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Diodes Incorporated ZXLD1374EST20TC
- Part No.:
- ZXLD1374EST20TC
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ZXLD1374EST20TC.pdf
- Description:
- IC LED DRV RGLTR PWM 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,537
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Product details
Overview
ZXLD1374EST20TC from Diodes Incorporated is a 60V, 1.5A integrated low-side switch LED driver IC supporting Buck, Boost, and Buck-Boost topologies. It delivers ±0.5% typical output current accuracy, operates from −40°C to +125°C (AEC-Q100 Grade 1), and enables precise dimming via DC control (20:1) and high-frequency PWM (1000:1 at 500Hz). It drives up to 16-series LEDs in automotive lighting and industrial signage applications.
For engineers reviewing the ZXLD1374EST20TC datasheet, ZXLD1374EST20TC pinout, ZXLD1374EST20TC application, or ZXLD1374EST20TC equivalent, key selection considerations include its multi-topology flexibility, thermal current adjustment via TADJ, dual-fault diagnostics (FLAG + STATUS analog voltage levels), and TSSOP-20EP package with exposed thermal pad for high-power LED thermal management.
Technical Context
The ZXLD1374 uses a modified hysteretic control architecture with patent-pending feedback that maintains <±0.5% LED current accuracy across all three topologies. Its switching frequency is internally regulated near 400kHz (300–1000kHz range), with propagation delays under 135ns and LX rise/fall times of 208ns/12ns respectively.
Fault detection is implemented through two dedicated pins: FLAG provides open-drain fault assertion, while STATUS delivers graded analog voltage levels (4.5V nominal down to 0.6V) indicating specific conditions-e.g., over-temperature (1.8V), over-current (0.9V), or LX stall (3.6V)-enabling real-time system-level diagnostics without external ADCs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Buck, Boost, Buck-Boost - enables single-IC design across varying input-to-LED voltage ratios (e.g., 6.3–60V input driving 3–48V LED strings). |
| Output Current Accuracy | ±0.5% typical - ensures consistent luminance across temperature and line variations without calibration. |
| Integrated Switch | 1.5A low-side MOSFET with 0.8Ω RDS(ON) - eliminates external switch, reduces BOM count, and supports continuous 1.5A LED load. |
| Dimming Range | 1000:1 at 500Hz PWM - meets stringent automotive rear lighting requirements for smooth, flicker-free intensity control. |
| Thermal Protection | 150°C shutdown / 125°C restart - prevents LED degradation by dynamically reducing current above threshold via TADJ thermistor network. |
| Ambient Temp Range | −40°C to +125°C - qualified per AEC-Q100 Grade 1, suitable for under-hood and exterior lighting environments. |
| Supply Voltage | 6.3V to 60V input - accommodates 12V/24V/48V vehicle architectures and wide-input industrial power rails. |
Pinout & Package
TSSOP-20EP package with exposed thermal pad (EP) for enhanced thermal dissipation; 0.65mm pitch, RoHS-compliant, halogen/antimony-free "Green" molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ADJ (1) | DC current control input | Adjusts LED current from 10% to 200% of set value using 0.125–2.5V DC voltage; internal clamp limits node to <3V for overdrive protection. |
| REF (2) | 1.25V reference output | Stable 1.25V reference used to bias ADJ, GI, and TADJ networks; ±50ppm/°C TC ensures precision over temperature. |
| TADJ (3) | Thermal compensation input | Accepts thermistor divider to reduce LED current above preset junction temperature; thresholds at 625mV (upper) and 440mV (lower). |
| SHP (4) | Loop compensation node | Connects 100pF capacitor to ground to stabilize hysteretic control loop; critical for stable operation across topologies. |
| STATUS (5) | Analog fault status output | Delivers graded voltage (4.5V normal → 0.6V over-current) enabling discrete fault identification without microcontroller ADC. |
| SGND (6), PGND (7,8) | Signal and power ground | Separate ground paths minimize noise coupling; must be tied together at single point near EP pad for EMI and thermal integrity. |
| LX (13,14) | Low-side switch output | Drives external inductor; pins tied internally - requires shared PCB copper pour for 1.5A continuous current and thermal relief. |
| VAUX (15) | Auxiliary gate drive supply | Accepts 6–15V auxiliary supply to reduce internal power loss when VIN >24V; improves efficiency in high-input-voltage Boost/Buck-Boost. |
| VIN (16) | Main input supply | 6.3–60V input with UVLO (5.6V turn-on); decoupling capacitor required close to pin for transient stability. |
| ISM (17) | Current sense monitor input | Measures VSENSE = 218mV (Buck) or 225mV (Boost/Buck-Boost) across external sense resistor for accurate current regulation. |
| FLAG (18) | Open-drain fault flag | Pulls low on fault (over-temp, over-current, UVLO, stall); high-impedance otherwise - simplifies OR'ing multiple drivers. |
| PWM (19) | Digital dimming input | Accepts 3.3V/5V logic; 100–500Hz PWM preserves 1000:1 resolution; 15ms low pulse triggers standby mode. |
| GI (20) | Gain setting input | Sets switch-to-LED current ratio in Boost/Buck-Boost modes (0.20–0.50 ratio); connected to ADJ in Buck mode. |
| EP Pad | Exposed thermal pad | Must be soldered to 0V plane for electrical safety and thermal conduction; contributes to θJA = 28°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-topology flexibility | Single IC replaces separate Buck/Boost drivers - reduces design time and inventory SKUs for variable LED string configurations. |
| Graded analog STATUS output | Eliminates need for external fault decoding circuitry - enables direct connection to comparator or MCU GPIO with minimal external components. |
| Thermal derating via TADJ | Prevents LED thermal runaway by scaling current based on measured junction temperature - extends LED lifetime in enclosed fixtures. |
| 1.5A integrated low-side switch | Removes external MOSFET and gate driver - reduces board area by ~25mm² and simplifies layout for high-current LED traces. |
| 1000:1 PWM dimming at 500Hz | Meets UNECE R149 and SAE J1383 requirements for automotive stop/tail lamps - avoids visible flicker and EMI peaks. |
Applications
| Automotive Exterior Lighting | Industrial High-Bay Signage |
|---|---|
Use Scenario: Driving 12–16 white LEDs in truck stop/tail lamps powered from 24V battery with wide temperature swings. IC Role / Device Role / Timing Role: Primary LED current regulator and topology selector; manages dynamic input transients during load dump (60V surge) and cold-crank (6.3V dip). Use Value: Maintains ±0.5% current accuracy across −40°C to +125°C ambient, ensuring consistent photometric output without recalibration. | Use Scenario: Powering 8–10 high-lumen LED modules in warehouse ceiling signs operating continuously at 48V DC input. IC Role / Device Role / Timing Role: Constant-current controller in Boost configuration; regulates current despite LED forward voltage drift over 50,000-hour life. Use Value: Thermal derating via TADJ prevents LED lumen depreciation by reducing drive current above 85°C case temperature. |
| Commercial Architectural Lighting | Off-Highway Vehicle Lighting |
Use Scenario: Dimmable linear LED strips in retail display cases requiring smooth 1000:1 brightness control. IC Role / Device Role / Timing Role: PWM-controlled current source with DC offset trim; synchronizes dimming across multiple ZXLD1374 channels via common PWM signal. Use Value: 500Hz PWM frequency avoids audible noise in quiet environments while preserving full dimming resolution. | Use Scenario: Harsh-environment work lights on excavators with 12V/24V dual-battery systems and vibration exposure. IC Role / Device Role / Timing Role: Robust LED driver with AEC-Q100 qualification and dual-fault reporting (FLAG + STATUS) for predictive maintenance alerts. Use Value: STATUS analog voltage levels enable field technicians to diagnose faults (e.g., 2.7V = LX overvoltage) using only a multimeter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-topology LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862SP-13 | 40V max input, 1.2A switch, no integrated TADJ thermal control; uses external op-amp for current sensing. | Limited to lower-voltage automotive cabins; lacks graded fault reporting - requires external ADC for STATUS-like diagnostics. | Select when cost sensitivity outweighs thermal management needs and input voltage stays ≤40V. |
| LM3409QMY/NOPB | 42V max input, 2.5A switch, external MOSFET required; no integrated STATUS analog output - only digital FAULT flag. | Requires additional gate driver and sense amplifier; supports higher current but adds complexity and board space. | Choose for >1.5A loads where external FET selection is preferred, accepting added component count and no analog fault grading. |
Compared with AL8862SP-13 and LM3409QMY/NOPB, the ZXLD1374EST20TC uniquely combines 60V operation, integrated 1.5A switch, AEC-Q100 Grade 1 rating, and analog STATUS voltage grading - delivering higher integration, broader input range, and simpler fault diagnosis in space-constrained automotive and industrial LED systems.
Availability
ZXLD1374EST20TC is available at Aetrix Electronics and suitable for automotive exterior lighting, industrial high-bay signage, commercial architectural lighting, and off-highway vehicle lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ZXLD1374EST20TC 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets.
The ZXLD1374 belongs to Diodes' high-reliability LED driver product line, designed specifically for AEC-Q100-compliant automotive lighting and demanding industrial LED applications requiring multi-topology flexibility and precision current regulation.
FAQ
What is the purpose of the SHP pin and how is it used?
The SHP (Shaping) pin connects to a 100pF ±20% capacitor to ground, providing loop compensation for the modified hysteretic control architecture. This capacitor stabilizes feedback response across Buck, Boost, and Buck-Boost topologies, preventing oscillation and ensuring consistent current regulation. Incorrect capacitance causes erratic switching or failure to regulate - the value must be tightly controlled and placed close to the pin.
How does the STATUS pin differentiate between fault conditions?
The STATUS pin outputs distinct analog voltage levels: 4.5V (normal), 3.6V (out-of-regulation or UVLO), 2.7V (LX overvoltage), 1.8V (over-temperature), and 0.9V (over-current or excessive switch current). These voltages are mutually exclusive and prioritized - e.g., over-temperature overrides out-of-regulation - enabling unambiguous fault identification using a single ADC channel or comparator threshold network.
Can the ZXLD1374EST20TC operate in Buck mode with input voltage below 8V?
Yes, but with reduced performance: the device starts reliably above 6.5V and functions down to 6.3V, though output current accuracy and regulation may degrade. Below 8V, VSENSE accuracy and switching frequency stability decrease, especially in Buck mode where VAUX bootstrapping is not possible. For robust operation below 8V, use Buck-Boost or Boost topology with appropriate VAUX auxiliary supply.
What is the role of the GI pin in Boost and Buck-Boost configurations?
In Boost and Buck-Boost modes, the GI (Gain Input) pin sets the ratio of switch current to LED current (0.20–0.50) via a resistive divider from ADJ to SGND. This allows optimization of inductor size and efficiency for different LED string voltages. In Buck mode, GI must be tied to ADJ - leaving it floating or misconfigured causes undefined current regulation and potential overcurrent.
ZXLD1374EST20TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 8V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.5A (Switch)
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
ZXLD1374EST20TC FAQ
1.How can I place an order for ZXLD1374EST20TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXLD1374EST20TC 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 ZXLD1374EST20TC reliable?
The price and inventory of ZXLD1374EST20TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1374EST20TC is usually 5 days.
3.What payment methods are accepted for ZXLD1374EST20TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1374EST20TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXLD1374EST20TC?
ZXLD1374EST20TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXLD1374EST20TC 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 ZXLD1374EST20TC?
For technical support, including ZXLD1374EST20TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1374EST20TC requirements.
6.How does Aetrix verify that ZXLD1374EST20TC is sourced from the original manufacturer or authorized distributors?
All ZXLD1374EST20TC 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 ZXLD1374EST20TC meets industry standards.
7.What is the process for return or replacement of ZXLD1374EST20TC?
All ZXLD1374EST20TC units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1374EST20TC, 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 ZXLD1374EST20TC part is unused and in its original packaging.
Return procedure for ZXLD1374EST20TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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