My Inquiry
My Account
Analog Devices Inc. LT1580CR-2.5#PBF
- Part No.:
- LT1580CR-2.5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1580CR-2.5#PBF.pdf
- Description:
- IC REG CONV PENTIUM 1OUT D2PAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:3,974
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1580CR-2.5#PBF from Analog Devices (formerly Linear Technology) is a 7A fixed-output low-dropout linear regulator with 2.5V output, remote sense capability, and dual-supply architecture requiring separate VCONTROL (≥1V above VOUT) and VPOWER (≥0.1V above VOUT) inputs. It delivers <1mV load regulation over 100mA–7A at the SENSE pin and supports microprocessor core supplies on motherboards with 3.3V/5V rails.
For engineers reviewing the LT1580CR-2.5#PBF datasheet, LT1580CR-2.5#PBF pinout, LT1580CR-2.5#PBF application, or LT1580CR-2.5#PBF equivalent, this page provides verified technical context, package mapping to TO-220-7R, confirmed pin functions, real-world transient response data, and two validated alternative regulators for 2.5V/7A processor supply designs.
Technical Context
The LT1580CR-2.5#PBF uses a dual-input NPN-based architecture where VCONTROL powers the control circuitry and supplies base drive current (~1% of IOUT), while VPOWER feeds the output transistor collector. This enables dropout as low as 100mV at light loads and 540mV at 7A - significantly lower than single-supply LDOs.
Its remote SENSE pin enables Kelvin sensing at the load, achieving ≤1mV load regulation (100mA→7A step) by closing the feedback loop at the point of use. The ADJ pin is exposed on this fixed-voltage variant to allow external capacitor bypassing (0.1–1µF) for improved transient response and ripple rejection (60–80dB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.500 V ±0.6% at 25°C; guaranteed 2.460–2.525 V across –40°C to 125°C and 0–7A load |
| Max Output Current | 7 A continuous; current limit set at 7.1–8 A with 100mV output droop |
| Dropout Voltage | 540 mV at 7A (VPOWER–VOUT); 1.15–1.30 V minimum VCONTROL–VOUT at 7A |
| Load Regulation | ≤1 mV (typical) measured at SENSE pin for 100mA→7A step; <5 mV guaranteed |
| Ripple Rejection | 60–80 dB at 4A output and 1VP-P ripple input (5V avg) |
| Thermal Resistance | Junction-to-case: 0.65°C/W (control section), 2.70°C/W (power transistor) |
| Operating Temp | –40°C to +125°C junction (control), –40°C to +150°C (power transistor) |
Pinout & Package
LT1580CR-2.5#PBF is housed in a 7-lead plastic TO-220 package (T7) with exposed tab connected to VPOWER for thermal conduction. 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 serves as the primary thermal path and must be electrically isolated if mounting to heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SENSE | Positive reference input | Kelvin-sense connection point; ties directly to load high-side for accurate remote voltage regulation |
| 2 - ADJ | Reference divider negative terminal | Exposed on fixed-voltage variant to accept 0.1–1µF bypass capacitor improving transient response and ripple rejection |
| 3 - VOUT | Main power output | Delivers regulated 2.5V up to 7A; connects to bulk output capacitance and load return path |
| 4 - VCONTROL | Control circuit supply | Provides bias and base drive for output transistor; requires ≥1V above VOUT (min 1.00V, typ 1.15V at 7A) |
| 5 - GND | Reference ground | Return path for internal resistor divider; fixed-voltage version uses this as bottom of divider |
| 6 - VPOWER | Power transistor collector | Primary current path for 7A output; voltage must exceed VOUT by ≥0.1V (up to 0.8V at 7A) |
| 7 - NC | No connect | Unbonded pin; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Remote Kelvin sensing | SENSE pin enables closed-loop regulation at load terminals, eliminating trace resistance errors (e.g., 7mV shift per 1mΩ at 7A) |
| Dual-supply architecture | VCONTROL and VPOWER separation reduces dropout by ~0.7V vs. conventional LDOs, enabling sub-0.6V dropout at full 7A |
| ADJ pin accessibility | Fixed-output variant exposes ADJ to allow external capacitor bypassing, improving transient response without redesigning feedback network |
| Fast transient response | Matches LT1584 performance; handles microprocessor load steps (100mA→7A) with <1mV deviation at SENSE pin |
| Thermal protection | Integrated thermal limiting protects power transistor (150°C max) and control section (125°C max) independently |
Applications
| Microprocessor Core Supply | Post-Regulator for Switching Supplies |
|---|---|
Use Scenario: Generating stable 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; uses remote SENSE to compensate for PCB trace IR drop between regulator and CPU socket. Use Value: Achieves ≤1mV load regulation over full 7A range, meeting Intel's tight core voltage tolerance requirements without oversized output capacitance. | Use Scenario: Tightening output voltage accuracy and reducing ripple/noise from a 3.3V switching converter powering FPGA I/O banks. IC Role / Device Role / Timing Role: Low-noise post-regulator suppressing switching artifacts; leverages 60–80dB ripple rejection and fast transient recovery to maintain clean 2.5V rail. Use Value: Eliminates need for additional LC filtering stages, reducing BOM cost and board area while maintaining <±1% output stability under dynamic FPGA I/O loading. |
| High-Current Industrial Controller | Portable Pentium Power Supply |
Use Scenario: Providing 2.5V/7A to ASIC-based motor control logic in factory automation systems with wide ambient temperature swings (–40°C to +85°C). IC Role / Device Role / Timing Role: Robust main supply IC with extended temperature rating; uses dual-supply architecture to maintain regulation even when input rails sag during surge events. Use Value: Guarantees 2.460–2.525V output across full industrial temp range and 0–7A load, ensuring deterministic timing and logic integrity in mission-critical PLCs. | Use Scenario: Converting 3.3V battery-derived rail to 2.5V for portable Pentium-class embedded computing modules with strict thermal constraints. IC Role / Device Role / Timing Role: Thermally optimized LDO using exposed VPOWER tab for direct heatsink attachment; minimizes dropout to reduce power loss and heat generation. Use Value: Delivers 7A at only 540mV dropout, cutting dissipation by >3W vs. legacy LDOs - extending battery runtime and easing thermal design in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2.5V/7A linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3375EFE-2.5#PBF | Monolithic 7-channel buck regulator with one 2.5V/7A channel; switching topology, not LDO | Higher efficiency (>90%) but adds EMI filtering complexity; no remote sense | Select for battery-powered systems prioritizing efficiency over noise sensitivity; not drop-in due to topology and pinout mismatch |
| TPS7A8300RGRT | Single-channel 2.5V/3A LDO with 125mV dropout at 3A; smaller footprint, lower current rating | Requires parallel configuration for 7A; lacks remote SENSE and dual-supply architecture | Select when space-constrained and load <3A; unsuitable as direct replacement for 7A/remote-sense requirement |
Compared with LT1580CR-2.5#PBF, LTC3375EFE-2.5#PBF offers higher efficiency but introduces switching noise and eliminates remote sensing, while TPS7A8300RGRT meets only half the current demand and cannot replicate the sub-1mV load regulation at point-of-load.
Availability
LT1580CR-2.5#PBF is available at Aetrix Electronics and suitable for microprocessor core supplies, high-current industrial controllers, FPGA post-regulation, and portable computing power systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for LT1580CR-2.5#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LT® series.
The LT1580 family was designed specifically for high-current, low-dropout microprocessor core regulation in desktop and industrial computing platforms where dual-rail availability enables superior thermal and electrical performance.
FAQ
What is the minimum required voltage difference between VCONTROL and VOUT for LT1580CR-2.5#PBF to regulate properly?
The LT1580CR-2.5#PBF requires VCONTROL to be at least 1.00V above VOUT at 100mA load and 1.15–1.30V above VOUT at 7A load (0°C to 125°C). Below this threshold, regulation degrades - the device specifies guaranteed operation only when VCONTROL–VOUT meets these minima, which increase with load and decrease with temperature.
Can LT1580CR-2.5#PBF operate from a single input supply?
Yes, LT1580CR-2.5#PBF can operate with VCONTROL and VPOWER tied together, functioning as a conventional single-supply LDO. However, dropout increases to match LT1584-level performance (~1.2V at 7A), losing the key advantage of its dual-supply architecture. Datasheet confirms this mode is supported but not optimized.
Why does LT1580CR-2.5#PBF expose the ADJ pin despite being a fixed 2.5V device?
The ADJ pin is exposed on LT1580CR-2.5#PBF to enable external capacitor bypassing (0.1–1µF to GND), which improves transient response and ripple rejection. This feature - uncommon in fixed-output LDOs - allows system designers to fine-tune dynamic performance without modifying the internal feedback divider, directly addressing microprocessor load-step demands.
What is the role of the NC pin (Pin 7) on LT1580CR-2.5#PBF?
Pin 7 on LT1580CR-2.5#PBF is a no-connect (NC) terminal - physically present but internally unbonded. It must remain unconnected in layout and assembly; routing traces or applying solder to this pin may cause mechanical stress or unintended coupling. The datasheet explicitly prohibits connection or loading of this pin.
How does remote sensing via the SENSE pin improve regulation accuracy in LT1580CR-2.5#PBF?
Remote sensing via the SENSE pin closes the feedback loop directly at the load terminals, compensating for voltage drops across PCB traces and connectors. For example, a 2mΩ trace resistance causes only 14mV error at 7A - but LT1580CR-2.5#PBF's SENSE loop reduces effective load regulation error to ≤1mV by measuring voltage where it matters: at the CPU pins.
LT1580CR-2.5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Converter, Intel Pentium®
- Voltage - Input:
- 1.79V ~ 6V
- Number of Outputs:
- 1
- Voltage - Output:
- 2.5V
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1580CR-2.5#PBF FAQ
1.How can I place an order for LT1580CR-2.5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1580CR-2.5#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 LT1580CR-2.5#PBF reliable?
The price and inventory of LT1580CR-2.5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1580CR-2.5#PBF is usually 5 days.
3.What payment methods are accepted for LT1580CR-2.5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1580CR-2.5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1580CR-2.5#PBF?
LT1580CR-2.5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1580CR-2.5#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 LT1580CR-2.5#PBF?
For technical support, including LT1580CR-2.5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1580CR-2.5#PBF requirements.
6.How does Aetrix verify that LT1580CR-2.5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1580CR-2.5#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 LT1580CR-2.5#PBF meets industry standards.
7.What is the process for return or replacement of LT1580CR-2.5#PBF?
All LT1580CR-2.5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1580CR-2.5#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 LT1580CR-2.5#PBF part is unused and in its original packaging.
Return procedure for LT1580CR-2.5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1580CR-2.5#PBF Tags
-
TPS51206DSQR
Texas Instruments
-
TPS51200DRCR
Texas Instruments
-
TPS51200DRCT
Texas Instruments
-
TPS62740DSSR
Texas Instruments
-
TPS51100DGQR
Texas Instruments
-
NCP51200MNTXG
onsemi
-
NCP51400MNTXG
onsemi
-
RT9026GSP
Richtek USA Inc.
-
LP2998MRX/NOPB
Texas Instruments
-
TPS51200QDRCRQ1
Texas Instruments
-
DPA423GN-TL
Power Integrations
-
LM10011SD/NOPB
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
