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Diodes Incorporated ZXLD1352ET5TA
- Part No.:
- ZXLD1352ET5TA
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
ZXLD1352ET5TA.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:10,233
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Product details
Overview
ZXLD1352ET5TA from Diodes Incorporated is a continuous-mode inductive step-down LED driver IC with integrated NDMOS switch and high-side current sensing. It delivers up to 350mA output current across 7–30V input, supports 1000:1 PWM dimming, operates from −40°C to +105°C per AEC-Q100 Grade 2, and targets automotive lighting systems requiring robust thermal performance and precise current regulation.
For engineers reviewing the ZXLD1352ET5TA datasheet, ZXLD1352ET5TA pinout, ZXLD1352ET5TA application, or ZXLD1352ET5TA equivalent, key selection criteria include its TSOT23-5 package, single-pin ADJ-based on/off/dimming control, 100mV current-sense threshold accuracy, 40V transient tolerance, and compatibility with external RS resistor programming for nominal LED current.
Technical Context
The ZXLD1352ET5TA implements a self-oscillating buck topology using internal comparator hysteresis (±15% of VADJ) and fixed 100mV ISENSE threshold referenced to VIN. Its switching frequency ranges from 250kHz (typ.) to 1MHz, with minimum on/off times of 200ns each, enabling stable operation across varying LED forward voltages and input conditions.
Current regulation relies on external RS resistor (IOUTnom = 0.1/RS), while ADJ pin voltage directly modulates the internal reference-floating at 1.25V for nominal output, <0.2V for shutdown, and DC/PWM-driven for linear or logarithmic dimming. The device includes inherent open-circuit LED protection and soft-start via ADJ-to-GND capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7V to 30V - supports wide automotive battery range including cold-crank transients; 40V/0.5s transient rating protects against load-dump spikes. |
| Max Output Current | 350mA - sets upper limit for single or series-connected LEDs; peak LX switch current rated at 370mA. |
| Current Sense Threshold | 100mV ±5mV (measured at ISENSE w.r.t. VIN) - defines ±4% typical output current accuracy with external RS resistor. |
| PWM Dimming Range | 1000:1 - enables fine-grained brightness control from 0.1% to 100% using 100Hz–1kHz PWM applied to ADJ pin. |
| Operating Temperature | −40°C to +105°C ambient - qualified to AEC-Q100 Grade 2, suitable for under-hood and exterior automotive lighting environments. |
| Switching Frequency | 250kHz (typ.) up to 1MHz - adjustable via inductor value and input/output conditions; higher frequencies reduce inductor size but increase switching losses. |
| Quiescent Current (Off) | 20µA (typ.) - achieved by grounding ADJ pin; maintains low system standby power in vehicle sleep modes. |
Pinout & Package
Package: TSOT23-5 - thermally enhanced 5-pin thin shrink small-outline transistor package with exposed pad for improved heat dissipation in space-constrained automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Drain of internal NDMOS switch | Connects to inductor and LED anode; switches between VIN and GND to regulate current; withstands 40V transients. |
| GND | Power and signal ground reference | Return path for LED current, internal regulator, and current sense circuit; must be low-impedance for stability. |
| ADJ | Multi-function control pin | Controls on/off state (≤0.2V), DC dimming (0.3–2.5V), or PWM dimming (100Hz–1kHz); also sets soft-start time with external capacitor. |
| ISENSE | High-side current sense input | Connected to RS resistor between VIN and this pin; senses voltage drop to set average LED current (IOUT = 0.1/RS). |
| VIN | Main power input | Supplies internal regulator and switch; requires ≥1µF X7R ceramic decoupling capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Single-pin brightness & enable control | ADJ pin integrates on/off, DC analog dimming, and PWM dimming-reduces BOM count and simplifies microcontroller interface. |
| High-side current sensing | ISENSE referenced to VIN eliminates need for low-side shunt and preserves common-ground architecture in automotive systems. |
| Inherent open-circuit LED protection | No internal switch overvoltage during LED string open fault-prevents latch-up or destruction without external clamping components. |
| 40V transient capability | Withstands automotive load-dump events up to 40V for 0.5 seconds without derating or external TVS diodes. |
| AEC-Q100 Grade 2 qualification | Validated for operation from −40°C to +105°C ambient-meets reliability requirements for front/rear lighting modules. |
Applications
| Automotive Front Lighting | LED Backup Lamps |
|---|---|
|
Use Scenario: Driving white LED arrays in headlamp position or daytime running light (DRL) modules powered from 12V vehicle battery with load-dump transients. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED string current with 1000:1 PWM dimming synchronized to vehicle CAN bus commands. Use Value: Enables precise luminance control across temperature extremes while maintaining AEC-Q100 compliance and eliminating external current-sense op-amps. |
Use Scenario: Powering red LED strings in rear backup lamps where EMI-sensitive CAN/LIN networks coexist on same PCB. IC Role / Device Role / Timing Role: Low-noise, self-oscillating buck driver with fixed-frequency operation (250kHz) to avoid interference with 250kHz–1MHz communication bands. Use Value: Reduces conducted EMI through optimized LX slew rate and eliminates external oscillator components, easing EMC certification. |
| Low-Voltage Industrial Signage | Halogen Replacement Modules |
|
Use Scenario: Illuminating architectural signage powered from 24V DC industrial supplies with variable ambient temperatures (−25°C to +70°C). IC Role / Device Role / Timing Role: Adjustable-current LED driver supporting both DC voltage dimming (0.3–2.5V) and 1kHz PWM for remote panel control. Use Value: Single ADJ pin replaces dual-control interfaces, reducing wiring complexity and enabling retrofit into legacy 0–10V dimming infrastructure. |
Use Scenario: Replacing 12V halogen bulbs in retail display lighting with warm-white LED strings requiring flicker-free dimming down to 1%. IC Role / Device Role / Timing Role: High-efficiency (95% typ.) buck converter delivering stable 350mA with <±4% current accuracy across input voltage variation. Use Value: Eliminates thermal runaway risk of halogen lamps while matching dimming curve fidelity via 1000:1 PWM range and soft-start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8860T5TR | Successor part from Diodes Inc.; same TSOT23-5 package, 30V input, 350mA output, but adds spread-spectrum frequency modulation and improved thermal shutdown. | Designed for new designs requiring lower EMI and extended junction temperature margin (150°C vs. 150°C, but tighter thermal derating curve). | Select AL8860T5TR for new automotive programs; ZXLD1352ET5TA remains viable for legacy repair or cost-sensitive industrial use where EMI is less constrained. |
| LM3409QMY/NOPB | Texas Instruments part in MSOP-10; supports 6–42V input, 1.5A output, but requires external MOSFET and more external components. | Targets higher-power LED arrays (e.g., fog lamps); lacks integrated switch and single-pin dimming-requires separate enable and dim pins. | Choose LM3409QMY/NOPB only when >350mA output or >30V input is required; ZXLD1352ET5TA offers lower component count and smaller footprint for ≤350mA applications. |
Compared with AL8860T5TR, ZXLD1352ET5TA lacks spread-spectrum EMI reduction and has slightly looser current accuracy (±4% vs. ±3%), but shares identical pinout and basic functionality-making it suitable for cost-sensitive replacements. Compared with LM3409QMY/NOPB, it trades design flexibility for integration density and simplified layout, reducing bill-of-materials and PCB area in compact lighting modules.
Availability
ZXLD1352ET5TA is available at Aetrix Electronics and suitable for automotive lighting, LED backup lamps, and low-voltage industrial signage requiring stable component supply despite its obsolete status-stock is maintained for legacy system support and repair cycles.
Supply support for ZXLD1352ET5TA 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 ZXLD1352 belongs to Diodes' AEC-Q100-qualified LED driver product line, engineered specifically for automotive exterior lighting applications demanding high efficiency, wide input range, and robust transient immunity in harsh thermal environments.
FAQ
Is ZXLD1352ET5TA still in production?
No-Diodes Incorporated officially discontinued ZXLD1352ET5TA and marked it "OBSOLETE" in April 2018, replacing it with AL8860. However, Aetrix Electronics maintains limited legacy stock for repair, maintenance, and end-of-life system support with full traceability and documented lot history.
What is the maximum allowable RS resistor value for 350mA output?
The maximum RS value is 0.286Ω, calculated from IOUTnom = 0.1/RS → RS = 0.1/0.35 = 0.286Ω. The datasheet specifies RS = 0.27Ω as minimum for 370mA, so 0.286Ω yields 350mA nominal with ADJ pin floating at 1.25V. Values above 0.286Ω require ADJ voltage adjustment to maintain target current.
Can ZXLD1352ET5TA drive multiple parallel LED strings?
No-it is designed for single-series LED strings only. Driving parallel strings would cause current imbalance due to forward voltage mismatches, risking thermal runaway. For multi-string applications, use one ZXLD1352ET5TA per string or select a multi-channel driver like AL8861.
Does the ADJ pin require external pull-up or pull-down resistors?
No-ADJ has an internal 50kΩ resistor to VREF (1.25V), so it floats at 1.25V when unconnected. External pull-up/down is unnecessary unless implementing active control (e.g., MCU GPIO or transistor switch). Adding external resistors may distort dimming linearity or disable shutdown functionality.
ZXLD1352ET5TA 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:
- 350mA
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight, Lighting, Signage
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
ZXLD1352ET5TA FAQ
1.How can I place an order for ZXLD1352ET5TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXLD1352ET5TA 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 ZXLD1352ET5TA reliable?
The price and inventory of ZXLD1352ET5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1352ET5TA is usually 5 days.
3.What payment methods are accepted for ZXLD1352ET5TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1352ET5TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXLD1352ET5TA?
ZXLD1352ET5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXLD1352ET5TA 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 ZXLD1352ET5TA?
For technical support, including ZXLD1352ET5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1352ET5TA requirements.
6.How does Aetrix verify that ZXLD1352ET5TA is sourced from the original manufacturer or authorized distributors?
All ZXLD1352ET5TA 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 ZXLD1352ET5TA meets industry standards.
7.What is the process for return or replacement of ZXLD1352ET5TA?
All ZXLD1352ET5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1352ET5TA, 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 ZXLD1352ET5TA part is unused and in its original packaging.
Return procedure for ZXLD1352ET5TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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