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Texas Instruments LMS1585ACSX-ADJ/NOPB
- Part No.:
- LMS1585ACSX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
LMS1585ACSX-ADJ/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:761
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Product details
Overview
LMS1585ACSX-ADJ/NOPB from Texas Instruments is an adjustable 5A low-dropout linear regulator in TO-263 (KTT) package, featuring 1.25V reference voltage, 1.2V typical dropout at 5A, fast transient response, and integrated thermal shutdown and current limiting. It delivers stable output for microprocessor core supplies requiring precise voltage regulation under dynamic load conditions.
For engineers reviewing the LMS1585ACSX-ADJ/NOPB datasheet, LMS1585ACSX-ADJ/NOPB pinout, LMS1585ACSX-ADJ/NOPB application, or LMS1585ACSX-ADJ/NOPB equivalent, key selection considerations include adjustable output voltage range (1.25V to 12V), 5A continuous output capability, TO-263 thermal performance, and compatibility with standard 10µF output capacitance for stability.
Technical Context
The LMS1585ACSX-ADJ/NOPB implements a zener-trimmed bandgap reference and internal current-limiting circuitry, enabling accurate output voltage setting via external R1/R2 resistor divider. Its control loop is optimized for fast transient response to sudden load changes typical in microprocessor applications.
It operates over 0°C to 125°C junction temperature, supports input voltages up to 13V absolute maximum, and requires only two external resistors to configure output voltage per the equation VOUT = VREF × (1 + R2/R1) + IADJ × R2, where VREF = 1.25V and IADJ ≤ 120µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5A continuous - supports high-current logic and processor core rails without derating at moderate ambient temperatures. |
| Dropout Voltage | 1.2V at 5A - enables operation with minimal VIN–VOUT margin, e.g., 3.3V output from 4.5V input. |
| Reference Voltage | 1.250V ±1% - sets baseline accuracy for externally adjusted outputs; determines minimum VOUT = 1.25V. |
| Line Regulation | 0.005% typical - ensures <0.17mV change in VOUT per 1V VIN variation, critical for noise-sensitive analog subsystems. |
| Load Regulation | 0.05% typical - guarantees ≤1.65mV output shift from no-load to full 5A load at fixed VIN. |
| Ripple Rejection | 72dB at 120Hz - suppresses input ripple (e.g., from downstream switching converters) to sub-mV level on regulated output. |
| Quiescent Current | 7–13mA - remains low across operating range, minimizing no-load power loss in always-on systems. |
Pinout & Package
Package: TO-263 (KTT), 3-pin surface-mount, exposed thermal pad (connected to output), RoHS-exempt lead finish, MSL Level-3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPUT (Pin 1) | Input voltage supply terminal | Accepts unregulated DC input (up to 13V max); requires local 10µF ceramic or tantalum bypass capacitor. |
| OUTPUT (Pin 2) | Regulated output voltage terminal | Delivers adjustable output (1.25V–12V); connects to exposed thermal pad for heatsinking and current return path. |
| ADJ/GND (Pin 3) | Adjust/feedback reference node | Serves as precision 1.25V reference point; connects to R1–R2 divider; must be decoupled if remote sensing is used. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Configurable from 1.25V to 12V using two external resistors - eliminates need for multiple fixed-voltage SKUs. |
| Fast transient response | Minimizes output voltage deviation during rapid load steps (e.g., CPU burst mode), reducing need for oversized output capacitance. |
| Thermal shutdown protection | Activates at ~150°C junction temperature - prevents permanent damage during overload or inadequate heatsinking. |
| Current limiting | 5.0A typical foldback limit - protects against short-circuit faults while maintaining safe power dissipation. |
| Stability with 10µF output cap | Guaranteed stable with ≥10µF tantalum or ceramic output capacitor - simplifies layout and reduces BOM count. |
Applications
| Pentium® Processor Core Supply | PowerPC® System Rail |
|---|---|
Use Scenario: Powers Pentium-class CPU core requiring tightly regulated 1.8V or 2.5V at up to 5A with fast load transients. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout post-regulator delivering clean core voltage after intermediate DC/DC conversion. Use Value: 72dB ripple rejection and 0.05% load regulation ensure stable core voltage during instruction fetch bursts, preventing timing violations. | Use Scenario: Supplies PowerPC® SoC I/O or memory interface rail at 3.3V or adjustable voltage in industrial control systems. IC Role / Device Role / Timing Role: High-current linear regulator providing EMI-free, low-noise bias for sensitive digital interfaces. Use Value: Fast transient response maintains voltage within ±1% during bus arbitration events, ensuring reliable data integrity. |
| Low-Voltage Logic Sequencing | FPGA Configuration Rail |
Use Scenario: Generates 1.2V or 1.5V for ASIC/FPGA core logic in multi-rail power architectures with strict sequencing requirements. IC Role / Device Role / Timing Role: Adjustable LDO used in power tree for precise voltage ramp-up and hold-off timing via enable control. Use Value: 1.25V reference accuracy and 0.005% line regulation enable predictable startup behavior across input voltage tolerances. | Use Scenario: Provides stable 2.5V configuration voltage to FPGA configuration pins during boot, prior to main core rail activation. IC Role / Device Role / Timing Role: Standby-capable LDO delivering low-noise, low-ripple supply independent of main system regulators. Use Value: 120µA max adjust pin current minimizes divider error, ensuring accurate 2.5V setpoint even with high-resistance feedback networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM338KTP/NOPB | 5A adjustable LDO in TO-220; higher dropout (2V typ), lower PSRR (60dB), no thermal shutdown auto-recovery. | Less suitable for low-VIN applications; requires larger heatsink due to higher thermal resistance (2.7°C/W vs. 0.65°C/W junction-to-case). | Select when TO-220 mounting is required and input headroom >2V is available. |
| LMS1587CSX-ADJ/NOPB | 3A version in same KTT package; identical pinout, reference voltage, and features but reduced current rating and thermal limits. | Valid drop-in replacement only if peak load ≤3A; lower power dissipation allows simpler thermal design. | Choose for cost-sensitive designs with <3A sustained load and identical board footprint. |
Compared with LM338KTP/NOPB, LMS1585ACSX-ADJ/NOPB offers superior thermal performance and tighter regulation; versus LMS1587CSX-ADJ/NOPB, it provides 67% higher output current while sharing layout compatibility - enabling scalable power design without PCB revision.
Availability
LMS1585ACSX-ADJ/NOPB is available at Aetrix Electronics and suitable for Pentium® processor supplies, PowerPC® system rails, and FPGA configuration circuits requiring stable component supply, long-term manufacturability, and RoHS-exempt compliance.
Supply support for LMS1585ACSX-ADJ/NOPB 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
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability linear regulators and power solutions.
The LMS1585A series was designed specifically for low-voltage, high-current microprocessor core and I/O supplies demanding fast transient response, low dropout, and robust thermal protection in commercial-temperature environments.
FAQ
What output voltage range can be set with the LMS1585ACSX-ADJ/NOPB?
The LMS1585ACSX-ADJ/NOPB supports an adjustable output voltage range from 1.25V to 12V, determined by the external resistor divider connected to the ADJ pin. The reference voltage is 1.25V ±1%, and the output follows VOUT = 1.25V × (1 + R2/R1) + IADJ × R2, where IADJ ≤ 120µA. This allows precise tailoring for core logic, I/O, or analog subsystems without requiring multiple fixed-output variants.
Does the LMS1585ACSX-ADJ/NOPB require an external capacitor for stability?
Yes, the LMS1585ACSX-ADJ/NOPB requires a minimum 10µF output capacitor (tantalum or ceramic) for guaranteed stability, as specified in the datasheet. Input capacitance of 10µF is also recommended. The device is optimized for this value - smaller capacitors may cause oscillation, while larger values do not harm stability but increase start-up time and physical footprint.
What is the maximum input voltage rating for the LMS1585ACSX-ADJ/NOPB?
The absolute maximum input voltage for the LMS1585ACSX-ADJ/NOPB is 13V referenced to GND. Operating above this risks permanent damage. For reliable operation, TI specifies recommended input ranges: e.g., ≥4.75V for 3.3V fixed versions, and ≥(VOUT + 1.5V) for adjustable configurations to ensure sufficient headroom across temperature and load.
How does thermal protection work in the LMS1585ACSX-ADJ/NOPB?
The LMS1585ACSX-ADJ/NOPB incorporates thermal shutdown that activates at approximately 150°C junction temperature. When triggered, the output is disabled until the die cools below the hysteresis threshold (~135°C), then resumes regulation automatically. This protects against irreversible damage during sustained overload or insufficient heatsinking, and is fully integrated - no external components needed.
Is the LMS1585ACSX-ADJ/NOPB pin-compatible with other LMS1585A variants?
Yes, the LMS1585ACSX-ADJ/NOPB shares identical TO-263 (KTT) 3-pin pinout and footprint with all LMS1585A fixed-output variants (e.g., LMS1585ACSX-3.3/NOPB) and the LMS1587CSX-ADJ/NOPB. Pin 1 is INPUT, Pin 2 is OUTPUT, Pin 3 is ADJ/GND - enabling direct substitution in existing layouts when current or voltage requirements change.
LMS1585ACSX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 13V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 11.6V
- Voltage Dropout (Max):
- 1.4V @ 5A
- Current - Output:
- 5A
- Current - Quiescent (Iq):
- 7 mA
- Current - Supply (Max):
- 13 mA
- 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 (DDPAK-3)
LMS1585ACSX-ADJ/NOPB FAQ
1.How can I place an order for LMS1585ACSX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS1585ACSX-ADJ/NOPB 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 LMS1585ACSX-ADJ/NOPB reliable?
The price and inventory of LMS1585ACSX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS1585ACSX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LMS1585ACSX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS1585ACSX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS1585ACSX-ADJ/NOPB?
LMS1585ACSX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS1585ACSX-ADJ/NOPB 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 LMS1585ACSX-ADJ/NOPB?
For technical support, including LMS1585ACSX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS1585ACSX-ADJ/NOPB requirements.
6.How does Aetrix verify that LMS1585ACSX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LMS1585ACSX-ADJ/NOPB 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 LMS1585ACSX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LMS1585ACSX-ADJ/NOPB?
All LMS1585ACSX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMS1585ACSX-ADJ/NOPB, 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 LMS1585ACSX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LMS1585ACSX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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