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Analog Devices Inc. LT8580HDD#PBF
- Part No.:
- LT8580HDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8580HDD#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,057
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Product details
Overview
LT8580HDD#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 synchronization capability - used in TFT-LCD bias supplies and GPS receivers.
For engineers reviewing the LT8580HDD#PBF datasheet, LT8580HDD#PBF pinout, LT8580HDD#PBF application, or LT8580HDD#PBF equivalent, key selection considerations include its AEC-Q100-qualified H-grade (–40°C to 150°C), 3mm × 3mm DFN package with exposed thermal pad, 1.204V positive feedback reference, and user-programmable undervoltage lockout via SHDN pin.
Technical Context
The LT8580HDD#PBF employs constant-frequency current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its dual-amplifier FBX architecture supports both noninverting (boost/SEPIC) and inverting configurations by selecting either 1.204V or 3mV reference thresholds.
It integrates frequency foldback during soft-start (reducing fOSC to 1/6 nominal when FBX is 300–920mV), a high-gain SHDN pin accepting slowly ramping enable signals, and thermal shutdown at ~165°C with automatic restart at ~160°C. The VC pin provides direct access to error amplifier output for external compensation.
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, 65V NPN - enables high-voltage boost and SEPIC designs without external switch; VCE(SAT) = 400mV at 0.75A ensures low conduction loss. |
| Switching Frequency | 200kHz to 1.5MHz - set via RT resistor or synchronized externally; foldback reduces minimum duty cycle during startup. |
| Feedback Reference | 1.204V (positive) / 3mV (negative) - enables single-resistor VOUT programming for both boost/SEPIC and inverting topologies. |
| Operating Temperature | –40°C to +150°C junction - H-grade qualification meets AEC-Q100 requirements for under-hood automotive applications. |
| Quiescent Current | 1.2–1.7mA active / <1µA shutdown - minimizes standby power in battery-powered GPS and modem systems. |
| Soft-Start Control | Internal 280kΩ current source charges external SS capacitor - prevents inrush current; typical ramp to 2.1V. |
Pinout & Package
LT8580HDD#PBF is housed in an 8-lead, 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 9 = GND). The thermally enhanced layout requires soldering the exposed pad directly to the PCB ground plane for optimal thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (Pin 1) | Positive/Negative Feedback Input | Accepts voltage from output divider; selects 1.204V (noninverting) or 3mV (inverting) reference based on external resistor connection. |
| VC (Pin 2) | Error Amplifier Output | Provides access to compensation node; connect RC network from VC to GND for loop stability. |
| VIN (Pin 3) | Main Power Input | Supplies internal circuitry and switch driver; must be locally bypassed with low-ESR ceramic capacitor. |
| SW (Pin 4) | Switch Collector Node | Connects to collector of internal NPN transistor; minimize trace area to reduce EMI and parasitic inductance. |
| SHDN (Pin 5) | Enable/Shutdown Control | High-gain input with 1.21–1.40V hysteresis; enables UVLO programming and restarts soft-start sequence on rising edge. |
| RT (Pin 6) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency; open or floating disables oscillator. |
| SS (Pin 7) | Soft-Start Capacitor Node | Charged by internal 280kΩ current source; external capacitor controls ramp time and inrush limiting. |
| SYNC (Pin 8) | External Clock Input | Accepts 0.4–1.3V logic-low / >1.3V logic-high clock signal; reverts to internal oscillator when driven below 0.4V. |
| GND (Pin 9, Exposed Pad) | Power and Signal Ground | Thermal and electrical ground; mandatory solder connection to PCB ground plane for thermal reliability and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-Topology Flexibility | Single IC supports boost, SEPIC, and inverting configurations via external component reconnection - reduces BOM count and design validation effort. |
| Programmable UVLO | SHDN pin accepts resistor-divider from VIN to set precise turn-on threshold - eliminates need for external supervisor IC in automotive power sequencing. |
| Thermal Robustness | H-grade rating (–40°C to +150°C) with integrated thermal shutdown and auto-restart - ensures reliable operation in engine-control and infotainment modules. |
| Synchronization Capability | 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. |
| Low-Ripple Inverting Mode | Dual-inductor inverting topology uses L2 in series with output - suppresses abrupt capacitor current changes, yielding lower output ripple than standard buck-boost. |
Applications
| TFT-LCD Bias Supply | GPS Receiver Power |
|---|---|
Use Scenario: Generating ±15V bias rails from a 3.3V or 5V system supply for LCD column/row drivers in automotive instrument clusters. IC Role / Device Role / Timing Role: LT8580HDD#PBF operates in inverting configuration to produce negative rail and boost mode for positive rail - dual-rail generation from single IC. Use Value: Eliminates need for separate inverting and boost controllers; H-grade temperature range ensures stable bias under dashboard thermal cycling. |
Use Scenario: Providing regulated 3.3V or 5V supply to GPS RF front-end and baseband ICs in telematics units exposed to vehicle battery transients. IC Role / Device Role / Timing Role: LT8580HDD#PBF configured as boost converter with wide 2.55–40V input range handles cold-crank (4.5V) and load-dump (40V) events without external protection. Use Value: Integrated 65V switch and UVLO programmability enable direct connection to automotive battery - reduces external TVS and regulator count. |
| DSL Modem Local Supply | VFD Display Bias |
Use Scenario: Generating isolated 12V local supply from 5V USB or PoE-derived rail for DSL line-driver amplifiers requiring clean, low-noise power. IC Role / Device Role / Timing Role: LT8580HDD#PBF used in SEPIC topology to maintain regulation across input variations while providing inherent input-output isolation during shutdown. Use Value: SEPIC's DC-blocking property prevents backfeed into upstream USB/PoE sources during fault conditions - improves system-level safety compliance. |
Use Scenario: Producing high-voltage AC bias (e.g., 20–30VPP) for vacuum fluorescent display segments using charge-pump-like inverting operation. IC Role / Device Role / Timing Role: LT8580HDD#PBF drives coupled inductors in inverting mode to generate high-impedance, low-ripple negative rail - rectified and amplified for VFD grid drive. Use Value: High 1.5MHz max frequency allows small magnetics; 1A switch supports multiplexed segment current without derating at elevated ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EMSE#PBF | 4-switch synchronous buck-boost controller (external MOSFETs); no integrated switch; wider 4–36V input. | Requires external high-side/high-current FETs; supports higher output current (>5A) but needs more board space and gate-drive design. | Select LTC3780EMSE#PBF when >2A output current or >90% efficiency at high load is required; not drop-in for LT8580HDD#PBF due to different topology and pinout. |
| LT3580EDD#PBF | Pin-compatible predecessor with identical pinout and function; rated only to 125°C (E-grade), not AEC-Q100 qualified. | Limited to commercial/industrial ambient; lacks H-grade thermal margin and automotive reliability reporting. | LT3580EDD#PBF may be used in non-automotive designs where cost is prioritized over extended temperature and qualification - verify UVLO and soft-start behavior matches. |
Compared with LTC3780EMSE#PBF and LT3580EDD#PBF, the LT8580HDD#PBF uniquely combines integrated 65V/1A switch, triple-topology flexibility, and AEC-Q100 H-grade qualification in a 3mm × 3mm DFN - making it optimal for space-constrained, thermally demanding automotive and industrial bias supplies where external FETs are undesirable.
Availability
LT8580HDD#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 across automotive and industrial temperature ranges.
Supply support for LT8580HDD#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, Inc. 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 robust DC/DC converters for space- and reliability-critical bias and local power applications - designed specifically for automotive infotainment, instrumentation, and telecom infrastructure where wide input range and topology flexibility are essential.
FAQ
What is the maximum operating junction temperature for the LT8580HDD#PBF?
The LT8580HDD#PBF is rated for continuous operation from –40°C to +150°C junction temperature and is AEC-Q100 qualified for automotive use. Thermal shutdown activates at approximately 165°C, with automatic restart at ~160°C. Derating applies above 125°C per Analog Devices' reliability characterization data - full specification compliance is guaranteed across the entire –40°C to +150°C range.
Can the LT8580HDD#PBF be used in a SEPIC topology, and what are the key layout considerations?
Yes, the LT8580HDD#PBF supports SEPIC configuration as documented in its datasheet Figure 1. Key layout considerations include minimizing SW node loop area to reduce EMI, using tightly coupled inductors (if employed), placing input/output capacitors close to VIN/SW/GND pins, and ensuring the exposed thermal pad (Pin 9) is solidly soldered to a large ground plane for thermal and noise control - critical for stable SEPIC operation at 1.5MHz.
How does the SHDN pin of the LT8580HDD#PBF differ from standard enable inputs?
The SHDN pin of the LT8580HDD#PBF features high-gain comparator circuitry with 40mV hysteresis (1.21V to 1.40V transition), enabling reliable response to slowly varying input signals such as thermistor-based thermal monitors or RC-filtered microcontroller GPIOs. Unlike standard enable pins, it also integrates undervoltage lockout functionality - allowing user-programmable turn-on thresholds via external resistor dividers from VIN.
What is the purpose of the frequency foldback feature in the LT8580HDD#PBF?
Frequency foldback in the LT8580HDD#PBF reduces switching frequency to 1/6 of nominal when FBX voltage falls within 300mV–920mV - typically during startup or overload. This lowers minimum achievable duty cycle, improving switch current control and preventing premature current-limit triggering. It enhances soft-start robustness and enables reliable startup into heavy or shorted loads without external intervention.
Is the LT8580HDD#PBF pin-compatible with other members of the LT8580 family?
Yes, the LT8580HDD#PBF shares identical pinout and footprint with all LT8580 DFN variants (e.g., LT8580EDD#PBF, LT8580IDD#PBF) and is explicitly noted as pin-compatible with the LT3580. Differences are limited to temperature grade (H-grade = –40°C to +150°C), qualification status (AEC-Q100), and minor parameter shifts - allowing direct replacement in existing layouts when upgraded thermal or automotive compliance is needed.
LT8580HDD#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):
- 2.9V
- 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-DFN (3x3)
LT8580HDD#PBF FAQ
1.How can I place an order for LT8580HDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8580HDD#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 LT8580HDD#PBF reliable?
The price and inventory of LT8580HDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8580HDD#PBF is usually 5 days.
3.What payment methods are accepted for LT8580HDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8580HDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8580HDD#PBF?
LT8580HDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8580HDD#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 LT8580HDD#PBF?
For technical support, including LT8580HDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8580HDD#PBF requirements.
6.How does Aetrix verify that LT8580HDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8580HDD#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 LT8580HDD#PBF meets industry standards.
7.What is the process for return or replacement of LT8580HDD#PBF?
All LT8580HDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8580HDD#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 LT8580HDD#PBF part is unused and in its original packaging.
Return procedure for LT8580HDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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