My Inquiry
My Account
Texas Instruments LMS1587CS-ADJ/NOPB
- Part No.:
- LMS1587CS-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
LMS1587CS-ADJ/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 3A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:291
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMS1587CS-ADJ/NOPB from Texas Instruments is a 3A adjustable low-dropout linear regulator in TO-263 (KTT) package, featuring 1.25V internal reference, 1.3V typical dropout at 3A, 0.05% load regulation, and fast transient response optimized for microprocessor core supplies. It operates across 0°C to 125°C and supports output voltage setting via two external resistors.
For engineers reviewing the LMS1587CS-ADJ/NOPB datasheet, LMS1587CS-ADJ/NOPB pinout, LMS1587CS-ADJ/NOPB application, or LMS1587CS-ADJ/NOPB equivalent, this page delivers verified specifications, thermal design guidance, regulator stability requirements, and direct alternatives for industrial-grade 3A adjustable LDO selection.
Technical Context
The LMS1587CS-ADJ/NOPB integrates a zener-trimmed bandgap reference, current-limiting circuitry, and thermal shutdown protection. Its control architecture maintains regulation with ≤1.275V reference tolerance over temperature and load, enabling precise output programming.
Designed for low-voltage logic and microprocessor applications, it delivers 72dB ripple rejection at 120Hz with 25µF tantalum output capacitance and requires only 10µF input/output ceramic or tantalum capacitors for stability - no additional compensation needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A maximum continuous - supports high-current digital loads without derating at 25°C ambient with adequate heatsinking. |
| Dropout Voltage | 1.3V typical at 3A - enables operation with VIN as low as VOUT + 1.3V, critical for 3.3V/2.5V/1.8V system rails. |
| Reference Voltage | 1.250V ±1.2% (1.225–1.275V) - sets output accuracy baseline for resistor-divider programming of any VOUT ≥1.25V. |
| Load Regulation | 0.05% typical - ensures ≤1.65mV change in 3.3V output across full 0–3A load range, minimizing supply-induced logic errors. |
| Ripple Rejection | 72dB at 120Hz - suppresses input ripple to <0.02% of VOUT, essential for noise-sensitive analog/digital mixed-signal systems. |
| Quiescent Current | 7–13mA - remains stable across input voltage and load, enabling predictable power budgeting in always-on subsystems. |
| Thermal Resistance | 0.65°C/W junction-to-case - allows direct mounting to PCB copper pour or heatsink for sustained 3A operation at TJ ≤125°C. |
Pinout & Package
Package: DDPAK/TO-263 (KTT), 3-pin surface-mount with exposed thermal pad. Requires soldering to ≥4 cm² copper area for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Supply Terminal | Accepts 2.75–7V DC input; must be decoupled with ≥10µF capacitor within 5mm of pin to ensure stability and transient response. |
| VOUT | Regulated Output Terminal | Delivers programmable output voltage; connects to load and output capacitor; serves as reference node for ADJ feedback divider. |
| ADJ | Adjust Terminal | Connects to resistor divider (R1–R2); senses 1.25V reference; draws ≤120µA - negligible error when R1 ≤100Ω. |
Key Features
| Feature | Design Value |
|---|---|
| Fast Transient Response | Stabilizes within microseconds after load step - prevents brownout during CPU burst-mode operation. |
| Integrated Protection | Current limiting (3.1–4.3A) and thermal shutdown - eliminates need for external fault-handling circuitry. |
| Low Line Regulation | 0.005% typical - maintains output accuracy despite input rail sag (e.g., battery discharge or upstream converter droop). |
| Adjustable Output | Programmable from 1.25V to VIN − 1.3V using two resistors - supports custom voltages for FPGAs, ASICs, and memory interfaces. |
| Commercial Temp Range | 0°C to 125°C junction - qualified for industrial control, networking, and embedded computing environments. |
Applications
| Pentium® Processor Core Supply | PowerPC® I/O Rail Regulation |
|---|---|
|
Use Scenario: Powers CPU core logic requiring tightly regulated 1.5V–2.5V at up to 3A with minimal voltage deviation during dynamic load changes. IC Role / Device Role / Timing Role: Primary low-noise, high-current LDO delivering stable core voltage synchronized to processor clock domains. Use Value: 0.05% load regulation and 72dB ripple rejection prevent timing violations and logic errors under 2A/µs load transients. |
Use Scenario: Supplies 3.3V I/O banks for PowerPC-based communication controllers in industrial gateways. IC Role / Device Role / Timing Role: Fixed or adjustable post-regulator ensuring clean, low-impedance interface voltage for LVCMOS/LVTTL signaling. Use Value: Fast transient response maintains signal integrity during burst data transfers; TO-263 thermal pad enables conduction cooling in sealed enclosures. |
| Low-Voltage FPGA Configuration Supply | Industrial PLC Logic Controller Rail |
|
Use Scenario: Generates 1.2V or 1.8V configuration voltage for Xilinx/Intel FPGAs where power sequencing and noise sensitivity are critical. IC Role / Device Role / Timing Role: Precision-adjustable LDO providing sequenced, low-noise bias for configuration SRAM and I/O banks. Use Value: 1.25V reference tolerance ≤±1.2% ensures reliable bitstream loading; 10µF stability requirement simplifies BOM and layout. |
Use Scenario: Delivers 5V or 3.3V logic supply in programmable logic controllers operating continuously in 0–70°C ambient. IC Role / Device Role / Timing Role: Robust industrial-grade LDO replacing switching regulators where EMI must be minimized near analog sensors. Use Value: Integrated thermal shutdown and current limit eliminate field failures due to overload or ambient overheating; TO-263 package supports conformal coating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMS1587CT-ADJ/NOPB | Same electrical specs but TO-220 (NDE) package; higher θJA (2.7°C/W vs. 0.65°C/W junction-to-case); no exposed thermal pad. | Suitable for prototyping or low-volume through-hole assembly; requires external heatsink for >1.5A continuous operation. | Select when manual soldering, legacy board compatibility, or vertical mounting is required - not for space-constrained SMT designs. |
| LM317LZ/NOPB | 100mA max output; 1.25V reference; 2V dropout; TO-92 package; no thermal shutdown or current limit. | Only viable for ultra-low-power analog biasing (e.g., sensor front-ends), not microprocessor or FPGA supplies. | Choose only for sub-100mA, cost-sensitive applications where protection and thermal performance are secondary. |
Compared with LMS1587CS-ADJ/NOPB, the TO-220 variant trades thermal efficiency for assembly flexibility, while LM317LZ sacrifices current capability and protection for footprint and cost - making LMS1587CS-ADJ/NOPB the sole choice for robust 3A SMT LDO needs.
Availability
LMS1587CS-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, FPGA carrier boards, Pentium-class embedded controllers, and PowerPC-based communications equipment requiring stable component supply across extended temperature ranges.
Supply support for LMS1587CS-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 linear regulators and power solutions.
The LMS1587 series was designed specifically for low-dropout, fast-response regulation in microprocessor and digital logic systems - prioritizing thermal robustness, output accuracy, and ease of stabilization over switching efficiency.
FAQ
What is the minimum output current required for regulation in LMS1587CS-ADJ/NOPB?
The LMS1587CS-ADJ/NOPB requires a minimum load current of 2.0–10.0mA to maintain regulation, as specified in its Electrical Characteristics table. This ensures proper biasing of internal circuitry; operation below this range may cause output voltage drift or instability, especially near dropout conditions.
Can LMS1587CS-ADJ/NOPB be used with ceramic output capacitors?
Yes, LMS1587CS-ADJ/NOPB is stable with ceramic output capacitors ≥10µF, provided ESR is ≥5mΩ. The datasheet specifies "10 µF" as the required value for stability - confirmed across both tantalum and ceramic types - eliminating need for ESR-tuning networks in modern designs.
What is the maximum input voltage rating for LMS1587CS-ADJ/NOPB?
The absolute maximum input-to-ground voltage for LMS1587CS-ADJ/NOPB is 13V. However, for reliable operation within specifications, input voltage must remain between 2.75V and 7V - exceeding 7V risks exceeding power dissipation limits even at light loads.
How does the ADJ pin current affect output voltage accuracy in LMS1587CS-ADJ/NOPB?
The ADJ pin draws ≤120µA, introducing a small error in the feedback divider. For example, with R2 = 10kΩ, this adds ≤1.2mV offset. Using R1 ≤100Ω keeps this error below 0.1% of VOUT - a design practice explicitly recommended in the LMS1587CS-ADJ/NOPB application note.
Is LMS1587CS-ADJ/NOPB RoHS compliant?
LMS1587CS-ADJ/NOPB is RoHS exempt per TI's packaging documentation, due to lead finish requirements for reliability in high-temperature soldering and thermal cycling. It meets JEDEC MSL Level-3 handling standards and is qualified for commercial temperature operation (0°C to 125°C).
LMS1587CS-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:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-3)
LMS1587CS-ADJ/NOPB FAQ
1.How can I place an order for LMS1587CS-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS1587CS-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 LMS1587CS-ADJ/NOPB reliable?
The price and inventory of LMS1587CS-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 LMS1587CS-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LMS1587CS-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS1587CS-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS1587CS-ADJ/NOPB?
LMS1587CS-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS1587CS-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 LMS1587CS-ADJ/NOPB?
For technical support, including LMS1587CS-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS1587CS-ADJ/NOPB requirements.
6.How does Aetrix verify that LMS1587CS-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LMS1587CS-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 LMS1587CS-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LMS1587CS-ADJ/NOPB?
All LMS1587CS-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMS1587CS-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 LMS1587CS-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LMS1587CS-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS1587CS-ADJ/NOPB Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
