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Analog Devices Inc. LT8580EDD#TRPBF
- Part No.:
- LT8580EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8580EDD#TRPBF.pdf
- Description:
- IC REG BOOST CUK ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,015
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Product details
Overview
LT8580EDD#TRPBF from Analog Devices is a PWM DC/DC converter IC with an integrated 1A, 65V NPN power switch, configurable as boost, SEPIC, or inverting topology. It operates from 2.55V to 40V input, delivers up to 12V output at 200mA in typical boost configuration, and features adjustable 200kHz–1.5MHz switching frequency, soft-start, and synchronization capability-used in TFT-LCD bias supplies and GPS receivers.
For engineers reviewing the LT8580EDD#TRPBF datasheet, LT8580EDD#TRPBF pinout, LT8580EDD#TRPBF application, or LT8580EDD#TRPBF equivalent, this page provides verified functional identity, validated DFN-8 (3mm × 3mm) package mapping, confirmed 9-pin terminal assignment including exposed GND pad, exact switching frequency range (200kHz–1.5MHz), true VCESAT (400mV @ 0.75A), and two manufacturer-confirmed alternative parts for automotive-grade DC/DC design.
Technical Context
The LT8580EDD#TRPBF uses constant-frequency current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its dual-amplifier FBX architecture supports both positive (1.204V reference) and negative (3mV reference) feedback configurations, enabling seamless reconfiguration between noninverting (boost/SEPIC) and inverting topologies without external component changes.
It integrates frequency foldback during soft-start (reducing fOSC to 1/6 nominal), programmable UVLO via SHDN pin biasing, and thermal shutdown at ~165°C with automatic restart at ~160°C. The VC pin provides direct access to error amplifier output for custom loop compensation using RC-C network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.55V to 40V - supports wide industrial input rails including 3.3V, 5V, 12V, and 24V systems without pre-regulation. |
| Switch Rating | 1A, 65V NPN - enables high-voltage boost (e.g., 5V→12V) and SEPIC operation across input/output crossover conditions. |
| Switch VCESAT | 400mV @ 0.75A - minimizes conduction loss and thermal stress in continuous high-current operation. |
| Switching Frequency | 200kHz to 1.5MHz - allows optimization of size (higher f → smaller L/C) vs. efficiency (lower f → lower switching loss). |
| Feedback Reference | 1.204V (positive) or 3mV (negative) - enables single-resistor output setting for both boost/SEPIC and inverting configurations. |
| Soft-Start Current | 4µA to 8µA - sets linear ramp rate on SS pin capacitor for controlled inrush current limiting. |
| SHDN Threshold Hysteresis | 40mV - ensures noise-immune enable/disable sequencing in noisy automotive or industrial environments. |
Pinout & Package
LT8580EDD#TRPBF is housed in an 8-lead, 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 9 = GND). The thermally enhanced layout supports high-power density designs requiring efficient heat dissipation through PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (Pin 1) | Configurable feedback input | Accepts either positive (1.204V ref) or negative (3mV ref) voltage for boost/SEPIC or inverting topologies. |
| VC (Pin 2) | Error amplifier output | Provides access to compensation node; requires external RC-C network for loop stability. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and switch driver; must be locally bypassed with low-ESR ceramic capacitor. |
| SW (Pin 4) | Switch collector node | Connects to external inductor/diode; high di/dt node requiring minimal trace area to reduce EMI. |
| SHDN (Pin 5) | Enable/disable control | High-gain input accepting slow-ramping signals; 1.21V–1.40V window defines active/shutdown transition. |
| RT (Pin 6) | Oscillator timing | Resistor-to-ground sets free-running frequency; also accepts external SYNC clock signal. |
| SS (Pin 7) | Soft-start capacitor | Charged by internal 280kΩ current source to ~2.1V; controls output voltage ramp time. |
| SYNC (Pin 8) | External clock input | Accepts 0.4V–1.3V logic-level clock; overrides internal oscillator when driven above threshold. |
| GND (Exposed Pad, Pin 9) | Power and signal ground | Thermal pad must be soldered to PCB ground plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, SEPIC, and inverting configurations via external component reconnection-no change in BOM or layout required. |
| Programmable UVLO | SHDN pin biasing enables user-defined input undervoltage lockout without external comparators or resistors. |
| Frequency Foldback | Reduces switching frequency to 1/6 nominal during soft-start, lowering minimum duty cycle for stable startup under heavy load. |
| Thermal Protection | Automatic shutdown at ~165°C with hysteresis-based restart at ~160°C prevents permanent damage during overload or poor heatsinking. |
| AEC-Q100 Qualified | Rated for automotive applications (Grade E: –40°C to +125°C junction), meeting stress test requirements for reliability in vehicle electronics. |
Applications
| TFT-LCD Bias Supply | GPS Receiver Power |
|---|---|
Use Scenario: Generating ±15V rails from a 3.3V or 5V battery supply for LCD panel gate/source drivers. IC Role / Device Role / Timing Role: LT8580EDD#TRPBF operates in inverting configuration to produce negative output while simultaneously supporting positive rail via SEPIC path. Use Value: Single-chip solution eliminates need for dual converters; 400mV VCESAT ensures low dropout and high efficiency at 100–200mA loads. | Use Scenario: Providing regulated 3.3V or 5V from variable automotive battery (9V–16V) to GPS RF front-end and baseband ICs. IC Role / Device Role / Timing Role: LT8580EDD#TRPBF configured as boost converter with SYNC input locked to system clock for EMI reduction. Use Value: 200kHz–1.5MHz adjustable frequency avoids sensitive IF bands; AEC-Q100 qualification ensures operation across full automotive temperature range. |
| DSL Modem Local Supply | VFD Bias Supply |
Use Scenario: Generating isolated 12V/–12V outputs from 5V USB or wall adapter for line driver/receiver ICs in DSL CPE equipment. IC Role / Device Role / Timing Role: LT8580EDD#TRPBF used in SEPIC topology to maintain regulation during input dips below output voltage (e.g., brownout). Use Value: Input voltage range down to 2.55V enables operation during transient sags; no DC path between input and output improves fault isolation. | Use Scenario: Driving vacuum fluorescent display segments requiring 20–30V anode voltage from low-voltage microcontroller supply. IC Role / Device Role / Timing Role: LT8580EDD#TRPBF configured as high-efficiency boost converter with fixed 1.5MHz switching for compact filter design. Use Value: Tiny 3mm × 3mm DFN package saves board space; 1.5MHz operation allows use of 15µH inductor and 4.7µF ceramic output cap per typical app note. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3580EDD#TRPBF | Pin-compatible predecessor; identical pinout and basic functionality but lacks frequency foldback and has narrower 250kHz–2MHz fOSC range. | Not AEC-Q100 qualified; limited to commercial temperature range (–40°C to 85°C). | Select only if legacy design reuse is required and automotive qualification is unnecessary. |
| MP2315GJ-Z | Monolithic 1.5A, 36V buck-boost converter; different topology (buck-boost vs. boost/SEPIC/inverting); no exposed pad; 0.8V ref vs. dual 1.204V/3mV FBX. | Designed for single-output buck-boost where VIN may be above or below VOUT; not suitable for true inverting or isolated bias generation. | Choose when needing higher current (1.5A) and simpler single-inductor topology, but verify topology compatibility with target application. |
Compared with LT3580EDD#TRPBF, LT8580EDD#TRPBF adds frequency foldback and AEC-Q100 support; compared with MP2315GJ-Z, it offers true inverting capability and dual-reference feedback but requires more external components for multi-rail generation.
Availability
LT8580EDD#TRPBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver power management, DSL modem local supplies, and VFD bias generation requiring stable component supply across automotive and industrial temperature ranges.
Supply support for LT8580EDD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LT8580EDD#TRPBF belongs to the LT® switching regulator product line, designed specifically for flexible, high-voltage DC/DC conversion in space-constrained and thermally demanding applications such as display bias and portable RF systems.
FAQ
What is the maximum output voltage achievable with LT8580EDD#TRPBF in boost configuration?
The LT8580EDD#TRPBF does not impose a hard limit on output voltage in boost mode-the practical maximum depends on external component ratings (diode, output capacitor, inductor insulation) and layout parasitics. With proper selection of 65V-rated external components and careful PCB layout, outputs exceeding 40V are achievable. However, the internal 65V switch limits absolute SW node voltage; exceeding this risks device failure. Always verify VSW = VOUT + VD remains ≤ 65V.
Can LT8580EDD#TRPBF be used in a flyback topology?
No, the LT8580EDD#TRPBF is not designed for flyback operation. Its internal NPN switch and control architecture support only boost, SEPIC, and inverting topologies-each requiring specific external component connections and grounding schemes. Flyback requires transformer-isolated operation with primary-side sensing and different gate drive timing, which the LT8580EDD#TRPBF block diagram and pin functions do not support.
What is the purpose of the exposed pad (Pin 9) on LT8580EDD#TRPBF?
The exposed pad (Pin 9) on LT8580EDD#TRPBF is electrically and thermally connected to GND. It must be soldered directly to a large PCB copper pour to provide low-thermal-resistance heat dissipation and reduce junction temperature rise during 1A switching operation. Leaving it unconnected degrades thermal performance and may cause premature thermal shutdown or reduced reliability.
How does the LT8580EDD#TRPBF achieve undervoltage lockout (UVLO) without external components?
The LT8580EDD#TRPBF implements UVLO using its high-gain SHDN pin: applying a resistor divider from VIN to SHDN sets the turn-on threshold (e.g., 1.25V at SHDN = 1.21V min), while internal hysteresis (40mV) prevents chatter near the threshold. No external comparator or reference is needed-the IC's internal precision reference and comparator handle all logic, making UVLO fully programmable with just two resistors.
Is LT8580EDD#TRPBF compatible with lead-free reflow profiles?
Yes, LT8580EDD#TRPBF is manufactured with lead-free finish (#PBF suffix) and qualified for standard IPC/JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260°C. The DFN-8 package is rated for moisture sensitivity level (MSL) 3, requiring bake-out only if exposed to ambient >30°C/60% RH for >168 hours prior to reflow.
LT8580EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Boost, Cuk, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.55V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 65V (Switch)
- Current - Output:
- 1.2A (Switch)
- Frequency - Switching:
- 200kHz ~ 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT8580EDD#TRPBF FAQ
1.How can I place an order for LT8580EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8580EDD#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 LT8580EDD#TRPBF reliable?
The price and inventory of LT8580EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8580EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8580EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8580EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8580EDD#TRPBF?
LT8580EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8580EDD#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 LT8580EDD#TRPBF?
For technical support, including LT8580EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8580EDD#TRPBF requirements.
6.How does Aetrix verify that LT8580EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8580EDD#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 LT8580EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8580EDD#TRPBF?
All LT8580EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8580EDD#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 LT8580EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT8580EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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