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Analog Devices Inc. LT8580IMS8E#PBF
- Part No.:
- LT8580IMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8580IMS8E#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,367
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Product details
Overview
LT8580IMS8E#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 external synchronization-used in TFT-LCD bias supplies and GPS receivers.
For engineers reviewing the LT8580IMS8E#PBF datasheet, LT8580IMS8E#PBF pinout, LT8580IMS8E#PBF application, or LT8580IMS8E#PBF equivalent, key selection considerations include its 8-lead MSOP package with exposed GND pad, 1.204V positive feedback reference, 400mV typical VCE(SAT) at 0.75A, user-programmable UVLO via SHDN pin, and compatibility with ceramic output capacitors down to 0.47µF.
Technical Context
The LT8580IMS8E#PBF employs constant-frequency current-mode control with internal slope compensation, enabling stable operation up to 50% duty cycle and supporting discontinuous conduction mode for extended voltage range. Its dual-amplifier FBX architecture allows seamless reconfiguration between noninverting (boost/SEPIC) and inverting topologies by changing only the RFBX connection polarity and value.
Startup sequencing is managed 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) when FBX voltage falls within 300mV–920mV-ensuring controlled current rise and avoiding instability during undervoltage 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 without pre-regulation. |
| Switch Rating | 1A, 65V NPN - enables high-voltage boost (e.g., 5V→12V) and SEPIC operation where VIN may be above or below VOUT. |
| Feedback Reference | 1.204V (positive), 3mV (negative) - sets precise output regulation thresholds; RFBX calculation differs per topology to maintain accuracy. |
| Switching Frequency | 200kHz to 1.5MHz - adjustable via RT resistor or external SYNC clock; higher frequencies allow smaller magnetics and faster transient response. |
| VCE(SAT) | 400mV at 0.75A (typical) - minimizes conduction loss in high-current phases, directly improving efficiency in 12V@200mA boost applications. |
| Soft-Start Time | Controlled by external CSS capacitor - 100nF–1µF range sets ramp duration; prevents inrush current into output capacitance during power-up. |
| UVLO Threshold | User-configurable via SHDN pin divider - active hysteresis (40mV) avoids oscillation near turn-on point; enables system-level brownout protection. |
Pinout & Package
LT8580IMS8E#PBF is housed in an 8-lead plastic MSOP package (MS8E) with exposed thermal pad (Pin 9 = GND), θJA = 35°C/W to 40°C/W. The exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (Pin 1) | Positive/Negative Feedback Input | Accepts either 1.204V-referenced (noninverting) or 3mV-referenced (inverting) feedback; determines output regulation mode and RFBX value. |
| VC (Pin 2) | Error Amplifier Output | Connects to RC-C network for loop compensation; sets peak switch current via transconductance amplifier (200 µmhos). |
| VIN (Pin 3) | Main Power Input | Supplies internal circuitry and switch driver; requires local 2.2µF ceramic bypass capacitor placed adjacent to pin. |
| SW (Pin 4) | Switch Collector Node | High-slew-rate node driving external inductor/diode; trace area must be minimized to reduce EMI radiation. |
| SHDN (Pin 5) | Enable/Shutdown Control | High-gain input accepts slow-ramping signals; 1.21V–1.40V window with 40mV hysteresis enables robust UVLO implementation. |
| RT (Pin 6) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency; 56.2kΩ yields 1.5MHz, 422kΩ yields 200kHz - no floating allowed. |
| SS (Pin 7) | Soft-Start Capacitor Terminal | Internal 280kΩ current source charges external capacitor; voltage ramp controls startup current slew rate. |
| SYNC (Pin 8) | External Clock Input | Accepts 0.4V–1.3V logic levels; synchronizes switching to external clock or reverts to internal oscillator when driven low. |
| GND (Exposed Pad, Pin 9) | 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 inverting configurations via external component reconnection - eliminates need for multiple part numbers. |
| Frequency Synchronization | SYNC pin accepts external clock up to 1.5MHz with 35%–65% duty cycle tolerance - enables EMI reduction through spread-spectrum or fixed-frequency coordination. |
| Integrated Soft-Start | Programmable ramp via CSS capacitor prevents output overshoot and limits inrush into load capacitance - critical for sensitive display bias rails. |
| Adjustable UVLO | SHDN pin bias current (9–56 µA) allows resistor-divider programming of turn-on voltage - supports custom brownout thresholds across input ranges. |
| Current-Mode Stability | Internal slope compensation eliminates subharmonic oscillation above 50% duty cycle - ensures robust regulation in SEPIC and high-VOUT boost designs. |
Applications
| TFT-LCD Bias Supply | GPS Receiver Power |
|---|---|
Use Scenario: Generating +12V and –5V rails from a 3.3V or 5V battery-powered source for LCD panel gate/source drivers and analog front-end circuitry. IC Role / Device Role / Timing Role: LT8580IMS8E#PBF operates in dual-inductor inverting configuration to produce clean negative output, while boost/SEPIC variants generate positive bias voltages. Use Value: Low output ripple (<50mVPP) due to series output inductor; 85% typical efficiency at 200mA enables compact, thermally efficient display subsystems. |
Use Scenario: Providing regulated 3.3V or 5V supply to GPS RF modules and baseband processors in automotive telematics units with wide input voltage variation (9V–16V). IC Role / Device Role / Timing Role: LT8580IMS8E#PBF configured as SEPIC converter maintains regulation during cold-crank (down to 2.55V) and load-dump (up to 40V) events. Use Value: Wide 2.55V–40V input range and AEC-Q100 qualification ensure uninterrupted satellite signal acquisition under harsh automotive electrical conditions. |
| DSL Modem Local Supply | VFD Display Bias Generation |
Use Scenario: Deriving isolated 12V and –12V rails from 12V wall adapter for line-driver amplifiers and analog signal conditioning in broadband DSL modems. IC Role / Device Role / Timing Role: LT8580IMS8E#PBF used in SEPIC topology provides inherent input-output isolation and stable output despite input ripple from unregulated AC/DC stage. Use Value: 1.5MHz switching frequency enables use of 15µH shielded inductors <3mm × 3mm footprint - reduces board space vs. lower-frequency alternatives. |
Use Scenario: Generating high-impedance, low-noise –20V to –30V bias for vacuum fluorescent display (VFD) grids and segments in industrial HMI panels. IC Role / Device Role / Timing Role: LT8580IMS8E#PBF configured as inverting converter delivers negative output with minimal external components; FBX pin referenced to –3mV enables accurate regulation. Use Value: 400mV VCE(SAT) and integrated soft-start prevent grid flash during power-up; MSOP package allows placement near VFD connector for shortest high-voltage trace runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3580EMS8E#PBF | Pin-compatible predecessor with identical pinout and function; lacks frequency foldback and has narrower 250kHz–2MHz range. | Same boost/SEPIC/inverting capability but less robust startup under light-load or low-VIN conditions. | Select LT3580EMS8E#PBF only if legacy design reuse is required and foldback functionality is unnecessary. |
| LT8330EMSE#PBF | 5A, 100V monolithic converter in 16-lead MSE package; supports wider 3V–40V input and includes integrated MOSFET driver. | Higher current capability suits 500mA+ loads; not pin-compatible and requires different compensation and layout. | Choose LT8330EMSE#PBF when scaling output current beyond 200mA or requiring >1A switch capability in new designs. |
Compared with LT3580EMS8E#PBF, LT8580IMS8E#PBF adds frequency foldback and tighter SHDN hysteresis for improved startup reliability; versus LT8330EMSE#PBF, it offers smaller footprint and lower quiescent current (1.7mA vs 2.5mA) at the cost of reduced current rating.
Availability
LT8580IMS8E#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, industrial, and communications equipment lifecycles.
Supply support for LT8580IMS8E#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 precision instrumentation, industrial automation, and automotive safety markets since 1965.
The LT8580IMS8E#PBF belongs to the LT® switching regulator product line, designed specifically for high-voltage, multi-topology DC/DC conversion in space-constrained and thermally demanding applications such as display bias and telecom infrastructure.
FAQ
What is the maximum output current achievable with LT8580IMS8E#PBF in boost configuration?
The LT8580IMS8E#PBF supports up to 1.2A switch current limit, but practical output current depends on topology, input/output voltage, and efficiency. In a 5V-to-12V boost configuration at 1.5MHz, typical continuous output is 200mA with >85% efficiency. Higher currents require careful thermal management and may trigger current limiting or thermal shutdown.
Can LT8580IMS8E#PBF be used in an inverting configuration without polarity reversal on the FBX pin?
No. The LT8580IMS8E#PBF requires explicit polarity reversal: for inverting operation, RFBX must connect from VOUT to FBX to pull the pin to –3mV reference, activating amplifier A2. Noninverting (boost/SEPIC) uses +1.204V reference with RFBX pulling FBX toward VOUT. Incorrect connection causes regulation failure.
What is the minimum recommended inductance for LT8580IMS8E#PBF operating at 1.5MHz in SEPIC topology?
For 1.5MHz SEPIC operation with 5V input and 12V output at 200mA, minimum inductance is calculated as ~15µH to avoid subharmonic oscillation and ensure adequate current delivery. Coilcraft XAL5050-152ME or Würth WE-PD 744778315 are validated choices meeting DCR <150mΩ and saturation current >1.5A.
Does LT8580IMS8E#PBF support synchronization to a 500kHz external clock?
Yes. The LT8580IMS8E#PBF SYNC pin accepts external clocks from 200kHz to 1.5MHz. A 500kHz clock meets the minimum fSYNC/fOSC ratio of 3/4 when internal oscillator is set ≥667kHz, and satisfies logic thresholds (high >1.3V, low <0.4V) with standard CMOS/TTL drivers.
How does the exposed thermal pad on LT8580IMS8E#PBF affect thermal performance?
The exposed pad (Pin 9) on LT8580IMS8E#PBF is electrically and thermally connected to GND. When soldered to a ≥1cm² PCB copper pour, it reduces θJA from 40°C/W to ≤25°C/W, enabling full 1.2A switch current at ambient temperatures up to 85°C without derating.
LT8580IMS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT8580IMS8E#PBF FAQ
1.How can I place an order for LT8580IMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8580IMS8E#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 LT8580IMS8E#PBF reliable?
The price and inventory of LT8580IMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8580IMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT8580IMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8580IMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8580IMS8E#PBF?
LT8580IMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8580IMS8E#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 LT8580IMS8E#PBF?
For technical support, including LT8580IMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8580IMS8E#PBF requirements.
6.How does Aetrix verify that LT8580IMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8580IMS8E#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 LT8580IMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT8580IMS8E#PBF?
All LT8580IMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8580IMS8E#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 LT8580IMS8E#PBF part is unused and in its original packaging.
Return procedure for LT8580IMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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