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Diodes Incorporated AZ1085CD-ADJTRG1
- Part No.:
- AZ1085CD-ADJTRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
AZ1085CD-ADJTRG1.pdf
- Description:
- IC REG LINEAR POS ADJ 3A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,486
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Product details
Overview
AZ1085CD-ADJTRG1 from Diodes Incorporated is an adjustable 3A low-dropout linear regulator in TO252-2 (3/4/5) package, delivering stable output voltage with typical dropout of 1.3V at full load and reference voltage of 1.225V–1.275V. It integrates thermal shutdown, current limiting (4.5A), and supports ceramic output capacitors for microprocessor supply and post-regulation in switching power supplies.
For engineers reviewing the AZ1085CD-ADJTRG1 datasheet, AZ1085CD-ADJTRG1 pinout, AZ1085CD-ADJTRG1 application, or AZ1085CD-ADJTRG1 equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and regulation specs, and real-world use cases for high-current LDO selection in industrial and embedded systems.
Technical Context
The AZ1085CD-ADJTRG1 implements a bandgap-referenced error amplifier driving a PNP pass transistor, enabling precise output voltage control via external resistive divider on the ADJ pin. Its internal current limit circuit activates at 4.5A and thermal shutdown engages above +150°C junction temperature.
Designed for operation across 0°C to +125°C junction range, it maintains ±0.2% load regulation (typical) and 0.015% line regulation (typical) under 3A load, with PSRR of 72dB at 120Hz - optimized for noise-sensitive analog and digital supply rails requiring low-output-impedance regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports high-power microprocessor core or FPGA I/O rail without external boost. |
| Dropout Voltage | 1.3V typical at 3A - enables regulation from 5V input to 3.3V output with ≥1.7V headroom. |
| Reference Voltage | 1.225V–1.275V over temp - sets minimum output voltage (VOUT = VREF × (1 + R2/R1)) with <0.5% long-term stability. |
| Line Regulation | 0.015% typical - ensures <±0.5mV output shift per 1V input change at 3A load. |
| Load Regulation | 0.1% typical - guarantees ≤3.3mV output deviation from 0 to 3A load at fixed input. |
| Thermal Resistance θJA | 100°C/W (TO252-2) - requires ≤2.5W max power dissipation to stay below +125°C junction at 25°C ambient. |
| PSRR | 72dB at 120Hz - suppresses ripple from upstream switching converters feeding its input. |
Pinout & Package
Package: TO252-2 (3-pin variant, lead-free, RoHS-compliant "Green" compound). Tab is electrically connected to OUTPUT pin and serves as primary heat path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Input voltage supply terminal | Accepts 2.85V–12V input; must be decoupled with ≥10µF low-ESR capacitor near pin. |
| 2 (OUTPUT) | Regulated output and thermal tab connection | Delivers adjustable output; tab soldering to PCB copper enhances thermal performance by up to 30%. |
| 3 (ADJ/GND) | Feedback reference node | Connects to resistor divider; draws 55–120µA - impacts accuracy if divider resistance >10kΩ. |
Key Features
| Feature | Design Value |
|---|---|
| Low ESR capacitor compatibility | Stable with ≥10µF ceramic output cap - eliminates need for electrolytic or tantalum, reducing board area and aging risk. |
| Integrated thermal shutdown | Activates at +150°C junction - protects against sustained overload or poor heatsinking without external circuitry. |
| Current limiting | 4.5A foldback limit - prevents catastrophic failure during short-circuit while allowing safe restart after fault clears. |
| Adjustable output | VOUT = 1.25V × (1 + R2/R1) + IADJ×R2 - supports custom voltages from 1.25V to |
| Lead-free & halogen-free | RoHS 3 and "Green" compliant (<900ppm Br/Cl, <1000ppm Sb) - meets global environmental compliance for industrial and telecom deployments. |
Applications
| Microprocessor Core Supply | Battery Charger Post-Regulation |
|---|---|
Use Scenario: Providing clean 1.2V–1.8V supply to ARM Cortex-A series SoCs with dynamic current demand up to 3A. IC Role / Device Role / Timing Role: Primary voltage regulation stage delivering low-noise, fast-transient response power to CPU core logic. Use Value: Maintains <±10mV output tolerance during 0→3A load steps (100µs recovery), preventing logic errors or brownouts. |
Use Scenario: Final-stage regulation after buck converter in Li-ion battery charger IC (e.g., BQ246xx) to ensure precise charge termination voltage. IC Role / Device Role / Timing Role: Precision voltage clamp for CV-phase charging, rejecting switching ripple from upstream DC-DC stage. Use Value: 72dB PSRR at 120Hz reduces charger output ripple to <50µV RMS, improving battery longevity and safety certification margin. |
| Telecom Line Card Power | DVD/STB System Rail |
Use Scenario: Generating +3.3V and +5.0V auxiliary rails on carrier-grade Ethernet line cards operating in -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Secondary LDO for PHY interface, management MCU, and SerDes bias supplies. Use Value: Guaranteed operation to +125°C junction enables derated 3A delivery at 70°C board temp with standard 1oz copper heatsink. |
Use Scenario: Powering DVD laser driver, video DAC, and HDMI transmitter in consumer STB/DVD players with tight EMI limits. IC Role / Device Role / Timing Role: Low-noise analog supply rail isolating sensitive RF and video circuits from digital switching noise. Use Value: 0.003% RMS output noise (10Hz–10kHz) prevents visible banding in analog video output and jitter in HDMI clock recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable 3A LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1963AEST-3.3#TRPBF | Fixed 3.3V output; 1.2V dropout at 3A; higher PSRR (78dB @120Hz); more expensive. | Not adjustable - requires redesign if variable output needed; better for noise-critical analog rails. | Select when fixed 3.3V is acceptable and ultra-low noise is prioritized over flexibility. |
| TLV1117-ADJ | 1A max output; 1.2V dropout at 1A; lower quiescent current (5mA vs 10mA); TO252-3 package. | Insufficient current for 3A loads - suitable only for sub-1A subsystems like sensors or logic rails. | Choose only for cost-sensitive, low-current applications where 3A capability is unnecessary. |
Compared with LT1963AEST-3.3#TRPBF and TLV1117-ADJ, AZ1085CD-ADJTRG1 uniquely balances 3A adjustability, TO252 thermal performance, and cost-effectiveness for mid-power embedded systems - neither fixed-output nor current-limited alternatives match its combination of headroom, flexibility, and ruggedness.
Availability
AZ1085CD-ADJTRG1 is available at Aetrix Electronics and suitable for microprocessor supply, telecom line card power, and DVD/STB system rail applications requiring stable component supply with full RoHS 3 and "Green" compliance.
Supply support for AZ1085CD-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AZ1085C series was designed for high-current, low-noise linear regulation in space-constrained industrial and consumer systems where reliability and thermal robustness are critical.
FAQ
What is the minimum input-to-output voltage required for regulation?
The AZ1085CD-ADJTRG1 requires a minimum headroom of 1.3V (typical) between input and output to maintain regulation at 3A load. At lighter loads, dropout falls to 1.15V. Below this voltage, output collapses proportionally - e.g., with 4.0V input, maximum regulated output is ~2.7V. Always verify worst-case dropout across temperature and current using the datasheet's VDROP vs. IOUT curves.
Can I use ceramic capacitors on input and output?
Yes - the AZ1085CD-ADJTRG1 is explicitly characterized for stability with low-ESR ceramic capacitors: ≥10µF input and ≥22µF output are recommended. Unlike older LDOs, it does not require ESR damping, eliminating the need for aluminum or tantalum capacitors and reducing footprint and lifetime risk.
How does the ADJ pin current affect output accuracy?
The ADJ pin draws 55–120µA, which flows through the bottom resistor (R1) in the feedback divider. If R1 is 1kΩ, this adds ~0.12V offset; at 10kΩ, it contributes ~1.2mV error. For ≤0.5% accuracy, keep R1 ≤ 2.5kΩ and R2 ≤ 25kΩ - verified in the datasheet's load regulation test conditions.
Is AZ1085CD-ADJTRG1 still in active production?
No - Diodes Incorporated has marked the AZ1085C series as OBSOLETE and recommends migration to the AZ1084C family. However, Aetrix Electronics maintains legacy inventory and offers full traceability, extended lifecycle support, and engineering guidance for ongoing production of existing designs using AZ1085CD-ADJTRG1.
AZ1085CD-ADJTRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- 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-252-3
AZ1085CD-ADJTRG1 FAQ
1.How can I place an order for AZ1085CD-ADJTRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1085CD-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 AZ1085CD-ADJTRG1 reliable?
The price and inventory of AZ1085CD-ADJTRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ1085CD-ADJTRG1 is usually 5 days.
3.What payment methods are accepted for AZ1085CD-ADJTRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1085CD-ADJTRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1085CD-ADJTRG1?
AZ1085CD-ADJTRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1085CD-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 AZ1085CD-ADJTRG1?
For technical support, including AZ1085CD-ADJTRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1085CD-ADJTRG1 requirements.
6.How does Aetrix verify that AZ1085CD-ADJTRG1 is sourced from the original manufacturer or authorized distributors?
All AZ1085CD-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 AZ1085CD-ADJTRG1 meets industry standards.
7.What is the process for return or replacement of AZ1085CD-ADJTRG1?
All AZ1085CD-ADJTRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1085CD-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 AZ1085CD-ADJTRG1 part is unused and in its original packaging.
Return procedure for AZ1085CD-ADJTRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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