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Analog Devices Inc. LT8580EDD#PBF
- Part No.:
- LT8580EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8580EDD#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
LT8580EDD#PBF 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#PBF datasheet, LT8580EDD#PBF pinout, LT8580EDD#PBF application, or LT8580EDD#PBF equivalent, key selection considerations include its 8-lead 3mm × 3mm DFN package, 1.204V positive feedback reference, 400mV typical VCE(SAT) at 0.75A, user-configurable UVLO, and compatibility with high-frequency ceramic inductor designs for compact power solutions.
Technical Context
The LT8580EDD#PBF employs constant-frequency current-mode control with internal slope compensation, enabling stable operation up to 50% duty cycle without subharmonic oscillation when minimum inductance criteria are met. Its dual-amplifier FBX architecture supports both noninverting (boost/SEPIC) and inverting topologies by selecting either 1.204V or 3mV reference bias via external resistor network.
Startup behavior is controlled by three coordinated functions: precision SHDN threshold (1.21V–1.40V hysteresis), SS pin ramped by internal 280kΩ resistor to ~2.1V, and frequency foldback (1/6× nominal fOSC) when FBX voltage falls between 300mV–920mV - collectively ensuring controlled inrush and robust start-up under varying input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.55V to 40V - supports wide industrial and automotive supply rails including 12V, 24V, and 36V battery systems. |
| Switch Rating | 1A continuous, 65V collector-emitter - enables high-voltage boost and SEPIC designs without external switch. |
| Feedback Reference | 1.204V (positive) / 3mV (negative) - sets output voltage precisely with single resistor; eliminates need for divider network in basic configurations. |
| Switching Frequency | 200kHz to 1.5MHz - adjustable via RT pin resistor or external SYNC clock; allows optimization of size vs. efficiency trade-offs. |
| VCE(SAT) | 400mV at 0.75A - reduces conduction loss and thermal stress in high-current operation. |
| Soft-Start Current | 4µA to 8µA - controls ramp rate of SS capacitor voltage, enabling predictable inrush current limiting. |
| UVLO Threshold | User-configurable via SHDN pin resistor divider - provides system-level brown-out protection independent of internal reference. |
Pinout & Package
LT8580EDD#PBF is housed in an 8-lead, 3mm × 3mm plastic DFN package with exposed ground pad (Pin 9). Thermal resistance θJA = 43°C/W. Exposed pad must be soldered directly to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (Pin 1) | Positive/Negative Feedback Input | Selects 1.204V (noninverting) or 3mV (inverting) reference; determines output voltage via single RFBX resistor. |
| VC (Pin 2) | Error Amplifier Output | Connects external RC compensation network; sets loop stability and transient response. |
| VIN (Pin 3) | Main Power Input | Supplies internal circuitry and switch driver; requires local 2.2µF ceramic bypass capacitor. |
| SW (Pin 4) | Switch Collector Node | High-di/dt node; must minimize trace area to reduce EMI and parasitic inductance. |
| SHDN (Pin 5) | Enable/Disable Control | Accepts slowly ramping signals; 1.21V–1.40V hysteresis enables reliable UVLO implementation. |
| RT (Pin 6) | Oscillator Timing Input | Sets free-running frequency with resistor to GND; also accepts SYNC signal when driven low. |
| SS (Pin 7) | Soft-Start Control | Charged by internal 280kΩ current source; external capacitor sets startup time and inrush profile. |
| SYNC (Pin 8) | External Clock Input | Accepts 0.4V–1.3V logic levels; synchronizes switching to external clock ≥75% of fOSC. |
| GND (Pin 9, Exposed Pad) | Power and Signal Ground | Thermal and electrical ground reference; mandatory solder connection to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable Topology Support | Single IC implements boost, SEPIC, or inverting converters - reduces BOM count and design reuse across multiple power architectures. |
| Integrated Soft-Start | Internal 280kΩ charging current + external capacitor enables precise, repeatable startup timing without external timers. |
| Synchronization Capability | Accepts external clock down to 0.4V low level - allows noise-sensitive systems to align switching edges and avoid beat frequencies. |
| High-Gain SHDN Pin | Supports direct connection to slow-rising microcontroller GPIO or resistor-divider UVLO - eliminates need for external comparators. |
| Frequency Foldback | Reduces fOSC to 1/6× nominal during soft-start or fault recovery - improves minimum duty cycle control and prevents current runaway. |
Applications
| VFD Bias Supplies | TFT-LCD Bias Supplies |
|---|---|
Use Scenario: Generating high-voltage negative rail (e.g., –15V) from 5V or 12V input for vacuum fluorescent display segment drivers. IC Role / Device Role / Timing Role: Inverting DC/DC converter with 3mV FBX reference; delivers regulated negative output using dual-inductor topology. Use Value: Eliminates need for separate inverting charge-pump IC; achieves <100mV ripple with shielded inductors and ceramic output caps. | Use Scenario: Providing dual-rail ±12V bias for TFT-LCD source/gate drivers in automotive infotainment displays. IC Role / Device Role / Timing Role: SEPIC converter operating with VIN spanning VOUT (e.g., 9–16V input, ±12V outputs); maintains regulation during cold-crank transients. Use Value: Input-to-output isolation inherent in SEPIC topology prevents backfeed during shutdown; supports AEC-Q100-compliant designs. |
| GPS Receivers | DSL Modems |
Use Scenario: Local 3.3V LDO pre-regulator supply derived from 5V USB or 12V vehicle bus for low-noise RF front-end ICs. IC Role / Device Role / Timing Role: High-efficiency boost converter (5V→3.3V @ 200mA) with 1.5MHz switching to minimize EMI near sensitive GNSS antennas. Use Value: Ceramic input/output capacitors and small 15µH inductor enable <8mm² solution size; frequency synchronization avoids interference with GPS L1 band. | Use Scenario: Isolated auxiliary 5V supply for DSL line interface ICs requiring galvanic separation from primary AC-DC stage. IC Role / Device Role / Timing Role: Boost converter with transformer-isolated feedback (via optocoupler or digital isolator) referenced to secondary ground. Use Value: Adjustable UVLO ensures clean startup only after primary supply stabilizes; soft-start prevents inrush into downstream capacitive loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EMSE#PBF | 4-switch synchronous buck-boost controller; no integrated switch; requires external MOSFETs. | Supports wider VIN/VOUT overlap (4V–36V input, ±0.8V–30V output); higher peak efficiency (>95%) but larger solution size. | Choose LTC3780EMSE#PBF when bidirectional voltage conversion, higher efficiency, or >1.5A output is required - not a drop-in replacement. |
| LT3573EDDB#PBF | Integrated 1.5A, 40V switch; fixed 1.2MHz frequency; no SYNC or RT pin; only boost/SEPIC capable (no inverting mode). | Limited topology flexibility; lacks user-adjustable UVLO and frequency foldback; smaller 3mm × 2mm DFN package. | Choose LT3573EDDB#PBF for cost-sensitive, space-constrained boost-only designs where inverting/SEPIC flexibility is unnecessary. |
Compared with LTC3780EMSE#PBF and LT3573EDDB#PBF, the LT8580EDD#PBF uniquely combines inverting capability, programmable frequency, and integrated UVLO in a thermally enhanced DFN - making it optimal for compact, multi-topology bias supplies where layout area and startup reliability are critical.
Availability
LT8580EDD#PBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver power rails, and DSL modem auxiliary supplies requiring stable component supply, automotive-grade temperature range (–40°C to 125°C), and long-term production continuity.
Supply support for LT8580EDD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8580EDD#PBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC converters, designed specifically for compact, high-voltage, multi-topology power conversion in space-constrained and noise-sensitive applications.
FAQ
What is the maximum junction temperature rating for the LT8580EDD#PBF?
The LT8580EDD#PBF is rated for operation from –40°C to 125°C junction temperature. It incorporates overtemperature protection that activates above ~165°C, forcing thermal shutdown and initiating a full soft-start cycle upon cooldown to ~160°C. This specification applies to the "E" grade version indicated by the "E" in the part number LT8580EDD#PBF.
Can the LT8580EDD#PBF be used in an inverting configuration without external op-amps?
Yes, the LT8580EDD#PBF supports true inverting operation natively via its dual-amplifier FBX architecture. When configured for inversion, the FBX pin references the internal 3mV negative feedback threshold, and the output voltage is set using RFBX = (|VOUT| + 3mV) / 83.3µA. No external op-amps or level-shifters are required - only passive components per the inverting topology schematic in the datasheet.
What is the minimum on-time specification for the LT8580EDD#PBF and why does it matter?
The LT8580EDD#PBF has a typical minimum on-time of 120ns. This parameter limits the lowest achievable duty cycle and thus constrains the maximum input-to-output voltage ratio in boost mode. For example, at 1.5MHz (667ns period), 120ns minimum on-time restricts maximum duty cycle to ~18%, limiting practical boost ratios unless lower switching frequencies are selected.
How does the LT8580EDD#PBF handle synchronization with an external clock?
The LT8580EDD#PBF accepts external synchronization on the SYNC pin (Pin 8) with logic-high ≥1.3V and logic-low ≤0.4V. When driven within these thresholds, the internal oscillator locks to the external clock frequency, provided fSYNC ≥ 75% of the nominal fOSC. Driving SYNC below 0.4V reverts the device to free-running mode set by the RT resistor.
Is the LT8580EDD#PBF pin-compatible with other members of the LT8580 family?
Yes, the LT8580EDD#PBF shares identical pinout and footprint with all LT8580 variants in the 8-lead DFN package (e.g., LT8580IDD#PBF, LT8580HDD#PBF), including matching electrical connections, thermal pad layout, and PCB land pattern. Temperature grade differences (E/I/H) do not affect mechanical or electrical compatibility.
LT8580EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT8580EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8580EDD#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 LT8580EDD#PBF reliable?
The price and inventory of LT8580EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8580EDD#PBF is usually 5 days.
3.What payment methods are accepted for LT8580EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8580EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8580EDD#PBF?
LT8580EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8580EDD#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 LT8580EDD#PBF?
For technical support, including LT8580EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8580EDD#PBF requirements.
6.How does Aetrix verify that LT8580EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8580EDD#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 LT8580EDD#PBF meets industry standards.
7.What is the process for return or replacement of LT8580EDD#PBF?
All LT8580EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8580EDD#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 LT8580EDD#PBF part is unused and in its original packaging.
Return procedure for LT8580EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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