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Diodes Incorporated AZ1085CS2-ADJTRE1
- Part No.:
- AZ1085CS2-ADJTRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
AZ1085CS2-ADJTRE1.pdf
- Description:
- IC REG LINEAR POS ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,870
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Product details
Overview
AZ1085CS2-ADJTRE1 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, thermal shutdown protection, and ±1.25% reference voltage accuracy over 0°C to +125°C junction temperature. It supports post-regulation for switching supplies and microprocessor core power in telecom and embedded systems.
For engineers reviewing the AZ1085CS2-ADJTRE1 datasheet, AZ1085CS2-ADJTRE1 pinout, AZ1085CS2-ADJTRE1 application, or AZ1085CS2-ADJTRE1 equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and regulation specs, and real-world application constraints - all derived from Diodes' official DS36735 Rev. 4 documentation.
Technical Context
The AZ1085CS2-ADJTRE1 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 current-limiting circuit triggers at 4.5A and integrates thermal shutdown that activates at +150°C junction temperature.
It operates with input voltages up to 12V and maintains load regulation within 0.1% (typ) and line regulation within 0.015% (typ) across its full 3A output range. The device is optimized for stability with low-ESR ceramic capacitors (≥10µF input, ≥22µF output) and exhibits 72dB PSRR at 120Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports high-current digital loads like microprocessor cores and FPGA I/O banks. |
| Dropout Voltage | 1.3V (typ) at 3A - enables operation with minimal VIN–VOUT headroom, critical for battery-powered or multi-rail systems. |
| Reference Voltage | 1.225V to 1.275V (min/max over temp) - sets output accuracy baseline for adjustable configurations using R1/R2 divider. |
| Thermal Shutdown | Activates at TJ = +150°C - protects die during overload or poor heatsinking; auto-recovers after cooldown. |
| PSRR | 72dB at 120Hz - suppresses ripple from upstream switching regulators, reducing need for additional filtering stages. |
| Quiescent Current | 5–10mA - low bias consumption preserves efficiency in standby or light-load conditions. |
| Adjust Pin Current | 55–120µA - enables use of high-value feedback resistors (e.g., 150Ω/22kΩ), minimizing divider power loss. |
Pinout & Package
Package: TO263-2 (D²PAK-2), surface-mount, thermally enhanced with exposed tab connected to OUTPUT pin. Thermal resistance θJA = 75°C/W, θJC = 6.34°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Input voltage supply connection | Accepts 2.85V–12V input; requires ≥10µF low-ESR ceramic capacitor close to pin for stability. |
| 2 (OUTPUT) | Regulated output voltage node | Delivers adjustable VOUT = VREF × (1 + R2/R1) + IADJ × R2; connects to exposed tab for thermal conduction. |
| 3 (ADJ/GND) | Feedback reference and ground reference | Sets output voltage via external resistor divider; must be bypassed with ≥10nF capacitor if noise-sensitive. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 1.3V typ at 3A - enables 3.3V output from 4.6V input, extending battery runtime in portable designs. |
| Integrated thermal protection | Shuts down at +150°C junction temperature - prevents permanent damage during sustained overload or inadequate PCB copper area. |
| Current limiting | 4.5A foldback limit - limits fault current without latch-up, allowing safe recovery after short-circuit removal. |
| Ceramic capacitor compatible | Stable with ≥10µF input / ≥22µF output ceramic caps - eliminates electrolytic bulk capacitors, improving reliability and footprint. |
| Lead-free & green packaging | RoHS 3 compliant, halogen- and antimony-free - meets environmental requirements for industrial and telecom equipment. |
Applications
| Telecom Power Supply | Microprocessor Core Supply |
|---|---|
Use Scenario: Secondary regulation stage following a 5V buck converter powering baseband processors in 4G/5G small cells. IC Role / Device Role / Timing Role: Adjustable LDO providing clean, low-noise 1.2V core voltage with tight load transient response. Use Value: Maintains <±1% output accuracy under 0–3A dynamic load steps, preventing processor reset or timing violations. |
Use Scenario: Point-of-load regulation for ARM Cortex-A series SoCs requiring programmable core voltage between 0.8V–1.4V. IC Role / Device Role / Timing Role: Precision-adjustable voltage source with 1.25V reference and low IADJ enabling accurate resistor-based scaling. Use Value: Enables fine-grained voltage scaling to optimize power/performance trade-offs without external DAC or controller. |
| Battery Charger Management | Set-Top Box Module Supply |
Use Scenario: Post-regulator for Li-ion charging ICs delivering constant-voltage charge termination at 4.2V. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO isolating sensitive analog charger circuits from noisy DC-DC switching noise. Use Value: Reduces output ripple to <30µV RMS, ensuring accurate voltage sensing and preventing premature charge termination. |
Use Scenario: Powering HDMI PHY, audio codec, and memory interfaces in consumer STB platforms with mixed 1.8V/3.3V/5V rails. IC Role / Device Role / Timing Role: Fixed or adjustable LDO supplying noise-sensitive video/audio subsystems with independent regulation. Use Value: Delivers <0.1% load regulation and 72dB ripple rejection, eliminating visible artifacts and audible noise in playback. |
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 at 1.5A; higher PSRR (78dB @ 120Hz) | Not adjustable; lower current rating - unsuitable for >2A core supplies or variable-VDD designs | Select only when fixed 3.3V output and sub-2A load are sufficient; offers superior noise performance but no flexibility. |
| TPS7A8300RGRT | Adjustable 0.8–3.95V; 3A; 170mV dropout at 3A; integrated soft-start; 65dB PSRR @ 120Hz | Lower dropout and active sequencing features - better for ultra-low-headroom or multi-rail power-up sequences | Prefer when VIN–VOUT margin is <1.2V or when controlled startup timing is required; higher cost and QFN package complexity. |
Compared with LT1963AEST-3.3#TRPBF and TPS7A8300RGRT, the AZ1085CS2-ADJTRE1 delivers higher output current in a thermally robust D²PAK-2 package but trades off dropout voltage and PSRR - making it optimal for cost-sensitive, high-current, moderate-noise applications where board space allows TO263-2 mounting.
Availability
AZ1085CS2-ADJTRE1 is available at Aetrix Electronics and suitable for telecom infrastructure, microprocessor power delivery, battery charger management, and set-top box module supply requiring stable component supply and long-term design-in support.
Supply support for AZ1085CS2-ADJTRE1 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 power management, signal integrity, and protection solutions for industrial, automotive, and consumer markets.
The AZ1085C series belongs to Diodes' high-current LDO portfolio, designed specifically for post-regulation in power-constrained systems where thermal robustness, wide input range, and compatibility with ceramic capacitors are essential.
FAQ
What is the minimum input-to-output voltage differential required for regulation?
The AZ1085CS2-ADJTRE1 maintains regulation with a minimum dropout voltage of 1.3V (typical) at 3A load and 1.5V (max) across temperature. Below this differential, output voltage collapses linearly with input reduction. For reliable operation, maintain VIN ≥ VOUT + 1.5V under worst-case conditions including temperature and load transients.
Can this part replace the obsolete AZ1084C in existing designs?
No - the AZ1085C and AZ1084C differ in key parameters: AZ1085C delivers 3A vs. AZ1084C's 5A, has higher dropout (1.5V vs. 0.6V), and different thermal resistance. Diodes explicitly recommends AZ1084C as the functional replacement for AZ1085C, not vice versa. Migration requires validation of current capability, thermal margin, and transient response.
How should the ADJ pin be decoupled for noise-sensitive applications?
For noise-sensitive applications, place a 10nF–100nF ceramic capacitor directly between ADJ and OUTPUT pins, adjacent to the IC. This reduces high-frequency noise coupling into the reference path. Avoid routing ADJ traces near noisy signals or switching nodes, and keep feedback resistors low-impedance (<50kΩ total) to minimize EMI susceptibility.
Is the exposed tab electrically isolated in the TO263-2 package?
No - in the TO263-2 (D²PAK-2) package, the exposed tab is internally connected to the OUTPUT pin. It must be soldered to a large copper pour tied to the output net for thermal conduction and electrical continuity. Isolation requires insulating thermal pads or alternative packages like TO252-2 variants with isolated tabs.
AZ1085CS2-ADJTRE1 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-ADJTRE1 FAQ
1.How can I place an order for AZ1085CS2-ADJTRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1085CS2-ADJTRE1 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-ADJTRE1 reliable?
The price and inventory of AZ1085CS2-ADJTRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ1085CS2-ADJTRE1 is usually 5 days.
3.What payment methods are accepted for AZ1085CS2-ADJTRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1085CS2-ADJTRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1085CS2-ADJTRE1?
AZ1085CS2-ADJTRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1085CS2-ADJTRE1 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-ADJTRE1?
For technical support, including AZ1085CS2-ADJTRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1085CS2-ADJTRE1 requirements.
6.How does Aetrix verify that AZ1085CS2-ADJTRE1 is sourced from the original manufacturer or authorized distributors?
All AZ1085CS2-ADJTRE1 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-ADJTRE1 meets industry standards.
7.What is the process for return or replacement of AZ1085CS2-ADJTRE1?
All AZ1085CS2-ADJTRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1085CS2-ADJTRE1, 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-ADJTRE1 part is unused and in its original packaging.
Return procedure for AZ1085CS2-ADJTRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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