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Analog Devices Inc. LT1580CT#PBF
- Part No.:
- LT1580CT#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- TO-220-5
- Datasheet:
-
LT1580CT#PBF.pdf
- Description:
- IC REG CONV PENTIUM 1OUT TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,539
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Product details
Overview
LT1580CT#PBF 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), 540mV dropout at full load, and fast transient response - designed for microprocessor core supplies on motherboards using available 3.3V/5V rails.
For engineers reviewing the LT1580CT#PBF datasheet, LT1580CT#PBF pinout, LT1580CT#PBF application, or LT1580CT#PBF equivalent, this device is selected for high-current, tight-tolerance DC-DC post-regulation where dual-input voltage control enables sub-0.6V dropout at 7A while maintaining ±0.6% initial output accuracy and Kelvin-sensed load regulation.
Technical Context
The LT1580CT#PBF employs a two-rail architecture: VPOWER supplies the NPN pass transistor collector (3.3V–5.5V input), while VCONTROL powers the control circuitry (4V–12V, ≥1V above VOUT). This separates drive current (≈1% of IOUT) from load current, enabling saturation of the output transistor and reducing dropout by one VBE.
It integrates remote SENSE for true Kelvin sensing at the load, an exposed-tab TO-220-7 package with isolated GND pin, and ADJ pin accessibility on the fixed-output variant to support 0.1µF–1µF bypassing for enhanced transient suppression and ripple rejection (60–80dB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.500 V ±0.6% at 25°C; maintains ±1% over –40°C to 125°C and 0–7A load |
| Max Output Current | 7 A continuous; current limit set at 7.1–8 A with 100 mV output droop |
| Dropout Voltage | 540 mV at 7A (VPOWER–VOUT); minimum VPOWER = VOUT + 0.70 V at full load, 0°C–125°C |
| Load Regulation | <1 mV typical (100 mA → 7 A step at SENSE pin); enabled by remote sensing |
| Ripple Rejection | 60–80 dB at 1 VP-P, 100 Hz–10 kHz; improved via ADJ pin bypass capacitor |
| Thermal Resistance | Junction-to-case: 0.65°C/W (control section), 2.70°C/W (power transistor) |
| Control Pin Current | 60–120 mA at 7A load and 0°C–125°C; scales ~1:100 with output current |
Pinout & Package
LT1580CT#PBF uses a 7-lead plastic TO-220 package (T7) with exposed metal tab electrically connected to VPOWER and thermally coupled to heatsink. The GND pin is isolated for precise feedback reference.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SENSE) | Positive feedback sense node | Kelvin connection to load anode; enables <1 mV load regulation by closing loop at point of use |
| 2 (GND) | Reference ground for internal divider | Isolated return for feedback network; prevents ground noise from degrading output accuracy |
| 3 (ADJ) | Adjust terminal (brought out on fixed version) | Allows external 0.1–1 µF capacitor to improve transient response and ripple rejection |
| 4 (VOUT) | Main power output | Delivers up to 7A; connects to bulk capacitance and load; not used for regulation sensing |
| 5 (VCONTROL) | Control circuit supply | Must be ≥1.0 V above VOUT (min 1.15 V at 7A); supplies ~70 mA drive current at full load |
| 6 (VPOWER) | Pass transistor collector supply | Supplies full 7A load current; must be ≥0.7 V above VOUT at full load; tab-connected |
| 7 (NC) | No connect | Unbonded pad; no electrical function; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply LDO architecture | Enables 540 mV dropout at 7A by separating control drive (VCONTROL) from power path (VPOWER) |
| Remote SENSE capability | Eliminates trace/connector IR drop impact on regulation; achieves <1 mV load regulation at load terminals |
| ADJ pin accessibility (fixed version) | Permits external capacitor bypass to reduce high-frequency output impedance and improve step-load recovery |
| Guaranteed 1% total output accuracy | Maintained across –40°C to 125°C, 0–7A, and line/load transients without external trimming |
| Integrated thermal & current protection | Auto-shutdown under overload or junction overheating; safe recovery without latch-up |
Applications
| Microprocessor Core Supply | Post-Regulator for Switching Supplies |
|---|---|
|
Use Scenario: Generating stable 2.5V/7A for Pentium® processors operating at 90–166 MHz on ATX motherboards with existing 3.3V and 5V rails. IC Role / Device Role / Timing Role: Primary linear post-regulator delivering tightly regulated core voltage with Kelvin-sensed feedback at CPU socket. Use Value: Enables sub-0.6V dropout operation at full load while meeting ±1% output tolerance and <1 mV transient droop requirements. |
Use Scenario: Tightening output voltage of a 3.3V buck converter feeding a 2.5V logic domain in industrial PLCs. IC Role / Device Role / Timing Role: Low-noise, high-PSRR linear regulator placed downstream of switching stage to suppress ripple and EMI. Use Value: Provides 60–80 dB ripple rejection and fast transient recovery to meet FPGA I/O voltage stability specs. |
| High-Current Embedded Power Rail | Portable Pentium® Processor Supply |
|
Use Scenario: Delivering 2.5V/7A to multi-core DSPs in telecom baseband cards with constrained board space and thermal budget. IC Role / Device Role / Timing Role: High-current LDO with exposed-tab thermal path and remote sense for precision rail generation. Use Value: Achieves 7A delivery with ≤0.8V max dropout and 2.7°C/W junction-to-case resistance for direct heatsink mounting. |
Use Scenario: Powering mobile Pentium® variants requiring 2.9V from 3.3V supply in portable computing systems. IC Role / Device Role / Timing Role: Fixed-output LDO configured as 3.3V→2.9V step-down with minimal external components. Use Value: Eliminates sequencing issues between VPOWER and VCONTROL; ensures regulated start-up only when both supplies are valid. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3085EDE#PBF | 4A max output; integrated MOSFET; 250mV dropout at 4A; no remote sense; requires external compensation | Lower current, single-supply only; suited for space-constrained designs without Kelvin sensing needs | Select when 4A suffices and board layout cannot accommodate 7-lead TO-220 footprint or remote sense traces |
| TPS7A8300RGRT | 3A max; 110mV dropout at 3A; integrated PMOS pass element; no VCONTROL/VPOWER separation | Single-input architecture; lower quiescent current; no dual-rail flexibility or 7A capability | Choose for low-IQ battery-backed systems where 3A and 110mV dropout are sufficient and dual-rail complexity is undesirable |
Compared with LTC3085EDE#PBF and TPS7A8300RGRT, the LT1580CT#PBF uniquely delivers 7A with remote sense and dual-supply architecture - making it irreplaceable for motherboard-level 2.5V microprocessor rails demanding sub-0.6V dropout and <1mV load regulation at full current.
Availability
LT1580CT#PBF is available at Aetrix Electronics and suitable for microprocessor core supplies, high-current post-regulators, embedded power rails, and portable processor applications requiring stable component supply with guaranteed long-term availability.
Supply support for LT1580CT#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 LT1580 product line was developed specifically for high-current, low-dropout microprocessor core regulation in desktop and embedded systems - addressing the need for dual-rail efficiency, Kelvin-sensed accuracy, and robust transient response in 2V–3V supply domains.
FAQ
What is the maximum dropout voltage of the LT1580CT#PBF at 7A load?
The LT1580CT#PBF has a maximum dropout voltage of 540 mV at 7A load under typical conditions (TJ = 25°C), rising to 800 mV at full temperature range (0°C–125°C) due to increased VPOWER–VOUT requirement. This value reflects the minimum VPOWER needed to maintain regulation - not the VCONTROL–VOUT margin, which is separately specified at 1.30 V max.
Can the LT1580CT#PBF operate from a single input supply?
Yes, the LT1580CT#PBF can operate as a single-supply device by connecting VCONTROL and VPOWER together. In this configuration, dropout is determined by the VCONTROL specification (≥1.0 V above VOUT), resulting in higher effective dropout than dual-supply mode. The device retains all protection features and remote sense functionality.
Why does the LT1580CT#PBF have a separate GND pin and NC pin?
The LT1580CT#PBF includes a dedicated GND pin (Pin 2) to serve as the reference return for the internal resistor divider, ensuring accurate feedback independent of power ground noise. The NC pin (Pin 7) is an unconnected bond pad - a structural artifact of the 7-lead TO-220-7 mold compound layout - and must remain floating to avoid violating absolute maximum ratings.
How does the ADJ pin function on the fixed-output LT1580CT#PBF?
Although the LT1580CT#PBF is a fixed 2.5V device, its ADJ pin (Pin 3) is brought out to allow external capacitor bypassing (0.1–1 µF to GND). This capacitor improves high-frequency PSRR and reduces output impedance during large load transients - a feature absent in traditional 3-terminal fixed LDOs and critical for microprocessor supply stability.
What thermal derating applies to the LT1580CT#PBF at elevated ambient temperatures?
The LT1580CT#PBF has two thermal limits: control section (125°C max TJ, θJA = 30°C/W) and power transistor (150°C max TJ, θJA = 50°C/W). At >12W dissipation, the power transistor dominates thermal design; below 12W, the control section sets the ambient limit. Derating curves in the datasheet show usable ambient range drops from 70°C (at 0W) to ~45°C (at 10W) with standard heatsinking.
LT1580CT#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Converter, Intel Pentium®
- Voltage - Input:
- 1.79V ~ 6V
- Number of Outputs:
- 1
- Voltage - Output:
- 1.25V ~ 4.65V
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LT1580CT#PBF FAQ
1.How can I place an order for LT1580CT#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1580CT#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 LT1580CT#PBF reliable?
The price and inventory of LT1580CT#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1580CT#PBF is usually 5 days.
3.What payment methods are accepted for LT1580CT#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1580CT#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1580CT#PBF?
LT1580CT#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1580CT#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 LT1580CT#PBF?
For technical support, including LT1580CT#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1580CT#PBF requirements.
6.How does Aetrix verify that LT1580CT#PBF is sourced from the original manufacturer or authorized distributors?
All LT1580CT#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 LT1580CT#PBF meets industry standards.
7.What is the process for return or replacement of LT1580CT#PBF?
All LT1580CT#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1580CT#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 LT1580CT#PBF part is unused and in its original packaging.
Return procedure for LT1580CT#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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