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Diodes Incorporated ZXLD1350ET5TA
- Part No.:
- ZXLD1350ET5TA
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
ZXLD1350ET5TA.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:15,465
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Product details
Overview
ZXLD1350ET5TA from Diodes Incorporated is a hysteretic-mode inductive step-down LED driver IC with integrated 30V NDMOS switch, high-side current sensing, and AEC-Q100 Grade 2 qualification. It delivers up to 350mA output current across 7–30V input, supports DC/PWM brightness control (100:1 dimming range), and operates from −40°C to +105°C ambient - used in automotive exterior lighting and industrial status indicators.
For engineers reviewing the ZXLD1350ET5TA datasheet, ZXLD1350ET5TA pinout, ZXLD1350ET5TA application, or ZXLD1350ET5TA equivalent, key selection criteria include its internal 2Ω LX switch RDS(on), 100mV current-sense threshold accuracy, 4kHz internal PWM filter, 500µs startup time, and TSOT23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The ZXLD1350ET5TA implements a self-oscillating buck converter architecture using hysteretic control: the comparator compares ISENSE voltage (VIN–VSENSE) against an adjustable ADJ-pin-referenced threshold, with ±15% hysteresis to set switching boundaries. Its internal 200kΩ pull-up to 1.25V reference enables direct DC or open-drain PWM drive on ADJ.
Current regulation relies on external RS (e.g., 0.33Ω → 300mA nominal), where VSENSE = 100mV defines IOUT = 0.1/RS. Shutdown occurs when ADJ < 0.2V, reducing quiescent current to 15µA while retaining VREF bias for fast wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7V to 30V - supports 12V/24V automotive rails and industrial power supplies without pre-regulation. |
| Max Output Current | 350mA - continuous average LED current with thermal derating per θJA = 200°C/W. |
| Current Sense Threshold | 100mV ±5% - sets IOUT = 0.1/RS with typical 4% output accuracy over temperature. |
| Switch RDS(on) | 1.5Ω to 2Ω - limits conduction loss at 350mA; enables >95% peak efficiency with proper L/C selection. |
| Operating Frequency | 250kHz typical - fixed by hysteretic loop dynamics; no external clock required. |
| Dimming Control | PWM (100:1 range at f<500Hz) or DC (0.3–2.5V on ADJ) - eliminates need for external DAC or microcontroller PWM peripherals. |
| Ambient Temp Range | −40°C to +105°C - qualified per AEC-Q100 Grade 2 for under-hood and dashboard lighting. |
Pinout & Package
TSOT23-5 surface-mount package (1.6mm × 2.9mm × 0.9mm), RoHS-compliant, green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Switch drain node | Connects to inductor and LED anode; handles 500mA peak current and 40V transients. |
| GND | Power and signal reference | Must be low-impedance plane; ties internal regulator, comparator, and shutdown circuit grounds. |
| ADJ | Multifunction control input | DC voltage (0.3–2.5V) or PWM signal adjusts output current; <0.2V forces shutdown (15µA IQ). |
| ISENSE | High-side current sense input | Measures voltage drop across external RS (VIN–VSENSE); defines IOUT = 0.1/RS. |
| VIN | Power input | 7–30V supply; requires ≥1µF X7R ceramic decoupling capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 30V NDMOS switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout area in TSOT23-5 footprint. |
| Internal 4kHz PWM filter | Enables direct microcontroller GPIO PWM drive without external RC filtering; supports flicker-free dimming down to 100Hz. |
| Open-circuit LED protection | Prevents LX overvoltage during LED string disconnection - no external clamp diode required. |
| Adjustable soft-start | 0.5ms base delay (500µs to 90% IOUT) extended by 0.5ms/nF via ADJ-to-GND capacitor - prevents inrush current in sensitive systems. |
| 100:1 PWM dimming range | Validated at f<500Hz; maintains color consistency in automotive lighting by avoiding high-frequency modulation artifacts. |
Applications
| Automotive Exterior Lighting | Industrial Panel Indicators |
|---|---|
|
Use Scenario: Driving single or series-connected white LEDs in side marker lamps, license plate lights, or daytime running lights (DRLs) on 12V/24V vehicle platforms. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED string current independent of forward voltage variation and battery voltage sag. Use Value: AEC-Q100 Grade 2 qualification ensures reliability at 105°C ambient; 40V transient tolerance protects against load-dump events. |
Use Scenario: Illuminating status LEDs on PLC I/O modules, HMI panels, and factory automation controllers operating in harsh industrial environments. IC Role / Device Role / Timing Role: High-efficiency LED driver enabling low-power, thermally robust indicator design with minimal external components. Use Value: 95% peak efficiency reduces heat buildup in sealed enclosures; wide input range accommodates unregulated 24VDC supplies. |
| Commercial Signage Backlighting | Medical Device Status Indicators |
|
Use Scenario: Powering edge-lit LED arrays in retail signage, kiosks, and architectural lighting where uniform brightness and dimming fidelity are critical. IC Role / Device Role / Timing Role: Adjustable-current LED driver supporting analog (DC) and digital (PWM) dimming interfaces from host microcontrollers. Use Value: 100:1 dimming range preserves LED chromaticity at low intensities; internal hysteresis minimizes audible coil whine. |
Use Scenario: Providing certified-safe, low-noise LED indication in patient-monitor front panels, infusion pump displays, and diagnostic equipment. IC Role / Device Role / Timing Role: Isolated constant-current source with inherent open-circuit protection - avoids fault propagation to safety-critical subsystems. Use Value: 15µA shutdown current extends battery life in portable medical devices; RoHS/lead-free compliance meets IEC 60601-1 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862SP-13 | Fixed-frequency (1MHz) buck controller; requires external MOSFET; no integrated switch. | Higher switching frequency allows smaller inductors but increases EMI sensitivity; lacks AEC-Q100 qualification. | Select when board space permits external FET and higher-frequency operation is prioritized over qualification and integration. |
| LM3407MMX/NOPB | Constant-current buck controller with 1.25V reference; no internal switch; 0.5A max output. | Requires external N-channel MOSFET and feedback resistor network; wider input range (6–42V) but no automotive qualification. | Choose for non-automotive designs needing higher current or broader VIN, accepting added component count and layout complexity. |
Compared with AL8862SP-13 and LM3407MMX/NOPB, the ZXLD1350ET5TA offers superior integration (no external FET), guaranteed AEC-Q100 compliance, and simpler dimming implementation - making it optimal for cost-sensitive, space-constrained automotive and industrial LED systems.
Availability
ZXLD1350ET5TA is available at Aetrix Electronics and suitable for automotive lighting, industrial HMIs, and medical device indicators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ZXLD1350ET5TA 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 ZXLD1350 belongs to Diodes' AEC-Q100-qualified LED driver product line, engineered specifically for robust, low-component-count constant-current driving of automotive and industrial LED loads.
FAQ
What is the minimum external current sense resistor (RS) value for ZXLD1350ET5TA?
The minimum RS is 0.27Ω when the ADJ pin is floating, yielding 370mA nominal output current while keeping LX switch current below the 500mA absolute maximum rating. Using lower RS values risks exceeding safe operating area limits and requires ADJ pin voltage adjustment to limit IOUT.
Can ZXLD1350ET5TA drive multiple LEDs in series?
Yes - the device supports series-connected LEDs as long as the total forward voltage remains below VIN minus diode and inductor losses. With 30V max input and typical 3.4V per white LED, up to eight LEDs can be driven at 350mA using appropriate inductor and catch diode ratings.
How does the internal PWM filter affect dimming performance?
The third-order 4kHz filter smooths PWM signals applied to the ADJ pin, enabling flicker-free dimming down to 100Hz. At frequencies <500Hz, it produces true on/off LED current modulation (100:1 range); above 10kHz, it yields analog-like current scaling (5:1 range) with reduced ripple and EMI.
Is an input capacitor mandatory for ZXLD1350ET5TA operation?
Yes - a minimum 1µF X7R ceramic capacitor must be placed between VIN and GND, directly adjacent to the IC. This suppresses high-frequency switching noise, sustains peak inductor current, and prevents instability. Y5V dielectrics are explicitly prohibited due to voltage/temperature coefficient drift.
ZXLD1350ET5TA 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:
- -
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
ZXLD1350ET5TA FAQ
1.How can I place an order for ZXLD1350ET5TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXLD1350ET5TA 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 ZXLD1350ET5TA reliable?
The price and inventory of ZXLD1350ET5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1350ET5TA is usually 5 days.
3.What payment methods are accepted for ZXLD1350ET5TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1350ET5TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXLD1350ET5TA?
ZXLD1350ET5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXLD1350ET5TA 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 ZXLD1350ET5TA?
For technical support, including ZXLD1350ET5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1350ET5TA requirements.
6.How does Aetrix verify that ZXLD1350ET5TA is sourced from the original manufacturer or authorized distributors?
All ZXLD1350ET5TA 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 ZXLD1350ET5TA meets industry standards.
7.What is the process for return or replacement of ZXLD1350ET5TA?
All ZXLD1350ET5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1350ET5TA, 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 ZXLD1350ET5TA part is unused and in its original packaging.
Return procedure for ZXLD1350ET5TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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