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Texas Instruments ATL432LIAQDBZRQ1
- Part No.:
- ATL432LIAQDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ATL432LIAQDBZRQ1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,095
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Product details
Overview
ATL432LIAQDBZRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) automotive-grade programmable shunt regulator with 0.5% initial reference voltage tolerance at 25°C, 2.5 V minimum output voltage, adjustable up to 36 V, and 0.65 Ω typical dynamic impedance. It serves as a precision voltage reference and error amplifier in feedback loops for DC/DC converters and onboard chargers.
For engineers reviewing the ATL432LIAQDBZRQ1 datasheet, ATL432LIAQDBZRQ1 pinout, ATL432LIAQDBZRQ1 application, or ATL432LIAQDBZRQ1 equivalent, key selection considerations include its DBZ (SOT-23) pinout distinction from ATL431LI-Q1, low 65 µA minimum cathode current, 0.4 µA max reference input current, and ±27 mV temperature drift over full operating range.
Technical Context
The ATL432LIAQDBZRQ1 implements a three-terminal shunt architecture with an internal 2.5 V bandgap reference and high-gain op-amp driving a Darlington sink output stage. Its closed-loop operation enables precise voltage regulation via external resistor dividers between cathode and reference pins.
It operates in two primary functional modes: open-loop comparator mode (with integrated 2.5 V threshold) and closed-loop shunt regulation mode. The device achieves stability without mandatory output capacitance but provides defined stability boundaries for capacitive loading per Figure 13–16 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF tolerance @ 25°C | ±0.5% (B grade), enabling 12.5 mV absolute accuracy at 2.5 V setting |
| Adjustable VKA range | 2.5 V to 36 V - supports wide-input DC/DC and OBC feedback networks |
| IKA max / min | 15 mA max sink current; 65 µA min cathode current for regulation - reduces standby power |
| Dynamic impedance |ZKA| | 0.65 Ω typical - ensures tight output voltage regulation under load transients |
| VI(dev) over –40°C to +125°C | 27 mV max deviation - guarantees stable reference performance across automotive thermal extremes |
| IREF max | 0.4 µA - minimizes resistor-divider loading error in precision feedback paths |
| Package | SOT-23 (DBZ), 2.90 mm × 1.30 mm - compatible with high-density automotive PCB layouts |
Pinout & Package
SOT-23 (DBZ) package, 3-pin surface-mount, body size 2.90 mm × 1.30 mm, thermal resistance RθJA = 371.7 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 2) | Current sink output / voltage sense node | Primary current path; connects to regulated rail or error amplifier output; voltage referenced to ANODE |
| REF (Pin 1) | Reference input / feedback node | High-impedance input (≤0.4 µA) sensing voltage divider ratio; sets regulated output via R1/R2 |
| ANODE (Pin 3) | Common return / ground reference | System ground connection point; all voltages specified relative to this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation in safety-critical automotive systems |
| Low Imin = 65 µA | Enables ultra-low-power regulation in always-on vehicle subsystems without sacrificing startup reliability |
| 0.65 Ω dynamic impedance | Maintains <±10 mV output deviation during 10 mA load steps - critical for stable SMPS feedback |
| Integrated 2.5 V reference + op-amp | Eliminates need for external precision reference and comparator in voltage monitoring circuits |
| Stable without output capacitor | Reduces BOM count and layout area; optional capacitor use guided by published stability boundaries |
Applications
| On-Board Charger (OBC) Feedback | LED Lighting Current Sink |
|---|---|
Use Scenario: Regulating high-voltage DC bus (200–450 V) in bidirectional OBCs using isolated feedback via optocoupler or digital isolator. IC Role / Device Role / Timing Role: Precision shunt reference and error amplifier in secondary-side feedback loop; compares scaled output voltage against 2.5 V reference. Use Value: 0.5% VREF tolerance and 27 mV temp drift ensure ±0.5% output voltage accuracy across full vehicle thermal profile. |
Use Scenario: Driving high-brightness LED strings in automotive lighting modules requiring constant current with color consistency. IC Role / Device Role / Timing Role: Reference-controlled current sink controller; regulates BJT/MOSFET gate drive based on sense-resistor voltage. Use Value: 65 µA Imin allows operation at microamp-level bias currents, reducing idle power in daytime running light (DRL) modes. |
| Infotainment Power Sequencing | Inverter DC Bus Monitoring |
Use Scenario: Enabling/disabling multiple SoC and display power rails in head units with precise voltage thresholds. IC Role / Device Role / Timing Role: Comparator with integrated 2.5 V reference; triggers enable signals when 5 V or 12 V rails reach regulation. Use Value: Open-loop gain >100 dB and 0.4 µA IREF minimize input loading on resistive dividers - preserving trip-point accuracy. |
Use Scenario: Real-time monitoring of traction inverter DC-link voltage for overvoltage protection and regenerative braking control. IC Role / Device Role / Timing Role: High-bandwidth shunt regulator configured as voltage clamp; sinks fault current during transient overvoltage events. Use Value: 15 mA IKA max and 0.65 Ω ZKA enable fast clamping response (<1 µs) with minimal voltage overshoot beyond 36 V limit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL432LI-Q1 | Same electrical specs and AEC-Q100 Grade 1 rating, but 0.5% VREF tolerance only in B grade; identical DBZ pinout | No functional difference - direct second-source option with identical footprint and performance | Select TL432LI-Q1 when dual-sourcing is required without design change |
| ATL431LIAQDBZRQ1 | Identical specs and qualification, but REF and CATHODE pins swapped in DBZ package (Pin 1 = ANODE, Pin 2 = REF, Pin 3 = CATHODE) | Requires PCB layout revision; not pin-compatible - used where existing ATL431LI-Q1 designs need upgrade path | Choose ATL431LIAQDBZRQ1 only when migrating legacy ATL431LI-Q1 designs and layout modification is acceptable |
Compared with TL432LI-Q1, ATL432LIAQDBZRQ1 offers identical performance and drop-in compatibility; versus ATL431LIAQDBZRQ1, it eliminates board rework by retaining the same DBZ pinout while delivering identical automotive-grade regulation capability.
Availability
ATL432LIAQDBZRQ1 is available at Aetrix Electronics and suitable for automotive on-board chargers, infotainment power sequencing, and inverter DC bus monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ATL432LIAQDBZRQ1 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 ICs.
The ATL43xLI-Q1 product line delivers AEC-Q100 qualified shunt regulators optimized for precision voltage reference, error amplification, and overvoltage protection in electric vehicle power electronics and ADAS subsystems.
FAQ
What is the pin configuration of ATL432LIAQDBZRQ1 in the DBZ package?
The ATL432LIAQDBZRQ1 uses a 3-pin SOT-23 (DBZ) package with Pin 1 = REF, Pin 2 = CATHODE, and Pin 3 = ANODE. This differs from ATL431LI-Q1 (Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE), making them functionally identical but not pin-compatible. Always verify layout against the DBZ top-view diagram in Section 6 of the SNVSBB0A datasheet.
How does ATL432LIAQDBZRQ1 achieve 0.5% reference voltage accuracy?
The ATL432LIAQDBZRQ1 achieves ±0.5% VREF tolerance at 25°C through laser-trimmed bandgap reference circuitry and matched internal transistor pairs. This B-grade accuracy is confirmed in Section 7.5 of the datasheet (VREF = 2487–2512 mV at 1 mA). Temperature drift remains ≤27 mV over –40°C to +125°C, ensuring system-level accuracy in automotive environments.
Can ATL432LIAQDBZRQ1 replace a Zener diode in automotive applications?
Yes - the ATL432LIAQDBZRQ1 is explicitly designed as a precision Zener diode replacement. With sharp turn-on characteristics, 0.65 Ω dynamic impedance, and AEC-Q100 qualification, it outperforms standard Zeners in stability, temperature drift, and current-handling capability. Its 2.5 V to 36 V adjustability also eliminates the need for multiple Zener values in a single design.
What is the minimum cathode current required for regulation in ATL432LIAQDBZRQ1?
The ATL432LIAQDBZRQ1 requires a minimum cathode current (Imin) of 65 µA (typical) to maintain regulation, with a maximum of 80 µA across temperature and process variation. This low Imin enables efficient operation in battery-backed or always-on automotive subsystems where quiescent current must be minimized without sacrificing startup reliability.
Is ATL432LIAQDBZRQ1 stable without an output capacitor?
Yes - the ATL432LIAQDBZRQ1 is internally compensated and stable without an output capacitor between CATHODE and ANODE. However, if external capacitance is added (e.g., for noise filtering), Figure 13 and Figure 15 in the datasheet define safe CL vs. IKA operating regions to avoid oscillation. Stability boundaries depend on both load current and capacitor value.
ATL432LIAQDBZRQ1 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:
- ±1%
- 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
ATL432LIAQDBZRQ1 FAQ
1.How can I place an order for ATL432LIAQDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ATL432LIAQDBZRQ1 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 ATL432LIAQDBZRQ1 reliable?
The price and inventory of ATL432LIAQDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATL432LIAQDBZRQ1 is usually 5 days.
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4.How is shipping managed for ATL432LIAQDBZRQ1?
ATL432LIAQDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATL432LIAQDBZRQ1 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 ATL432LIAQDBZRQ1?
For technical support, including ATL432LIAQDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATL432LIAQDBZRQ1 requirements.
6.How does Aetrix verify that ATL432LIAQDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All ATL432LIAQDBZRQ1 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 ATL432LIAQDBZRQ1 meets industry standards.
7.What is the process for return or replacement of ATL432LIAQDBZRQ1?
All ATL432LIAQDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ATL432LIAQDBZRQ1, 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 ATL432LIAQDBZRQ1 part is unused and in its original packaging.
Return procedure for ATL432LIAQDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATL432LIAQDBZRQ1 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
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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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