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Diodes Incorporated AZ1085CS2-ADJTRG1
- Part No.:
- AZ1085CS2-ADJTRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
AZ1085CS2-ADJTRG1.pdf
- Description:
- IC REG LINEAR POS ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,154
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Product details
Overview
AZ1085CS2-ADJTRG1 from Diodes Incorporated is an adjustable 3A low-dropout linear regulator in TO263-2 package, delivering stable output voltage with typical dropout of 1.3V at full load, ±1.25% reference voltage accuracy, and integrated thermal shutdown and current limiting. It serves as a post-regulator for switching supplies and microprocessor core supply in telecom and embedded systems.
For engineers reviewing the AZ1085CS2-ADJTRG1 datasheet, AZ1085CS2-ADJTRG1 pinout, AZ1085CS2-ADJTRG1 application, or AZ1085CS2-ADJTRG1 equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world use cases for high-current analog power rails requiring low-noise, low-ESR ceramic capacitor compatibility.
Technical Context
The AZ1085CS2-ADJTRG1 implements a bandgap-referenced error amplifier driving a PNP pass transistor, enabling precise output regulation via external resistor divider on the ADJ pin. Its architecture supports stable operation with ≥10µF ceramic output capacitors and maintains ≤0.1% load regulation across 0–3A.
It features fixed internal current limit (4.5A) and thermal shutdown activation at +150°C junction temperature, with θJA = 75°C/W in TO263-2 package. The device operates over 0 to +125°C junction range and accepts input voltages up to 12V while sustaining dropout <1.5V at rated current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports high-power analog rails and processor cores without external boost circuitry. |
| Dropout Voltage | 1.3V typical at 3A - enables regulation from 3.8V input to 2.5V output, minimizing power loss in battery-sensitive designs. |
| Reference Voltage | 1.225V to 1.275V - sets output accuracy when using R1/R2 divider; enables ±1.25% VOUT tolerance at 25°C. |
| Line Regulation | 0.015% typical - ensures <1.5mV output change per 10V input variation, critical for precision analog subsystems. |
| Load Regulation | 0.1% typical - guarantees ≤2.5mV shift from no-load to full-load at 2.5V output, supporting stable ADC reference supplies. |
| PSRR | 72dB at 120Hz - suppresses ripple from upstream switching converters, reducing need for additional LC filtering. |
| Quiescent Current | 5–10mA - balances low-noise performance with standby efficiency in always-on industrial modules. |
Pinout & Package
Package: TO263-2 (D²PAK-2), surface-mount, thermally enhanced with exposed tab connected to OUTPUT pin. RoHS-compliant and halogen-free "Green" molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Input voltage supply terminal | Accepts 2.85–12V DC; requires ≥10µF low-ESR ceramic input capacitor for stability. |
| 2 (OUTPUT) | Regulated output and thermal pad connection | Delivers adjustable VOUT; tab must be soldered to large copper pour for θJA = 75°C/W thermal performance. |
| 3 (ADJ/GND) | Feedback reference node | Connects to resistor divider (R1 to GND, R2 between OUTPUT and ADJ); IADJ = 55–120µA introduces <0.3% error at R2 = 150Ω. |
Key Features
| Feature | Design Value |
|---|---|
| Low ESR capacitor compatibility | Stable with ≥10µF ceramic output capacitors - eliminates need for costly tantalum or electrolytic types. |
| Thermal shutdown protection | Activates at +150°C junction temperature and auto-recovers upon cooling - prevents permanent damage during overload or poor heatsinking. |
| Current limiting | Fixed 4.5A foldback limit - protects against short-circuit faults while maintaining safe SOA during transient overloads. |
| Adjustable output range | VOUT = 1.25V × (1 + R2/R1) + IADJ×R2 - supports 1.25V to >10V outputs with standard 1% resistors. |
| RMS output noise | 0.003% of VOUT (10Hz–10kHz) - delivers ultra-low-noise bias for RF front-ends and precision op-amp supplies. |
Applications
| Telecom Power Management | Microprocessor Core Supply |
|---|---|
Use Scenario: Regulating intermediate bus (5V/3.3V) to clean 1.8V/1.2V rails for baseband processors and FPGAs in 4G/5G small cells. IC Role / Device Role / Timing Role: Post-regulator providing low-noise, low-ripple power to sensitive digital logic blocks. Use Value: PSRR >70dB at 120Hz suppresses switching noise from upstream DC/DC converters, preventing bit errors and clock jitter. |
Use Scenario: Delivering stable 1.2V @ 2.5A to ARM Cortex-A series SoCs in industrial gateways. IC Role / Device Role / Timing Role: Primary core voltage regulator with fast transient response (<100µs settling). Use Value: 0.1% load regulation ensures <1.2mV droop under full-core load step, maintaining timing margin integrity. |
| Battery Charger Reference | DVD/STB Analog Subsystem |
Use Scenario: Generating precise 2.5V reference for Li-ion charge controller ICs in portable docking stations. IC Role / Device Role / Timing Role: Precision voltage reference source with <±0.5% long-term stability over 1000 hours. Use Value: 0.5% temperature coefficient and 0.5% long-term drift ensure accurate battery termination voltage across ambient conditions. |
Use Scenario: Powering audio DACs, video decoders, and HDMI PHYs in set-top boxes requiring <10µV RMS noise. IC Role / Device Role / Timing Role: Low-noise analog supply rail generator with dedicated ceramic bypass path. Use Value: 0.003% RMS noise (≈75µV at 2.5V) meets THD requirements for 24-bit audio playback without added filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1963AEST-ADJ#TRPBF | 2.5A max, 340mV dropout at 1.5A, 70dB PSRR, higher quiescent current (1mA) | Limited to 2.5A; insufficient for 3A microprocessor core loads | Select only if lower dropout and higher PSRR outweigh current capacity reduction. |
| TLV1117-ADJ | 800mA max, 1.2V dropout at 800mA, 60dB PSRR, SOT-223 package | Not suitable for >1A loads; lacks thermal robustness for sustained 3A operation | Use only for low-power auxiliary rails where footprint and cost dominate performance needs. |
Compared with LT1963AEST-ADJ#TRPBF and TLV1117-ADJ, AZ1085CS2-ADJTRG1 uniquely delivers 3A continuous current with 1.3V dropout and TO263-2 thermal performance-making it the sole option among these three for high-current, low-noise post-regulation in space-constrained telecom and embedded platforms.
Availability
AZ1085CS2-ADJTRG1 is available at Aetrix Electronics and suitable for telecom equipment, microprocessor power delivery, DVD/STB analog subsystems, and battery charger reference circuits requiring stable component supply despite its obsolete status and recommended replacement path.
Supply support for AZ1085CS2-ADJTRG1 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 analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
AZ1085CS2-ADJTRG1 belongs to the AZ1085C series of high-current LDO regulators designed specifically for post-regulation in multi-rail power architectures where low dropout, thermal resilience, and ceramic capacitor compatibility are mandatory.
FAQ
What is the recommended minimum output capacitor for stable operation?
The AZ1085CS2-ADJTRG1 requires a minimum 10µF ceramic capacitor with ESR ≤100mΩ at the output. Diodes' datasheet confirms stability with X5R/X7R dielectrics; larger values (e.g., 22µF) improve transient response but are not required for basic regulation. Avoid electrolytic or tantalum unless derated for ESR and lifetime.
Can this part replace the obsolete AZ1084C in existing designs?
No-AZ1084C is a 5A LDO with different pinout (TO263-3), higher current rating, and distinct thermal characteristics. AZ1085CS2-ADJTRG1 is not a drop-in replacement. Diodes explicitly recommends AZ1084C for 5A applications; redesign is required to migrate from AZ1084C to AZ1085C due to current and package differences.
How does the ADJ pin current affect output voltage accuracy?
IADJ ranges from 55µA to 120µA and flows through R2 in the feedback divider, adding an offset term (IADJ×R2) to the ideal VREF×(1+R2/R1) equation. At R2 = 150Ω, this contributes up to 18mV error-accounted for in ±1.25% total output tolerance. Use lower R2 values to minimize this effect, but ensure R1 ≤ 1kΩ to limit divider current.
Is thermal pad soldering mandatory for functional operation?
Yes-the exposed tab in TO263-2 is electrically connected to the OUTPUT pin and serves as the primary thermal conduction path. Without soldering the tab to ≥4cm² copper area, θJA degrades from 75°C/W to >120°C/W, causing premature thermal shutdown at <1.5A. IPC-7351B-compliant pad layout is required for rated performance.
AZ1085CS2-ADJTRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 10.5V
- Voltage Dropout (Max):
- 1.5V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 72dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263
AZ1085CS2-ADJTRG1 FAQ
1.How can I place an order for AZ1085CS2-ADJTRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1085CS2-ADJTRG1 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 AZ1085CS2-ADJTRG1 reliable?
The price and inventory of AZ1085CS2-ADJTRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ1085CS2-ADJTRG1 is usually 5 days.
3.What payment methods are accepted for AZ1085CS2-ADJTRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1085CS2-ADJTRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1085CS2-ADJTRG1?
AZ1085CS2-ADJTRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1085CS2-ADJTRG1 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 AZ1085CS2-ADJTRG1?
For technical support, including AZ1085CS2-ADJTRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1085CS2-ADJTRG1 requirements.
6.How does Aetrix verify that AZ1085CS2-ADJTRG1 is sourced from the original manufacturer or authorized distributors?
All AZ1085CS2-ADJTRG1 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 AZ1085CS2-ADJTRG1 meets industry standards.
7.What is the process for return or replacement of AZ1085CS2-ADJTRG1?
All AZ1085CS2-ADJTRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1085CS2-ADJTRG1, 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 AZ1085CS2-ADJTRG1 part is unused and in its original packaging.
Return procedure for AZ1085CS2-ADJTRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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