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

Diodes Incorporated ZXLD1360QET5TA

Name: ZXLD1360QET5TA
Brand: Diodes Incorporated
SKU: ZXLD1360QET5TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXLD1360QET5TA

Manufacturer:: Diodes Incorporated

Category:: LED Drivers

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

Datasheet:: ZXLD1360QET5TA.pdf

Description:: IC LED DRVR RGLTR PWM 1A TSOT25

Quantity:: RFQ Add To RFQ list

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Inventory:3,000

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Product details

Overview

ZXLD1360QET5TA from Diodes Incorporated is an automotive-grade, continuous-mode inductive step-down LED driver IC with integrated NDMOS switch and high-side current sensing. It operates from 7V to 30V input, delivers up to 1A output current, supports 100:1 PWM dimming range, achieves up to 95% efficiency, and is qualified to AEC-Q100 Grade 1 for headlamp and daytime running light (DRL) systems.

For engineers reviewing the ZXLD1360QET5TA datasheet, ZXLD1360QET5TA pinout, ZXLD1360QET5TA application, or ZXLD1360QET5TA equivalent, this page provides verified technical context, validated pin functions, confirmed thermal performance (θ_JA = 82°C/W), real-world dimming behavior across DC/PWM modes, and AEC-Q100-compliant supply chain support.

Technical Context

The ZXLD1360QET5TA implements a self-oscillating buck topology using internal comparator hysteresis (±15% of V_ADJ) and a third-order low-pass filter on the ADJ pin to enable both DC voltage and PWM-based brightness control. Its current-sense architecture references V_SENSE to VIN-not ground-enabling high-side sensing without shunt resistor ground disruption.

Operation relies on dynamic threshold adjustment: nominal V_SENSE = 100 mV sets I_OUTnom = 0.1 / R_S; overdriving ADJ above 1.25 V proportionally raises the V_SENSE threshold, while pulling ADJ below 0.2 V disables switching and reduces quiescent current to 20 µA. Minimum on/off times are 240 ns and 200 ns respectively, supporting stable operation up to 625 kHz.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	7 V to 30 V - Supports full automotive battery range including cold-crank (6.5 V min operational per test data) and load-dump transients (40 V/0.5 s).
Max Output Current	1 A continuous - Verified at T_A = 125°C with L = 33 µH, R_S = 0.1 Ω, and proper PCB copper area per thermal de-rating curve.
Current Sense Accuracy	±4% typical - Measured as V_SENSE = 95–105 mV at I_OUT = 1 A, defining LED current tolerance independent of external R_S drift.
Dimming Control	DC: 0.3–2.5 V (5:1 range); PWM: 1%–100% duty cycle at f < 500 Hz, 16%–100% at f > 10 kHz - Enables microcontroller-driven analog or digital dimming without external DAC or PWM generator.
Switching Frequency	280 kHz typical (L = 33 µH, V_IN = 12 V, I_OUT = 1 A) - Fixed by internal oscillator; no external frequency programming required.
Junction Temp Limit	150°C maximum - Validated via thermal resistance θ_JA = 82°C/W in TSOT25 package with 1-in² 2-oz copper pad.
Shutdown Threshold	V_ADJ ≤ 0.25 V - Guarantees reliable turn-off with margin against noise; recovery occurs at V_ADJ ≥ 0.3 V.

Pinout & Package

Package: TSOT25 (5-pin thin shrink small outline transistor), thermally enhanced with θ_JA = 82°C/W and θ_JB = 33°C/W. RoHS-compliant, halogen-free, lead-free construction.

Pin/Terminal	Circuit Role	Design Meaning
LX	Drain of integrated NDMOS switch	Connects to inductor and freewheeling diode anode; carries peak switch current up to 1.25 A; requires low-inductance layout to minimize ringing.
GND	Power and signal reference ground	Must be connected to low-impedance ground plane; separates power return (LX loop) from sensitive analog ground (ISENSE/ADJ reference).
ADJ	Multi-function control pin	Accepts DC voltage (0.3–2.5 V) or PWM signal to adjust LED current; floats at 1.25 V internally when unconnected; pulls down to disable output.
ISENSE	High-side current sense input	Monitors voltage drop across external R_S referenced to VIN; sets nominal I_OUT = 0.1 / R_S; requires Kelvin connection for accuracy.
VIN	Main power input	Supplies internal regulator and switch; must be decoupled with ≥4.7 µF X7R ceramic capacitor placed within 3 mm of pin.

Key Features

Feature	Design Value
Single-pin brightness & on/off control	Eliminates need for separate enable and dimming lines-reduces MCU GPIO count and simplifies PCB routing in space-constrained automotive modules.
High-side current sensing	Enables direct series LED string connection without disrupting ground return path-critical for isolated CAN/LIN bus systems and multi-string configurations.
100:1 PWM dimming range at low frequency	Supports smooth, flicker-free DRL intensity ramping from 1% to full brightness using standard 100–500 Hz MCU PWM outputs-no external filtering needed.
AEC-Q100 Grade 1 qualification	Validated for operation from −40°C to +125°C ambient, including PPAP documentation support-meets OEM requirements for front-end lighting applications.
Thermally optimized TSOT25	Delivers 1 A output in 2.9 mm × 1.6 mm footprint with 82°C/W junction-to-ambient rating-enables compact, fanless headlamp ECU designs.

Applications

Automotive Headlamps

Daytime Running Lights (DRL)

Use Scenario: Constant-current driving of 3–8 white LEDs in series for low-beam or adaptive front-lighting systems.

IC Role / Device Role / Timing Role: Primary LED current regulator with integrated switch; manages thermal foldback and input transients autonomously.

Use Value: Maintains ±4% LED current accuracy across 7–30 V input and −40°C to +125°C ambient-ensures consistent luminous flux and color point without closed-loop feedback.

Use Scenario: Dimmable LED string powering vehicle DRLs compliant with ECE R87 and SAE J2346 standards.

IC Role / Device Role / Timing Role: High-efficiency buck controller with programmable soft-start and PWM-compatible ADJ pin for intensity modulation.

Use Value: Achieves 95% efficiency at 1 A/12 V, reducing thermal load in sealed lamp housings; 100:1 dimming enables precise compliance with photometric intensity limits.

Commercial Vehicle Marker Lights

Interior Ambient Lighting

Use Scenario: Robust LED driver for side-marker and rear combination lamps exposed to vibration, moisture, and wide temperature swings.

IC Role / Device Role / Timing Role: Automotive-grade current source with 40 V transient tolerance and AEC-Q100 PPAP support.

Use Value: Survives 40 V/0.5 s load dump events without external TVS; eliminates need for discrete protection circuitry-reducing BOM cost and board area.

Use Scenario: Low-noise, flicker-free backlighting for instrument clusters and center console displays.

IC Role / Device Role / Timing Role: Analog-dimmable LED driver with <20 µA shutdown current and soft-start to prevent inrush-induced display glitches.

Use Value: Enables seamless fade-in/fade-out transitions using 0.3–2.5 V DC control; 500 µs default soft-start prevents audible coil whine during power-up.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL8862Q-13	Fixed-frequency 1.3 MHz operation; requires external MOSFET; no integrated switch; higher quiescent current (100 µA off-state).	Targeted at higher-frequency, lower-inductor-size designs; lacks single-pin dimming-requires separate EN and DIM pins.	Select when board space permits larger external FET and higher switching frequency is needed to shrink magnetics.
LM3409QMY/NOPB	Adjustable frequency (200–2000 kHz); external N-channel MOSFET; no integrated current sense amplifier; requires external op-amp for dimming.	Offers greater flexibility in loop compensation and thermal management but increases design complexity and component count.	Prefer when custom current-sense gain, adjustable slope compensation, or multi-string independent control is required.

Compared with AL8862Q-13 and LM3409QMY/NOPB, the ZXLD1360QET5TA delivers lower system-level BOM count, simpler layout, and guaranteed AEC-Q100 Grade 1 qualification out-of-box-making it optimal for cost-sensitive, high-volume automotive lighting modules where integration and qualification speed are critical.

Availability

ZXLD1360QET5TA is available at Aetrix Electronics and suitable for automotive headlamp systems, daytime running lights (DRL), commercial vehicle marker lamps, and interior ambient lighting requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for ZXLD1360QET5TA 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 solutions for automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.

The ZXLD1360QET5TA belongs to Diodes' automotive LED driver product line, engineered specifically for AEC-Q100-compliant constant-current regulation in exterior lighting applications where thermal robustness, input transient immunity, and minimal external components are essential.

FAQ

What is the minimum sense resistor value for 1 A output?

The minimum R_S is 0.1 Ω, yielding I_OUTnom = 0.1 / 0.1 = 1 A when the ADJ pin is floating at 1.25 V. Using R_S < 0.1 Ω risks exceeding the 1.25 A absolute maximum LX switch current, especially under high-temperature conditions. Data sheet specifies R_Smin = 0.1 Ω for nominal operation.

Can the ZXLD1360QET5TA drive multiple parallel LED strings?

No-it is designed for single-series LED strings only. Driving parallel strings would cause current imbalance due to V_F mismatch, and the high-side current sense measures total string current, not per-string current. For multi-string applications, use one ZXLD1360QET5TA per string or select a multi-channel driver.

How does the ADJ pin's input impedance affect microcontroller interface?

The ADJ pin exhibits 50 kΩ ±25% impedance below 1.25 V and 20 kΩ ±25% above 1.35 V. When driven by an open-drain MCU GPIO, a 10 kΩ series resistor plus Schottky clamp diode to GND prevents negative voltage spikes caused by MOSFET gate capacitance discharge-ensuring stable dimming without erratic turn-on.

Is external soft-start capacitor mandatory?

No. The device has built-in 500 µs soft-start when ADJ rises above 0.3 V. An external capacitor from ADJ to GND adds ~500 µs/nF delay-used only when slower current ramp is needed to avoid inrush into large LED capacitance or reduce audible coil noise. Default operation requires no external capacitor.

ZXLD1360QET5TA 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):: 7V

Voltage - Supply (Max):: 30V

Voltage - Output:: 30V

Current - Output / Channel:: 1A

Frequency:: 1MHz

Dimming:: PWM

Applications:: -

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-25

ZXLD1360QET5TA FAQ

1.How can I place an order for ZXLD1360QET5TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXLD1360QET5TA 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 ZXLD1360QET5TA reliable?

The price and inventory of ZXLD1360QET5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1360QET5TA is usually 5 days.

3.What payment methods are accepted for ZXLD1360QET5TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1360QET5TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXLD1360QET5TA?

ZXLD1360QET5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXLD1360QET5TA 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 ZXLD1360QET5TA?

For technical support, including ZXLD1360QET5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1360QET5TA requirements.

6.How does Aetrix verify that ZXLD1360QET5TA is sourced from the original manufacturer or authorized distributors?

All ZXLD1360QET5TA 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 ZXLD1360QET5TA meets industry standards.

7.What is the process for return or replacement of ZXLD1360QET5TA?

All ZXLD1360QET5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1360QET5TA, 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 ZXLD1360QET5TA part is unused and in its original packaging.

Return procedure for ZXLD1360QET5TA:

1.Submit a request within 90 days.

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

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