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Texas Instruments LMS1587CS-1.5/NOPB
- Part No.:
- LMS1587CS-1.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
LMS1587CS-1.5/NOPB.pdf
- Description:
- IC REG LIN 1.5V 3A DDPAK/TO263-3
- Quantity:
- Payment:
- Shipping:
Inventory:413
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Product details
Overview
LMS1587CS-1.5/NOPB from Texas Instruments is a 3A, 1.5V fixed-output low-dropout linear regulator in TO-263 (KTT) package, featuring 1.2V typical dropout at 3A, fast transient response, and integrated thermal shutdown and current limiting. It delivers stable power to microprocessor core supplies, low-voltage logic rails, and embedded system point-of-load converters.
For engineers reviewing the LMS1587CS-1.5/NOPB datasheet, LMS1587CS-1.5/NOPB pinout, LMS1587CS-1.5/NOPB application, or LMS1587CS-1.5/NOPB equivalent, key selection criteria include output current capability (3A), dropout voltage (≤1.3V at full load), thermal performance in DDPAK package, and compatibility with standard 10µF output capacitance for stability.
Technical Context
The LMS1587CS-1.5/NOPB uses an internal zener-trimmed bandgap reference and NPN pass transistor architecture, enabling precise 1.5V output regulation across 0°C to 125°C ambient temperature. Its control loop is optimized for fast load-step response-critical for microprocessor supply rail integrity during dynamic current transients.
It integrates overcurrent protection with foldback current limiting and thermal shutdown that activates at ~150°C junction temperature. The device requires no external compensation and achieves stability with ≥10µF tantalum or ceramic output capacitors, per TI's recommended layout guidelines for the KTT package's exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.500 V ±30 mV (ensured over 0–3A load and 3–7V input; supports tight-tolerance logic rails) |
| Maximum Output Current | 3 A continuous (enables single-regulator solution for mid-power SoC cores or FPGA I/O banks) |
| Dropout Voltage | 1.3 V max at 3A (allows operation from 2.8V input, supporting battery-backed or low-headroom systems) |
| Line Regulation | 0.005% typical (0.2% max; ensures <75 µV output shift per 1V input change-critical for noise-sensitive analog subsystems) |
| Load Regulation | 0.05% typical (0.3% max; maintains ≤4.5 mV output deviation from no-load to full 3A load) |
| Ripple Rejection | 72 dB at 120 Hz (suppresses switching regulator ripple when used in hybrid power architectures) |
| Quiescent Current | 7–13 mA (low static consumption enables efficient standby operation without external enable control) |
Pinout & Package
Package: DDPAK/TO-263 (KTT), 3-lead surface-mount package with exposed thermal pad for enhanced PCB heat dissipation. Thermal resistance θJC = 0.65°C/W (control section) and 2.7°C/W (output section).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPUT (Pin 1) | Input voltage supply connection | Accepts 3–7V DC input; must be decoupled with ≥10µF capacitor near pin to minimize high-frequency impedance |
| OUTPUT (Pin 2) | Regulated 1.5V output terminal | Delivers up to 3A; connects directly to load and output capacitor; ties to exposed thermal pad for thermal conduction |
| GND (Pin 3) | Ground reference and thermal return | Common return for internal circuitry and thermal path; must be soldered to large copper pour for optimal thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Stabilizes within microseconds after 1–3A load steps-preserves voltage margin for Pentium®/PowerPC® processor cores |
| Integrated protection | Thermal shutdown + foldback current limiting prevent damage during overload or poor heatsinking conditions |
| Fixed 1.5V output | No external resistors required-reduces BOM count and layout area vs. adjustable regulators |
| Low-noise operation | 0.003% RMS output noise (relative to VOUT)-suitable for powering ADC references or RF bias rails |
| Stability with low-ESR caps | Guaranteed stable with ≥10µF tantalum or ceramic output capacitors-enables compact, high-reliability designs |
Applications
| Processor Core Supply | FPGA I/O Bank Power |
|---|---|
|
Use Scenario: Powers the 1.5V core rail of Intel Pentium® or PowerPC® microprocessors during burst-mode execution. IC Role / Device Role / Timing Role: Primary low-noise, high-current linear regulator delivering clean, tightly regulated voltage to CPU core. Use Value: Fast transient response prevents brownout during sudden current demand spikes, ensuring deterministic processor timing. |
Use Scenario: Supplies configurable 1.5V I/O banks on Xilinx or Intel FPGAs requiring stable voltage under varying interface loads. IC Role / Device Role / Timing Role: Point-of-load regulator providing isolated, low-ripple power to FPGA I/O banks with independent voltage domains. Use Value: 0.05% load regulation ensures signal integrity across all I/O standards (LVCMOS, SSTL) without level-shifter dependency. |
| Industrial PLC Logic Rail | Medical Sensor Signal Chain |
|
Use Scenario: Generates 1.5V logic supply for ARM-based programmable logic controllers operating in 0–70°C industrial enclosures. IC Role / Device Role / Timing Role: Fixed-output LDO replacing switching solutions where EMI sensitivity prohibits inductor-based conversion. Use Value: 72 dB ripple rejection eliminates conducted noise coupling into real-time control firmware execution paths. |
Use Scenario: Powers precision analog front-end (AFE) stages in portable medical sensors requiring ultra-low-noise biasing. IC Role / Device Role / Timing Role: Low-RMS-noise (0.003% of VOUT) regulator supplying ADC reference buffers and op-amp bias rails. Use Value: Sub-45 µV RMS noise floor preserves ENOB in 16-bit+ data acquisition systems without additional filtering. |
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 |
|---|---|---|---|
| LM1085IT-1.5/NOPB | TO-220 package, 3A rating, 1.3V dropout (typ), no RoHS exemption | Higher thermal resistance (θJA ≈ 50°C/W vs. KTT's ~40°C/W); requires larger heatsink in same ambient | Select when through-hole assembly or legacy footprint compatibility is required; verify thermal derating at 3A |
| TPS7A4701RGWR | 200mA max, 1.5V fixed, 300µV RMS noise, WQFN-20 package | Not a current-capability match-designed for ultra-low-noise analog bias, not power delivery | Use only for sub-200mA noise-critical analog rails; not suitable as direct functional replacement for LMS1587CS-1.5/NOPB |
Compared with LM1085IT-1.5/NOPB, the LMS1587CS-1.5/NOPB offers superior thermal performance in surface-mount form factor and RoHS-exempt lead finish for legacy industrial compliance; compared with TPS7A4701RGWR, it provides 15× higher output current but trades off ultra-low noise for power delivery capability.
Availability
LMS1587CS-1.5/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, FPGA I/O power, and industrial PLC logic rails requiring stable component supply with long lifecycle visibility and commercial-grade temperature support (0°C to 125°C).
Supply support for LMS1587CS-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 ICs, with decades of expertise in high-reliability linear regulation technology.
The LMS1587 series was designed specifically for low-voltage, high-current microprocessor and digital logic supply applications-emphasizing fast transient response, thermal robustness, and ease of use in space-constrained layouts.
FAQ
What is the maximum input voltage for LMS1587CS-1.5/NOPB?
The absolute maximum input-to-ground voltage for LMS1587CS-1.5/NOPB is 13V, but the recommended operating range is 3V to 7V. Exceeding 7V significantly increases power dissipation and thermal stress-especially at full 3A load-so design margins should maintain VIN ≤7V for reliable operation within the 0°C to 125°C junction temperature limit.
Does LMS1587CS-1.5/NOPB require an external capacitor for stability?
Yes, LMS1587CS-1.5/NOPB requires a minimum 10µF output capacitor (tantalum or ceramic) placed close to the OUTPUT and GND pins for guaranteed stability. The datasheet explicitly states this capacitor is "required for stability," and omitting it risks oscillation under load transients. Input capacitance is also recommended but not strictly mandatory for stability.
Can LMS1587CS-1.5/NOPB be paralleled for higher current?
No-LMS1587CS-1.5/NOPB is not designed for parallel operation. Its internal current-limiting and thermal protection are per-device, and mismatched dropout voltages between units would cause uneven current sharing. For >3A requirements, select the 5A-rated LMS1585ACS-1.5/NOPB or implement a discrete current-sharing scheme with external components.
What is the thermal pad soldering requirement for LMS1587CS-1.5/NOPB?
The exposed thermal pad on the LMS1587CS-1.5/NOPB (KTT package) must be soldered to a dedicated PCB copper pour connected to GND. TI recommends ≥60% solder paste coverage, filled or tented vias under the pad, and adherence to SLMA002/SLMA004 layout guidelines. Inadequate thermal pad soldering degrades θJA by >20°C/W and risks thermal shutdown at rated load.
Is LMS1587CS-1.5/NOPB pin-compatible with LT1587-1.5?
Yes-LMS1587CS-1.5/NOPB is specified by TI as a direct replacement for Linear Technology's LT1587-1.5 in both TO-220 (NDE) and TO-263 (KTT) packages. Pin assignments (INPUT, OUTPUT, GND), electrical specs, and thermal characteristics align per manufacturer documentation, enabling drop-in substitution where RoHS exemptions or TI-sourced supply chains are preferred.
LMS1587CS-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):
- 1.3V @ 3A
- Current - Output:
- 3A
- 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:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-3)
LMS1587CS-1.5/NOPB FAQ
1.How can I place an order for LMS1587CS-1.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS1587CS-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 LMS1587CS-1.5/NOPB reliable?
The price and inventory of LMS1587CS-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 LMS1587CS-1.5/NOPB is usually 5 days.
3.What payment methods are accepted for LMS1587CS-1.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS1587CS-1.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS1587CS-1.5/NOPB?
LMS1587CS-1.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS1587CS-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 LMS1587CS-1.5/NOPB?
For technical support, including LMS1587CS-1.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS1587CS-1.5/NOPB requirements.
6.How does Aetrix verify that LMS1587CS-1.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LMS1587CS-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 LMS1587CS-1.5/NOPB meets industry standards.
7.What is the process for return or replacement of LMS1587CS-1.5/NOPB?
All LMS1587CS-1.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMS1587CS-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 LMS1587CS-1.5/NOPB part is unused and in its original packaging.
Return procedure for LMS1587CS-1.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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