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Texas Instruments LMS1585AIS-1.5/NOPB
- Part No.:
- LMS1585AIS-1.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
LMS1585AIS-1.5/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:400
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Product details
Overview
LMS1585AIS-1.5/NOPB from Texas Instruments is a 1.5V fixed-output, 5A low-dropout linear regulator in TO-263 (KTT) package, featuring 1.2V typical dropout at 5A, ±1% output voltage accuracy over load/temperature, and fast transient response for microprocessor core supplies.
For engineers reviewing the LMS1585AIS-1.5/NOPB datasheet, LMS1585AIS-1.5/NOPB pinout, LMS1585AIS-1.5/NOPB application, or LMS1585AIS-1.5/NOPB equivalent, this page delivers verified electrical specs, thermal performance data, industrial-grade (−40°C to 125°C) operation, and real-world design context for high-current low-voltage regulation.
Technical Context
The LMS1585AIS-1.5/NOPB integrates a zener-trimmed bandgap reference, current limiting, and thermal shutdown circuitry. Its internal architecture enables stable regulation with only two external capacitors (10µF input/output), and supports operation with input voltages as low as 2.75V above VOUT.
Designed for high-current, low-noise applications, it delivers 72dB ripple rejection at 120Hz with 25µF tantalum output capacitance and exhibits 0.003%/W thermal regulation - critical for thermally varying embedded systems requiring consistent voltage under dynamic load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5V ±1% (ensured across 0–5A load and −40°C to 125°C junction temperature) |
| Max Output Current | 5A continuous (with adequate heatsinking; current limit threshold 5.0–6.6A) |
| Dropout Voltage | 1.2V typical at 5A (enables operation from 2.7V input for 1.5V output) |
| Line Regulation | 0.005% typical (±0.2% max; ensures minimal output shift with input variation) |
| Load Regulation | 0.05% typical (±0.5% max; maintains tight voltage control across full 0–5A range) |
| Ripple Rejection | 72dB at 120Hz (suppresses switching noise from upstream DC/DC converters) |
| Quiescent Current | 7–13mA (low no-load power loss; suitable for always-on subsystems) |
Pinout & Package
Package: DDPAK/TO-263 (KTT), 3-pin surface-mount, thermally enhanced with exposed metal tab for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPUT (Pin 1) | Input voltage supply terminal | Accepts 2.75V to 13V input; requires ≥10µF ceramic or tantalum input capacitor for stability |
| OUTPUT (Pin 2) | Regulated output voltage terminal | Delivers 1.5V ±1% at up to 5A; connects to load and 10µF output capacitor |
| ADJ/GND (Pin 3) | Ground reference and adjust node (fixed version) | Serves as ground return path; internally connected to feedback divider for 1.5V fixed output |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Stabilizes within microseconds after load step changes - essential for CPU core voltage tracking |
| Thermal shutdown protection | Activates at TJ ≥150°C and auto-recovers upon cooling - prevents permanent damage during overload |
| Current limiting | Holds output current at 5–6.6A during short-circuit or overcurrent - protects both IC and downstream circuitry |
| Industrial temperature range | Guaranteed operation from −40°C to 125°C junction temperature - suitable for automotive under-hood and industrial control environments |
| Low RMS output noise | 0.003% of VOUT (10Hz–10kHz) - minimizes jitter in analog-sensitive or clocking circuits powered from this rail |
Applications
| Pentium® Processor Core Supply | PowerPC® System Rail |
|---|---|
Use Scenario: Powers the core voltage rail of legacy Pentium-class microprocessors requiring stable 1.5V at up to 5A with fast load-step response. IC Role / Device Role / Timing Role: Primary low-noise, high-current linear regulator delivering clean core voltage independent of upstream DC/DC switching noise. Use Value: Maintains <±1% output accuracy across temperature and load while rejecting >70dB of ripple - ensuring reliable CPU operation without brownouts or timing violations. | Use Scenario: Supplies the I/O or auxiliary logic rail in PowerPC-based industrial controllers operating in extended temperature environments. IC Role / Device Role / Timing Role: Fixed-output LDO providing robust, thermally resilient 1.5V bias for FPGA configuration, memory interfaces, or peripheral logic. Use Value: −40°C to 125°C guaranteed operation and 0.003%/W thermal regulation enable stable voltage delivery despite ambient fluctuations in factory-floor deployments. |
| Low-Voltage Logic Distribution | Microprocessor Standby Rail |
Use Scenario: Generates 1.5V for advanced CMOS logic families (e.g., LVCMOS15) in test equipment and programmable logic systems. IC Role / Device Role / Timing Role: Precision voltage source for signal integrity-critical digital rails where noise and regulation error directly impact setup/hold margins. Use Value: 0.05% load regulation and 72dB ripple rejection preserve signal eye diagrams and reduce bit-error rates in high-speed parallel buses. | Use Scenario: Provides always-on 1.5V standby power to real-time clocks, wake-up controllers, and retention memory in battery-backed embedded systems. IC Role / Device Role / Timing Role: Low-quiescent-current (7–13mA) LDO maintaining regulated voltage during deep-sleep modes without compromising wake latency. Use Value: Enables >10-year battery life in maintenance-free IoT nodes by minimizing no-load power loss while retaining full 5A surge capability on wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1585A-1.5#PBF | Pin-compatible but higher 1.5V output tolerance (±2% vs. ±1%), 1.3V dropout at 5A (vs. 1.2V), and no −40°C rating | Commercial-only (0°C to 125°C); not qualified for industrial or automotive ambient conditions | Select when cost sensitivity outweighs precision and temperature range requirements |
| LMS1585ACT-1.5/NOPB | Same electrical specs but TO-220 (NDE) through-hole package; higher θJA (2.7°C/W vs. 0.65°C/W case-to-heatsink) | Requires mechanical mounting and heatsink; less suitable for high-density SMT layouts or automated assembly | Select for prototyping, manual assembly, or legacy board designs with TO-220 footprints |
Compared with LT1585A-1.5#PBF and LMS1585ACT-1.5/NOPB, the LMS1585AIS-1.5/NOPB offers tighter output accuracy, wider temperature qualification, and superior thermal performance in surface-mount form - making it optimal for production-grade industrial and compute applications demanding reliability and density.
Availability
LMS1585AIS-1.5/NOPB is available at Aetrix Electronics and suitable for Pentium® processor supplies, PowerPC® system rails, and low-voltage logic distribution requiring stable component supply across industrial temperature grades and long-lifecycle programs.
Supply support for LMS1585AIS-1.5/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 leader specializing in analog, embedded processing, and power management technologies with decades of LDO regulator innovation.
The LMS1585A series was engineered specifically for high-current, low-noise microprocessor core and I/O rail regulation - emphasizing fast transient response, thermal resilience, and industrial-grade reliability in compact surface-mount packages.
FAQ
What is the maximum input voltage rating for the LMS1585AIS-1.5/NOPB?
The LMS1585AIS-1.5/NOPB has an absolute maximum input-to-ground voltage of 13V. Operation beyond this risks permanent damage. For reliable 1.5V output, VIN must remain ≥2.75V above VOUT (i.e., ≥4.25V minimum), with recommended input range of 4.5V to 7V per datasheet characterization.
Does the LMS1585AIS-1.5/NOPB require external resistors to set output voltage?
No. The LMS1585AIS-1.5/NOPB is a fixed-output variant with internal resistor divider; no external resistors are needed. The ADJ/GND pin is internally connected to the feedback network and serves solely as the ground reference terminal - unlike adjustable versions such as LMS1585ACS-ADJ/NOPB.
What thermal performance can be expected from the LMS1585AIS-1.5/NOPB in a standard 4-layer PCB layout?
In a standard 4-layer PCB with 2-in² copper pour under the exposed tab, the LMS1585AIS-1.5/NOPB achieves ~35°C/W junction-to-ambient. At 5A with 2V dropout (10W dissipation), this yields ~350°C rise - confirming mandatory external heatsinking. With proper 1-in² thermal pad and 2oz copper, θJA drops to ~25°C/W, enabling safe 5A operation below 125°C junction.
Is the LMS1585AIS-1.5/NOPB RoHS compliant and lead-free?
Yes. The LMS1585AIS-1.5/NOPB carries the "/NOPB" suffix indicating Pb-Free (RoHS Exempt) construction per TI's packaging standards. It uses Sn (tin) lead finish and complies with JEDEC MSL Level-3 moisture sensitivity classification for reflow soldering at 245°C peak.
How does the LMS1585AIS-1.5/NOPB handle short-circuit conditions?
The LMS1585AIS-1.5/NOPB features foldback current limiting and thermal shutdown. Under short-circuit, output current is limited to 5.0–6.6A (typical 6A), reducing power dissipation. If junction temperature exceeds 150°C, thermal shutdown disables the pass element until cooldown - then automatically resumes regulation without latch-up or manual reset.
LMS1585AIS-1.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 13V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.4V @ 5A
- Current - Output:
- 5A
- Current - Quiescent (Iq):
- 7 mA
- Current - Supply (Max):
- 13 mA
- PSRR:
- 60 ~ 72 dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-3)
LMS1585AIS-1.5/NOPB FAQ
1.How can I place an order for LMS1585AIS-1.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS1585AIS-1.5/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 LMS1585AIS-1.5/NOPB reliable?
The price and inventory of LMS1585AIS-1.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS1585AIS-1.5/NOPB is usually 5 days.
3.What payment methods are accepted for LMS1585AIS-1.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS1585AIS-1.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS1585AIS-1.5/NOPB?
LMS1585AIS-1.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS1585AIS-1.5/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 LMS1585AIS-1.5/NOPB?
For technical support, including LMS1585AIS-1.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS1585AIS-1.5/NOPB requirements.
6.How does Aetrix verify that LMS1585AIS-1.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LMS1585AIS-1.5/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 LMS1585AIS-1.5/NOPB meets industry standards.
7.What is the process for return or replacement of LMS1585AIS-1.5/NOPB?
All LMS1585AIS-1.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMS1585AIS-1.5/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 LMS1585AIS-1.5/NOPB part is unused and in its original packaging.
Return procedure for LMS1585AIS-1.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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