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Diodes Incorporated AZ1085S-ADJTRG1
- Part No.:
- AZ1085S-ADJTRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
AZ1085S-ADJTRG1.pdf
- Description:
- IC REG LINEAR POS ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,634
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Product details
Overview
AZ1085S-ADJTRG1 from BCD Semiconductor Manufacturing Limited is an adjustable 3A low-dropout linear regulator in TO-263-3 package, featuring 1.3V typical dropout at full load, on-chip thermal shutdown, and ±1.2% output voltage accuracy over temperature and load. It delivers stable post-regulation for switching supplies and microprocessor core rails where precision and current capability are critical.
For engineers reviewing the AZ1085S-ADJTRG1 datasheet, AZ1085S-ADJTRG1 pinout, AZ1085S-ADJTRG1 application, or AZ1085S-ADJTRG1 equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and regulation specs, and real-world use cases in telecom power and embedded motherboard designs.
Technical Context
The AZ1085S-ADJTRG1 implements a bandgap-referenced error amplifier driving a PNP pass transistor with integrated current limiting and thermal protection circuitry. Its adjustable output is set via two external resistors connected to the ADJ pin, enabling programmable VOUT from 1.25V to 10V.
It operates across 0°C to 125°C junction temperature with 0.1% typical load regulation and 0.015% line regulation, supporting high-stability applications such as DVD player logic supplies and set-top box module rails where ripple rejection (72dB at 120Hz) and long-term stability (0.5% over 1000 hours) are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports high-current digital loads like microprocessor cores without derating at 25°C ambient. |
| Dropout Voltage | 1.3V typical at 3A - enables operation with minimal input–output differential, e.g., 5V input → 3.3V output with 1.7V headroom. |
| Reference Voltage | 1.225V to 1.275V - defines output accuracy baseline; VOUT = VREF × (1 + R2/R1) + IADJ × R2. |
| Line Regulation | 0.015% typical - ensures <±0.5mV output shift per 1V input change, critical for noise-sensitive analog subsystems. |
| Thermal Protection | On-chip shutdown at TJ ≥150°C - prevents permanent damage during overload or poor heatsinking conditions. |
| Adjust Pin Current | 55–120µA - low bias current minimizes resistor-divider power loss and improves output accuracy. |
Pinout & Package
Package: TO-263-3 (D²PAK), surface-mount, thermally enhanced with exposed tab tied to OUTPUT pin. Thermal resistance θJC = 4.15°C/W enables efficient heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Input voltage supply connection | Accepts 2.85V–12V DC; must be decoupled with ≥10µF ceramic capacitor near pin to suppress transients. |
| 2 (OUTPUT) | Regulated output voltage node | Connects to load and output capacitor (≥22µF); tab is electrically tied to this pin for thermal conduction. |
| 3 (ADJ/GND) | Feedback reference and ground reference | For adjustable configuration: connects to resistor divider; internal reference is referenced to this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout operation | 1.3V typical at 3A - allows use in battery-powered or multi-rail systems where input margin is constrained. |
| Integrated protection | Current limit (4.5A) + thermal shutdown - eliminates need for external foldback or thermal sensors in compact designs. |
| Precision reference | 1.225–1.275V bandgap reference - enables ±1.2% output tolerance over temperature and line/load variations. |
| Stable with ceramic output caps | Compatible with ≥22µF X5R/X7R MLCC - reduces board space vs. electrolytic solutions and improves transient response. |
Applications
| Microprocessor Core Supply | Post-Regulation for Switching Supplies |
|---|---|
Use Scenario: Providing clean, low-noise 1.2–3.3V power to ARM Cortex-A series SoCs in industrial gateways. IC Role / Device Role / Timing Role: Final-stage linear regulator delivering tightly regulated voltage after buck converter. Use Value: Suppresses switching ripple (72dB PSRR at 120Hz) and maintains <±10mV output deviation under 100mA–3A load steps. |
Use Scenario: Tightening output of 5V/3A buck converter feeding FPGA I/O banks in telecom baseband cards. IC Role / Device Role / Timing Role: Low-noise LDO post-regulator ensuring stable I/O voltage despite upstream converter ripple and load transients. Use Value: Delivers 0.1% load regulation and <20mV load-step deviation (100mA→3A), meeting FPGA VCCIO spec margins. |
| Battery Charger Reference Rail | Set-Top Box Module Power |
Use Scenario: Generating precise 2.5V reference for Li-ion charger IC feedback loop in portable media players. IC Role / Device Role / Timing Role: Adjustable LDO supplying stable reference voltage to charger controller ADC and DAC circuits. Use Value: 0.5% long-term stability over 1000 hours ensures consistent charge termination accuracy across product lifetime. |
Use Scenario: Powering MPEG decoder ASIC and HDMI PHY in consumer STB mainboard. IC Role / Device Role / Timing Role: Primary 3.3V rail regulator for digital video processing subsystem requiring low RMS noise (<0.003% of VOUT). Use Value: Ultra-low noise performance avoids clock jitter in HDMI link and prevents video artifacts in decoded streams. |
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-3.3#TRPBF | Fixed 3.3V output; 1.5A max; 340mV dropout; higher PSRR (77dB) | Limited to fixed-voltage use; unsuitable for adjustable designs or >1.5A loads | Select only if fixed 3.3V and lower dropout are required, and current demand ≤1.5A. |
| TPS75233QPWPRQ1 | Automotive-grade (AEC-Q100); 3A; 220mV dropout; integrated power-good flag | Requires automotive qualification; adds PG signal but lacks green packaging option | Choose when AEC-Q100 compliance and system-level fault reporting are mandatory. |
Compared with LT1963AEST-3.3#TRPBF and TPS75233QPWPRQ1, the AZ1085S-ADJTRG1 offers adjustable output, RoHS/green compliance, and cost-effective 3A capability in TO-263-3 - making it optimal for non-automotive industrial and consumer power rails where flexibility and thermal robustness are prioritized over ultra-low dropout or automotive certification.
Availability
AZ1085S-ADJTRG1 is available at Aetrix Electronics and suitable for telecom equipment, set-top box modules, and motherboard power supplies requiring stable component supply, green packaging, and tape-and-reel delivery for automated assembly.
Supply support for AZ1085S-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
BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and power IC designer specializing in high-reliability, cost-optimized regulators, MOSFETs, and LED drivers for industrial and consumer markets.
The AZ1085 series targets high-current linear regulation in space-constrained applications, emphasizing thermal robustness, wide input range, and compatibility with standard SMT assembly processes.
FAQ
What is the minimum input–output voltage difference required for regulation?
The AZ1085S-ADJTRG1 maintains regulation with a minimum dropout of 1.3V at 3A (typical) and up to 1.5V (max). Below this differential, output voltage collapses proportionally. For reliable 3.3V output, VIN must remain ≥4.6V under full load.
Can this part be used with ceramic output capacitors?
Yes - the AZ1085S-ADJTRG1 is stable with ≥22µF X5R or X7R ceramic capacitors. This eliminates ESR requirements of older LDOs and reduces footprint versus tantalum or aluminum electrolytics while improving transient response.
How does the ADJ pin function in the feedback network?
The ADJ pin references the internal 1.225–1.275V bandgap. Output voltage is set by VOUT = VREF × (1 + R2/R1) + IADJ × R2, where R1 connects from VOUT to ADJ and R2 from ADJ to GND. IADJ is 55–120µA, so R2 should be ≤10kΩ to limit error.
Is thermal shutdown reversible without power cycling?
Yes - thermal shutdown is fully automatic and self-resetting. Once junction temperature falls below ~140°C (hysteresis ~10°C), regulation resumes without external intervention or power cycle, provided input voltage remains valid.
AZ1085S-ADJTRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- 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
AZ1085S-ADJTRG1 FAQ
1.How can I place an order for AZ1085S-ADJTRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1085S-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 AZ1085S-ADJTRG1 reliable?
The price and inventory of AZ1085S-ADJTRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ1085S-ADJTRG1 is usually 5 days.
3.What payment methods are accepted for AZ1085S-ADJTRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1085S-ADJTRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1085S-ADJTRG1?
AZ1085S-ADJTRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1085S-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 AZ1085S-ADJTRG1?
For technical support, including AZ1085S-ADJTRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1085S-ADJTRG1 requirements.
6.How does Aetrix verify that AZ1085S-ADJTRG1 is sourced from the original manufacturer or authorized distributors?
All AZ1085S-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 AZ1085S-ADJTRG1 meets industry standards.
7.What is the process for return or replacement of AZ1085S-ADJTRG1?
All AZ1085S-ADJTRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1085S-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 AZ1085S-ADJTRG1 part is unused and in its original packaging.
Return procedure for AZ1085S-ADJTRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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