My Inquiry
My Account
Texas Instruments LMS1587CSX-ADJ/NOPB
- Part No.:
- LMS1587CSX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
LMS1587CSX-ADJ/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 3A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,442
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMS1587CSX-ADJ/NOPB from Texas Instruments is a 3A adjustable low-dropout linear regulator in DDPAK/TO-263 (KTT) package, featuring 1.25V internal reference, 1.15–1.3V dropout at 3A, and fast transient response optimized for microprocessor core supplies. It delivers stable output voltage set via two external resistors and includes thermal shutdown and current limiting.
For engineers reviewing the LMS1587CSX-ADJ/NOPB datasheet, LMS1587CSX-ADJ/NOPB pinout, LMS1587CSX-ADJ/NOPB application, or LMS1587CSX-ADJ/NOPB equivalent, this page provides verified technical context, exact pin roles, real-world use cases in embedded power rails, and validated alternative options for supply chain continuity.
Technical Context
The LMS1587CSX-ADJ/NOPB uses a zener-trimmed bandgap reference and integrated error amplifier to regulate output voltage based on feedback from the ADJ pin. Its control loop enables fast transient response with minimal output capacitance-only 10 µF required for stability.
It operates over 0°C to 125°C junction temperature, supports input voltages up to 13V, and features internal current limiting (3.1–4.3A) and thermal protection. The device requires no minimum load above 2.0 mA and maintains ≤0.05% typical load regulation across its 3A output range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A maximum continuous-supports mid-power logic rails without derating at 25°C ambient. |
| Dropout Voltage | 1.15–1.3V at 3A-enables operation with <1.5V VIN–VOUT margin, critical for low-voltage core supplies. |
| Reference Voltage | 1.225–1.275V over temp-sets precise output via R1/R2 divider; enables ±1.5% VOUT accuracy with standard 1% resistors. |
| Line Regulation | 0.005% typical-ensures <0.165mV change per 1V input shift, minimizing ripple propagation in sensitive analog sections. |
| Ripple Rejection | 72dB at 120Hz-rejects switching noise from upstream DC/DC converters feeding the LDO input. |
| Quiescent Current | 7–13mA-low static draw preserves efficiency in always-on subsystems without compromising regulation speed. |
| Thermal Resistance | 0.65°C/W junction-to-case-requires PCB copper thermal pad for full 3A capability; enables >2W dissipation with 20°C rise. |
Pinout & Package
Package: DDPAK/TO-263 (KTT), 3-pin surface-mount with exposed thermal pad. Requires soldered thermal pad and ≥2 cm² 2-oz copper for rated 3A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.75–13V DC; must be decoupled with ≥10µF capacitor near pin to suppress high-frequency noise. |
| VOUT | Regulated output | Delivers adjustable voltage (≥1.25V); connects to R1–R2 feedback network and load capacitance. |
| ADJ | Adjust terminal | Senses 1.25V reference; sets VOUT = 1.25V × (1 + R2/R1) + IADJ×R2; IADJ ≤120µA ensures <0.1% error with R1 = 100Ω. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Stabilizes within microseconds after load step-reduces need for large bulk capacitors in CPU/GPU power domains. |
| Adjustable output (1.25V min) | Supports custom rail voltages (e.g., 1.8V, 2.5V, 3.3V) using only two external resistors-no BOM changes for multiple designs. |
| Integrated protection | Current limiting and thermal shutdown prevent damage during overload or poor heatsinking-eliminates need for external fault circuitry. |
| Low line/load regulation | 0.005% line and 0.05% load regulation-maintains tight voltage tolerance under varying input and load conditions. |
| Stable with ceramic output caps | Compatible with low-ESR ceramic capacitors ≥10µF-reduces board area vs. tantalum and improves reliability. |
Applications
| Pentium® Processor Core Supply | PowerPC® I/O Rail Regulation |
|---|---|
Use Scenario: Powers Pentium-class CPU core at 1.8V/2.5V derived from a higher intermediate rail (e.g., 5V or 3.3V). IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise core voltage with fast transient recovery during burst-mode execution. Use Value: 72dB ripple rejection and sub-10µs transient response prevent logic errors during high-current CPU state transitions. | Use Scenario: Supplies 3.3V I/O banks for PowerPC-based industrial controllers requiring stable interface voltage. IC Role / Device Role / Timing Role: Fixed or adjustable low-noise LDO ensuring consistent signal integrity for parallel bus timing margins. Use Value: 0.05% load regulation maintains <1.7mV variation across 0–3A load swing-preserves setup/hold timing margins. |
| Low-Voltage FPGA Configuration Rail | Industrial PLC Analog Front-End Bias |
Use Scenario: Generates 1.2V configuration voltage for Xilinx/Altera FPGAs from a shared 3.3V system rail. IC Role / Device Role / Timing Role: Precision-adjustable LDO providing tightly regulated bias for configuration SRAM and I/O banks. Use Value: 1.225–1.275V reference tolerance and 0.65°C/W θJA enable ±1.2% VOUT accuracy over 0–125°C without calibration. | Use Scenario: Supplies 2.5V reference and bias for 16-bit ADCs/DACs in programmable logic controller modules. IC Role / Device Role / Timing Role: Ultra-low-noise linear regulator isolating precision analog circuitry from noisy digital power domains. Use Value: RMS output noise of 0.003% of VOUT (<75µV RMS at 2.5V) prevents quantization errors in 16-bit conversion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A8300RGRT | 3A, 20µVRMS noise, 500kHz PSRR bandwidth, but 1.1V min VIN–VOUT; requires 2.2µF ceramic cap. | Better noise/PSRR for RF/analog; less tolerant of ultra-low headroom than LMS1587CSX-ADJ/NOPB. | Select when ultra-low noise dominates over dropout voltage; verify thermal design for same 3A load. |
| LT1963AES8#TRPBF | 1.5A max, 1.22V ref, 0.33V dropout at 1.5A, SO-8 package; no exposed thermal pad. | Lower current, smaller footprint, lower thermal performance-suitable for space-constrained <2A rails. | Choose for compact designs where 1.5A suffices and TO-263 mounting is impractical. |
Compared with TPS7A8300RGRT and LT1963AES8#TRPBF, the LMS1587CSX-ADJ/NOPB offers superior thermal handling via its exposed KTT pad and higher current rating, making it optimal for sustained 3A loads in industrial control and computing applications where board-level heat spreading is feasible.
Availability
LMS1587CSX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, embedded computing power rails, and FPGA configuration supplies requiring stable component supply with long lifecycle support.
Supply support for LMS1587CSX-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-voltage microprocessor and logic supply applications demanding fast transient response, low dropout, and robust thermal protection in cost-sensitive industrial and commercial systems.
FAQ
What is the minimum output voltage achievable with LMS1587CSX-ADJ/NOPB?
The LMS1587CSX-ADJ/NOPB has a 1.225–1.275V internal reference voltage, enabling output voltages as low as 1.25V (typical) when configured with R2 = 0Ω and R1 selected for bias current. For stable regulation, VOUT must remain ≥1.25V; outputs below this threshold are not supported or specified.
Does LMS1587CSX-ADJ/NOPB require an external capacitor on the ADJ pin?
No, the LMS1587CSX-ADJ/NOPB does not require an external capacitor on the ADJ pin. Stability is ensured with ≥10µF output capacitance (ceramic or tantalum). Adding capacitance to ADJ may degrade transient response and is not recommended per TI's SNVS061G datasheet.
Can LMS1587CSX-ADJ/NOPB be used in parallel for higher current?
No, the LMS1587CSX-ADJ/NOPB is not designed for parallel operation. Its ADJ pin architecture lacks current-sharing capability, and mismatched reference voltages would cause unequal load distribution. For >3A, select the 5A-rated LMS1585ACSX-ADJ/NOPB or use a dedicated current-sharing controller.
What is the maximum allowable input voltage for LMS1587CSX-ADJ/NOPB?
The absolute maximum input voltage for LMS1587CSX-ADJ/NOPB is 13V relative to GND, as specified in the Absolute Maximum Ratings table. Continuous operation above 7V is discouraged due to thermal limitations-power dissipation exceeds safe limits unless heatsinking is significantly enhanced.
Is LMS1587CSX-ADJ/NOPB RoHS compliant?
Yes, LMS1587CSX-ADJ/NOPB is RoHS exempt per TI's packaging documentation, meaning it complies with RoHS Directive 2011/65/EU but contains lead in the solder finish (SnPb) for enhanced reliability in high-temperature reflow and thermal cycling environments.
LMS1587CSX-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):
- 11.7V
- 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)
LMS1587CSX-ADJ/NOPB FAQ
1.How can I place an order for LMS1587CSX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS1587CSX-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 LMS1587CSX-ADJ/NOPB reliable?
The price and inventory of LMS1587CSX-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 LMS1587CSX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LMS1587CSX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS1587CSX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS1587CSX-ADJ/NOPB?
LMS1587CSX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS1587CSX-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 LMS1587CSX-ADJ/NOPB?
For technical support, including LMS1587CSX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS1587CSX-ADJ/NOPB requirements.
6.How does Aetrix verify that LMS1587CSX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LMS1587CSX-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 LMS1587CSX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LMS1587CSX-ADJ/NOPB?
All LMS1587CSX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMS1587CSX-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 LMS1587CSX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LMS1587CSX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS1587CSX-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.…
