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Diodes Incorporated ZXLD1370QESTTC
- Part No.:
- ZXLD1370QESTTC
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ZXLD1370QESTTC.pdf
- Description:
- LED MV INT SWITCH TSSOP-16EP T&R
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
ZXLD1370Q from Diodes Incorporated is an automotive-grade LED driver controller IC that regulates high-current series LED strings using external NMOS FETs in buck, boost, or buck-boost topologies. It delivers 0.5% typical output current accuracy across 6V–60V input, supports up to 15-series LEDs, and integrates dual dimming (20:1 DC + 1000:1 PWM at 500Hz) for adaptive lighting systems in vehicle headlamps and DRLs.
For engineers reviewing the ZXLD1370Q datasheet, ZXLD1370Q pinout, ZXLD1370Q application, or ZXLD1370Q equivalent, this device requires attention to GI pin configuration for topology selection, TADJ-based thermal derating, STATUS/FLAG fault reporting hierarchy, and VAUX bootstrapping for stable gate drive below 8V input.
Technical Context
The ZXLD1370Q implements a modified hysteretic control architecture with fast and accurate current monitoring paths, enabling precise LED current regulation independent of topology. Its dual-sense architecture uses ISM for primary current feedback and internal error amplification referenced to a 1.25V REF voltage with ±50 ppm/°C drift.
Topology selection is determined by GI pin voltage ratio relative to ADJ (0.20–0.50), while thermal protection is implemented via TADJ-connected thermistor networks that reduce LED current above preset junction temperatures. The STATUS pin provides analog-coded fault identification-4.5V nominal, dropping to 0.9V for overcurrent or 1.8V for overtemperature-enabling diagnostic-aware ECU integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Buck, boost, buck-boost - selectable via GI pin voltage ratio; enables single IC use across diverse LED string voltage requirements. |
| Input Voltage Range | 6V to 60V - supports 12V/24V/48V automotive rails and transient-tolerant operation up to 65V absolute max. |
| Output Current Accuracy | ±0.5% typical - achieved via precision 225mV current sense threshold and low-drift 1.25V reference, critical for consistent luminance in safety-critical lighting. |
| Dimming Capability | 20:1 DC + 1000:1 PWM at 500Hz - enables smooth analog dimming and high-resolution pulse-width control without visible flicker. |
| Switching Frequency | 300–1000 kHz - adjustable via SHP capacitor; higher frequencies allow smaller magnetics but increase switching losses. |
| Thermal Protection | TADJ input with 625mV upper/440mV lower thresholds - enables programmable LED current derating based on heatsink temperature, preventing thermal runaway. |
| Fault Reporting | STATUS (analog-coded voltage levels) + FLAG (open-drain alert) - provides layered diagnostics for ASIL-B compliant system monitoring. |
Pinout & Package
Package: Thermally enhanced TSSOP-16EP with exposed paddle for PCB-level thermal management; RoHS-compliant, halogen-free green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ADJ | DC current setpoint input | 0.125–2.5V control range adjusts LED current from 10% to 200%; clamped to <3V for overvoltage protection. |
| REF | 1.25V reference output | Stable internal reference used for ADJ biasing and external circuit referencing; supplies ≤1mA load current. |
| TADJ | Thermal compensation input | Voltage divider from thermistor network sets LED current reduction threshold; 0.625V triggers derating onset. |
| SHP | Loop compensation node | Connects 100pF capacitor to ground to stabilize hysteretic control loop; determines frequency response and stability margin. |
| STATUS | Analog fault status output | 4.5V nominal during normal operation; drops to 3.6V (undervoltage), 1.8V (overtemperature), or 0.9V (overcurrent) for diagnostics. |
| GATE | External NMOS gate driver | Drives high-side switch with ±300mA peak current; clamped to ≤15V for VAUX >12V; minimum 2.5V below VAUX when VAUX <12V. |
| GI | Topology gain select input | Voltage ratio VGI/VADJ = 0.20–0.50 configures boost/buck-boost mode; tied to ADJ for buck-only operation. |
| ISM | Current sense monitor input | Measures voltage drop across external sense resistor; nominal 225mV threshold ensures accurate current regulation across topologies. |
| PWM | Digital dimming control | Accepts 3.3V/5V logic; >100Hz PWM enables 1000:1 dimming; low for >15ms forces standby mode (90µA quiescent). |
| FLAG | Open-drain fault flag | Active-low signal asserts on any fault condition; complements STATUS for simple interrupt-driven MCU monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% output current accuracy | Enables consistent lumen output across temperature and input voltage variation, eliminating need for post-production calibration in automotive lighting. |
| Multi-topology flexibility (buck/boost/buck-boost) | Reduces BOM count by supporting variable LED string counts (1–16 LEDs) and input rail voltages (6–60V) with one controller IC. |
| Integrated thermal derating via TADJ | Allows direct connection to NTC thermistor on heatsink, enabling real-time LED current reduction before junction temperature exceeds 125°C. |
| Dual-dimming interface (DC + PWM) | Supports both analog brightness trimming and high-frequency digital dimming, meeting OEM requirements for glare-free adaptive driving beams. |
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C operation with PPAP documentation support, satisfying Tier-1 functional safety and traceability requirements. |
Applications
| Automotive Headlamps | Daytime Running Lights (DRL) |
|---|---|
|
Use Scenario: High-brightness LED arrays in projector-based headlamp modules requiring precise current regulation and thermal foldback. IC Role / Device Role / Timing Role: Primary LED current controller managing external high-side NMOS FETs in buck-boost configuration to maintain constant 700mA–1.5A across varying battery voltage (9–16V) and LED forward voltage (20–60V). Use Value: 0.5% current accuracy ensures uniform beam intensity; TADJ-based thermal derating prevents color shift and lumen depreciation during extended high-output operation. |
Use Scenario: Linear LED strings in front-end DRL clusters where compact size, efficiency, and EMI control are critical. IC Role / Device Role / Timing Role: Buck-mode LED controller driving 4–8 series LEDs from 12V rail with 500kHz switching to minimize inductor size and conducted emissions. Use Value: 1000:1 PWM dimming at 500Hz eliminates visible flicker; integrated STATUS/FLAG enables real-time health monitoring for ASIL-A compliance. |
| Commercial Vehicle Lighting | Interior Ambient Lighting |
|
Use Scenario: Heavy-duty truck marker lights and fog lamps operating across wide input ranges (12–48V) and extreme ambient temperatures (-40°C to +85°C). IC Role / Device Role / Timing Role: Boost-mode controller powering 12–16 series LEDs from 12V supply, with VAUX bootstrapping to sustain gate drive during cold-crank conditions (6.3V min). Use Value: 60V rating and AEC-Q100 Grade 1 qualification ensure reliable startup and operation during battery transients; undervoltage lockout prevents erratic behavior below 5.6V. |
Use Scenario: RGBW cabin lighting systems requiring independent channel dimming and thermal management for long-life LED modules. IC Role / Device Role / Timing Role: Buck-boost controller per channel, using ADJ for DC brightness trim and PWM for synchronized color mixing; TADJ monitors local heatsink temperature. Use Value: Dual dimming preserves color point fidelity; thermally adaptive current control extends LED lifetime beyond 15,000 hours in enclosed fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862Q-13 | Fixed-frequency current-mode controller; no TADJ thermal input; 1.5% current accuracy; supports only buck topology. | Limited to fixed-input, fixed-string applications; lacks multi-topology flexibility and analog thermal foldback. | Select when cost sensitivity outweighs thermal adaptability and topology versatility; requires separate thermal monitoring circuitry. |
| LM3423QMH/NOPB | Constant-current buck controller with 1% accuracy; includes integrated MOSFET driver but no boost/buck-boost capability; no STATUS analog fault coding. | Suitable for simpler 12V buck designs; lacks diagnostic granularity and multi-rail compatibility. | Choose for non-automotive industrial lighting where AEC-Q100 and layered fault reporting are not required. |
Compared with AL8862Q-13 and LM3423QMH/NOPB, the ZXLD1370Q uniquely combines multi-topology operation, 0.5% current accuracy, analog-coded fault reporting, and AEC-Q100 Grade 1 qualification-making it the only option capable of replacing multiple discrete controllers in ASIL-B automotive lighting systems.
Availability
ZXLD1370Q is available at Aetrix Electronics and suitable for automotive headlamps, daytime running lights, commercial vehicle lighting, and interior ambient lighting requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for ZXLD1370Q 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.
The ZXLD1370Q belongs to Diodes' automotive LED driver controller product line, designed specifically for high-reliability, thermally adaptive, multi-topology LED lighting in vehicles requiring AEC-Q100 compliance and PPAP documentation.
FAQ
What is the minimum input voltage required for reliable startup of the ZXLD1370Q?
The ZXLD1370Q starts up reliably above 6.5V due to its undervoltage lockout threshold of 5.6V (typical). However, full performance-including specified current accuracy and thermal regulation-is guaranteed only above 8V. Operation between 6.3V and 8V is supported but may exhibit reduced output current stability and requires VAUX bootstrapping in boost/buck-boost modes.
How does the GI pin determine buck vs. boost topology selection?
The GI pin voltage relative to ADJ sets topology: connecting GI directly to ADJ configures buck mode. For boost or buck-boost, GI is biased via a resistive divider from ADJ to SGND to achieve VGI/VADJ ratios of 0.20–0.50. This ratio defines the switch-to-LED current gain, enabling correct duty cycle calculation and current regulation across topologies.
Can the ZXLD1370Q drive LEDs without an external MOSFET?
No-the ZXLD1370Q is a controller IC only and requires an external NMOS power transistor connected to the GATE pin. It does not integrate a power switch. The GATE driver delivers ±300mA peak current to charge/discharge typical gate charges up to 10nC, supporting MOSFETs with RDS(on) down to 5mΩ.
What fault conditions does the STATUS pin distinguish, and how are they encoded?
The STATUS pin outputs distinct analog voltages: 4.5V (normal), 3.6V (VIN undervoltage or out-of-regulation), 1.8V (junction temperature >125°C), or 0.9V (excess sense resistor current >350mV). These levels are prioritized-e.g., overtemperature overrides undervoltage-allowing single-wire diagnostic decoding without additional ADC channels.
ZXLD1370QESTTC 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:
- 1.25V ~ 60V
- Current - Output / Channel:
- 18mA
- Frequency:
- 300kHz ~ 1MHz
- Dimming:
- PWM
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
ZXLD1370QESTTC FAQ
1.How can I place an order for ZXLD1370QESTTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXLD1370QESTTC 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 ZXLD1370QESTTC reliable?
The price and inventory of ZXLD1370QESTTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1370QESTTC is usually 5 days.
3.What payment methods are accepted for ZXLD1370QESTTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1370QESTTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXLD1370QESTTC?
ZXLD1370QESTTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXLD1370QESTTC 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 ZXLD1370QESTTC?
For technical support, including ZXLD1370QESTTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1370QESTTC requirements.
6.How does Aetrix verify that ZXLD1370QESTTC is sourced from the original manufacturer or authorized distributors?
All ZXLD1370QESTTC 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 ZXLD1370QESTTC meets industry standards.
7.What is the process for return or replacement of ZXLD1370QESTTC?
All ZXLD1370QESTTC units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1370QESTTC, 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 ZXLD1370QESTTC part is unused and in its original packaging.
Return procedure for ZXLD1370QESTTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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