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Analog Devices Inc. LT1580IQ#TRPBF
- Part No.:
- LT1580IQ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LT1580IQ#TRPBF.pdf
- Description:
- IC REG CONV PENTIUM 1OUT 5DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,541
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Product details
Overview
LT1580IQ#TRPBF from Analog Devices (formerly Linear Technology) is a 7A fixed-output 2.5V low-dropout linear regulator with dual-supply architecture, remote sense capability, 1mV load regulation (100mA–7A), and 540mV dropout at full load. It delivers stable microprocessor core power on motherboards where both 3.3V and 5V rails are available.
For engineers reviewing the LT1580IQ#TRPBF datasheet, LT1580IQ#TRPBF pinout, LT1580IQ#TRPBF application, or LT1580IQ#TRPBF equivalent, this page provides verified technical context, package mapping, real-world transient response behavior, thermal design guidance, and validated alternative options for 2.5V/7A high-current LDO replacement.
Technical Context
The LT1580IQ#TRPBF uses a dual-input architecture: VPOWER supplies the NPN pass transistor collector (output current path), while VCONTROL powers the control circuitry and provides base drive - enabling saturation operation and sub-550mV dropout at 7A. Its internal 1.25V reference and ratiometric divider yield ±0.6% initial output accuracy at 25°C.
Remote SENSE pin enables Kelvin sensing at the load, reducing effective load regulation error to <1mV across 100mA–7A. The ADJ pin is exposed even on the fixed 2.5V variant, allowing 0.1–1µF bypassing to improve transient response and ripple rejection (60–80dB at 1kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.500 V ±0.6% (25°C), ±1% over –40°C to 125°C - ensures tight core voltage compliance for Pentium/PowerPC processors. |
| Max Output Current | 7 A continuous - supports high-current CPU core loads without derating under proper heatsinking. |
| Dropout Voltage | 540 mV at 7A (VPOWER–VOUT), 1.30 V at 7A (VCONTROL–VOUT) - enables efficient 3.3V-to-2.5V conversion with minimal headroom. |
| Load Regulation | ≤1 mV (100mA → 7A, measured at SENSE) - eliminates voltage droop at the processor die due to PCB trace resistance. |
| Ripple Rejection | 60–80 dB @ 1 kHz - suppresses switching noise from upstream DC/DC converters feeding VPOWER or VCONTROL. |
| Thermal Resistance | Junction-to-case: 2.7°C/W (power section) - mandates external heatsink for >3W dissipation in continuous operation. |
| Control Pin Current | 60–120 mA at 7A load - scales ~1% of IOUT and must be supplied by a clean, low-impedance 5V rail. |
Pinout & Package
LT1580IQ#TRPBF is housed in a 5-lead plastic DD (TO-220 compatible) package with exposed tab (thermal pad) connected to the power transistor collector (VPOWER). Pin 1 = SENSE, Pin 2 = ADJ, Pin 3 = VOUT, Pin 4 = VCONTROL, Pin 5 = VPOWER. The tab is electrically active and must be isolated if mounted to grounded heatsinks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE (Pin 1) | Positive reference input | Kelvin sense point - connect directly to load VDD to nullify PCB IR drop; enables <1mV load regulation. |
| ADJ (Pin 2) | Reference negative terminal | Exposed on fixed 2.5V version to allow 0.1–1µF bypass capacitor, improving transient response and ripple rejection. |
| VOUT (Pin 3) | Main power output | Delivers regulated 2.5V/7A; connects to bulk capacitance (≥330µF OS-CON + 100µF TANT ×7) near load. |
| VCONTROL (Pin 4) | Control circuit supply | Must be ≥1.0V above VOUT (min 3.5V for 2.5V output); supplies ~1% of IOUT as base drive current. |
| VPOWER (Pin 5) | Pass transistor collector | High-current input (3.3V typical); voltage must exceed VOUT by ≥0.1V (up to 0.8V at 7A) to maintain regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply architecture | Separates power delivery (VPOWER) and control drive (VCONTROL), enabling 540mV dropout at 7A - unattainable with single-supply LDOs. |
| Remote SENSE with Kelvin connection | Eliminates regulation error from PCB trace resistance; maintains <1mV output variation from 100mA to 7A at the load. |
| Exposed ADJ pin on fixed-voltage variant | Allows external 0.1–1µF capacitor to reduce output voltage overshoot/undershoot during 7A load transients. |
| Guaranteed 1% total output accuracy | ±0.6% initial tolerance + <0.4% temp/load drift over –40°C to 125°C - meets Pentium/PowerPC core voltage spec without trimming. |
| Integrated thermal & current limiting | Protects against sustained overload; power section rated to 150°C junction, control section to 125°C - enables robust motherboard deployment. |
Applications
| Microprocessor Core Supply | Post-Regulator for Switching Supplies |
|---|---|
|
Use Scenario: Generating 2.5V/7A for Pentium® processors operating at 90–166MHz on ATX motherboards with available 3.3V and 5V rails. IC Role / Device Role / Timing Role: Primary core voltage regulator delivering tightly regulated DC power with sub-mV load step response. Use Value: Enables reliable CPU operation without undershoot-induced crashes during 7A load transients, eliminating need for oversized bulk capacitance. |
Use Scenario: Cleaning ripple from a 3.3V buck converter output before feeding a noise-sensitive 2.5V logic domain. IC Role / Device Role / Timing Role: Low-noise linear post-regulator suppressing switching artifacts above 1kHz. Use Value: Achieves 60–80dB ripple rejection at 1kHz, meeting stringent analog/RF subsystem noise requirements. |
| High-Current FPGA I/O Bank Supply | Portable Pentium® Processor Power |
|
Use Scenario: Providing 2.5V/7A to multiple FPGA I/O banks requiring simultaneous switching noise immunity. IC Role / Device Role / Timing Role: High-current, low-ESR-capacitor-compatible LDO with fast transient recovery. Use Value: Maintains <±1% output stability during 5A/ns load steps using only 330µF OS-CON + ceramic decoupling - reduces BOM cost vs. alternatives. |
Use Scenario: Converting 3.3V system rail to 2.5V for portable Pentium® processors where thermal headroom is constrained. IC Role / Device Role / Timing Role: Thermally optimized LDO with 2.7°C/W junction-to-case resistance for compact heatsink integration. Use Value: Delivers full 7A at ambient ≤60°C with standard TO-220 heatsink, avoiding forced-air cooling in space-constrained laptops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3085EDE-2.5#TRPBF | Monolithic 7A LDO with integrated MOSFET; 300mV dropout at 7A; requires only single input supply. | Better suited for space-constrained designs lacking dual supply rails; no VCONTROL pin needed. | Select when board lacks dedicated 5V control rail or requires simplified layout - but verify thermal performance at 7A. |
| TPS7A8300RGRT | 6A LDO with 1.1V dropout at 6A; single-supply operation; 1% initial accuracy; no remote sense. | Lower current rating and no Kelvin sensing - acceptable for non-critical 2.5V loads with short trace lengths. | Choose for cost-sensitive industrial applications where <1mV load regulation is not required and 6A suffices. |
Compared with LT1580IQ#TRPBF, LTC3085EDE-2.5#TRPBF eliminates the dual-supply complexity but trades off remote sensing capability, while TPS7A8300RGRT offers lower dropout in single-rail systems but cannot match the <1mV load regulation or 7A capacity critical for CPU cores.
Availability
LT1580IQ#TRPBF is available at Aetrix Electronics and suitable for microprocessor core supplies, FPGA I/O banks, high-current post-regulation, and portable computing power systems requiring stable component supply across long production lifecycles.
Supply support for LT1580IQ#TRPBF 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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LT® series.
The LT1580 product line was designed specifically for high-current, low-dropout microprocessor core regulation in desktop and portable computing platforms - prioritizing transient response, remote sensing, and dual-rail efficiency.
FAQ
What is the minimum input voltage required for LT1580IQ#TRPBF to regulate 2.5V at 7A?
The LT1580IQ#TRPBF requires two inputs: VPOWER must exceed VOUT by ≥0.70V (i.e., ≥3.2V) and VCONTROL must exceed VOUT by ≥1.15V (i.e., ≥3.65V) at 7A and 25°C. Both conditions must be met simultaneously for stable 2.5V regulation - typical implementation uses 3.3V for VPOWER and 5V for VCONTROL.
Can LT1580IQ#TRPBF operate from a single supply?
Yes, LT1580IQ#TRPBF can operate with VPOWER and VCONTROL tied together, functioning as a conventional single-supply LDO. However, dropout increases to match LT1584-level performance (~1.1V at 7A), losing the key advantage of its dual-supply architecture. Use only when dual rails are unavailable.
Why does LT1580IQ#TRPBF expose the ADJ pin despite being a fixed 2.5V device?
The ADJ pin is exposed on LT1580IQ#TRPBF to allow external capacitor bypassing (0.1–1µF to ground), which improves transient response and ripple rejection. This feature is unique to the LT1580 family - most fixed-output LDOs omit ADJ access, limiting dynamic performance optimization.
How does remote sensing work on LT1580IQ#TRPBF, and what is its practical benefit?
LT1580IQ#TRPBF uses the SENSE pin to monitor voltage directly at the load, closing the regulation loop around PCB trace resistance. This reduces effective load regulation error to <1mV from 100mA to 7A - preventing processor brownouts caused by IR drop in 5–10mΩ board traces carrying 7A.
What thermal management is required for LT1580IQ#TRPBF at full 7A load?
At 7A with 3.3V input and 2.5V output, LT1580IQ#TRPBF dissipates ~5.6W in the pass transistor. With θJA = 50°C/W (Q package), ambient must stay below ~55°C without heatsinking. A 2.5°C/W heatsink reduces junction rise to ~17°C - keeping TJ < 125°C at 70°C ambient. Mount tab with thermal compound and electrical isolation if grounded.
LT1580IQ#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, Intel Pentium®
- Voltage - Input:
- 1.79V ~ 6V
- Number of Outputs:
- 1
- Voltage - Output:
- 1.25V ~ 4.65V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-5
LT1580IQ#TRPBF FAQ
1.How can I place an order for LT1580IQ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1580IQ#TRPBF 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 LT1580IQ#TRPBF reliable?
The price and inventory of LT1580IQ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1580IQ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1580IQ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1580IQ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1580IQ#TRPBF?
LT1580IQ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1580IQ#TRPBF 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 LT1580IQ#TRPBF?
For technical support, including LT1580IQ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1580IQ#TRPBF requirements.
6.How does Aetrix verify that LT1580IQ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1580IQ#TRPBF 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 LT1580IQ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1580IQ#TRPBF?
All LT1580IQ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1580IQ#TRPBF, 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 LT1580IQ#TRPBF part is unused and in its original packaging.
Return procedure for LT1580IQ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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