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Texas Instruments LMS1587IS-ADJ/NOPB
- Part No.:
- LMS1587IS-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
LMS1587IS-ADJ/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 3A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,690
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Product details
Overview
LMS1587IS-ADJ/NOPB from Texas Instruments is an adjustable low-dropout linear regulator delivering up to 3A output current with 1.25V internal reference, 1.15–1.3V dropout at 3A, and fast transient response optimized for microprocessor power rails. It operates across −40°C to 125°C and uses a TO-263 (KTT) package with thermal shutdown and current limiting.
For engineers reviewing the LMS1587IS-ADJ/NOPB datasheet, LMS1587IS-ADJ/NOPB pinout, LMS1587IS-ADJ/NOPB application, or LMS1587IS-ADJ/NOPB equivalent, key selection criteria include industrial temperature range support, adjustable output via two external resistors, dropout voltage under load, ripple rejection at 120Hz, and thermal resistance in DDPAK packaging.
Technical Context
The LMS1587IS-ADJ/NOPB implements a zener-trimmed bandgap reference and integrates current limiting with thermal shutdown protection. Its control architecture enables stable regulation with only two external resistors for output setting and requires a minimum 10µF output capacitor for stability.
It supports input voltages up to 13V absolute maximum and delivers regulated output over a wide VIN–VOUT differential (1.5V to 5.75V). The device exhibits 0.05% typical load regulation and 0.005% typical line regulation, with RMS output noise of 0.003% of VOUT (10Hz–10kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A maximum continuous - supports high-current logic and processor core supplies without derating at full industrial temperature range. |
| Dropout Voltage | 1.15–1.3V at 3A - enables operation with minimal input–output headroom, critical for low-voltage systems like 3.3V or 2.5V rails. |
| Reference Voltage | 1.250V ±1.2% - sets precision of adjustable output; used with R1/R2 to configure VOUT = 1.25V × (1 + R2/R1) + IADJR2. |
| Ripple Rejection | 72dB at 120Hz - suppresses input ripple from switching pre-regulators, reducing need for additional filtering stages. |
| Thermal Resistance | 0.65°C/W junction-to-case (control section) - enables high-power dissipation with proper heatsinking on PCB copper pour or external heatsink. |
| Operating Temp | −40°C to 125°C - qualified for industrial and extended-temperature embedded applications including motor control and networking equipment. |
| Quiescent Current | 7–13mA - remains low under no-load conditions, minimizing standby power loss in always-on subsystems. |
Pinout & Package
Package: TO-263 (KTT), 3-lead DDPAK surface-mount package with exposed thermal pad for enhanced heat transfer. Mounting requires soldering the tab to a large copper area for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPUT (Pin 1) | Input voltage supply terminal | Accepts unregulated DC input up to 13V max; requires local 10µF input capacitor for stability and EMI suppression. |
| OUTPUT (Pin 2) | Regulated output voltage terminal | Delivers adjustable output; connects to 10µF minimum output capacitor (tantalum or ceramic) and feedback network. |
| ADJ/GND (Pin 3) | Adjust/reference return terminal | Serves as reference node for feedback divider; must be connected directly to ground plane near output capacitor to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Stabilizes within microseconds after load step changes - maintains tight voltage tolerance during CPU burst-mode operation. |
| Adjustable output (1.25V to 12V) | Configurable via two external resistors - eliminates need for multiple fixed-voltage SKUs and simplifies BOM management. |
| Integrated protection | Current limiting and thermal shutdown - prevents damage during short-circuit or overheating events without external circuitry. |
| Low output noise | 0.003% RMS noise (10Hz–10kHz) - suitable for noise-sensitive analog sections powered from same supply rail. |
| Industrial temp grade | −40°C to 125°C operation - certified for use in harsh environments including factory automation and outdoor telecom infrastructure. |
Applications
| Pentium® Processor Supplies | PowerPC® Supplies |
|---|---|
Use Scenario: Providing clean, tightly regulated 2.5V or 3.3V core voltage to legacy Pentium-class CPUs in industrial PCs. IC Role / Device Role / Timing Role: Primary linear post-regulator following a switching pre-regulator; handles dynamic load transients with minimal droop. Use Value: Maintains <±1% output accuracy under 0–3A load steps, preventing CPU reset or timing violations during instruction execution bursts. | Use Scenario: Powering PowerPC-based control modules in automotive engine control units and avionics test equipment. IC Role / Device Role / Timing Role: Low-noise, high-reliability LDO supplying I/O and memory interface rails where EMI sensitivity prohibits switching regulators. Use Value: Delivers 72dB ripple rejection and 0.003% RMS noise, ensuring signal integrity in high-speed parallel bus interfaces. |
| Low-Voltage Logic Supplies | Microprocessor Core Rails |
Use Scenario: Generating stable 1.8V or 2.5V for FPGA I/O banks, CPLD configuration circuits, and ASIC auxiliary domains. IC Role / Device Role / Timing Role: Precision voltage source referenced to internal 1.25V bandgap; output set by resistor divider with <0.05% load regulation. Use Value: Enables reliable level-shifting and interface timing margin by holding output within ±10mV across full load and temperature range. | Use Scenario: Delivering 1.2V–3.3V core voltage to ARM Cortex-M or RISC-V SoCs in edge AI gateways and programmable logic controllers. IC Role / Device Role / Timing Role: Fast-response LDO compensating for rapid current demand shifts during clock-gated execution cycles. Use Value: Limits output deviation to <50mV during 3A/µs load steps, preserving digital logic timing margins and preventing metastability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317LDR2G | 1.25V reference, 100mA max output, SOIC-8 package - lower current, smaller footprint, no thermal shutdown. | Suitable only for low-power analog biasing or sensor excitation; not viable for >500mA loads. | Select when board space is constrained and load current remains below 100mA; avoid for processor or FPGA supplies. |
| TPS7A8300RGRT | 1.25V reference, 3A output, 0.5V dropout at 3A, 10µV RMS noise - lower dropout and noise, but requires external compensation and costs more. | Better suited for ultra-low-noise RF or high-precision ADC supplies where 0.5V headroom and sub-10µV noise are mandatory. | Choose when system-level noise budget demands <10µV RMS and input–output differential is ≤0.5V; otherwise LMS1587IS-ADJ/NOPB offers cost and simplicity advantage. |
Compared with LM317LDR2G and TPS7A8300RGRT, the LMS1587IS-ADJ/NOPB provides optimal balance of 3A capability, industrial temperature rating, integrated protection, and proven stability with minimal external components - making it preferred for robust, medium-power embedded power delivery where cost, reliability, and ease of design are prioritized.
Availability
LMS1587IS-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control systems, embedded computing platforms, and telecom infrastructure requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LMS1587IS-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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power solutions.
The LMS1587 series was designed specifically for low-dropout, high-current microprocessor and logic supply applications demanding fast transient response, thermal robustness, and industrial-grade reliability.
FAQ
What is the minimum output current required for regulation in the LMS1587IS-ADJ/NOPB?
The LMS1587IS-ADJ/NOPB requires a minimum load current of 2.0–10.0mA to maintain regulation, as specified in the Electrical Characteristics table. This ensures stable feedback loop operation and prevents output voltage drift under very light or no-load conditions. Designers must ensure this minimum current is met-either by the application load or via an intentional bleed resistor-to guarantee compliance with output voltage accuracy specs across temperature and line variations. The LMS1587IS-ADJ/NOPB datasheet explicitly defines this requirement for the adjustable version.
Can the LMS1587IS-ADJ/NOPB be used with ceramic output capacitors?
Yes, the LMS1587IS-ADJ/NOPB supports ceramic output capacitors, though the datasheet specifies a minimum 10µF value and notes that tantalum is recommended for guaranteed stability. When using ceramics, designers must verify phase margin with actual layout parasitics and may need to add a small series resistance (ESR ≥10mΩ) or adjust capacitance to meet stability criteria. The LMS1587IS-ADJ/NOPB's internal compensation is optimized for ≥10µF output capacitance with 0.1–1Ω ESR, so ceramic selection requires empirical validation per application. Always consult the LMS1587IS-ADJ/NOPB application note for layout guidance.
What is the maximum input voltage rating for the LMS1587IS-ADJ/NOPB?
The absolute maximum input voltage for the LMS1587IS-ADJ/NOPB is 13V, as stated in the Absolute Maximum Ratings table. Exceeding this voltage risks permanent damage to the internal pass transistor and bandgap circuitry. For reliable operation, the recommended maximum continuous input is 7V - consistent with the Electrical Characteristics test conditions for line regulation and dropout measurements. The LMS1587IS-ADJ/NOPB must be operated within these limits to ensure long-term reliability and specification compliance across its −40°C to 125°C temperature range.
How does the adjust pin current affect output voltage accuracy in the LMS1587IS-ADJ/NOPB?
The LMS1587IS-ADJ/NOPB adjust pin current (IADJ) is specified at ≤120µA maximum and introduces a small error term in the output voltage equation: VOUT = VREF(1 + R2/R1) + IADJR2. To minimize this error, R1 should be chosen around 100Ω so that IADJR2 remains negligible relative to the main divider term. At higher R1 values, the error grows linearly and degrades output accuracy - especially critical in precision applications. The LMS1587IS-ADJ/NOPB datasheet recommends keeping R1 ≤240Ω to hold IADJ-induced error below 1%.
Is the LMS1587IS-ADJ/NOPB RoHS compliant and lead-free?
Yes, the LMS1587IS-ADJ/NOPB is RoHS-exempt and Pb-free per TI's packaging documentation, indicated by the "/NOPB" suffix. It complies with EU RoHS requirements under applicable exemptions for leaded solderability, using Sn (tin) lead finish and meeting Level-3 moisture sensitivity (245°C peak reflow, 168-hour floor life). The device marking "LMS1587 IS-ADJ" appears on the top of the KTT package, and full compliance data is available in TI's Package Option Addendum dated February 2020. The LMS1587IS-ADJ/NOPB is approved for lead-free assembly processes.
LMS1587IS-ADJ/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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 13V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 11.7V
- Voltage Dropout (Max):
- 1.3V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 7 mA
- Current - Supply (Max):
- 13 mA
- PSRR:
- 72dB (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)
LMS1587IS-ADJ/NOPB FAQ
1.How can I place an order for LMS1587IS-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS1587IS-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 LMS1587IS-ADJ/NOPB reliable?
The price and inventory of LMS1587IS-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 LMS1587IS-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LMS1587IS-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS1587IS-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS1587IS-ADJ/NOPB?
LMS1587IS-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS1587IS-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 LMS1587IS-ADJ/NOPB?
For technical support, including LMS1587IS-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS1587IS-ADJ/NOPB requirements.
6.How does Aetrix verify that LMS1587IS-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LMS1587IS-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 LMS1587IS-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LMS1587IS-ADJ/NOPB?
All LMS1587IS-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMS1587IS-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 LMS1587IS-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LMS1587IS-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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