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Texas Instruments ATL431LIBQDBZRQ1
- Part No.:
- ATL431LIBQDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ATL431LIBQDBZRQ1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:27,966
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Product details
Overview
ATL431LIBQDBZRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) programmable shunt voltage reference IC, delivering 2.5 V nominal reference voltage with 0.5% initial tolerance at 25°C, 27 mV max temperature drift, 0.75 Ω typical dynamic impedance, and sink-current capability up to 15 mA - used in automotive DC/DC converters for precise feedback regulation.
For engineers reviewing the ATL431LIBQDBZRQ1 datasheet, ATL431LIBQDBZRQ1 pinout, ATL431LIBQDBZRQ1 application, or ATL431LIBQDBZRQ1 equivalent, key selection criteria include minimum cathode current (80 µA max), reference input current (0.4 µA max), cathode voltage range (2.5 V to 36 V), and SOT-23 (DBZ) package compatibility with space-constrained automotive power stages.
Technical Context
The ATL431LIBQDBZRQ1 integrates a precision 2.5 V bandgap reference and high-gain transconductance amplifier driving a Darlington output stage, enabling stable shunt regulation without external compensation. Its open-loop gain supports comparator operation, while closed-loop configurations use resistive feedback between CATHODE and REF to set output voltage from Vref to 36 V.
It operates across –40°C to +125°C with guaranteed thermal stability: VI(dev) ≤ 27 mV over full temperature range and ΔVref/ΔVKA ≤ –2.7 mV/V. The device achieves low quiescent current via optimized biasing, with Imin ≤ 80 µA and IREF ≤ 0.4 µA - critical for low-power automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 2.500 V ±0.5% at 25°C - enables accurate feedback sensing in isolated flyback or buck-boost converters |
| Temp Drift (VI(dev)) | ≤27 mV over –40°C to +125°C - ensures <±0.1% output variation in engine bay environments |
| Dynamic Impedance (|ZKA|) | 0.75 Ω typical - minimizes load-induced voltage deviation during transient current steps |
| Min Cathode Current (Imin) | 80 µA max - allows regulation down to ultra-low standby currents in always-on modules |
| Ref Input Current (IREF) | 0.4 µA max - reduces resistor-divider error and power loss in high-impedance feedback networks |
| Cathode Voltage Range (VKA) | 2.5 V to 36 V - supports direct regulation of 12 V/24 V automotive rails and auxiliary supplies |
| Sink Current (IKA) | 15 mA max - drives optocoupler LEDs or error amplifier inputs without external buffering |
Pinout & Package
ATL431LIBQDBZRQ1 is housed in a 3-pin SOT-23 (DBZ) package measuring 2.90 mm × 1.30 mm, optimized for automated placement and thermal performance in high-density automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Current Sink Output | Primary shunt path; connects to feedback node or optocoupler anode; must sustain ≥80 µA for regulation |
| REF (Pin 2) | Reference Input | Senses divided output voltage; requires ≤0.4 µA bias current; floating connection disables regulation |
| ANODE (Pin 3) | Common Return | Typically tied to system ground or low-side return; serves as voltage reference point for all internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive powertrain and body electronics requirements |
| 0.5% initial VREF tolerance (B grade) | Reduces calibration overhead in factory programming and improves closed-loop accuracy without trimming |
| 0.75 Ω dynamic impedance | Enables fast transient response in switching regulators - limits output voltage droop under 10 mA step loads |
| 80 µA max Imin | Supports >95% efficiency in light-load conditions for EV on-board chargers and ADAS domain controllers |
| No external compensation required | Internally compensated for stability with 0–10 nF capacitive loads - simplifies layout and eliminates loop-tuning iterations |
Applications
| DC/DC Converter Feedback | Automotive LED Lighting Control |
|---|---|
Use Scenario: Precision voltage feedback in isolated flyback converters powering infotainment systems. IC Role / Device Role / Timing Role: Shunt regulator providing adjustable reference to optocoupler-based secondary-side regulation loop. Use Value: 0.5% VREF tolerance and 27 mV temp drift maintain ±1.2% output accuracy across vehicle lifetime and temperature extremes. | Use Scenario: Constant-current sink for adaptive front lighting (AFS) LED arrays in headlamp modules. IC Role / Device Role / Timing Role: Reference-controlled current mirror driver regulating LED string current independent of supply rail fluctuations. Use Value: 80 µA Imin and 0.4 µA IREF enable stable dimming control down to 1% brightness without dropout or flicker. |
| On-Board Charger (OBC) Monitoring | Motor Inverter Gate Drive Bias |
Use Scenario: Overvoltage protection and bus voltage monitoring in 6.6 kW bidirectional OBCs. IC Role / Device Role / Timing Role: Comparator with integrated reference detecting DC-link overvoltage events above 400 V threshold. Use Value: High open-loop gain and sharp turn-on characteristic trigger protection within <1 µs - prevents IGBT desaturation damage. | Use Scenario: Isolated gate drive voltage clamping for SiC MOSFET half-bridges in traction inverters. IC Role / Device Role / Timing Role: Shunt clamp limiting bootstrap capacitor voltage to safe levels during high-dV/dt switching transitions. Use Value: 36 V VKA rating and 15 mA IKA support robust clamping of 15 V gate drivers under 100 V/ns noise coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431LIBQDBZRQ1 | Same pinout, identical electrical specs except higher Imin (100 µA max) and wider VREF tolerance (1.0% for A grade) | Limited to non-critical feedback loops where 0.5% accuracy is not required | Select when cost sensitivity outweighs precision needs and thermal drift budget allows >35 mV deviation |
| ATL432LIBQDBZRQ1 | Identical functionality and specs but reversed REF/CATHODE pinout (Pin 1 = REF, Pin 2 = CATHODE) in same DBZ package | Requires PCB layout revision; incompatible with existing ATL431LI footprints | Choose only for new designs needing pin-compatible upgrade path to dual-reference variants or enhanced EMI immunity |
Compared with TL431LIBQDBZRQ1, ATL431LIBQDBZRQ1 delivers tighter initial tolerance and lower minimum operating current - improving light-load efficiency and closed-loop accuracy. Against ATL432LIBQDBZRQ1, it offers drop-in replacement capability without layout changes, preserving design reuse and validation effort.
Availability
ATL431LIBQDBZRQ1 is available at Aetrix Electronics and suitable for automotive DC/DC converters, on-board chargers, and LED lighting systems requiring stable component supply under AEC-Q100 compliance and extended temperature operation.
Supply support for ATL431LIBQDBZRQ1 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in automotive-grade power management and signal conditioning solutions.
The ATL43xLI-Q1 product line delivers high-accuracy, low-IQ shunt references designed specifically for safety-critical automotive power conversion, battery management, and lighting control applications.
FAQ
What is the maximum cathode voltage rating for ATL431LIBQDBZRQ1?
The ATL431LIBQDBZRQ1 has an absolute maximum cathode-to-anode voltage (VKA) rating of 37 V, with recommended operation from VREF (2.5 V) up to 36 V. Exceeding 37 V risks permanent damage. This rating enables direct use in 24 V automotive systems and auxiliary 36 V rails without external clamping - a key advantage over standard Zener diodes.
Does ATL431LIBQDBZRQ1 require an external capacitor for stability?
No, ATL431LIBQDBZRQ1 is internally compensated and remains stable without an output capacitor between CATHODE and ANODE. It supports capacitive loads from 0 to 10 nF per Figure 13 of the datasheet. Adding capacitance beyond this range may induce oscillation - verify stability boundaries using the provided test circuits before integrating large bulk or ceramic output caps.
How does the pinout of ATL431LIBQDBZRQ1 differ from ATL432LIBQDBZRQ1?
ATL431LIBQDBZRQ1 uses Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. ATL432LIBQDBZRQ1 swaps REF and CATHODE: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. Both share the same SOT-23 (DBZ) footprint, but the reversal makes them non-interchangeable without PCB modification - always confirm pin mapping before board assembly.
What is the minimum cathode current needed for regulation in ATL431LIBQDBZRQ1?
The ATL431LIBQDBZRQ1 requires a minimum cathode current (Imin) of no more than 80 µA to maintain regulation - verified across –40°C to +125°C. Below this threshold, the internal amplifier exits linear region and reference accuracy degrades. Design feedback networks to guarantee ≥100 µA worst-case IKA, including temperature and tolerance margins.
Can ATL431LIBQDBZRQ1 be used as a comparator?
Yes, ATL431LIBQDBZRQ1 functions as a high-gain comparator with integrated 2.5 V reference when operated open-loop. Apply input voltage to the REF pin and monitor CATHODE output: it sinks current when REF exceeds VREF, producing a rail-to-rail logic-compatible output. For reliable switching, ensure ≥10% overdrive (e.g., >2.75 V for B-grade) and ≥500 µA cathode current to maintain speed and noise immunity.
ATL431LIBQDBZRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ATL431LIBQDBZRQ1 FAQ
1.How can I place an order for ATL431LIBQDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ATL431LIBQDBZRQ1 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 ATL431LIBQDBZRQ1 reliable?
The price and inventory of ATL431LIBQDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATL431LIBQDBZRQ1 is usually 5 days.
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Once your ATL431LIBQDBZRQ1 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 ATL431LIBQDBZRQ1?
For technical support, including ATL431LIBQDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATL431LIBQDBZRQ1 requirements.
6.How does Aetrix verify that ATL431LIBQDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All ATL431LIBQDBZRQ1 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 ATL431LIBQDBZRQ1 meets industry standards.
7.What is the process for return or replacement of ATL431LIBQDBZRQ1?
All ATL431LIBQDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ATL431LIBQDBZRQ1, 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 ATL431LIBQDBZRQ1 part is unused and in its original packaging.
Return procedure for ATL431LIBQDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATL431LIBQDBZRQ1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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