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Analog Devices Inc. LT1580CQ#TRPBF
- Part No.:
- LT1580CQ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LT1580CQ#TRPBF.pdf
- Description:
- IC REG CONV PENTIUM 1OUT 5DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,298
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Product details
Overview
LT1580CQ#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 using separate 3.3V power and 5V control rails.
For engineers reviewing the LT1580CQ#TRPBF datasheet, LT1580CQ#TRPBF pinout, LT1580CQ#TRPBF application, or LT1580CQ#TRPBF equivalent, key selection criteria include its dual-input voltage requirement (VCONTROL ≥ VOUT + 1.0V, VPOWER ≥ VOUT + 0.1V), Kelvin-sense accuracy, fast transient response for CPU load steps, and Q-package thermal performance (θJA = 50°C/W).
Technical Context
The LT1580CQ#TRPBF uses a two-rail architecture: VCONTROL powers the control circuitry and drives the NPN output transistor, while VPOWER supplies the high-current path. This enables saturation drive and reduces dropout by ~0.7V versus conventional LDOs.
It integrates remote SENSE for load-point regulation, ADJ pin accessibility (even in fixed-2.5V version) to add bypass capacitance for improved transient response and ripple rejection, and internal thermal/current limiting protecting both control and power sections independently.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.500 V ±0.6% at 25°C; maintains ≤±0.75% over –40°C to 125°C and 0–7A load |
| Max Output Current | 7 A continuous; current limit set at 7.1–8.0 A with 100 mV output droop |
| Dropout Voltage | 540 mV at 7 A (VPOWER–VOUT); requires VPOWER ≥ VOUT + 0.7 V under worst-case temp/load |
| Load Regulation | ≤1 mV typical (100 mA → 7 A step at SENSE pin); enabled by Kelvin sensing |
| VCONTROL Requirement | Must exceed VOUT by ≥1.0 V (min), ≤1.3 V (optimal); supplies ~1% of IOUT as drive current |
| Ripple Rejection | 60–80 dB at 120 Hz; enhanced by ADJ pin capacitor bypassing |
| Thermal Resistance | θJA = 50°C/W (Q package); θJC = 2.7°C/W (power section), 0.65°C/W (control section) |
Pinout & Package
LT1580CQ#TRPBF is housed in a 5-lead plastic DD (Dual Drain) package with exposed tab (thermal pad) connected to the output. The package supports surface-mount assembly and requires heatsinking via the tab for sustained 7A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SENSE | Positive Kelvin sense input | Connects directly to load VDD to eliminate PCB trace IR drop from regulation loop |
| 2 - ADJ | Reference node for internal divider | Brought out on fixed-2.5V version to allow 0.1–1 µF bypass capacitor improving transient response |
| 3 - VOUT | Main power output terminal | Delivers regulated 2.5V up to 7A; tab is electrically connected to this pin |
| 4 - VCONTROL | Control circuit supply | Provides bias and drive current (~70 mA at 7A); must be ≥1.0 V above VOUT |
| 5 - VPOWER | Power transistor collector | Carries full load current; dropout determined by (VPOWER – VOUT), min 0.1 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply architecture | Separates control logic (VCONTROL) and power path (VPOWER), enabling <0.8 V dropout at 7A |
| Remote Kelvin sensing | SENSE pin placement at load eliminates regulation error from PCB resistance up to ~10 mΩ |
| ADJ pin accessibility | Enables external capacitor (0.1–1 µF) on fixed-2.5V variant to reduce output voltage overshoot/undershoot during 100 mA→7A transients |
| Fast transient response | Matches LT1584 performance; stabilizes within microseconds after large load steps without external compensation |
| Independent thermal protection | Separate junction temperature limits: 125°C (control section), 150°C (power transistor) |
Applications
| Microprocessor Core Supply | Post-Regulator for Switching Supplies |
|---|---|
Use Scenario: Generating 2.5V/7A for Pentium® processors operating at 90–166 MHz on ATX motherboards with available 3.3V and 5V rails. IC Role / Device Role / Timing Role: Primary linear regulator delivering tightly regulated core voltage with sub-millivolt load regulation at point-of-load. Use Value: Eliminates need for oversized bulk capacitance by achieving <1 mV load regulation and fast recovery from 100 mA ↔ 7 A steps. | 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 dependency. IC Role / Device Role / Timing Role: Low-noise post-regulator rejecting switching ripple and compensating for converter DC drift and load-induced droop. Use Value: Provides 60–80 dB ripple rejection and removes need for complex sequencing controllers-output only enables when both VCONTROL and VPOWER are valid. |
| High-Current Industrial Logic Supply | Portable Pentium® Processor Power |
Use Scenario: Providing 2.5V/7A to ASIC-based test equipment where EMI-sensitive analog circuitry shares ground with digital loads. IC Role / Device Role / Timing Role: High-current, low-ESR-capacitor-compatible LDO with isolated control/power paths minimizing coupling into sensitive analog sections. Use Value: Dual-rail design prevents control-loop noise from modulating the power path, preserving PSRR >60 dB across 10 Hz–100 kHz. | Use Scenario: Converting 3.3V system rail to 2.9V for portable Pentium® CPUs, leveraging existing 3.3V supply as VPOWER and 5V as VCONTROL. IC Role / Device Role / Timing Role: Efficient low-dropout regulator enabling battery-powered operation with minimal headroom loss. Use Value: Achieves 540 mV dropout at 7A-enabling longer runtime vs. single-supply LDOs requiring ≥1.2 V headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3085EDE#TRPBF | Single-supply 7A LDO; no VCONTROL/VPOWER separation; higher 650 mV dropout at 7A; integrated PG flag | Lacks remote sense; less suitable for precision load-point regulation; simpler BOM | Choose when board space is constrained and dual-rail routing is impractical |
| TPS7A8300RGRT | Single-supply 3A LDO; 300 mV dropout at 3A; integrated soft-start; lower quiescent current | Lower current rating; no Kelvin sense; optimized for low-IQ portable apps-not direct 7A replacement | Consider only for scaled-down designs where 3A suffices and sequencing simplicity is critical |
Compared with LTC3085EDE#TRPBF and TPS7A8300RGRT, the LT1580CQ#TRPBF uniquely delivers 7A with sub-1 mV load regulation via remote sensing and achieves lowest dropout in dual-supply configurations-making it irreplaceable for legacy Pentium® and PowerPC™ core supply designs requiring guaranteed 2.5V ±1% at full load.
Availability
LT1580CQ#TRPBF is available at Aetrix Electronics and suitable for microprocessor core supplies, post-regulation of switching converters, high-current industrial logic systems, and portable computing power delivery requiring stable component supply and long-term lifecycle support.
Supply support for LT1580CQ#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 support for legacy Linear power products including the LT1580 family.
The LT1580 product line was designed specifically for high-current, low-dropout microprocessor core regulation in desktop and embedded systems using dual-voltage motherboard architectures.
FAQ
What is the minimum required voltage difference between VCONTROL and VOUT for LT1580CQ#TRPBF to regulate properly?
The LT1580CQ#TRPBF requires VCONTROL to be at least 1.00 V above VOUT across temperature and load (0°C–125°C, 0–7A). At –40°C, the minimum rises to 1.20 V. Operation below this threshold causes reduced current limit and potential regulation loss. This specification is distinct from VPOWER's minimum headroom (0.10–0.80 V), which governs dropout but not control functionality.
Can LT1580CQ#TRPBF operate with only one input supply, and what is the impact on dropout voltage?
Yes, LT1580CQ#TRPBF can operate as a single-supply device by connecting VCONTROL and VPOWER together. In this mode, dropout is determined solely by the VCONTROL–VOUT margin and matches the LT1584-typically ~1.2 V at 7A. Dual-supply operation remains mandatory to achieve the specified 540 mV dropout at full load.
Why does LT1580CQ#TRPBF include an ADJ pin even though it is a fixed 2.5V regulator?
The ADJ pin on LT1580CQ#TRPBF provides access to the internal reference node, enabling connection of a 0.1–1 µF capacitor to ground. This bypass improves transient response and ripple rejection-critical for microprocessor loads with rapid 100 mA ↔ 7 A current steps. Without this pin, fixed-output LDOs cannot optimize dynamic performance beyond factory compensation.
How does remote sensing work on LT1580CQ#TRPBF, and what layout guidance applies?
LT1580CQ#TRPBF uses the SENSE pin to close the feedback loop at the load, not at the regulator output. To implement Kelvin sensing, route separate SENSE+ and SENSE– traces directly from the load's power/ground pads to the SENSE and GND pins (on 7-lead variants) or use SENSE and ADJ (on 5-lead LT1580CQ#TRPBF per datasheet Figure 5). Avoid sharing sense traces with high-current paths to prevent noise injection.
Is LT1580CQ#TRPBF RoHS compliant and lead-free?
Yes, LT1580CQ#TRPBF is RoHS compliant and lead-free. The "#TRPBF" suffix explicitly denotes tape-and-reel packaging with Pb-free (lead-free) termination finish per JEDEC J-STD-609. Analog Devices confirms full compliance with EU RoHS Directive 2011/65/EU and China RoHS II.
LT1580CQ#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:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-5
LT1580CQ#TRPBF FAQ
1.How can I place an order for LT1580CQ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1580CQ#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 LT1580CQ#TRPBF reliable?
The price and inventory of LT1580CQ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1580CQ#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1580CQ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1580CQ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1580CQ#TRPBF?
LT1580CQ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1580CQ#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 LT1580CQ#TRPBF?
For technical support, including LT1580CQ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1580CQ#TRPBF requirements.
6.How does Aetrix verify that LT1580CQ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1580CQ#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 LT1580CQ#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1580CQ#TRPBF?
All LT1580CQ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1580CQ#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 LT1580CQ#TRPBF part is unused and in its original packaging.
Return procedure for LT1580CQ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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