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Analog Devices Inc. LT8580EMS8E#PBF
- Part No.:
- LT8580EMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8580EMS8E#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,511
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Product details
Overview
LT8580EMS8E#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 frequency (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 LT8580EMS8E#PBF datasheet, LT8580EMS8E#PBF pinout, LT8580EMS8E#PBF application, or LT8580EMS8E#PBF equivalent, key selection considerations include its 8-lead MSOP package, ±3mV negative FBX reference for inverting configurations, 400mV VCE(SAT) at 0.75A, SHDN pin hysteresis of 40mV, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LT8580EMS8E#PBF employs constant-frequency current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its dual-amplifier FBX architecture enables seamless reconfiguration between noninverting (1.204V reference) and inverting (±3mV reference) feedback modes by changing external resistor connections.
It integrates a precision SHDN comparator with 40mV hysteresis and user-programmable UVLO via external resistor divider, plus a 280kΩ internal SS charging current source that ramps the SS pin to ~2.1V for controlled start-up. Frequency foldback reduces fSW to 1/6 nominal when FBX voltage falls within 300–920mV during soft-start or fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.55V to 40V - supports wide industrial and automotive battery-fed inputs including 12V and 24V rails. |
| Switch Rating | 1A continuous, 65V collector-emitter - enables high-voltage boost and SEPIC designs without external switch. |
| VCE(SAT) | 400mV at 0.75A - minimizes conduction loss and thermal stress in high-current operation. |
| Switching Frequency | 200kHz to 1.5MHz - adjustable via RT resistor or external SYNC clock for EMI optimization and size reduction. |
| Feedback Reference | 1.204V (noninverting) or ±3mV (inverting) - enables precise output regulation in both polarity configurations. |
| Soft-Start Current | 6µA typical - sets ramp rate of SS pin voltage for controlled inrush current limiting. |
| SHDN Threshold Hysteresis | 40mV - prevents chatter during slow-rising enable signals and improves noise immunity. |
Pinout & Package
LT8580EMS8E#PBF is housed in an 8-lead plastic MSOP package (MS8E) with exposed pad (Pin 9 = GND), θJA = 35–40°C/W, and RoHS-compliant lead-free finish. 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 reference (boost/SEPIC) or ±3mV reference (inverting); sets output voltage via single resistor RFBX. |
| VC (Pin 2) | Error Amplifier Output | Connects to external RC compensation network; controls peak switch current to maintain regulation. |
| 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-slew-rate NPN collector output; must minimize trace area to reduce EMI and parasitic inductance. |
| SHDN (Pin 5) | Enable/Shutdown Control | Active-high logic with 1.21–1.40V threshold range and 40mV hysteresis; supports slow-ramping control signals. |
| RT (Pin 6) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency; 56.2kΩ yields 1.5MHz, 422kΩ yields 200kHz. |
| SS (Pin 7) | Soft-Start Capacitor Node | Charged by 6µA current to ~2.1V; external capacitor (100nF–1µF) controls output voltage ramp time. |
| SYNC (Pin 8) | External Clock Input | Accepts 0.4–1.3V logic-low/high; synchronizes switching to external clock or reverts to internal oscillator when pulled low. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-Topology Flexibility | Single IC supports boost, SEPIC, and inverting configurations via external component re-routing - eliminates need for multiple part numbers. |
| Programmable UVLO | SHDN pin accepts resistor divider from VIN to set custom undervoltage lockout threshold - enables system-level brown-out protection. |
| Frequency Foldback | Automatically reduces switching frequency to 1/6 nominal when FBX voltage is 300–920mV - improves controllability during start-up or overload. |
| Thermally Enhanced MSOP | 8-lead MSOP with exposed GND pad achieves θJA ≤ 40°C/W - sustains 1A switching current without external heatsink in compact layouts. |
| AEC-Q100 Qualified | Rated for –40°C to +125°C junction temperature with automotive-grade process controls - suitable for infotainment and ADAS power rails. |
Applications
| TFT-LCD Bias Supply | GPS Receiver Power |
|---|---|
Use Scenario: Generating stable ±15V bias rails from a 3.3V or 5V system supply for LCD gate/source drivers. IC Role / Device Role / Timing Role: LT8580EMS8E#PBF operates in inverting configuration to produce negative rail, paired with boost for positive rail - dual-rail generation from single IC footprint. Use Value: Eliminates need for separate inverting charge-pump IC; ±3mV FBX reference ensures tight regulation across temperature for display contrast stability. |
Use Scenario: Providing clean, low-noise 3.3V or 5V supply to GPS RF front-end and baseband ICs in portable navigation devices. IC Role / Device Role / Timing Role: LT8580EMS8E#PBF configured as high-efficiency boost converter with 1.5MHz switching - minimizes inductor size and avoids AM/FM band interference. Use Value: 400mV VCE(SAT) and integrated soft-start reduce input ripple and inrush current - preserves GNSS signal acquisition integrity during cold start. |
| DSL Modem Local Supply | VFD Display Bias Generator |
Use Scenario: Deriving isolated 12V and –12V rails from 5V USB or wall adapter input for DSL line driver amplifiers. IC Role / Device Role / Timing Role: LT8580EMS8E#PBF used in SEPIC topology to maintain regulation across varying line impedance and input droop - no DC path between input and output. Use Value: Built-in output disconnect during shutdown prevents backfeed into upstream 5V supply - meets DSL Forum safety compliance requirements. |
Use Scenario: Generating high-voltage AC waveform (e.g., 30–60VPP) for vacuum fluorescent display segment/anode drive from 5V microcontroller rail. IC Role / Device Role / Timing Role: LT8580EMS8E#PBF configured as boost converter driving transformer-coupled output stage - leverages 65V switch rating for safe flyback energy handling. Use Value: 1.5MHz max switching frequency allows use of miniature 15µH shielded inductor - enables ultra-thin VFD module designs in consumer appliances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EMS#PBF | Requires external MOSFETs; supports higher output current (>5A) but lacks integrated switch and inverting capability. | Suitable for high-power boost/SEPIC where efficiency >95% is critical; not drop-in for LT8580EMS8E#PBF's 1A integrated-switch use cases. | Select LTC3780EMS#PBF only when board space allows discrete FET layout and load exceeds 1.2A. |
| LT3580EMS8E#PBF | Pin-compatible predecessor with identical pinout, same 1A/65V switch, but fixed 1.2MHz frequency and no SYNC input. | Valid for legacy designs requiring no frequency synchronization or foldback; lacks SHDN hysteresis and updated UVLO flexibility. | LT3580EMS8E#PBF is a direct functional subset - choose only if design does not require programmable fSW or enhanced SHDN behavior. |
Compared with LTC3780EMS#PBF and LT3580EMS8E#PBF, the LT8580EMS8E#PBF uniquely combines integrated 1A/65V switching, triple-topology support, SYNC capability, and programmable UVLO in an MSOP-8 package - making it optimal for space-constrained, multi-rail, and automotive-qualified applications where discrete solutions add cost and complexity.
Availability
LT8580EMS8E#PBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver power management, and DSL modem local supplies requiring stable component supply, automotive-grade reliability, and compact high-voltage DC/DC conversion.
Supply support for LT8580EMS8E#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 with precision power, signal chain, and RF solutions.
The LT8580EMS8E#PBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC converters, designed specifically for high-voltage, multi-topology power conversion in space- and reliability-constrained applications such as automotive infotainment and portable instrumentation.
FAQ
What topologies does the LT8580EMS8E#PBF support?
The LT8580EMS8E#PBF supports three distinct DC/DC topologies: boost, SEPIC, and inverting - selectable solely by external component configuration. Its dual-reference FBX pin (1.204V for noninverting, ±3mV for inverting) and single feedback resistor simplify design across all modes. No internal register programming or external mode pins are required, and the LT8580EMS8E#PBF maintains full 1A/65V switch capability in each configuration.
How is the switching frequency set on the LT8580EMS8E#PBF?
The LT8580EMS8E#PBF switching frequency is set either by connecting a resistor from the RT pin to ground (free-running mode) or by applying an external clock to the SYNC pin (synchronized mode). In free-running mode, 56.2kΩ yields 1.5MHz and 422kΩ yields 200kHz. In synchronized mode, the LT8580EMS8E#PBF locks to external clocks between 200kHz and 1.5MHz with 35–65% duty cycle tolerance. The LT8580EMS8E#PBF automatically reverts to internal oscillator if SYNC falls below 0.4V.
What is the purpose of the SHDN pin hysteresis in the LT8580EMS8E#PBF?
The SHDN pin of the LT8580EMS8E#PBF features 40mV hysteresis between turn-on (1.21–1.40V rising) and turn-off (1.21–1.40V falling) thresholds to prevent oscillation during slowly varying or noisy enable signals. This allows direct connection to microcontroller GPIOs or resistive dividers without added Schmitt-trigger circuitry. The LT8580EMS8E#PBF also restarts soft-start upon each valid SHDN assertion, ensuring repeatable inrush control - critical for systems with marginal input capacitance.
Can the LT8580EMS8E#PBF be used in automotive applications?
Yes, the LT8580EMS8E#PBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to +125°C) and manufactured under controlled automotive processes. It includes overtemperature protection (trip at ~165°C), robust UVLO with programmable hysteresis, and high-reliability packaging. The LT8580EMS8E#PBF is specified for use in infotainment displays, telematics power rails, and ADAS sensor bias supplies - and appears in Analog Devices' official automotive reliability reports.
What is the minimum recommended inductor value for LT8580EMS8E#PBF in boost mode?
For boost operation, the LT8580EMS8E#PBF requires inductors sized to avoid subharmonic oscillation and ensure adequate load current. At 1.5MHz and 50% duty cycle, minimum inductance is ~1.2µH (calculated per LMIN = VIN / [1.25 × (DC − 300ns × f) × f × (2DC − 1)/(1 − DC)]). Typical designs use 15µH (as in the 5V→12V reference circuit) to balance ripple, efficiency, and transient response. The LT8580EMS8E#PBF datasheet recommends ferrite-based shielded inductors like Coilcraft XAL5050 or Würth WE-PD series.
LT8580EMS8E#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
LT8580EMS8E#PBF FAQ
1.How can I place an order for LT8580EMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8580EMS8E#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 LT8580EMS8E#PBF reliable?
The price and inventory of LT8580EMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8580EMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT8580EMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8580EMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8580EMS8E#PBF?
LT8580EMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8580EMS8E#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 LT8580EMS8E#PBF?
For technical support, including LT8580EMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8580EMS8E#PBF requirements.
6.How does Aetrix verify that LT8580EMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8580EMS8E#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 LT8580EMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT8580EMS8E#PBF?
All LT8580EMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8580EMS8E#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 LT8580EMS8E#PBF part is unused and in its original packaging.
Return procedure for LT8580EMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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