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Analog Devices Inc. LT1587CT-3.6#PBF
- Part No.:
- LT1587CT-3.6#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-3
- Datasheet:
-
LT1587CT-3.6#PBF.pdf
- Description:
- IC REG LINEAR 3.6V 3A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:142
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Product details
Overview
LT1587CT-3.6#PBF from Analog Devices (formerly Linear Technology) is a 3A, 3.6V fixed-output low dropout linear regulator in TO-220 package, optimized for microprocessor core supplies requiring fast transient response and input voltage below 7V. It delivers guaranteed 3A output with 1.3V typical dropout at 3A, ±2% output voltage accuracy over temperature, and 60–72dB ripple rejection at 120Hz - used in Pentium™ and PowerPC™ processor power rails.
For engineers reviewing the LT1587CT-3.6#PBF datasheet, LT1587CT-3.6#PBF pinout, LT1587CT-3.6#PBF application, or LT1587CT-3.6#PBF equivalent, key selection criteria include dropout voltage at full load, thermal resistance (θJA = 50°C/W), output stability with ≤10µF tantalum, and compatibility with 2.5V–3.6V logic supply requirements in space-constrained industrial embedded systems.
Technical Context
The LT1587CT-3.6#PBF implements a three-terminal monolithic architecture with trimmed reference voltage (1.25V ±2%), internal current limiting (3.1–3.75A), and on-chip thermal shutdown at ~150°C junction temperature. Its control loop is frequency-compensated to remain stable with low-ESR capacitors as small as 10µF solid tantalum.
Unlike the LT1584/LT1585 variants, the LT1587CT-3.6#PBF features flat current limiting (no foldback) and operates within a strict 4.75V–7V input range. It shares pin compatibility with LT1085 but improves dropout by ~150mV and transient response by >2× under 3A load steps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.6V ±2% (3.474V–3.672V) across 0–3A load and –40°C to 125°C, enabling precise 3.6V logic rail generation without external feedback. |
| Max Output Current | 3A continuous (guaranteed at TJ ≥ 25°C); supports high-current microprocessor core loads without derating in standard TO-220 heatsink configurations. |
| Dropout Voltage | 1.15V–1.30V at 3A (ΔVOUT = 1%), allowing operation with VIN as low as 4.75V - critical for battery-backed or post-regulated 5V supply designs. |
| Ripple Rejection | 60–72dB at 120Hz with 25µF tantalum output cap - suppresses switching noise from upstream DC/DC converters feeding FPGA or DSP cores. |
| Thermal Resistance | θJA = 50°C/W (TO-220, soldered to 0.5 in² copper), enabling 18W max power dissipation before thermal shutdown activates. |
| Quiescent Current | 8–13mA at VIN = 5.25V - low enough for always-on subsystems while maintaining fast wake-up response during CPU burst loads. |
| Load Regulation | 0.05% typical (0–3A), ensuring <±1.8mV output shift across full load - meets tight tolerance requirements of 3.6V I/O interfaces and analog subsystems. |
Pinout & Package
LT1587CT-3.6#PBF uses the industry-standard 3-lead plastic TO-220 package (T package) with electrically isolated tab. The tab is connected to VOUT and serves as the primary thermal path to heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input Supply Terminal | Accepts 4.75V–7V DC; requires ≥10µF input capacitance (tantalum or ceramic) for EMI filtering and transient energy storage. |
| VOUT (Pin 2) | Regulated Output Terminal | Delivers 3.6V ±2% at up to 3A; tab is internally bonded to this pin - must be thermally coupled to heatsink and electrically isolated if system ground is not at VOUT potential. |
| GND (Pin 3) | Ground Reference Terminal | Provides Kelvin-sense return for fixed-output regulation; connects directly to load ground to minimize parasitic IR drop in high-accuracy applications. |
Key Features
| Feature | Design Value |
|---|---|
| Fast Transient Response | Stabilizes within <10µs after 3A load step - eliminates need for >1300µF bulk capacitance required by older regulators in Pentium-class CPU supplies. |
| Guaranteed Dropout at Full Load | 1.30V max at 3A ensures reliable operation even with marginal input margins (e.g., 5V rail sagging to 4.8V under system load). |
| On-Chip Thermal Limiting | Shuts down at ~150°C junction temperature and auto-restarts upon cooling - protects against sustained overload without external circuitry. |
| Trimmed Current Limit | 3.1–3.75A range prevents destructive overcurrent while maintaining safe-area operation across input voltage variations. |
| Low ESR Capacitor Stability | Stable with 10µF solid tantalum (ESR <1Ω) - enables compact, high-frequency decoupling near processor packages without ceramic+electrolytic hybrids. |
Applications
| Pentium™ Processor Core Supply | PowerPC™ I/O Voltage Rail |
|---|---|
Use Scenario: Powers Intel Pentium™ microprocessor core requiring 3.6V ±2% at up to 3A with sub-50mV transient deviation during 3.8A load steps. IC Role / Device Role / Timing Role: Primary low-noise linear regulator providing clean, fast-response DC bias for CPU execution units and cache subsystems. Use Value: Eliminates need for >1300µF output capacitance while meeting Intel's <50mV transient spec - reduces PCB area and BOM cost vs legacy solutions. |
Use Scenario: Supplies IBM PowerPC™ processor I/O banks operating at 3.6V with tight load regulation and immunity to switching noise from adjacent DC/DC converters. IC Role / Device Role / Timing Role: Post-regulator for noisy 5V intermediate bus, rejecting ripple from upstream buck converters feeding memory controllers. Use Value: 72dB ripple rejection at 120Hz ensures <36µV RMS noise on 3.6V rail - prevents timing jitter in high-speed SerDes links. |
| Industrial PLC Logic Supply | Battery-Powered Test Equipment |
Use Scenario: Generates stable 3.6V for FPGA configuration and real-time I/O logic in programmable logic controllers exposed to wide ambient temperatures (–40°C to 85°C). IC Role / Device Role / Timing Role: Main system regulator delivering regulated power to digital logic, ADC references, and communication peripherals. Use Value: 0.5% temperature stability and 0.05% load regulation maintain timing margin integrity across temperature cycling and varying I/O pin counts. |
Use Scenario: Powers portable oscilloscope front-end analog circuitry from a 2-cell Li-ion battery (6V–8.4V), requiring low dropout to extend runtime below 5V. IC Role / Device Role / Timing Role: Low-noise linear regulator supplying precision op-amps and 12-bit ADCs with minimal thermal drift. Use Value: 1.15V dropout at 3A enables >1.5 hours additional runtime vs higher-dropout alternatives when battery voltage drops to 4.9V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1585CT-3.6#PBF | Higher 4.6A output current rating; 1.4V max dropout at 4.6A; θJA = 50°C/W same package. | Supports higher-current microprocessor variants (e.g., Pentium Pro); requires larger heatsink for same power dissipation. | Select when load exceeds 3A or future-proofing for higher-power derivatives is needed; pin-compatible drop-in replacement. |
| LM350KTP/NOPB | 3A adjustable regulator; 2V typical dropout; no guaranteed 3.6V accuracy - requires external resistors; 72dB ripple rejection only at 100Hz. | Suitable for lab bench supplies or non-critical analog rails where voltage adjustability matters more than precision or speed. | Choose only if 3.6V accuracy and fast transient response are not required; not pin-compatible - needs layout change. |
Compared with LT1585CT-3.6#PBF, the LT1587CT-3.6#PBF trades 1.6A current headroom for lower thermal mass and tighter 3A current limit calibration - ideal for cost-sensitive, space-constrained 3.6V logic rails. Versus LM350KTP/NOPB, it delivers factory-trimmed 3.6V accuracy and 2× faster transient recovery without external components.
Availability
LT1587CT-3.6#PBF is available at Aetrix Electronics and suitable for industrial PLCs, test equipment, embedded microprocessor systems, and battery-powered instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for LT1587CT-3.6#PBF 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
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1587 series belongs to Linear Technology's precision linear regulator product line, designed specifically for low-voltage, high-transient microprocessor and DSP power applications where dropout voltage, thermal performance, and output accuracy are critical.
FAQ
What is the maximum input voltage for LT1587CT-3.6#PBF?
The absolute maximum input voltage for LT1587CT-3.6#PBF is 7V. Operation above this level risks permanent damage to internal transistors, as the device lacks overvoltage protection circuitry. For reliable 3.6V output, the recommended input range is 4.75V to 7V - validated across all temperature grades and load conditions per the official datasheet.
Does LT1587CT-3.6#PBF require an external capacitor for stability?
Yes, LT1587CT-3.6#PBF requires a minimum 10µF solid tantalum or 100µF aluminum electrolytic capacitor on the output for guaranteed stability. The datasheet specifies 10µF tantalum (with ESR <1Ω) as sufficient for all operating conditions - smaller values may cause oscillation under heavy transient loads.
What is the thermal shutdown threshold of LT1587CT-3.6#PBF?
The LT1587CT-3.6#PBF activates thermal shutdown when its junction temperature reaches approximately 150°C. The device remains latched off until junction temperature falls by ~15°C, then automatically resumes regulation - a feature confirmed in the "Protection Diodes" and "Thermal Considerations" sections of the datasheet.
Can LT1587CT-3.6#PBF be used in parallel for higher current?
No, LT1587CT-3.6#PBF is not designed for parallel operation. Its output voltage tolerance (±2%) and load regulation (0.05%) make current sharing unbalanced without external ballasting resistors or active current-sharing circuitry - which negates the simplicity advantage of the part. Use LT1585CT-3.6#PBF instead for 4.6A single-device solutions.
Is LT1587CT-3.6#PBF RoHS compliant and lead-free?
Yes, LT1587CT-3.6#PBF carries the #PBF suffix, indicating it is lead-free and RoHS compliant per Analog Devices' material declarations. The TO-220 package uses matte tin plating over copper leadframe, with halogen-free molding compound - verified in the official "Package/Order Information" section of the datasheet.
LT1587CT-3.6#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 3.6V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 72dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
LT1587CT-3.6#PBF FAQ
1.How can I place an order for LT1587CT-3.6#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1587CT-3.6#PBF 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 LT1587CT-3.6#PBF reliable?
The price and inventory of LT1587CT-3.6#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1587CT-3.6#PBF is usually 5 days.
3.What payment methods are accepted for LT1587CT-3.6#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1587CT-3.6#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1587CT-3.6#PBF?
LT1587CT-3.6#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1587CT-3.6#PBF 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 LT1587CT-3.6#PBF?
For technical support, including LT1587CT-3.6#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1587CT-3.6#PBF requirements.
6.How does Aetrix verify that LT1587CT-3.6#PBF is sourced from the original manufacturer or authorized distributors?
All LT1587CT-3.6#PBF 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 LT1587CT-3.6#PBF meets industry standards.
7.What is the process for return or replacement of LT1587CT-3.6#PBF?
All LT1587CT-3.6#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1587CT-3.6#PBF, 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 LT1587CT-3.6#PBF part is unused and in its original packaging.
Return procedure for LT1587CT-3.6#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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