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Diodes Incorporated AZ1084CS-ADJTRE1
- Part No.:
- AZ1084CS-ADJTRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
AZ1084CS-ADJTRE1.pdf
- Description:
- IC REG LINEAR POS ADJ 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,638
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Product details
Overview
AZ1084CS-ADJTRE1 from Diodes Incorporated is an adjustable 5A low-dropout linear regulator with 1.35V typical dropout at full load, on-chip thermal limiting and current limiting (6.5A), and compatibility with low-ESR ceramic output capacitors. It delivers stable post-regulation for switching supplies and powers microprocessor cores in desktop PCs and embedded systems.
For engineers reviewing the AZ1084CS-ADJTRE1 datasheet, AZ1084CS-ADJTRE1 pinout, AZ1084CS-ADJTRE1 application, or AZ1084CS-ADJTRE1 equivalent, key selection criteria include dropout voltage at 5A, thermal shutdown behavior under sustained load, adjust pin current stability over temperature, line/load regulation performance, and TO252-2 (3) package thermal resistance (θJC = 7.36°C/W).
Technical Context
The AZ1084CS-ADJTRE1 uses a trimmed bandgap reference (1.225–1.270V) and internal current-limiting circuitry to maintain regulation across 0–5A output current. Its feedback loop accepts external resistors (R1/R2) to set VOUT = VREF × (1 + R2/R1) + IADJ × R2, where IADJ is 55–120µA and varies ≤5µA over operating conditions.
It operates within 0°C to +125°C junction temperature range and shuts down thermally above +150°C. Input voltage must stay ≤12V, and minimum load current is 3mA at +125°C - critical for light-load stability in battery charger standby modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5A continuous - supports high-current FPGA core rails and CPU power domains without parallel devices. |
| Dropout Voltage | 1.35V typical at 5A - enables operation from 3.3V input to 2.5V output with margin, reducing heat dissipation vs. older LDOs. |
| Reference Voltage | 1.225–1.270V - tight tolerance enables ±1% output accuracy with standard 1% resistors in adjustable configuration. |
| Line Regulation | 0.015% typical (adj version) - ensures <±0.3mV output shift over 2.85–10V input range, critical for precision analog subsystems. |
| Load Regulation | 0.1% typical (adj version) - maintains <±2.5mV output change from 0–5A load, supporting dynamic processor DVFS transitions. |
| Thermal Resistance θJC | 7.36°C/W - allows direct heatsink mounting to case tab for >3W power dissipation before thermal shutdown. |
| PSRR | 72dB at 120Hz - suppresses ripple from upstream switching converters, enabling clean supply for ADCs and PLLs. |
Pinout & Package
AZ1084CS-ADJTRE1 is packaged in TO252-2 (3), a surface-mount power package with exposed thermal pad (pin 2 = OUTPUT), optimized for PCB copper area heat spreading. Pin 1 is INPUT, pin 2 is OUTPUT, pin 3 is ADJ/GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | INPUT | Unregulated input supply connection; requires ≥10µF ceramic input capacitor placed near pin for stability and transient response. |
| 2 | OUTPUT | Regulated output node; connects to load and 22µF ceramic output capacitor; also serves as thermal conduction path to PCB. |
| 3 | ADJ/GND | Adjust reference node; ties to resistor divider (R1 to GND, R2 to OUTPUT); must be decoupled with 10nF if remote sensing is used. |
Key Features
| Feature | Design Value |
|---|---|
| Low ESR capacitor support | Stable with ≥10µF ceramic output caps - eliminates need for bulk tantalum, reducing board space and cost. |
| Thermal shutdown protection | Activates at TJ ≥ +150°C and auto-recovers after cooldown - prevents permanent damage during overload or poor heatsinking. |
| Current limit accuracy | 6.5A typical limit with no external components - provides predictable short-circuit protection without sense resistor calibration. |
| RMS output noise | 0.003% of VOUT (10Hz–10kHz) - delivers ultra-low-noise bias for RF front-ends and high-resolution data converters. |
| Lead-free & green compliance | Fully RoHS 3 compliant, halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) - meets automotive and industrial environmental mandates. |
Applications
| Microprocessor Core Supply | Battery Charger Post-Regulator |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series SoC core rails (e.g., 1.2V @ 4A) in industrial gateways requiring low-noise, high-current regulation. IC Role / Device Role / Timing Role: Primary voltage regulator delivering dynamically scaled core voltage; responds to processor VDD_REQ signals via external enable control. Use Value: 1.35V dropout enables use of 3.3V intermediate bus, reducing power loss by 35% vs. legacy 2.5V-drop LDOs; 0.003% RMS noise avoids digital jitter in clock synthesis blocks. |
Use Scenario: Final-stage regulation in multi-cell Li-ion fast chargers, converting 5V USB-PD or 9V adapter output to precise 4.2V charge voltage. IC Role / Device Role / Timing Role: Precision voltage reference amplifier with adjustable feedback; maintains ±0.5% charge voltage accuracy over temperature and aging. Use Value: 0.1% load regulation ensures <±21mV deviation from 4.2V during 0–5A charge current ramp; thermal shutdown prevents cell overvoltage during thermal runaway events. |
| Post-Regulator for DC-DC Modules | Desktop PC +12V-to-+5V Conversion |
|
Use Scenario: Clean-up stage after 12V buck converter in telecom power shelves, supplying 5V/3.3V to FPGA I/O banks and SerDes transceivers. IC Role / Device Role / Timing Role: Ripple-suppression LDO; filters switching noise from upstream converter while maintaining fast load-step response. Use Value: 72dB PSRR at 120Hz attenuates fundamental ripple by 12×; 100µs load transient recovery time prevents logic errors during burst-mode data transfers. |
Use Scenario: +5V rail generation in ATX-compliant desktop motherboards, replacing discrete transistor-based regulators for PCIe slot and USB controller power. IC Role / Device Role / Timing Role: High-current linear regulator with integrated thermal foldback; interfaces directly with motherboard VRM enable sequencing logic. Use Value: TO252-2 (3) package allows 2oz copper thermal pad layout achieving ≤25°C/W θJA - sustains 5A continuous without active cooling; RoHS/green compliance satisfies EU WEEE directives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable 5A LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1963AEST-5.0#TRPBF | Fixed 5.0V output; 1.2V dropout at 1.5A; higher quiescent current (1mA vs. 5–10mA) | Lacks adjustability; limited to fixed-voltage use cases; lower max current reduces flexibility in multi-rail designs | Select only when fixed 5.0V output and lower IQ are prioritized over programmability and 5A capability. |
| TPS75733KTTT | 3.3V fixed output; 0.9V dropout at 3A; integrated power-good flag; no adjustable version available | Designed for DSP/microcontroller I/O rails; lacks thermal foldback and requires external current limit for >3A loads | Choose for 3.3V systems needing PG signaling and moderate current; not suitable for adjustable or 5A requirements. |
Compared with LT1963AEST-5.0#TRPBF and TPS75733KTTT, AZ1084CS-ADJTRE1 uniquely combines 5A adjustability, sub-1.4V dropout, and integrated thermal/current protection - making it the only option among the three capable of replacing fixed-output LDOs in reconfigurable power architectures.
Availability
AZ1084CS-ADJTRE1 is available at Aetrix Electronics and suitable for microprocessor core supplies, battery charger post-regulators, and DC-DC module cleanup stages requiring stable component supply, long-term lifecycle assurance, and RoHS 3/green compliance.
Supply support for AZ1084CS-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q200.
AZ1084CS-ADJTRE1 belongs to the AZ1084C series of high-current LDOs designed specifically for post-regulation in power-constrained embedded and computing systems where thermal efficiency and output precision are critical.
FAQ
What is the minimum input voltage required for AZ1084CS-ADJTRE1 to regulate a 3.3V output at 5A?
The minimum input is determined by dropout voltage: VIN(MIN) = VOUT + VDROP. With 1.35V typical dropout at 5A, VIN(MIN) = 3.3V + 1.35V = 4.65V. Absolute maximum input is 12V per datasheet; recommended operating range is up to 10V for reliability. Derating is advised above 85°C ambient.
Can AZ1084CS-ADJTRE1 be used without an external heat sink in a 5A application?
Yes, but only with sufficient PCB copper area. The TO252-2 (3) package has θJC = 7.36°C/W. At 5A with 1.35V dropout, power dissipation is 6.75W. With 2oz copper thermal pad (≥4 cm²), θJA can reach ~25°C/W, limiting junction rise to ~169°C - exceeding the +125°C max operating range. A minimal heatsink or forced air is strongly recommended for continuous 5A operation.
How does the adjust pin current (IADJ) affect output voltage accuracy in the AZ1084CS-ADJTRE1?
IADJ flows through R2 in the feedback divider, adding an offset term: VOUT = VREF(1 + R2/R1) + IADJ·R2. With IADJ = 55–120µA and ±5µA variation over temperature, using R2 ≤ 10kΩ limits this error to <1.2mV - negligible vs. VREF tolerance. Higher R2 values degrade accuracy and increase noise susceptibility.
Is AZ1084CS-ADJTRE1 qualified for automotive applications per AEC-Q100?
No - the AZ1084CS-ADJTRE1 is not AEC-Q100 qualified. Diodes offers the pin-compatible AZ1084CD-ADJTRG1 variant with AEC-Q100 Grade 2 qualification (−40°C to +105°C) and PPAP support. The 'S' suffix in AZ1084CS-ADJTRE1 denotes standard industrial grade (0°C to +125°C junction), intended for commercial/industrial equipment, not automotive ECUs.
AZ1084CS-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 @ 4.5A
- Current - Output:
- 5A
- 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
AZ1084CS-ADJTRE1 FAQ
1.How can I place an order for AZ1084CS-ADJTRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1084CS-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 AZ1084CS-ADJTRE1 reliable?
The price and inventory of AZ1084CS-ADJTRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ1084CS-ADJTRE1 is usually 5 days.
3.What payment methods are accepted for AZ1084CS-ADJTRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1084CS-ADJTRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1084CS-ADJTRE1?
AZ1084CS-ADJTRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1084CS-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 AZ1084CS-ADJTRE1?
For technical support, including AZ1084CS-ADJTRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1084CS-ADJTRE1 requirements.
6.How does Aetrix verify that AZ1084CS-ADJTRE1 is sourced from the original manufacturer or authorized distributors?
All AZ1084CS-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 AZ1084CS-ADJTRE1 meets industry standards.
7.What is the process for return or replacement of AZ1084CS-ADJTRE1?
All AZ1084CS-ADJTRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1084CS-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 AZ1084CS-ADJTRE1 part is unused and in its original packaging.
Return procedure for AZ1084CS-ADJTRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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