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Diodes Incorporated ZXLD1371EST16TC
- Part No.:
- ZXLD1371EST16TC
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ZXLD1371EST16TC.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,383
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Product details
Overview
ZXLD1371EST16TC from Diodes Incorporated is a high-accuracy LED driver controller IC supporting buck, boost, and buck-boost topologies with external MOSFETs. It delivers ±0.25% typical VSENSE accuracy, 5–60V input range, 1A output current capability, and 300–1000kHz programmable switching frequency - enabling stable single- to 16-LED string driving in automotive lighting and industrial signage.
For engineers reviewing the ZXLD1371EST16TC datasheet, ZXLD1371EST16TC pinout, ZXLD1371EST16TC application, or ZXLD1371EST16TC equivalent, key selection criteria include thermal current derating via TADJ, dual dimming (PWM + DC), fault flag/status reporting, and GI pin-configurable topology mode - all critical for robust LED system design under variable input and thermal conditions.
Technical Context
The ZXLD1371 employs a modified hysteretic control scheme with internal 1.25V reference and fixed 218mV (buck) / adjustable sense threshold (boost/buck-boost), enabling precise current regulation independent of duty cycle. Its GI pin sets gain ratio (0.20–0.50) to compensate feedback loop dynamics across topologies.
Thermal protection integrates a dedicated TADJ input accepting thermistor networks to linearly reduce LED current above preset junction temperatures, while STATUS and FLAG pins provide analog voltage and open-drain digital fault signaling respectively - supporting real-time diagnostics without external microcontroller intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5–60V - supports wide-input industrial and automotive supplies; operates down to 5V with reduced performance in buck mode. |
| Output Current Accuracy | ±0.25% typical VSENSE - enables <1% LED brightness variation across units and temperature, critical for display uniformity. |
| Switching Frequency | 300–1000kHz - allows compact magnetics; fixed ~400kHz nominal with programmable range for EMI optimization. |
| Dimming Support | PWM (100–500Hz, 1000:1 ratio) + DC (ADJ pin 0.125–1.25V, 10–100% current) - enables flicker-free analog dimming and high-resolution digital control. |
| Thermal Control | TADJ input with 560–690mV upper threshold - provides linear LED current reduction above user-defined temperature, preventing thermal runaway. |
| Fault Reporting | STATUS pin (4.5V normal, 0.6–2.1V fault-coded analog voltage) + FLAG (open-drain low on fault) - enables multi-level diagnostics without ADC. |
| Junction Temp Range | −40°C to +125°C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive LED headlamp and tail lamp modules. |
Pinout & Package
TSSOP-16EP package with exposed thermal pad (θJC = 23°C/W); requires connection of EP pad to PGND plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ADJ (1) | DC brightness control input | 0.125–1.25V analog voltage sets 10–100% LED current; clamped internally to <3V for overvoltage protection. |
| REF (2) | 1.25V reference output | Provides stable reference for external circuitry; sources 1mA max; used to disable thermal compensation when tied to TADJ. |
| TADJ (3) | Thermal foldback input | Accepts thermistor divider to initiate linear current reduction at user-defined temperature thresholds (560–690mV). |
| SHP (4) | Loop compensation node | Connects 330pF capacitor to ground to stabilize hysteretic control loop; critical for stability across topologies. |
| STATUS (5) | Analog fault status output | 4.5V nominal during operation; drops to specific voltages (e.g., 0.9V for overcurrent, 1.8V for overtemperature) for hardware-based diagnostics. |
| SGND (6) | Signal ground reference | Must be connected to PGND; separates signal return path from high-current power return to minimize noise coupling. |
| PGND (7) | Power ground terminal | High-current return for MOSFET source and sense resistor; tie directly to SGND and maximize copper area for thermal dissipation. |
| GATE (10) | External NMOS gate driver | 11V high-level drive (clamped to 15V at VAUX >12V); delivers ±300mA peak current to switch QG ≤10nC MOSFETs efficiently. |
| VIN (12) | Main supply input | 5–60V input; decoupling capacitor required near pin; UVLO activates below 4.5V (falling) and releases above 4.9V (rising). |
| ISM (13) | Current sense monitor input | Measures voltage drop across external sense resistor; fixed 218mV threshold in buck mode; varies with duty cycle in boost/buck-boost. |
| FLAG (14) | Digital fault indicator | Open-drain output pulled low on fault (overcurrent, stall, UVLO, overtemperature); compatible with 3.3V/5V logic interrupt inputs. |
| PWM (15) | Digital dimming control | Accepts 3.3V/5V logic; >100Hz PWM enables 1000:1 dimming ratio; 15ms low pulse triggers standby mode (ISB-IN = 90–150µA). |
| GI (16) | Topology configuration input | Gain-setting ratio (VGI/VADJ = 0.20–0.50) selects boost/buck-boost mode and adjusts sense threshold for duty-cycle compensation. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-topology flexibility | Single IC supports buck (1–4 LEDs), boost (up to 16 LEDs), and buck-boost (1–16 LEDs) via GI pin configuration - reduces BOM count across lighting platforms. |
| High-precision current regulation | ±0.25% typical VSENSE accuracy ensures consistent LED luminance across temperature (±50ppm/°C ref TC) and unit-to-unit variation. |
| Integrated thermal management | TADJ input enables user-defined thermal foldback without external controller - protects LEDs and driver under high ambient or poor heatsinking conditions. |
| Dual-dimming interface | Simultaneous PWM (1000:1) and DC (10–100%) dimming support allows hybrid control strategies - e.g., coarse DC + fine PWM for smooth low-brightness transitions. |
| Hardware-based fault diagnostics | STATUS analog voltage and FLAG open-drain output provide immediate, microcontroller-free detection of overcurrent, overtemperature, UVLO, and switch stall. |
Applications
| Automotive Exterior Lighting | Industrial Panel Indicators |
|---|---|
|
Use Scenario: LED headlamps and DRLs requiring AEC-Q100 compliance, wide input (9–16V battery), and thermal derating in engine bay environments. IC Role / Device Role / Timing Role: Primary LED current controller managing external high-side NMOS in buck configuration; regulates ILED = 700mA–1.5A with ±0.25% accuracy. Use Value: Eliminates need for external current-sense amplifier and thermal sensor; TADJ-driven foldback prevents LED color shift and premature failure at >105°C junction. |
Use Scenario: High-reliability status indicators on factory HMIs and control panels operating from 12–48V DC industrial supplies. IC Role / Device Role / Timing Role: Constant-current driver in boost topology powering 8–12 white LEDs from 12V rail; uses GI pin to configure gain for stable 350mA output. Use Value: 1000:1 PWM dimming enables seamless brightness matching across operator-visible indicators; STATUS pin simplifies fault logging in PLC-connected systems. |
| Commercial Signage Backlighting | Medical Equipment UI Lighting |
|
Use Scenario: Edge-lit channel letters and architectural signs powered from 24–48V PoE or AC/DC adapters, requiring flicker-free dimming and long life. IC Role / Device Role / Timing Role: Buck-boost controller driving 6–10 LEDs in series from variable input; ADJ pin enables 0–10V analog dimming interface integration. Use Value: Dual dimming support allows OEMs to offer both DALI-compatible (PWM) and 0–10V (DC) versions from same PCB layout; ±0.25% accuracy maintains consistent color point across sign modules. |
Use Scenario: Sterile, low-noise front-panel illumination in diagnostic devices where EMI and reliability are critical (e.g., ultrasound consoles). IC Role / Device Role / Timing Role: Low-noise buck-mode LED driver with 330pF SHP compensation; operates at 500kHz to avoid audible noise and medical band interference. Use Value: FLAG and STATUS outputs feed into safety monitoring circuits; AEC-Q100 qualification ensures proven reliability in mission-critical healthcare applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862SP-13 | Fixed-frequency current-mode controller; no TADJ thermal foldback; 0.5% VSENSE accuracy; supports only buck topology. | Lacks multi-topology and analog thermal control - limited to fixed-input, non-automotive buck LED strings. | Select when cost-sensitive buck-only designs require minimal external components and thermal derating is handled externally. |
| LM3409QMY/NOPB | Adjustable-frequency hysteretic controller; no integrated STATUS analog output; 1.5% VSENSE accuracy; supports buck/boost only. | No built-in thermal foldback or multi-level fault reporting - requires external comparator and ADC for full diagnostics. | Choose for legacy designs already using LM3409 footprint; not recommended for new AEC-Q100 or high-accuracy applications. |
Compared with AL8862SP-13 and LM3409QMY/NOPB, the ZXLD1371EST16TC uniquely combines AEC-Q100 qualification, ±0.25% current accuracy, TADJ-based thermal foldback, and analog STATUS voltage coding - delivering higher system-level reliability and reduced diagnostic component count in automotive and industrial LED systems.
Availability
ZXLD1371EST16TC is available at Aetrix Electronics and suitable for automotive exterior lighting, industrial panel indicators, commercial signage backlighting, and medical equipment UI lighting requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for ZXLD1371EST16TC 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 company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and environmental compliance to RoHS Directive 2011/65/EU.
The ZXLD1371 belongs to Diodes' high-accuracy LED driver controller product line, designed specifically for automotive-grade and industrial LED lighting systems demanding precision current regulation, multi-topology flexibility, and integrated thermal protection.
FAQ
What topology configurations does the ZXLD1371EST16TC support, and how is mode selected?
The ZXLD1371EST16TC supports buck, boost, and buck-boost topologies. Mode is selected via the GI (Gain Input) pin: connect GI to ADJ for buck mode; use a resistive divider from ADJ to SGND with VGI/VADJ ratio of 0.20–0.50 for boost or buck-boost. This ratio also compensates sense voltage for duty-cycle variations in non-buck modes.
How does the TADJ pin implement thermal current derating?
The TADJ pin accepts a thermistor-resistor network that generates a voltage decreasing with rising temperature. When TADJ voltage falls below 560–690mV (upper threshold), the device linearly reduces LED current; at 380–500mV (lower threshold), current drops below 10% of set value. This provides predictable, analog thermal foldback without software.
What are the key differences between the STATUS and FLAG outputs?
STATUS is an analog voltage output (4.5V nominal) that encodes specific fault conditions as distinct voltage levels (e.g., 0.9V for overcurrent, 1.8V for overtemperature), enabling hardware-based diagnosis. FLAG is an open-drain digital output pulled low on any fault condition - ideal for interrupt signaling or simple pass/fail monitoring.
Can the ZXLD1371EST16TC operate below 8V input, and what limitations apply?
Yes - it starts up above 5.4V and functions down to 5.0V, but with reduced performance. In buck mode, efficiency and regulation degrade below 8V; in boost/buck-boost, a bootstrap network on VAUX is recommended for VIN = 5–8V. VAUX must be driven from VIN or auxiliary supply ≥5V, and never powered without VIN present.
ZXLD1371EST16TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 8V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
ZXLD1371EST16TC FAQ
1.How can I place an order for ZXLD1371EST16TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXLD1371EST16TC 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 ZXLD1371EST16TC reliable?
The price and inventory of ZXLD1371EST16TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1371EST16TC is usually 5 days.
3.What payment methods are accepted for ZXLD1371EST16TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1371EST16TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXLD1371EST16TC?
ZXLD1371EST16TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXLD1371EST16TC 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 ZXLD1371EST16TC?
For technical support, including ZXLD1371EST16TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1371EST16TC requirements.
6.How does Aetrix verify that ZXLD1371EST16TC is sourced from the original manufacturer or authorized distributors?
All ZXLD1371EST16TC 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 ZXLD1371EST16TC meets industry standards.
7.What is the process for return or replacement of ZXLD1371EST16TC?
All ZXLD1371EST16TC units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1371EST16TC, 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 ZXLD1371EST16TC part is unused and in its original packaging.
Return procedure for ZXLD1371EST16TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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