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Texas Instruments LMS1587IS-1.5/NOPB
- Part No.:
- LMS1587IS-1.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
LMS1587IS-1.5/NOPB.pdf
- Description:
- IC REG LIN 1.5V 3A DDPAK/TO263-3
- Quantity:
- Payment:
- Shipping:
Inventory:390
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Product details
Overview
LMS1587IS-1.5/NOPB from Texas Instruments is a fixed-output 1.5V, 3A low-dropout linear regulator in a TO-263 (KTT) package, featuring 1.2V typical dropout at full load, fast transient response, and integrated thermal shutdown and current limiting - deployed in Pentium® and PowerPC® microprocessor core supplies.
For engineers reviewing the LMS1587IS-1.5/NOPB datasheet, LMS1587IS-1.5/NOPB pinout, LMS1587IS-1.5/NOPB application, or LMS1587IS-1.5/NOPB equivalent, key selection criteria include industrial-grade temperature range (−40°C to 125°C), output voltage accuracy (±1.0% over load/temperature), ripple rejection (60 dB at 120 Hz), and compatibility with 10 µF minimum output capacitance for stability.
Technical Context
The LMS1587IS-1.5/NOPB implements a zener-trimmed bandgap reference with internal resistor divider for fixed 1.5V output, eliminating external feedback components. Its control loop delivers fast transient response critical for microprocessor VCC rails during dynamic load steps.
Thermal regulation (0.003%/W) and junction-to-case thermal resistance (2.7°C/W for output section) enable stable operation under sustained 3A loads without external heatsinking in moderate ambient conditions. Current limiting triggers at 3.1A minimum, with thermal shutdown activating at 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.500 V ±1.0% (ensured across −40°C to 125°C, 0–3A load) |
| Max Output Current | 3 A continuous (with adequate heatsinking and input voltage margin) |
| Dropout Voltage | 1.3 V max at 3A (enables operation with VIN as low as 2.8V for 1.5V output) |
| Ripple Rejection | 60 dB at 120 Hz (suppresses switching noise from upstream DC/DC converters) |
| Line Regulation | 0.005% typical (0.2% max; ensures stable output despite input rail variation) |
| Load Regulation | 0.05% typical (0.3% max; maintains tight voltage under full load step changes) |
| Quiescent Current | 7–13 mA (low no-load power draw ideal for always-on subsystems) |
| Operating Temp | −40°C to 125°C (industrial-grade qualification for embedded computing environments) |
Pinout & Package
Package: DDPAK/TO-263 (KTT), 3-lead surface-mount package with exposed thermal pad for enhanced heat dissipation. Pin 1 = INPUT, Pin 2 = OUTPUT, Pin 3 = GND (fixed-output variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPUT (Pin 1) | Unregulated input supply connection | Accepts 3V to 7V input; must maintain ≥1.3V headroom above 1.5V output for regulation |
| OUTPUT (Pin 2) | Regulated 1.5V output node | Delivers up to 3A; requires ≥10 µF output capacitor (tantalum or ceramic) for stability |
| GND (Pin 3) | Power ground reference | Common return path for input, output, and internal circuitry; ties to thermal pad for thermal conduction |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Stabilizes within microseconds after 1A load step - prevents microprocessor brownouts during burst activity |
| Integrated protection | Current limiting (3.1A min) + thermal shutdown (150°C) - eliminates need for external fault management circuitry |
| Low-noise regulation | 0.003% RMS output noise (10Hz–10kHz) - suitable for noise-sensitive analog subsystems sharing same rail |
| High PSRR | 60–72 dB ripple rejection across 120 Hz–1 kHz - enables clean LDO output even when fed from noisy switchers |
| Industrial temp grade | −40°C to 125°C operation - qualified for automotive engine bay, industrial PLC, and telecom base station applications |
Applications
| Pentium® Processor Core Supply | PowerPC® System-on-Chip Rail |
|---|---|
Use Scenario: Powers CPU core logic requiring tightly regulated 1.5V at up to 3A with minimal voltage deviation during instruction fetch bursts. IC Role / Device Role / Timing Role: Primary low-noise post-regulator delivering stable VCC to microprocessor die, replacing higher-dropout alternatives. Use Value: 1.2V dropout enables use of 3.3V intermediate bus, reducing system-level power conversion stages and BOM count. | Use Scenario: Supplies memory interface and I/O subsystems in PowerPC-based networking equipment operating in extended temperature environments. IC Role / Device Role / Timing Role: Fixed-output LDO providing clean 1.5V for DDR termination and SerDes biasing circuits. Use Value: 60 dB ripple rejection suppresses switching noise from adjacent DC/DC converters, preventing timing jitter in high-speed interfaces. |
| Industrial FPGA Configuration Rail | Embedded Controller Core Voltage |
Use Scenario: Delivers 1.5V to FPGA configuration logic and auxiliary I/O banks in programmable logic controllers with wide ambient temperature swings. IC Role / Device Role / Timing Role: Industrial-grade LDO ensuring reliable startup and operation across −40°C to 125°C ambient. Use Value: Thermal shutdown and current limiting prevent latch-up or damage during field-repair short-circuit events. | Use Scenario: Powers ARM Cortex-M or RISC-V microcontroller cores in edge IoT gateways where standby current and thermal performance are critical. IC Role / Device Role / Timing Role: Low-quiescent-current (7–13 mA) LDO maintaining 1.5V core rail during sleep/wake cycles. Use Value: 0.003% RMS noise minimizes ADC reference error and improves sensor signal integrity in mixed-signal designs. |
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 | Same 1.5V/3A rating but commercial temp range (0°C to 125°C); higher 1.3V dropout; no industrial-grade qualification | Suitable only for non-extended-temperature consumer or lab equipment | Select if cost sensitivity outweighs industrial temp requirement and board space allows TO-220 mounting |
| TPS7A8300RGRT | 1.5V/3A adjustable LDO with ultra-low 20µVRMS noise and 0.5% accuracy, but requires external feedback resistors and has 0.6V dropout | Better for RF/analog-heavy systems needing sub-100µV noise; not drop-in due to pinout and external components | Choose when noise performance is primary constraint and design can accommodate 5-pin QFN layout and resistor network |
Compared with LM1085IT-1.5/NOPB, LMS1587IS-1.5/NOPB provides guaranteed −40°C operation and tighter line/load regulation; versus TPS7A8300RGRT, it offers simpler fixed-voltage implementation and TO-263 thermal performance at the expense of noise floor and accuracy.
Availability
LMS1587IS-1.5/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and telecommunications infrastructure requiring stable component supply with long-term lifecycle support.
Supply support for LMS1587IS-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 company specializing in analog, embedded processing, and connectivity technologies with over 90 years of innovation in power management ICs.
The LMS1587 series was designed specifically for high-current, low-dropout regulation in microprocessor and DSP core supplies, emphasizing fast transient response and robust thermal protection in compact surface-mount packages.
FAQ
What is the maximum input voltage for LMS1587IS-1.5/NOPB?
The absolute maximum input-to-ground voltage for LMS1587IS-1.5/NOPB is 13V, but functional operation is limited to 3V–7V per the Electrical Characteristics table. Exceeding 7V reduces power dissipation margin and risks thermal shutdown under full 3A load; operation above 7V is not characterized or guaranteed.
Does LMS1587IS-1.5/NOPB require an external capacitor on the ADJ pin?
No - LMS1587IS-1.5/NOPB is a fixed-output variant with internal resistor divider; the ADJ pin is not present. Only adjustable versions (e.g., LMS1587IS-ADJ/NOPB) expose this terminal. This simplifies layout and eliminates tuning errors associated with external feedback networks.
Can LMS1587IS-1.5/NOPB be used in parallel for higher current?
No - LMS1587IS-1.5/NOPB lacks built-in current-sharing capability. Parallel operation without external ballast resistors or active current-balancing circuitry will cause unequal load distribution and potential thermal runaway. For >3A requirements, select the 5A-rated LMS1585AIS-1.5/NOPB instead.
What is the minimum output capacitance required for stability with LMS1587IS-1.5/NOPB?
LMS1587IS-1.5/NOPB requires a minimum 10 µF output capacitor, specified as "required for stability" in the Typical Application diagram. Tantalum or ceramic capacitors meeting ESR specifications (0.1–1 Ω) are acceptable; aluminum electrolytic types may cause instability due to higher ESR tolerance drift.
Is LMS1587IS-1.5/NOPB RoHS compliant and lead-free?
Yes - LMS1587IS-1.5/NOPB carries the /NOPB suffix indicating Pb-Free (RoHS Exempt) construction per TI's packaging documentation. It uses Sn (tin) lead finish and complies with JEDEC MSL Level-3 moisture sensitivity classification for surface-mount reflow processes.
LMS1587IS-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:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-3)
LMS1587IS-1.5/NOPB FAQ
1.How can I place an order for LMS1587IS-1.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS1587IS-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 LMS1587IS-1.5/NOPB reliable?
The price and inventory of LMS1587IS-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 LMS1587IS-1.5/NOPB is usually 5 days.
3.What payment methods are accepted for LMS1587IS-1.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS1587IS-1.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS1587IS-1.5/NOPB?
LMS1587IS-1.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS1587IS-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 LMS1587IS-1.5/NOPB?
For technical support, including LMS1587IS-1.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS1587IS-1.5/NOPB requirements.
6.How does Aetrix verify that LMS1587IS-1.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LMS1587IS-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 LMS1587IS-1.5/NOPB meets industry standards.
7.What is the process for return or replacement of LMS1587IS-1.5/NOPB?
All LMS1587IS-1.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMS1587IS-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 LMS1587IS-1.5/NOPB part is unused and in its original packaging.
Return procedure for LMS1587IS-1.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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