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Diodes Incorporated ZXLD1356ET5TA
- Part No.:
- ZXLD1356ET5TA
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
ZXLD1356ET5TA.pdf
- Description:
- IC LED DRV RGLTR PWM TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:160,190
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Product details
Overview
ZXLD1356ET5TA from Diodes Incorporated is an AEC-Q100 Grade 1 qualified continuous-mode inductive step-down LED driver IC designed for automotive and industrial lighting systems. It operates from 6V to 60V input, delivers up to 550mA adjustable constant output current with ±0.8% accuracy, and integrates an internal NDMOS switch (RDS(on) = 0.75Ω) and current-sense comparator. It drives series-connected LEDs in headlamps, backup lights, and emergency signage.
For engineers reviewing the ZXLD1356ET5TA datasheet, ZXLD1356ET5TA pinout, ZXLD1356ET5TA application, or ZXLD1356ET5TA equivalent, key selection criteria include its 60V input rating, single-pin PWM/DC dimming via ADJ, inherent open-circuit LED protection, thermal performance in TSOT25 (θJA = 82°C/W), and AEC-Q100 qualification for under-hood operation.
Technical Context
The ZXLD1356ET5TA implements a self-oscillating buck topology using internal hysteresis control: the ISENSE pin senses voltage across an external resistor (RS) to regulate average LED current, while the ADJ pin directly modulates the 200mV current-sense threshold (VSENSE) via DC voltage or PWM. Its comparator-based architecture eliminates need for external oscillator or compensation components.
Operation relies on internal 1.25V reference (VREF) and 50kΩ pull-up to VREF at ADJ, enabling precise current scaling (24–200% of IOUTnom) and shutdown below 0.2V. The LX switch supports 650mA peak current and features built-in overtemperature protection with junction limit of 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports 12V/24V/48V automotive and industrial bus rails without pre-regulation. |
| Max Output Current | 550mA - sets upper bound for single-string LED drive; actual current set by RS = 0.36Ω (IOUTnom = 555mA). |
| Current Accuracy | ±0.8% - ensures consistent luminance across temperature (-40°C to +125°C) and unit-to-unit variation. |
| Dimming Control | PWM resolution up to 1000:1 - enables high-fidelity brightness control using ADJ pin without external FET. |
| Switch RDS(on) | 0.75Ω typical - determines conduction loss and thermal dissipation at full load (PLOSS ≈ 230mW @ 550mA). |
| Thermal Resistance θJA | 82°C/W (TSOT25) - defines maximum power derating in standard PCB layout; requires thermal pad grounding per datasheet. |
| AEC-Q100 Grade | Grade 1 - certified for ambient operation from -40°C to +125°C, qualifying for engine compartment and exterior lighting. |
Pinout & Package
Package: TSOT25 (5-pin thin shrink small outline transistor), thermally enhanced with exposed pad connected to GND for improved heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Switch Drain Node | Connects to inductor and freewheeling diode anode; carries pulsed 550mA current and must be routed with low-inductance layout. |
| GND | Power Ground Reference | Primary return path for sense resistor, internal regulator, and LX switch; requires low-impedance connection to thermal pad. |
| ADJ | Multi-function Control Input | Accepts DC voltage (0.3–2.5V) for analog dimming or PWM signal for digital dimming; also serves as enable/disable pin (≤0.2V = off). |
| ISENSE | Current Sense Input | Monitors voltage drop across external RS resistor (VIN–ISENSE); sets nominal LED current via IOUTnom = 0.2V / RS. |
| VIN | Power Input Supply | Accepts 6–60V unregulated input; requires ≥4.7µF X7R ceramic decoupling capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Inherent open-circuit LED protection | Automatically disables switching if ISENSE detects no current flow-no external fault detection circuitry required. |
| Single-pin on/off and dimming | Eliminates need for separate EN and DIM pins; reduces BOM count and simplifies microcontroller GPIO usage. |
| High efficiency up to 97% | Minimizes thermal load in enclosed fixtures; achieved via low RDS(on), optimized gate drive, and synchronous-free architecture. |
| Externally adjustable soft-start | Capacitor from ADJ to GND sets startup time (~0.2ms/nF), preventing inrush current into LED string and input capacitors. |
| Green packaging | Halogen- and antimony-free molding compound with lead-free finish meets RoHS 2 and automotive environmental compliance requirements. |
Applications
| Automotive Headlamps | LED Backup Lighting |
|---|---|
|
Use Scenario: Driving 3–7 white LEDs in 24V commercial vehicle headlamp modules requiring stable light output across battery voltage swing (10–32V). IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED string current independent of forward voltage drift and temperature. Use Value: Maintains ±0.8% current accuracy over -40°C to +125°C ambient, ensuring consistent photometric output without closed-loop optical feedback. |
Use Scenario: Powering rear LED arrays in passenger cars and trucks where EMI-sensitive CAN bus coexists with high-current lighting loads. IC Role / Device Role / Timing Role: Self-oscillating buck converter with fixed-frequency operation (360kHz typical) minimizing conducted EMI during PWM dimming. Use Value: Eliminates external clock source and compensation network, reducing board area and system-level EMI filtering complexity. |
| Emergency Exit Signs | Refrigeration Cabinet Lighting |
|
Use Scenario: Battery-backed LED illumination in UL 924-compliant exit signs operating from 12V sealed lead-acid or LiFePO4 packs. IC Role / Device Role / Timing Role: High-input-voltage LED driver supporting wide VIN range (6–60V) to accommodate battery charge/discharge profiles. Use Value: Enables direct connection to 12V/24V battery without intermediate DC-DC stage, improving system efficiency and reliability during brownout conditions. |
Use Scenario: Cold-storage lighting in supermarket refrigerated cases where condensation and thermal cycling challenge component longevity. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualified driver ensuring functional stability at -40°C startup and sustained operation at +125°C junction temperature. Use Value: Guarantees uninterrupted illumination during defrost cycles and ambient temperature transients without current droop or latch-up. |
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 | Higher max input (65V), lower quiescent current (40µA), but no AEC-Q100 qualification and only 350mA max output. | Suitable for industrial signage but not automotive under-hood use due to lack of Grade 1 qualification. | Select when cost-sensitive non-automotive designs require ultra-low standby power and higher VIN margin. |
| LM3409QMY/NOPB | Requires external MOSFET, supports higher current (1.5A), includes thermal foldback, but needs compensation network and has larger solution size. | Better for high-power LED arrays (>1W per string); less integrated than ZXLD1356ET5TA for compact modules. | Choose when scalability beyond 550mA or programmable thermal protection is required, accepting added design complexity. |
Compared with AL8862SP-13 and LM3409QMY/NOPB, the ZXLD1356ET5TA offers best-in-class integration for space-constrained AEC-Q100 Grade 1 applications-combining internal switch, single-pin dimming, open-circuit protection, and 550mA capability in a 5-pin TSOT25 package without external compensation.
Availability
ZXLD1356ET5TA is available at Aetrix Electronics and suitable for automotive lighting, emergency signage, and refrigeration cabinet illumination requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ZXLD1356ET5TA 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets, with emphasis on high-reliability and AEC-Q100-qualified products.
The ZXLD1356 product line targets cost-sensitive, thermally constrained LED lighting applications requiring robustness in harsh environments-designed specifically for automotive exterior lighting and industrial safety-critical illumination.
FAQ
What is the minimum sense resistor value for ZXLD1356ET5TA?
The minimum recommended sense resistor is 0.36Ω when the ADJ pin is floating, yielding a nominal output current of 555mA. Using a smaller RS risks exceeding the 550mA absolute maximum continuous LX current rating and may cause thermal overload or reduced reliability. Derating is required below 16V input to maintain safe junction temperature.
Can ZXLD1356ET5TA drive multiple parallel LED strings?
No-it is designed exclusively for single-series LED strings. Driving parallel strings would cause current imbalance due to VF mismatch, leading to thermal runaway and premature failure. For multi-string applications, separate ZXLD1356ET5TA channels or a matrix-driver IC must be used.
How does the ADJ pin function during PWM dimming?
When a PWM signal (0.3–2.5V amplitude, <300Hz) is applied to ADJ, the internal low-pass filter converts it to an equivalent DC voltage that scales the 200mV current-sense threshold proportionally. This achieves smooth, flicker-free dimming with up to 1000:1 contrast ratio without affecting switching frequency or efficiency.
Is thermal pad connection mandatory for ZXLD1356ET5TA in TSOT25?
Yes-the exposed thermal pad must be soldered to a solid GND copper pour to achieve the specified θJA = 82°C/W. Leaving it floating increases junction temperature by >25°C at full load, risking thermal shutdown or accelerated parametric drift. It must not be connected to any voltage other than 0V.
ZXLD1356ET5TA 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:
- 550mA
- Frequency:
- 500kHz
- 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
ZXLD1356ET5TA FAQ
1.How can I place an order for ZXLD1356ET5TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXLD1356ET5TA 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 ZXLD1356ET5TA reliable?
The price and inventory of ZXLD1356ET5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1356ET5TA is usually 5 days.
3.What payment methods are accepted for ZXLD1356ET5TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1356ET5TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXLD1356ET5TA?
ZXLD1356ET5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXLD1356ET5TA 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 ZXLD1356ET5TA?
For technical support, including ZXLD1356ET5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1356ET5TA requirements.
6.How does Aetrix verify that ZXLD1356ET5TA is sourced from the original manufacturer or authorized distributors?
All ZXLD1356ET5TA 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 ZXLD1356ET5TA meets industry standards.
7.What is the process for return or replacement of ZXLD1356ET5TA?
All ZXLD1356ET5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1356ET5TA, 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 ZXLD1356ET5TA part is unused and in its original packaging.
Return procedure for ZXLD1356ET5TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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