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Analog Devices Inc. LT1580IT7-2.5#06PBF
- Part No.:
- LT1580IT7-2.5#06PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- TO-220-7
- Datasheet:
-
LT1580IT7-2.5#06PBF.pdf
- Description:
- IC REG CONV PENTIUM 1OUT TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,977
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Product details
Overview
LT1580IT7-2.5#06PBF 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 using separate 3.3V power and 5V control rails.
For engineers reviewing the LT1580IT7-2.5#06PBF datasheet, LT1580IT7-2.5#06PBF pinout, LT1580IT7-2.5#06PBF application, or LT1580IT7-2.5#06PBF equivalent, key selection criteria include guaranteed 2.5V ±0.6% initial accuracy, Kelvin-sense-enabled load regulation, dual-rail dropout optimization, thermal-limited 7A continuous output, and T7-package thermal resistance of 0.65°C/W (control) / 2.70°C/W (power).
Technical Context
The LT1580IT7-2.5#06PBF uses a two-input architecture: VPOWER supplies the NPN pass transistor collector (min ΔV = 0.10–0.80V), while VCONTROL powers the control circuitry (min ΔV = 1.00–1.35V). This enables saturation drive and reduces dropout vs. single-supply LDOs.
It features dedicated SENSE and ADJ pins for remote voltage sensing and transient response enhancement via external capacitor (0.1–1µF), plus internal current/thermal limiting, no supply sequencing issues, and guaranteed 1% output accuracy over –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.500 V ±0.6% (25°C), ±0.75% (–40°C to 125°C) |
| Max Output Current | 7 A continuous, with thermal foldback above 12W dissipation |
| Dropout Voltage | 540 mV at 7A (VPOWER–VOUT), 1.30 V at 7A (VCONTROL–VOUT) |
| Load Regulation | <1 mV (100mA → 7A step, measured at SENSE pin) |
| Line Regulation | ≤3 mV (VCONTROL = 3.65–12V, VPOWER = 3–5.5V) |
| Ripple Rejection | 60–80 dB (1 VP-P, 100 Hz–10 kHz, 4A load) |
| Thermal Resistance | 0.65°C/W (junction-to-case, control section); 2.70°C/W (power section) |
Pinout & Package
LT1580IT7-2.5#06PBF is housed in a 7-lead plastic TO-220 (T7) package with exposed tab (thermal path to heatsink). Pin 1 is SENSE, Pin 2 is ADJ, Pin 3 is VOUT, Pin 4 is VCONTROL, Pin 5 is GND, Pin 6 is VPOWER, Pin 7 is NC. The tab is electrically connected to the power transistor emitter (output ground reference).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE (Pin 1) | Positive Kelvin sense input | Connects directly to load high-side for true remote voltage regulation; eliminates PCB trace IR drop impact on output accuracy |
| ADJ (Pin 2) | Reference node for internal divider | Enables transient response improvement via 0.1–1µF bypass capacitor; brought out even on fixed 2.5V version |
| VOUT (Pin 3) | Main power output | Delivers regulated 2.5V up to 7A; connects to load anode or bulk capacitor positive terminal |
| VCONTROL (Pin 4) | Control circuit supply | Provides bias and drive current (~1% of IOUT) to NPN pass transistor; must exceed VOUT by ≥1.0V |
| GND (Pin 5) | Reference return for feedback network | Bottom of internal resistor divider; ties to system ground near load cathode for optimal sensing |
| VPOWER (Pin 6) | Pass transistor collector supply | Supplies load current path; voltage must exceed VOUT by ≥0.10V (light load) to ≥0.80V (7A) |
| NC (Pin 7) | No connect | Not internally bonded; left floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Remote Kelvin sensing | Enables sub-millivolt load regulation at point-of-load by closing feedback loop across PCB traces |
| Dual-supply architecture | Separates control logic (VCONTROL) and power path (VPOWER) to achieve <0.6V dropout at 7A |
| ADJ pin accessibility | Allows external capacitor to reduce high-frequency output impedance and improve step-load recovery |
| Guaranteed 1% accuracy | Maintains 2.5V output within ±1% over full temperature (-40°C to 125°C) and load (0–7A) range |
| No sequencing dependency | Prevents unregulated turn-on: output only activates when both VCONTROL and VPOWER are valid |
Applications
| Microprocessor Core Supply | Post-Regulator for Switching Supplies |
|---|---|
Use Scenario: Generating 2.5V core voltage for Pentium® processors operating at 90–166MHz on ATX motherboards with available 3.3V and 5V rails. IC Role / Device Role / Timing Role: Primary linear regulator delivering tightly regulated DC power with fast transient response to CPU die. Use Value: Eliminates need for large bulk capacitance by achieving <1mV load regulation and 60–80dB ripple rejection at 4A. | Use Scenario: Tightening output of a 3.3V buck converter feeding a 2.5V FPGA I/O bank requiring ultra-low noise and zero sequencing risk. IC Role / Device Role / Timing Role: Low-noise post-regulator suppressing switching ripple and compensating for board-level IR drops. Use Value: Remote SENSE pin ensures 2.5V accuracy at FPGA pins despite 50mΩ PCB trace resistance. |
| High-Current Industrial Controller | Portable Pentium® Power Supply |
Use Scenario: Providing 2.5V/7A to ASIC-based motor control modules in factory automation systems with wide ambient temperature swings. IC Role / Device Role / Timing Role: Robust, thermally managed LDO maintaining regulation under sustained 7A load and –40°C to 85°C ambient. Use Value: Dual thermal limits (125°C control / 150°C power section) enable reliable operation without derating below 7A. | Use Scenario: Converting 3.3V battery rail to 2.5V for portable Pentium®-based embedded computing modules. IC Role / Device Role / Timing Role: Efficient low-dropout regulator minimizing voltage headroom loss between battery and processor. Use Value: 540mV dropout at 7A preserves battery runtime better than conventional LDOs requiring >1V headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout, high-current regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3085EDE-2.5#TRPBF | Monolithic 7A LDO with integrated PMOS pass device; 300mV dropout at 7A; no dual-supply requirement | Single-input operation simplifies board design but lacks remote SENSE pin | Select for space-constrained designs needing lower dropout without dual-rail sourcing |
| TPS7A8300RGRT | 6A LDO with 1.1V max dropout at 6A; integrated soft-start; 2% initial accuracy | Higher output tolerance and lower max current; no ADJ pin for transient tuning | Select for TI-ecosystem designs prioritizing ease of use over millivolt-level regulation precision |
Compared with LTC3085EDE-2.5#TRPBF and TPS7A8300RGRT, the LT1580IT7-2.5#06PBF uniquely combines 7A capability, remote Kelvin sensing, ADJ-pin transient tuning, and guaranteed 1% accuracy over temperature-making it optimal for high-precision microprocessor core supplies where load-point regulation is non-negotiable.
Availability
LT1580IT7-2.5#06PBF is available at Aetrix Electronics and suitable for microprocessor core supplies, post-regulation of switching converters, and high-current industrial controllers requiring stable component supply with full temperature-range performance and long-term lifecycle continuity.
Supply support for LT1580IT7-2.5#06PBF 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 LT1580 product line was designed specifically for next-generation microprocessor core power delivery, emphasizing ultra-low dropout, remote sensing, and robust transient response in multi-rail desktop and industrial systems.
FAQ
What is the minimum required voltage difference between VCONTROL and VOUT for LT1580IT7-2.5#06PBF to regulate properly?
The LT1580IT7-2.5#06PBF requires VCONTROL to be at least 1.00V above VOUT at light loads (100mA), rising to 1.30V at 7A and 125°C. Below this threshold, regulation degrades or ceases. This specification is guaranteed across –40°C to 125°C junction temperature and defines the minimum control headroom needed for full 7A operation.
Can LT1580IT7-2.5#06PBF operate with only one input supply?
Yes - LT1580IT7-2.2#06PBF can be used as a single-supply device by connecting VCONTROL and VPOWER together. In that configuration, dropout is determined solely by the minimum VCONTROL–VOUT requirement (≥1.0V), resulting in higher effective dropout than dual-supply mode. The device remains fully functional but loses its sub-0.6V dropout advantage.
Why does LT1580IT7-2.5#06PBF include an ADJ pin on a fixed 2.5V version?
The ADJ pin on LT1580IT7-2.5#06PBF is provided to allow external capacitor bypassing (0.1–1µF to GND), which improves high-frequency transient response and ripple rejection. This feature is unique to the LT1580 family and not found on standard fixed-output LDOs - it leverages the internal reference node to enhance dynamic performance without altering the 2.5V setpoint.
How does remote sensing work on LT1580IT7-2.5#06PBF, and what is its practical benefit?
LT1580IT7-2.5#06PBF uses dedicated SENSE and GND pins to close the feedback loop directly at the load terminals. This eliminates voltage errors caused by PCB trace resistance between the regulator and load. For example, with 50mΩ trace resistance and 7A load, remote sensing prevents a 350mV output error - enabling true 2.5V ±1mV regulation at the CPU pins.
What thermal considerations apply to LT1580IT7-2.5#06PBF in continuous 7A operation?
At 7A with 0.7V dropout (VPOWER–VOUT), LT1580IT7-2.5#06PBF dissipates ~4.9W in the power transistor. With θJA ≈ 50°C/W (TO-220 T7), ambient must stay ≤70°C to keep junction ≤125°C (control section limit). A heatsink reducing θCA to ≤10°C/W is recommended for sustained 7A use in enclosed environments.
LT1580IT7-2.5#06PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-7
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Converter, Intel Pentium®
- Voltage - Input:
- 1.79V ~ 6V
- Number of Outputs:
- 1
- Voltage - Output:
- 2.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-7 Flow 6
LT1580IT7-2.5#06PBF FAQ
1.How can I place an order for LT1580IT7-2.5#06PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1580IT7-2.5#06PBF 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 LT1580IT7-2.5#06PBF reliable?
The price and inventory of LT1580IT7-2.5#06PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1580IT7-2.5#06PBF is usually 5 days.
3.What payment methods are accepted for LT1580IT7-2.5#06PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1580IT7-2.5#06PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1580IT7-2.5#06PBF?
LT1580IT7-2.5#06PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1580IT7-2.5#06PBF 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 LT1580IT7-2.5#06PBF?
For technical support, including LT1580IT7-2.5#06PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1580IT7-2.5#06PBF requirements.
6.How does Aetrix verify that LT1580IT7-2.5#06PBF is sourced from the original manufacturer or authorized distributors?
All LT1580IT7-2.5#06PBF 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 LT1580IT7-2.5#06PBF meets industry standards.
7.What is the process for return or replacement of LT1580IT7-2.5#06PBF?
All LT1580IT7-2.5#06PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1580IT7-2.5#06PBF, 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 LT1580IT7-2.5#06PBF part is unused and in its original packaging.
Return procedure for LT1580IT7-2.5#06PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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