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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Diodes Incorporated ZXLD1366QET5TA

Name: ZXLD1366QET5TA
Brand: Diodes Incorporated
SKU: ZXLD1366QET5TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXLD1366QET5TA

Manufacturer:: Diodes Incorporated

Category:: LED Drivers

Package:: SOT-23-5 Thin, TSOT-23-5

Datasheet:: ZXLD1366QET5TA.pdf

Description:: IC LED DRVR RGLTR PWM 1A TSOT25

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Product details

Overview

ZXLD1366QET5TA from Diodes Incorporated is an AEC-Q100 Grade 1 qualified automotive LED driver IC implementing a continuous-mode inductive step-down converter. It delivers up to 1A output current with ±0.8% accuracy, operates from 6V–60V input, and uses high-side current sensing via external resistor RS to set nominal LED current. It supports DC voltage or PWM dimming on the ADJ pin and includes inherent open-circuit LED protection for rear fog lamps and position lighting.

For engineers reviewing the ZXLD1366QET5TA datasheet, ZXLD1366QET5TA pinout, ZXLD1366QET5TA application, or ZXLD1366QET5TA equivalent, key selection criteria include its 1A continuous switch current rating, 200mV current-sense threshold (±15% hysteresis), 625kHz max switching frequency, thermal resistance of 44°C/W in V-DFN3030-6, and AEC-Q100 qualification for automotive lighting systems.

Technical Context

The ZXLD1366QET5TA integrates a self-oscillating buck controller with internal NDMOS switch, using a comparator-based hysteretic control loop referenced to a 1.25V internal bandgap reference. Its ISENSE pin senses voltage drop across an external resistor to regulate average LED current with 200mV nominal threshold and ±15% hysteresis.

Operation relies on ADJ pin voltage modulation: floating at 1.25V enables nominal current; ≤0.2V forces shutdown; 0.3V–2.5V enables linear DC dimming (5:1 range); and PWM applied to ADJ achieves up to 1000:1 dimming resolution. Soft-start is implemented via external capacitor from ADJ to GND.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	6V to 60V - supports wide automotive battery rail variations including cold-crank and load-dump conditions.
Max Output Current	1A continuous - defines maximum LED string current capability without derating under thermal limits in V-DFN3030-6 package.
Current Sense Threshold	200mV ±15% - sets nominal LED current as I_OUT = 0.2V / R_S; hysteresis ensures stable switching boundary.
Switching Frequency	Up to 625kHz - enables compact magnetics; higher frequencies reduce inductor size but require careful layout for EMI control.
Dimming Control	PWM or DC on ADJ pin - 1000:1 PWM resolution enables precise brightness grading; DC control provides 5:1 analog adjustment range.
Thermal Resistance θ_JA	44°C/W - measured in V-DFN3030-6 package with proper PCB copper pour, enabling 1A operation at +105°C ambient.
AEC-Q100 Grade	Grade 1 (−40°C to +125°C) - qualified for under-hood and exterior lighting applications requiring full automotive reliability.

Pinout & Package

Package: V-DFN3030-6 (3.0mm × 3.0mm, 0.5mm pitch, exposed thermal pad). Thermal resistance θ_JA = 44°C/W; θ_JC = 14°C/W. Exposed pad must be soldered to PCB ground plane for thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
LX	Switch Drain Node	Connects to inductor and freewheeling diode cathode; carries high di/dt switching current; requires low-inductance routing.
GND	Power Ground Reference	Primary return path for sense resistor, regulator, and internal circuitry; separate from exposed pad connection point.
ADJ	Multifunction Control Input	Accepts DC voltage (0.3–2.5V) or PWM signal to adjust LED current; <0.2V disables output; capacitor to GND sets soft-start time.
ISENSE	High-Side Current Sense Input	Connected to RS resistor between VIN and this pin; measures voltage drop to regulate average LED current with 200mV threshold.
VIN	Main Power Input	6V–60V supply input; requires local 4.7µF X7R ceramic decoupling capacitor placed adjacent to pin.
Exposed Pad (EP)	Thermal Interface	Internally connected to substrate; must be soldered to PCB ground plane for thermal conduction-no electrical current path intended.

Key Features

Feature	Design Value
Output Current Accuracy	Typically better than ±0.8% - achieved via precision 200mV current-sense threshold and low-drift 1.25V reference (50ppm/°C).
Single-Pin Dimming Control	ADJ pin supports both DC voltage and PWM inputs - eliminates need for separate enable and dimming lines in space-constrained modules.
Inherent Open-Circuit Protection	No external fault detection circuit required - device automatically disables output if ISENSE detects no current flow, preventing overvoltage stress on LEDs.
Low Quiescent Current in Shutdown	65µA typical - minimizes battery drain in always-on automotive modules such as door courtesy lights during vehicle sleep mode.
Thermally Enhanced Packaging	V-DFN3030-6 with θ_JA = 44°C/W - enables 1A LED drive in compact footprint without heatsink, suitable for tight headlamp or tail lamp PCB layouts.

Applications

Automotive Rear Fog Lamps

Automotive Position Lights

Use Scenario: High-intensity red LED arrays mounted in rear bumper assemblies, activated during low-visibility conditions per UNECE Regulation 38.

IC Role / Device Role / Timing Role: Constant-current LED driver regulating 1A through 3–5 series-connected red LEDs (V_F ≈ 2.1V each) from 12V/24V battery rail.

Use Value: Maintains luminous intensity within ±5% over temperature (−40°C to +105°C) and input voltage transients (6V–60V), meeting photometric stability requirements.

Use Scenario: White LED strips integrated into vehicle front fenders or side mirrors to indicate vehicle presence during daytime or dusk.

IC Role / Device Role / Timing Role: Buck LED driver delivering 350mA–700mA to parallel LED strings, controlled via PWM from body control module (BCM) for dynamic signature lighting.

Use Value: 1000:1 PWM dimming resolution enables smooth fade-in/fade-out effects while maintaining color consistency across operating conditions.

Automotive Interior Door Lights

Automotive License Plate Illumination

Use Scenario: Ambient LED lighting embedded in door panels that activates upon door opening and dims gradually after closure.

IC Role / Device Role / Timing Role: Low-power constant-current driver operating from 12V battery, using ADJ pin DC voltage control for timed dimming profile.

Use Value: Soft-start via ADJ-to-GND capacitor prevents inrush current spikes; 65µA shutdown current avoids parasitic battery drain during extended parking.

Use Scenario: Compact white LED array mounted behind license plate housing, powered continuously when ignition is active.

IC Role / Device Role / Timing Role: Fixed-current driver supplying 150mA–300mA to 2–4 series LEDs, leveraging inherent open-circuit protection to prevent damage if LED string fails open.

Use Value: Eliminates need for external fault monitoring circuitry, reducing BOM count and board area in cost-sensitive lighting modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL8862Q	Successor device with improved efficiency (up to 98%), lower quiescent current (45µA), and enhanced thermal performance (θ_JA = 38°C/W in same V-DFN3030-6 package).	Designed for new automotive designs requiring longer lifecycle support; supports identical pinout and functional interface.	Select AL8862Q for new designs-Diodes explicitly states ZXLD1366Q is not recommended for new designs and cites AL8862Q as replacement.
LM3409QMY/NOPB	Pin-compatible buck LED controller (no integrated switch); requires external MOSFET; 1.25V reference, adjustable 200kHz–1MHz frequency, ±3% current accuracy.	Offers greater flexibility in power stage selection and thermal management but increases component count and design complexity.	Choose LM3409QMY only if system-level thermal constraints or reliability requirements necessitate discrete power switch isolation from controller.

Compared with ZXLD1366QET5TA, AL8862Q offers measurable improvements in efficiency and standby current while maintaining drop-in compatibility, whereas LM3409QMY trades integration for design flexibility-making AL8862Q the preferred upgrade path and LM3409QMY a niche alternative for specialized thermal or failure-mode requirements.

Availability

ZXLD1366QET5TA is available at Aetrix Electronics and suitable for automotive rear fog lamps, interior door lights, and license plate illumination requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZXLD1366QET5TA 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 analog ICs, specializing in high-reliability components for automotive, industrial, and consumer markets with IATF 16949 certified facilities.

The ZXLD1366Q belongs to Diodes' automotive LED driver product line, engineered specifically for AEC-Q100-compliant exterior and interior lighting applications where precision current regulation, wide input range, and robust thermal performance are critical.

FAQ

What is the function of the ADJ pin on the ZXLD1366QET5TA?

The ADJ pin serves three functions: (1) when left floating, it defaults to 1.25V to set nominal LED current; (2) applying ≤0.2V shuts down output and reduces quiescent current to 65µA; (3) applying 0.3V–2.5V enables DC dimming, while PWM signals achieve up to 1000:1 resolution. Its input impedance varies (50kΩ below VREF, 14.2kΩ above), affecting external driver design.

How does the ZXLD1366QET5TA implement open-circuit LED protection?

The device monitors current flow via the ISENSE pin. If no voltage develops across RS (indicating open-circuit LED string), the internal comparator never triggers the switching cycle, leaving LX high and disabling LED current. No external components or fault pins are needed-this behavior is inherent to its hysteretic control architecture and current-sense threshold logic.

Can the ZXLD1366QET5TA operate from a 5V supply?

No. The minimum recommended input voltage is 6V per datasheet Section 6.1. Below 6V, the internal regulator fails to start (startup threshold is 4.85V, but full transistor enhancement requires VIN > 16V for 1A operation). At 5V, the device remains unpowered and non-functional; use a pre-regulator or select a different driver for sub-6V applications.

Why is the ZXLD1366QET5TA not recommended for new designs?

Diodes Incorporated explicitly states "ZXLD1366Q IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AL8862Q" in the datasheet. The AL8862Q offers superior specifications-including higher efficiency (98% vs. 97%), lower shutdown current (45µA vs. 65µA), improved thermal resistance (38°C/W vs. 44°C/W), and continued long-term supply assurance-making it the designated next-generation replacement.

ZXLD1366QET5TA 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:: 60V

Current - Output / Channel:: 1A

Frequency:: 1MHz

Dimming:: PWM

Applications:: Lighting

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-25

ZXLD1366QET5TA FAQ

1.How can I place an order for ZXLD1366QET5TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXLD1366QET5TA 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 ZXLD1366QET5TA reliable?

The price and inventory of ZXLD1366QET5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1366QET5TA is usually 5 days.

3.What payment methods are accepted for ZXLD1366QET5TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1366QET5TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXLD1366QET5TA?

ZXLD1366QET5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXLD1366QET5TA 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 ZXLD1366QET5TA?

For technical support, including ZXLD1366QET5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1366QET5TA requirements.

6.How does Aetrix verify that ZXLD1366QET5TA is sourced from the original manufacturer or authorized distributors?

All ZXLD1366QET5TA 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 ZXLD1366QET5TA meets industry standards.

7.What is the process for return or replacement of ZXLD1366QET5TA?

All ZXLD1366QET5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1366QET5TA, 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 ZXLD1366QET5TA part is unused and in its original packaging.

Return procedure for ZXLD1366QET5TA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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