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Analog Devices Inc. LT8580IDD#TRPBF
- Part No.:
- LT8580IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8580IDD#TRPBF.pdf
- Description:
- IC REG BOOST CUK ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,431
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Product details
Overview
LT8580IDD#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 LT8580IDD#TRPBF datasheet, LT8580IDD#TRPBF pinout, LT8580IDD#TRPBF application, or LT8580IDD#TRPBF equivalent, key selection considerations include its 65V switch rating, dual-mode feedback (±1.204V / ±3mV), UVLO programmability via SHDN, thermal shutdown at ~165°C, and compatibility with compact 3mm × 3mm DFN packaging for space-constrained industrial and automotive power rails.
Technical Context
The LT8580IDD#TRPBF employs constant-frequency current-mode control with internal slope compensation, enabling stable operation up to 50% duty cycle without subharmonic oscillation. Its dual-path error amplifier (A1/A2) supports both noninverting (boost/SEPIC) and inverting configurations by selecting FBX reference polarity - 1.204V for positive regulation or 3mV for negative output generation.
Switching frequency is set via RT-to-GND resistor (e.g., 56.2kΩ yields 1.5MHz) or synchronized externally through SYNC pin (1.3V high threshold, 0.4V low). Frequency foldback activates when FBX voltage falls between 300mV–920mV, reducing fOSC to 1/6 nominal to improve startup control under light load or high-duty-cycle conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.55V to 40V - supports wide-input industrial and automotive battery-supplied systems including 12V/24V rails with cold-crank margin. |
| Switch Rating | 1A continuous, 65V VSW max - enables high-voltage boost (e.g., 5V→48V) and robust SEPIC operation across input/output crossover. |
| Feedback Reference | 1.204V (positive) or 3mV (negative) - allows single-resistor VOUT programming for both polarities without external op-amps. |
| Switch VCE(SAT) | 400mV at 0.75A - minimizes conduction loss in high-current paths, supporting >85% efficiency at 200mA load in 5V→12V boost. |
| Operating Temp Range | –40°C to +125°C junction - qualified for extended-temperature industrial and AEC-Q100-compliant automotive applications. |
| Switching Frequency | 200kHz to 1.5MHz - selectable via RT resistor or external clock; higher frequencies enable smaller magnetics and reduced EMI filtering area. |
| Soft-Start Time | Programmable via SS capacitor (e.g., 100nF → ~28ms ramp) - prevents inrush current and output overshoot during power-up. |
Pinout & Package
LT8580IDD#TRPBF is housed in an 8-lead, 3mm × 3mm plastic DFN package with exposed GND pad (Pin 9) requiring solder connection to PCB ground plane for thermal and electrical performance. θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (Pin 1) | Configurable feedback input | Accepts either positive (1.204V ref) or negative (3mV ref) feedback voltage - selects topology mode and sets output via single RFBX. |
| VC (Pin 2) | Error amplifier output | Connects external RC compensation network; sets loop stability for boost/SEPIC/inverting configurations. |
| VIN (Pin 3) | Main input supply | 2.55V–40V input rail; requires local 2.2µF ceramic bypass capacitor placed adjacent to pin. |
| SW (Pin 4) | Internal NPN switch collector | High-slew node driving external inductor/diode; trace must be short and shielded to minimize EMI radiation. |
| SHDN (Pin 5) | Enable/disable control with UVLO | Hysteresis of 40mV; rising threshold 1.23–1.40V - supports resistor-divider-based programmable undervoltage lockout. |
| RT (Pin 6) | Oscillator timing input | Resistor-to-GND sets free-running frequency; open-circuit disables oscillator - must not float. |
| SS (Pin 7) | Soft-start capacitor node | Charged by internal 280kΩ current source to ~2.1V; external capacitor determines ramp time and inrush control. |
| SYNC (Pin 8) | External clock input | Accepts 0.4V–1.3V logic-level sync signal; drives internal oscillator when high - reverts to RT-set frequency when low. |
| GND (Pin 9, Exposed Pad) | Power and signal ground | Thermal and electrical reference; must be soldered to large PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, SEPIC, and dual-inductor inverting topologies - eliminates need for multiple part numbers in multi-rail designs. |
| Programmable UVLO | SHDN pin accepts slow-rising inputs and enables user-defined turn-on voltage via resistor divider - simplifies battery-monitoring interface. |
| Frequency Foldback | Reduces switching frequency to 1/6 nominal during startup or light-load conditions - improves minimum on-time control and reduces output overshoot. |
| Low Quiescent Current | 1.7mA operating / 1µA shutdown - extends battery life in always-on GPS or sensor nodes powered from 3.3V/5V rails. |
| Robust Switch Protection | Integrated current limit (1.2A typ. at 50% duty cycle) and thermal shutdown (~165°C) - protects against overload and PCB overheating without external circuitry. |
Applications
| TFT-LCD Bias Supply | GPS Receiver Power |
|---|---|
Use Scenario: Generating +12V and –5V rails from a single 3.3V or 5V source for LCD panel gate/source drivers and level shifters. IC Role / Device Role / Timing Role: Configured as dual-output inverting/boost converter; FBX pin selects polarity per rail using shared SW node and discrete diodes. Use Value: Eliminates need for separate positive/negative charge pumps; achieves <15mV ripple via L2-series output filtering and 1.5MHz switching. |
Use Scenario: Providing regulated 3.3V output from automotive battery (9V–16V) with cold-crank tolerance down to 4.5V during engine start. IC Role / Device Role / Timing Role: Operated in SEPIC topology to maintain regulation when VIN dips below VOUT; RT resistor sets 600kHz for optimal EMI vs. efficiency trade-off. Use Value: Maintains continuous GPS module operation during cranking transients; UVLO hysteresis prevents erratic cycling near dropout threshold. |
| DSL Modem Local Supply | VFD Display Bias Generator |
Use Scenario: Deriving isolated 12V/–12V outputs from 5V USB-powered DSL modem main board for line driver amplifiers. IC Role / Device Role / Timing Role: Used in transformerless SEPIC configuration with coupled inductors; SYNC pin locked to system clock to reduce beat-frequency noise in analog front-end. Use Value: Achieves >83% efficiency at 150mA while meeting FCC Class B conducted emissions limits due to deterministic switching frequency. |
Use Scenario: Generating +30V and –15V bias voltages for vacuum fluorescent display anode/grid segments from 5V microcontroller rail. IC Role / Device Role / Timing Role: Configured as cascaded boost + inverting stage; soft-start capacitor (470nF) ensures controlled ramp to prevent filament overcurrent during power-up. Use Value: Enables full brightness control without display flicker; 65V switch rating accommodates VOUT headroom for aging compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | 4-switch synchronous buck-boost controller; no integrated switch; requires external MOSFETs and gate drivers. | Supports higher output currents (>5A) and wider VIN/VOUT ratios but demands more layout complexity and BOM count. | Select when >2A output or >95% efficiency is required; not drop-in - redesign of power stage and compensation needed. |
| LT3573EDD#PBF | 60V, 1.2A monolithic boost/SEPIC/inverting converter; fixed 1.2MHz fSW; no SYNC or RT pin; lower quiescent current (700µA). | Lacks frequency synchronization and programmable UVLO; optimized for ultra-low-IQ portable applications rather than automotive robustness. | Choose for battery-powered IoT sensors where size and standby power dominate; not suitable for sync-critical or wide-temp automotive use. |
Compared with LTC3780EFE#PBF and LT3573EDD#PBF, the LT8580IDD#TRPBF uniquely balances integrated 65V/1A switching, topology flexibility, and automotive-grade temperature range in a 3mm × 3mm DFN - making it optimal for space-constrained, multi-rail industrial power where design simplicity and transient resilience are prioritized over peak efficiency or ultra-low IQ.
Availability
LT8580IDD#TRPBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver power management, and DSL modem local regulation requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT8580IDD#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.
The LT8580IDD#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC converters, designed specifically for reliable, compact, and flexible power conversion in harsh-environment applications demanding wide input range, high-voltage capability, and topology adaptability.
FAQ
What is the maximum duty cycle supported by the LT8580IDD#TRPBF?
The LT8580IDD#TRPBF supports a maximum duty cycle of 80% at 200kHz and 40% at 1.5MHz, calculated as (TP − 100ns)/TP. This limitation arises from the 100ns minimum off-time specification and ensures stable current-mode control. Exceeding DCMAX risks subharmonic oscillation or loss of regulation, especially in SEPIC or inverting topologies where duty cycle exceeds 50%.
Can the LT8580IDD#TRPBF generate negative output voltages?
Yes, the LT8580IDD#TRPBF can generate negative output voltages using its dual-mode FBX pin architecture. When configured in inverting topology, the FBX pin references –3mV (typical), allowing direct resistor-based programming of negative VOUT such as –5V or –12V from a positive input. The internal error amplifier A2 enables stable regulation without external op-amps or level-shifting circuitry.
What is the purpose of the SYNC pin on the LT8580IDD#TRPBF?
The SYNC pin on the LT8580IDD#TRPBF allows external clock synchronization to eliminate beat frequencies and reduce EMI in multi-converter systems. Driving SYNC with a clean 0.4V–1.3V logic signal locks the internal oscillator to the external clock frequency. When SYNC is pulled below 0.4V, the device reverts to its RT-resistor–set free-running frequency - enabling dynamic switching between synchronized and autonomous operation.
How does the LT8580IDD#TRPBF implement programmable undervoltage lockout?
The LT8580IDD#TRPBF implements programmable undervoltage lockout via its SHDN pin, which features a precise 1.23V–1.40V rising threshold with 40mV hysteresis. Connecting a resistor divider from VIN to SHDN allows users to set custom turn-on voltage (e.g., 8.5V for 12V automotive systems). This avoids external supervisor ICs and provides robust startup behavior during brownout conditions.
Is the LT8580IDD#TRPBF pin-compatible with other members of the LT8580 family?
Yes, the LT8580IDD#TRPBF shares identical pinout and footprint with all LT8580 variants in the 8-lead DFN package (e.g., LT8580EDD#TRPBF, LT8580HDD#TRPBF), differing only in temperature grade (–40°C to +125°C for "I" grade). This allows direct substitution in existing layouts when upgrading for extended temperature operation or automotive qualification without PCB revision.
LT8580IDD#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)
LT8580IDD#TRPBF FAQ
1.How can I place an order for LT8580IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8580IDD#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 LT8580IDD#TRPBF reliable?
The price and inventory of LT8580IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8580IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8580IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8580IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8580IDD#TRPBF?
LT8580IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8580IDD#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 LT8580IDD#TRPBF?
For technical support, including LT8580IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8580IDD#TRPBF requirements.
6.How does Aetrix verify that LT8580IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8580IDD#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 LT8580IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8580IDD#TRPBF?
All LT8580IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8580IDD#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 LT8580IDD#TRPBF part is unused and in its original packaging.
Return procedure for LT8580IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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