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Analog Devices Inc. LT8580HMS8E#PBF
- Part No.:
- LT8580HMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8580HMS8E#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:229
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Product details
Overview
LT8580HMS8E#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 LT8580HMS8E#PBF datasheet, LT8580HMS8E#PBF pinout, LT8580HMS8E#PBF application, or LT8580HMS8E#PBF equivalent, key selection considerations include its 8-lead MSOP package with exposed GND pad, –40°C to 150°C automotive-grade junction temperature rating, 400mV typical VCE(SAT) at 0.75A, single-resistor output voltage setting, and SHDN pin tolerance for slowly varying enable signals.
Technical Context
The LT8580HMS8E#PBF uses constant-frequency current-mode control with internal slope compensation to ensure stability across duty cycles up to 80% (at 200kHz) and prevent subharmonic oscillation. Its dual-path FBX architecture enables seamless reconfiguration between noninverting (boost/SEPIC) and inverting topologies by changing only the feedback resistor connection.
It integrates a high-gain SHDN comparator with 40mV hysteresis and user-programmable UVLO via external resistor divider; the SS pin charges via an internal 280kΩ current source to ~2.1V for controlled soft-start; frequency foldback reduces fSW to 1/6 nominal when FBX voltage falls within 300mV–920mV during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.55V to 40V - supports wide-input industrial and automotive rails without pre-regulation. |
| Switch Rating | 1A, 65V NPN - enables high-voltage boost and SEPIC designs with low conduction loss (400mV VCE(SAT) at 0.75A). |
| Switching Frequency | 200kHz to 1.5MHz - adjustable via RT resistor or external SYNC clock; foldback mode reduces min duty cycle for reliable startup. |
| Feedback Reference | 1.204V (noninverting) or 3mV (inverting) - allows single-resistor VOUT programming for both polarity configurations. |
| Operating Temperature | –40°C to +150°C junction - AEC-Q100 qualified H-grade variant suitable for under-hood automotive applications. |
| Quiescent Current | 1.2mA (active), <1µA (shutdown) - minimizes standby power in battery-powered GPS and DSL modem systems. |
| Soft-Start Control | Internal 280kΩ current source charges external SS capacitor - eliminates need for external timing components; ramp time set by CSS value. |
Pinout & Package
LT8580HMS8E#PBF is housed in an 8-lead plastic MSOP package (MS8E) with exposed GND pad (Pin 9), rated θJA = 35–40°C/W. The exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Positive/Negative Feedback Input | Accepts either 1.204V reference (boost/SEPIC) or 3mV reference (inverting); sets output voltage via single resistor RFBX. |
| VC (2) | Error Amplifier Output | Connects to external RC compensation network; controls loop stability and transient response. |
| VIN (3) | Main Power Input | Supplies internal circuitry and switch driver; requires local ceramic bypass (≥2.2µF) near pin. |
| SW (4) | Switch Collector Node | High-slew-rate node connecting to external inductor/diode; minimize trace area to reduce EMI. |
| SHDN (5) | Shutdown/UVLO Enable | High-gain input accepts slow-ramping signals; 1.21V–1.40V threshold window with 40mV hysteresis. |
| RT (6) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency; open-drain SYNC overrides RT when driven low. |
| SS (7) | Soft-Start Capacitor Terminal | Charged internally to ~2.1V; external capacitor (100nF–1µF) controls startup current ramp rate. |
| SYNC (8) | External Clock Input | Accepts 0.4V–1.3V logic-level clock; synchronizes switching to system clock or reduces EMI via spread spectrum. |
| GND (9, Exposed Pad) | Power & Signal Ground | Thermal and electrical reference; must be soldered to large PCB ground plane for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, SEPIC, and inverting configurations via FBX pin biasing - reduces BOM count and design reuse effort. |
| Programmable UVLO | SHDN pin accepts external resistor divider to set precise turn-on voltage - enables custom brown-out protection without extra ICs. |
| Frequency Foldback | Reduces switching frequency to 1/6 nominal when FBX voltage is 300–920mV - improves controllability during light-load or startup conditions. |
| Low-Voltage Startup | Operates down to 2.55V input - supports single-cell Li-ion or 3.3V rail-powered applications like portable GPS receivers. |
| Automotive Qualification | AEC-Q100 Grade H (–40°C to +150°C) - validated for under-dash and infotainment power supply use with full reliability reporting. |
Applications
| TFT-LCD Bias Supply | GPS Receiver Power |
|---|---|
Use Scenario: Generating ±15V bias rails from a 3.3V or 5V system rail for LCD column/row drivers in automotive displays. IC Role / Device Role / Timing Role: LT8580HMS8E#PBF operates in inverting configuration to generate negative rail and boost configuration for positive rail - dual-rail capability from one IC. Use Value: Eliminates need for separate inverting and boost converters; 400mV VCE(SAT) ensures high efficiency at low input voltages critical for battery runtime. |
Use Scenario: Providing regulated 3.3V or 5V supply to GPS baseband ICs and RF front-end modules in portable navigation devices. IC Role / Device Role / Timing Role: LT8580HMS8E#PBF configured as boost converter steps up single-cell Li-ion (2.7–4.2V) to stable 3.3V output with tight load regulation. Use Value: 200kHz–1.5MHz adjustable frequency avoids sensitive GPS L1 band (1.575GHz) harmonics; soft-start prevents cold-start brownout in weak-signal conditions. |
| DSL Modem Local Supply | VFD Bias Supply |
Use Scenario: Generating isolated 12V bias for line-driver amplifiers and PHY interface circuits in residential DSL modems. IC Role / Device Role / Timing Role: LT8580HMS8E#PBF used in SEPIC topology to maintain regulation across wide input range (5–12V AC/DC adapter variation). Use Value: Input-to-output isolation inherent to SEPIC prevents fault propagation; 65V switch rating accommodates transient surges on unregulated inputs. |
Use Scenario: Delivering high-voltage (100–200V) AC or DC bias to vacuum fluorescent display segments in industrial control panels. IC Role / Device Role / Timing Role: LT8580HMS8E#PBF drives transformer-coupled boost stage; synchronized switching minimizes EMI coupling into analog display signals. Use Value: SYNC pin enables phase alignment with system clock to suppress beat frequencies; 150°C rating supports sealed enclosure thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780 | 4-switch synchronous buck-boost controller (external MOSFETs); no integrated switch; wider VIN (4–36V); higher efficiency at >2A loads. | Requires external power stage layout; better suited for high-current (>1.5A), high-efficiency telecom power supplies. | Select LTC3780 when output current exceeds 1.2A or when >92% efficiency is required over wide load range. |
| LT3580 | Pin-compatible predecessor; same 8-lead MSOP footprint; lower max junction temp (125°C vs 150°C); no AEC-Q100 qualification. | Limited to commercial/industrial ambient; not approved for automotive under-hood deployment. | Choose LT3580 only for cost-sensitive non-automotive designs where 125°C operation suffices and AEC-Q100 is not mandated. |
Compared with LTC3780 and LT3580, the LT8580HMS8E#PBF uniquely combines integrated 1A/65V switch, automotive-grade temperature range, and triple-topology flexibility in a thermally enhanced MSOP - making it optimal for space-constrained, high-reliability bias supply designs where external FETs or reduced qualification are unacceptable.
Availability
LT8580HMS8E#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 ranges.
Supply support for LT8580HMS8E#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.
The LT8580HMS8E#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 thermal-constrained automotive and industrial applications.
FAQ
What is the maximum allowable duty cycle for LT8580HMS8E#PBF at 1.5MHz?
The maximum duty cycle for LT8580HMS8E#PBF at 1.5MHz is 80%, calculated from the minimum off-time specification of 100ns. At this frequency (667ns period), DCMAX = (667ns − 100ns)/667ns × 100% ≈ 85%, but the Electrical Characteristics table specifies 0.8A maximum switch current at 50% duty cycle and derates above that - practical design limit is 80% to maintain current limit margin and loop stability. This constraint applies directly to boost and SEPIC configurations per the datasheet's DCMAX equation.
Can LT8580HMS8E#PBF be used in a flyback configuration?
No, LT8580HMS8E#PBF cannot be used in a standard flyback configuration because it lacks a dedicated transformer reset path, isolated feedback interface, or primary-side sensing capability. Its internal NPN switch and FBX architecture are optimized for non-isolated topologies - boost, SEPIC, and inverting - all of which rely on direct output sensing and single-winding inductors. Flyback requires galvanic isolation and a secondary-side optocoupler or auxiliary winding feedback, which the LT8580HMS8E#PBF does not support.
How does the SHDN pin function differ between LT8580HMS8E#PBF and standard enable pins?
The SHDN pin of LT8580HMS8E#PBF features high-gain comparator circuitry with 40mV hysteresis and accepts slowly varying input signals (e.g., from thermistors or RC-delayed supplies), unlike standard CMOS enable pins that require fast logic transitions. Its active-high threshold is 1.21V (falling) to 1.40V (rising), enabling precise UVLO programming via external resistor dividers - a capability not found in basic enable inputs. This design eliminates need for external supervisors in automotive brown-out detection.
What is the purpose of the exposed pad (Pin 9) on LT8580HMS8E#PBF?
The exposed pad (Pin 9) on LT8580HMS8E#PBF is electrically and thermally connected to GND and must be soldered to a PCB ground plane. It provides the primary thermal conduction path - reducing θJA from >60°C/W (no pad connection) to 35–40°C/W - and lowers thermal resistance by up to 50%. It also serves as the main signal return for high-current paths (SW, VIN), minimizing ground bounce and improving EMI performance. Leaving it unconnected violates Absolute Maximum Ratings and risks thermal shutdown or parametric shift.
Is LT8580HMS8E#PBF pin-compatible with LT3580 in MSOP packages?
Yes, LT8580HMS8E#PBF is pin-compatible with LT3580 in the 8-lead MSOP (MS8E) package - identical pinout, footprint, and function mapping per the datasheet's PIN CONFIGURATION diagrams. However, LT8580HMS8E#PBF adds frequency foldback, improved SHDN hysteresis, and AEC-Q100 qualification; users upgrading from LT3580 must verify SYNC and SS timing behavior, as minor functional enhancements exist despite mechanical compatibility.
LT8580HMS8E#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):
- 2.9V
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LT8580HMS8E#PBF FAQ
1.How can I place an order for LT8580HMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8580HMS8E#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 LT8580HMS8E#PBF reliable?
The price and inventory of LT8580HMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8580HMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT8580HMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8580HMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8580HMS8E#PBF?
LT8580HMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8580HMS8E#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 LT8580HMS8E#PBF?
For technical support, including LT8580HMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8580HMS8E#PBF requirements.
6.How does Aetrix verify that LT8580HMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8580HMS8E#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 LT8580HMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT8580HMS8E#PBF?
All LT8580HMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8580HMS8E#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 LT8580HMS8E#PBF part is unused and in its original packaging.
Return procedure for LT8580HMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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