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Diodes Incorporated ZXLD1366ET5TA
- Part No.:
- ZXLD1366ET5TA
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
ZXLD1366ET5TA.pdf
- Description:
- IC LED DRVR RGLTR PWM 1A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:25,103
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Product details
Overview
ZXLD1366ET5TA from Diodes Incorporated is a continuous-mode inductive step-down LED driver IC qualified to AEC-Q100 Grade 1, operating from 6V to 60V input and delivering up to 1A output current with ±0.8% accuracy. It uses high-side current sensing via an external resistor (RS) to set nominal LED current and supports DC voltage or PWM dimming on the ADJ pin for brightness control in automotive interior lighting and emergency signage.
For engineers reviewing the ZXLD1366ET5TA datasheet, ZXLD1366ET5TA pinout, ZXLD1366ET5TA application, or ZXLD1366ET5TA equivalent, this device offers verified 1A constant-current regulation, 60V max input tolerance, AEC-Q100 Grade 1 qualification, 97% peak efficiency, and 1000:1 PWM dimming resolution - critical for thermally constrained, safety-critical LED systems.
Technical Context
The ZXLD1366ET5TA implements a self-oscillating buck topology with internal NDMOS switch and high-side current sense amplifier referenced to VIN. Its comparator-based control loop regulates average LED current by comparing VSENSE (developed across RS) against a 200mV threshold derived from the 1.25V internal reference.
Operation relies on hysteresis (±15% of VADJ) to define switching thresholds, enabling stable continuous conduction mode across 1–15 series LEDs. The ADJ pin serves dual functions: analog dimming control (0.3–2.5V), shutdown trigger (<0.2V), and soft-start timing via external capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports wide-range industrial and automotive battery systems including 12V/24V/48V rails with headroom for transients. |
| Max Output Current | 1A - delivers full-rated constant current to single or multi-string LED loads without external current amplification. |
| Current Accuracy | ±0.8% - ensures consistent luminance across units and temperature (-40°C to +125°C), critical for uniform lighting arrays. |
| Dimming Resolution | 1000:1 via PWM on ADJ pin - enables precise low-light control in emergency and signage applications without color shift. |
| Switching Frequency | Up to 625kHz - allows compact magnetics (e.g., 68µH) and reduces EMI filtering requirements in space-constrained designs. |
| Thermal Resistance θJA | 44°C/W (V-DFN3030-6) - enables 1A operation at +125°C ambient when EP is soldered to thermal pad, per AEC-Q100 Grade 1 compliance. |
| AEC-Q100 Grade | Grade 1 (−40°C to +125°C) - validated for under-hood and cabin-mounted automotive LED systems requiring extended temperature reliability. |
Pinout & Package
V-DFN3030-6 package with exposed thermal pad (EP); requires solder connection of EP to PCB ground plane for thermal performance (θJA = 44°C/W). Pin 1 = LX, Pin 2 = GND, Pin 3 = ADJ, Pin 4 = ISENSE, Pin 5 = VIN, Pin 6 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Drain of internal NDMOS switch | Connects to inductor and freewheeling diode; carries pulsed 1A switch current; must be routed with low-inductance layout. |
| GND (Pins 2 & 6) | Power and signal ground reference | Pins 2 and 6 are separate ground terminals - both must be connected to low-impedance ground plane; EP must also connect to GND. |
| ADJ | Multi-function control input | Accepts DC voltage (0.3–2.5V) for analog dimming, PWM for high-res dimming, or ≤0.2V to enter 65µA standby state. |
| ISENSE | High-side current sense input | Connected to RS resistor between VIN and ISENSE; senses 200mV threshold to set IOUT = 0.2V / RS (RS ≥ 0.2Ω). |
| VIN | Main power input | 6–60V supply input; requires local 4.7µF X7R ceramic decoupling capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Inherent open-circuit LED protection | Internal circuitry disables switching if ISENSE detects no current flow - prevents overvoltage damage during LED string failure. |
| Single-pin on/off and dimming | ADJ pin integrates enable, analog dimming, PWM dimming, and soft-start - eliminates need for external logic or gate drivers. |
| Thermally enhanced green package | V-DFN3030-6 with exposed pad achieves θJA = 44°C/W - sustains 1A output at +125°C ambient without heatsink. |
| High efficiency up to 97% | Optimized internal switch RDS(on) ≤ 0.75Ω and low quiescent current (1.6mA active, 65µA off) minimize thermal load in sealed enclosures. |
| Lead-free and halogen-free | Fully RoHS-compliant and "Green" per Diodes Inc. definition (<900ppm Br/Cl, <1000ppm Sb) - meets automotive material restrictions. |
Applications
| Automotive Interior Lighting | Emergency Exit Signage |
|---|---|
|
Use Scenario: Illuminating dashboard backlighting and footwell lighting in passenger vehicles under varying battery voltages (9–16V) and ambient temperatures (−40°C to +85°C). IC Role / Device Role / Timing Role: Constant-current LED driver regulating 350mA–1A through 1–5 series white LEDs; provides AEC-Q100-compliant dimming via vehicle CAN-controlled PWM. Use Value: Maintains consistent luminance across temperature and input voltage drift, eliminating manual calibration and reducing BOM count by integrating dimming control into one pin. |
Use Scenario: Powering red/green LED exit signs in commercial buildings where UL 924 compliance mandates fail-safe illumination during AC mains loss. IC Role / Device Role / Timing Role: Buck LED driver accepting 12–48V DC backup battery input; delivers stable 350mA to parallel LED strings with inherent open-circuit fault detection. Use Value: Prevents catastrophic LED open-circuit overvoltage events and enables >1000:1 dimming for night-mode operation without color shift or flicker. |
| Refrigeration Cabinet Lighting | Industrial SELV Lighting |
|
Use Scenario: Cold-storage lighting in supermarket refrigerated cases where ambient temperature reaches −30°C and humidity induces condensation. IC Role / Device Role / Timing Role: High-efficiency LED driver operating from 24V DC supply; regulates 700mA through 10-series LEDs while maintaining ±0.8% current accuracy at −30°C. Use Value: Eliminates thermal derating concerns via 44°C/W θJA and AEC-Q100 Grade 1 qualification - ensures reliable startup and lumen maintenance in sub-zero environments. |
Use Scenario: Low-voltage (≤60V) industrial task lighting in wet-location machinery enclosures requiring SELV compliance and IP67-rated fixtures. IC Role / Device Role / Timing Role: Isolated-input LED driver accepting 24–60V SELV input; provides galvanically isolated current regulation with built-in short/open LED protection. Use Value: Meets IEC 61347-2-13 safety requirements without external isolation components; simplifies certification by integrating fault protection and thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862SP-13 | Fixed 500kHz switching frequency; no ADJ pin - dimming requires external PWM injection at EN pin; ±2% current accuracy. | Lacks integrated analog dimming and soft-start; requires external RC network for PWM dimming interface. | Choose for cost-sensitive, non-automotive applications where 500kHz fixed frequency simplifies EMI filtering and ±2% accuracy suffices. |
| LM3409QMYX/NOPB | Adjustable frequency (200–1MHz); requires external current-sense amplifier; ±3% current accuracy; no integrated AEC-Q100 qualification. | Needs external op-amp and reference for current sensing; not pre-qualified for automotive temperature range. | Choose when design requires programmable frequency tuning or integration with existing current-sense architecture - but requires full AEC-Q100 requalification effort. |
Compared with AL8862SP-13 and LM3409QMYX/NOPB, the ZXLD1366ET5TA delivers superior current accuracy (±0.8% vs. ±2–3%), integrated AEC-Q100 Grade 1 qualification, and true single-pin dimming/enable/soft-start - reducing component count and validation scope in automotive and safety-critical lighting.
Availability
ZXLD1366ET5TA is available at Aetrix Electronics and suitable for automotive interior lighting, emergency exit signage, refrigeration cabinet lighting, and industrial SELV lighting requiring stable component supply across extended temperature and voltage ranges.
Supply support for ZXLD1366ET5TA 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 manufacturer of discrete semiconductors and ICs, specializing in high-reliability power management, signal integrity, and lighting solutions for automotive, industrial, and consumer markets.
The ZXLD1366 belongs to Diodes' AEC-Q100-qualified LED driver product line, engineered specifically for robust, high-accuracy constant-current regulation in thermally demanding automotive and industrial lighting systems.
FAQ
What is the minimum sense resistor value for ZXLD1366ET5TA at 1A output?
The minimum RS value is 0.2Ω when the ADJ pin is floating (VADJ = 1.25V), yielding IOUTnom = 0.2V / 0.2Ω = 1A. Using RS < 0.2Ω risks exceeding the 1.25A absolute maximum LX switch current rating and violates the datasheet's recommended operating condition. Derating is required if ADJ is driven above 1.25V.
How does the ZXLD1366ET5TA achieve open-circuit LED protection?
When the LED string opens, ISENSE sees no voltage drop across RS, causing VSENSE to fall below the 170mV lower hysteresis threshold. This forces the internal comparator to disable the LX switch indefinitely, preventing uncontrolled voltage rise at the LED cathode. No external components are needed - protection is inherent to the current-sense architecture.
Can ZXLD1366ET5TA operate reliably at 60V input with 1A output?
Yes - the device is rated for 60V maximum input and 1A continuous LX current. At 60V input, efficiency remains ≥85% (per Figure 8), and thermal performance is maintained when the V-DFN3030-6 EP is properly soldered to a ≥250mm² copper pour. Junction temperature stays below 150°C at +125°C ambient with proper PCB layout.
What is the purpose of the exposed pad (EP) on the V-DFN3030-6 package?
The EP is electrically connected to the device substrate and must be soldered to the PCB's power ground plane to achieve the specified θJA = 44°C/W. It serves solely as a thermal conduction path - not as a current-carrying ground node. Connecting it to any voltage other than 0V, or leaving it floating, degrades thermal performance and risks device failure under sustained 1A load.
ZXLD1366ET5TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- 65V
- Current - Output / Channel:
- 1A
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Lighting, Signage
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-25
ZXLD1366ET5TA FAQ
1.How can I place an order for ZXLD1366ET5TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXLD1366ET5TA 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 ZXLD1366ET5TA reliable?
The price and inventory of ZXLD1366ET5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1366ET5TA is usually 5 days.
3.What payment methods are accepted for ZXLD1366ET5TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1366ET5TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXLD1366ET5TA?
ZXLD1366ET5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXLD1366ET5TA 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 ZXLD1366ET5TA?
For technical support, including ZXLD1366ET5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1366ET5TA requirements.
6.How does Aetrix verify that ZXLD1366ET5TA is sourced from the original manufacturer or authorized distributors?
All ZXLD1366ET5TA 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 ZXLD1366ET5TA meets industry standards.
7.What is the process for return or replacement of ZXLD1366ET5TA?
All ZXLD1366ET5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1366ET5TA, 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 ZXLD1366ET5TA part is unused and in its original packaging.
Return procedure for ZXLD1366ET5TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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