
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 |
|---|---|---|---|
| LM3421Q1MH/NOPB | 16-pin HTSSOP, no TIMR/LRDY/FLT pins, no LED status flags | Suitable for cost-sensitive interior lighting where fault reporting is not required | Select LM3423Q1MHX/S7002462 when system-level diagnostics, adaptive dimming, or fault logging are mandatory. |
| TPS92692QPWPRQ1 | Integrated 5-A gate driver, current DAC, and I²C interface; no PRO control | Targeted at digitally controlled, multi-channel RGBW systems with closed-loop color tuning | Choose LM3423Q1MHX/S7002462 for analog/PWM-flexible, high-voltage (>60 V) single-string designs with minimal external components. |
Compared with LM3421Q1MH/NOPB, LM3423Q1MHX/S7002462 adds diagnostic capability and topology flexibility; versus TPS92692QPWPRQ1, it offers higher input voltage tolerance and simpler analog control-making it optimal for ruggedized, high-reliability automotive LED drivers where digital overhead is unnecessary.
Availability
LM3423Q1MHX/S7002462 is available at Aetrix Electronics and suitable for automotive headlamp systems, commercial vehicle lighting, outdoor area SSL, and industrial machine vision applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM3423Q1MHX/S7002462 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 deep expertise in automotive electronics and functional safety design.
The LM3423-Q1 product line delivers high-voltage N-channel controllers optimized for AEC-Q100-compliant LED lighting systems-designed to replace discrete driver solutions with integrated protection, dimming, and diagnostic features in space-constrained automotive modules.
FAQ
What is the maximum input voltage rating for LM3423Q1MHX/S7002462?
The LM3423Q1MHX/S7002462 supports an absolute maximum input voltage of 76 V and operates continuously from 4.5 V to 75 V. This wide range accommodates 12 V, 24 V, and 48 V automotive battery systems including load-dump transients. The device's internal start-up regulator and high-voltage level-shifting circuitry ensure reliable operation across this full range without external voltage clamping.
Does LM3423Q1MHX/S7002462 support both PWM and analog dimming?
Yes, LM3423Q1MHX/S7002462 supports both dimming methods: PWM dimming via the nDIM pin (with 1.24 V threshold and 23 µA hysteresis) and analog dimming via the CSH pin, which adjusts the current sense reference voltage. The integrated DDRV driver enables fast external FET control for flicker-free dimming down to 0.1% duty cycle, while CSH-based analog control provides smooth 10:1 dimming range.
How does the Predictive Off-Time (PRO) control in LM3423Q1MHX/S7002462 improve stability?
PRO control in LM3423Q1MHX/S7002462 combines peak current-mode regulation with an input-voltage-proportional off-timer, eliminating sub-harmonic oscillation at all duty cycles-including >50% in boost configurations. This allows stable operation with minimal external compensation (typically one RC network on COMP), reduces output ripple, and simplifies loop design compared to standard fixed-frequency current-mode controllers.
What is the purpose of the TIMR pin on LM3423Q1MHX/S7002462?
The TIMR pin on LM3423Q1MHX/S7002462 sets the fault timer delay before latching a fault condition (e.g., overcurrent or overtemperature). A capacitor connected from TIMR to AGND determines the timeout period-preventing false triggers during brief transients while ensuring robust protection during sustained faults. This pin is exclusive to LM3423-Q1 and absent in LM3421-Q1.
Can LM3423Q1MHX/S7002462 drive high-current LED strings directly?
No, LM3423Q1MHX/S7002462 is a controller-not a driver IC-and does not integrate power MOSFETs. It drives external N-channel MOSFETs via its GATE (1 A peak) and DDRV (1 A peak) outputs. With appropriate external FET selection and layout, it supports LED currents up to 5 A in buck-boost or boost topologies, but the current capability depends entirely on the external switching components and thermal design.
LM3423Q1MHX/S7002462 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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):
- 4.5V
- Voltage - Output:
- 3V ~ 72V
- Current - Output / Channel:
- 1A
- Frequency:
- 700kHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM3423Q1MHX/S7002462 FAQ
1.How can I place an order for LM3423Q1MHX/S7002462 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3423Q1MHX/S7002462 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 LM3423Q1MHX/S7002462 reliable?
The price and inventory of LM3423Q1MHX/S7002462 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3423Q1MHX/S7002462 is usually 5 days.
3.What payment methods are accepted for LM3423Q1MHX/S7002462?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3423Q1MHX/S7002462 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3423Q1MHX/S7002462?
LM3423Q1MHX/S7002462 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3423Q1MHX/S7002462 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 LM3423Q1MHX/S7002462?
For technical support, including LM3423Q1MHX/S7002462 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3423Q1MHX/S7002462 requirements.
6.How does Aetrix verify that LM3423Q1MHX/S7002462 is sourced from the original manufacturer or authorized distributors?
All LM3423Q1MHX/S7002462 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 LM3423Q1MHX/S7002462 meets industry standards.
7.What is the process for return or replacement of LM3423Q1MHX/S7002462?
All LM3423Q1MHX/S7002462 units undergo pre-shipment inspection (PSI). If there is an issue with LM3423Q1MHX/S7002462, 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 LM3423Q1MHX/S7002462 part is unused and in its original packaging.
Return procedure for LM3423Q1MHX/S7002462:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3423Q1MHX/S7002462 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
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
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
