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Analog Devices Inc. LT8580IDD#PBF
- Part No.:
- LT8580IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8580IDD#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:594
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Product details
Overview
LT8580IDD#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 1.2A switch current, supports 200kHz–1.5MHz switching (adjustable via RT pin or external SYNC), and features soft-start, frequency foldback, and programmable UVLO - used in TFT-LCD bias supplies and GPS receivers.
For engineers reviewing the LT8580IDD#PBF datasheet, LT8580IDD#PBF pinout, LT8580IDD#PBF application, or LT8580IDD#PBF equivalent, key selection considerations include its 8-lead 3mm × 3mm DFN package, –40°C to 125°C operating range, 1.204V positive FBX reference, 400mV typical VCE(SAT) at 0.75A, and compatibility with high-frequency ceramic output capacitors for low ripple.
Technical Context
The LT8580IDD#PBF uses constant-frequency current-mode control with internal slope compensation to ensure stability at duty cycles >50%. Its dual-path feedback architecture (1.204V for noninverting, 3mV for inverting configurations) enables seamless topology reconfiguration without component changes.
It integrates a precision SHDN pin with 40mV hysteresis and programmable UVLO, a 280kΩ internal soft-start pull-up, and frequency foldback that reduces fSW to 1/6 nominal when FBX voltage falls between 300mV and 920mV - critical for controlled start-up under light loads or high-output-voltage 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 and 24V systems. |
| Switch Rating | 1A continuous, 65V max - enables high-step-up ratios in boost and robust operation in SEPIC/inverting topologies. |
| Switch VCE(SAT) | 400mV at 0.75A - minimizes conduction loss and thermal stress in high-current applications. |
| Feedback Reference | 1.204V (positive), ±3mV (negative) - sets precise output regulation thresholds for both polarity configurations. |
| Switching Frequency | 200kHz to 1.5MHz - adjustable via RT resistor or external SYNC clock for EMI optimization and size reduction. |
| Soft-Start Current | 6µA typical - controls ramp rate of SS pin voltage to limit inrush current during startup. |
| Operating Temp Range | –40°C to 125°C - qualified for extended-temperature industrial and automotive environments. |
Pinout & Package
LT8580IDD#PBF is housed in an 8-lead, 3mm × 3mm plastic DFN package with exposed pad (Pin 9 = GND), optimized for thermal performance (θJA = 43°C/W). The exposed pad must be soldered directly to the PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Positive/Negative Feedback Input | Accepts either 1.204V-referenced (boost/SEPIC) or 3mV-referenced (inverting) feedback; determines output voltage via single resistor RFBX. |
| VC (2) | Error Amplifier Output | Connects to external RC compensation network; sets loop stability and transient response. |
| VIN (3) | Main Power Input | Supplies internal circuitry and switch driver; requires local 2.2µF ceramic bypass capacitor. |
| SW (4) | Switch Collector Node | Drives external inductor/diode; high di/dt node requiring minimized trace area to reduce EMI. |
| SHDN (5) | Enable/UVLO Control Input | Active-high shutdown with 1.21V–1.40V threshold window; supports slow-ramping input signals. |
| RT (6) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency; also accepts external SYNC clock signal. |
| SS (7) | Soft-Start Capacitor Terminal | Charged by internal 280kΩ current source; external capacitor sets startup time and inrush control. |
| SYNC (8) | External Clock Input | Accepts 0.4V–1.3V logic-level clock; synchronizes switching to avoid beat frequencies in multi-regulator systems. |
| GND (9, Exposed Pad) | Power & Signal Ground | Primary thermal path and reference node; must be solidly connected to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, SEPIC, and inverting configurations via external component reconnection - eliminates need for multiple part numbers. |
| Programmable UVLO | User-configurable undervoltage lockout using external resistor divider on SHDN pin - enables system-level brown-out protection. |
| Frequency Foldback | Automatically reduces switching frequency to 1/6 nominal during soft-start or light-load conditions - improves controllability at low duty cycles. |
| High-Gain SHDN Interface | Accepts slowly varying input signals (e.g., thermistor-based enable) without false triggering - simplifies power sequencing design. |
| Thermally Enhanced DFN | 3mm × 3mm package with exposed GND pad achieves 43°C/W junction-to-ambient - enables high-power density without heatsinks. |
Applications
| TFT-LCD Bias Supply | GPS Receiver Power |
|---|---|
Use Scenario: Generating stable ±15V rails from a 3.3V or 5V battery-powered source for LCD panel gate/source drivers. IC Role / Device Role / Timing Role: LT8580IDD#PBF operates in inverting configuration to produce negative bias while simultaneously supporting positive rail via SEPIC or cascaded stage. Use Value: Single-chip solution eliminates discrete charge pumps; 400mV VCE(SAT) ensures efficiency >83% at 100mA load, reducing thermal load in compact handheld displays. | Use Scenario: Providing regulated 3.3V and 5V outputs from a variable 7V–28V vehicle battery for GNSS front-end and baseband ICs. IC Role / Device Role / Timing Role: LT8580IDD#PBF configured as high-efficiency boost converter with SYNC pin locked to system clock to suppress conducted EMI in RF-sensitive receivers. Use Value: 200kHz–1.5MHz adjustable frequency avoids GPS L1 band (1.575GHz) harmonics; –40°C to 125°C rating ensures cold-cranking and under-hood reliability. |
| DSL Modem Local Supply | VFD Bias Supply |
Use Scenario: Generating isolated 12V and –12V rails from 5V USB or PoE-derived input for line-driver amplifiers and analog front-ends. IC Role / Device Role / Timing Role: LT8580IDD#PBF used in dual-inductor inverting topology to deliver low-noise, ripple-free negative rail with inherent output disconnect during shutdown. Use Value: Dual inductor configuration eliminates abrupt output capacitor current steps - reduces conducted noise below CISPR-22 Class B limits without added filtering. | Use Scenario: Driving vacuum fluorescent display segments requiring 20V–30V anode voltage and –10V cathode bias from 5V microcontroller supply. IC Role / Device Role / Timing Role: LT8580IDD#PBF configured as high-voltage boost converter with external diode and capacitor multiplier to achieve >25V output at 5mA. Use Value: 65V switch rating allows direct use of low-cost Schottky diodes; soft-start prevents filament surge current - extends VFD lifetime in industrial HMIs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3533EDD#PBF | Lower 40V switch rating; fixed 1.2MHz frequency; no SYNC pin; 0.8A switch current. | Suitable only for ≤12V output boost; lacks synchronization and topology flexibility. | Select if fixed-frequency, lower-voltage, cost-sensitive designs prioritize simplicity over configurability. |
| LT3580EDD#PBF | Pin-compatible predecessor; identical pinout and function but rated only to 125°C (no I-grade); lacks AEC-Q100 qualification. | Acceptable for commercial-temperature applications where automotive qualification is not required. | Choose only for legacy redesigns where LT8580IDD#PBF's extended temp range and automotive qualification are unnecessary. |
Compared with LTC3533EDD#PBF and LT3580EDD#PBF, the LT8580IDD#PBF offers broader input range (2.55V–40V vs. 3V–40V), higher switch current (1.2A vs. 0.8A), full topology reconfigurability, and AEC-Q100 qualification - making it uniquely suited for next-generation automotive and industrial bias supplies demanding reliability and design reuse.
Availability
LT8580IDD#PBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver power management, and DSL modem local power conversion requiring stable component supply across automotive and industrial temperature grades.
Supply support for LT8580IDD#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 LT8580 product line delivers highly integrated, thermally efficient DC/DC controllers for space-constrained, high-reliability applications - specifically engineered for bias generation in displays, RF modules, and telecom infrastructure where topology flexibility and extended temperature operation are essential.
FAQ
What topologies does the LT8580IDD#PBF support?
The LT8580IDD#PBF supports three distinct DC/DC topologies: boost, SEPIC, and inverting - selectable solely by external component configuration. Its dual-path feedback architecture (1.204V for noninverting, 3mV for inverting modes) enables this flexibility without changing the IC. Each topology leverages the same 1A, 65V internal NPN switch and current-mode control loop, ensuring consistent performance across configurations. Designers can implement output disconnect (SEPIC), negative rail generation (inverting), or step-up conversion (boost) using the same LT8580IDD#PBF footprint and bill of materials.
How is the switching frequency set on the LT8580IDD#PBF?
The switching frequency of the LT8580IDD#PBF is set either by connecting a resistor from the RT pin to ground (free-running mode) or by applying an external clock signal to the SYNC pin. In free-running mode, frequency ranges from 200kHz to 1.5MHz depending on RT value (e.g., 56.2kΩ yields ~1.5MHz). When synchronized, the LT8580IDD#PBF locks to the external clock if its high/low levels meet 1.3V/0.4V thresholds and duty cycle stays within 35–65%. The minimum recommended SYNC-to-oscillator frequency ratio is 3/4 to ensure reliable locking.
What is the purpose of the FBX pin on the LT8580IDD#PBF?
The FBX pin on the LT8580IDD#PBF serves as the dual-mode feedback input: it accepts either a positive reference (1.204V typical) for boost/SEPIC configurations or a negative reference (±3mV typical) for inverting topologies. A single resistor (RFBX) connects VOUT to FBX, setting output voltage per RFBX = |VOUT − VFBX| / 83.3µA. This architecture eliminates the need for separate feedback networks or additional op-amps, enabling topology reconfiguration with minimal component changes while maintaining tight regulation accuracy across all modes.
Does the LT8580IDD#PBF require external compensation components?
Yes, the LT8580IDD#PBF requires external compensation components connected between the VC pin and GND. A standard network consists of a series RC (5kΩ–50kΩ + 470pF–2.2nF) in parallel with a small capacitor (10pF–100pF). This compensates the voltage loop, as the internal current loop is self-stabilized. Proper compensation ensures phase margin >45°, preventing oscillation and optimizing transient response. The datasheet recommends starting with 6.04kΩ, 1nF, and 47pF - values validated in the 1.5MHz, 5V-to-12V boost reference design - before fine-tuning based on actual load and layout conditions.
What is the maximum duty cycle limitation for the LT8580IDD#PBF?
The LT8580IDD#PBF has a maximum duty cycle (DCMAX) determined by its minimum off-time of 100ns and switching period TP: DCMAX = (TP − 100ns) / TP × 100%. At 1.5MHz (TP = 667ns), DCMAX ≈ 85%; at 200kHz (TP = 5µs), DCMAX ≈ 98%. Exceeding DCMAX causes loss of regulation and potential instability. The device also enforces a minimum on-time of 120ns, limiting minimum duty cycle - critical for high-input, low-output voltage scenarios. These constraints are topology-independent and apply equally to boost, SEPIC, and inverting configurations of the LT8580IDD#PBF.
LT8580IDD#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)
LT8580IDD#PBF FAQ
1.How can I place an order for LT8580IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8580IDD#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 LT8580IDD#PBF reliable?
The price and inventory of LT8580IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8580IDD#PBF is usually 5 days.
3.What payment methods are accepted for LT8580IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8580IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8580IDD#PBF?
LT8580IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8580IDD#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 LT8580IDD#PBF?
For technical support, including LT8580IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8580IDD#PBF requirements.
6.How does Aetrix verify that LT8580IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8580IDD#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 LT8580IDD#PBF meets industry standards.
7.What is the process for return or replacement of LT8580IDD#PBF?
All LT8580IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8580IDD#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 LT8580IDD#PBF part is unused and in its original packaging.
Return procedure for LT8580IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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