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Analog Devices Inc. LT8580HDD#TRPBF
- Part No.:
- LT8580HDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8580HDD#TRPBF.pdf
- Description:
- IC REG BOOST CUK ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,067
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Product details
Overview
LT8580HDD#TRPBF from Analog Devices is a high-voltage 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 output current, supports 200kHz–1.5MHz switching frequency, and features soft-start, synchronization, and adjustable UVLO - used in TFT-LCD bias supplies and GPS receivers.
For engineers reviewing the LT8580HDD#TRPBF datasheet, LT8580HDD#TRPBF pinout, LT8580HDD#TRPBF application, or LT8580HDD#TRPBF equivalent, key selection criteria include its 150°C guaranteed junction temperature rating, 400mV typical VCE(SAT) at 0.75A, single-resistor VOUT programming, and thermally enhanced 3mm × 3mm DFN package with exposed GND pad.
Technical Context
The LT8580HDD#TRPBF 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 above 50%. Its dual-amplifier FBX architecture enables seamless reconfiguration between noninverting (boost/SEPIC) and inverting topologies via external resistor connection.
It integrates frequency foldback during soft-start (reducing fSW to ~1/6 nominal), a high-gain SHDN pin accepting slowly ramping enable signals, and thermal shutdown activation at ~165°C with automatic restart at ~160°C. The VC pin provides direct access to the error amplifier output for custom loop compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.55V to 40V - supports wide-input industrial and automotive supply rails without pre-regulation. |
| Switch Rating | 1A, 65V NPN - enables high-step-up ratios and robust operation in SEPIC/inverting configurations with VIN spanning VOUT. |
| VCE(SAT) | 400mV at 0.75A (typical) - minimizes conduction loss and thermal stress at full load. |
| Switching Frequency | 200kHz to 1.5MHz - adjustable via RT resistor or external SYNC clock; higher frequencies allow smaller magnetics. |
| Feedback Reference | +1.204V (noninverting) or –3mV (inverting) - enables precise VOUT setting with single RFBX and eliminates need for divider networks. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Quiescent Current | 1.2–1.7mA active; ≤1µA shutdown - extends battery life in always-on GPS or remote sensor applications. |
Pinout & Package
LT8580HDD#TRPBF is housed in a thermally enhanced 8-lead 3mm × 3mm plastic DFN package (DD) with exposed GND pad (Pin 9), requiring soldering to PCB for thermal and electrical integrity. θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Positive/Negative Feedback Input | Accepts either +1.204V reference (boost/SEPIC) or –3mV reference (inverting); sets VOUT with single resistor. |
| VC (2) | Error Amplifier Output | Provides direct access to compensation node; requires RC network to GND for loop stability. |
| VIN (3) | Main Power Input | Supplies internal circuitry and switch driver; must be locally bypassed with low-ESR ceramic capacitor. |
| SW (4) | Switch Collector Node | Connects to external inductor/diode; high di/dt node - minimize trace area to reduce EMI. |
| SHDN (5) | Enable/Shutdown Control | High-gain input with 40mV hysteresis; 1.21–1.40V transition window enables programmable UVLO with resistor divider. |
| RT (6) | Oscillator Timing Input | Resistor-to-GND sets free-running frequency; open-drain SYNC overrides when driven below 0.4V. |
| SS (7) | Soft-Start Capacitor Node | Internal 280k pull-up charges external cap to ~2.1V; controls inrush current and prevents output overshoot. |
| SYNC (8) | External Clock Input | Accepts 0.4–1.3V logic levels; synchronizes switching to system clock to eliminate beat frequencies. |
| GND (9) | Power & Signal Ground | Exposed thermal pad - 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 converters - reduces BOM count and design cycle time for multi-rail systems. |
| Thermal Robustness | Guaranteed operation to +150°C junction temperature with thermal shutdown and auto-restart - suitable for engine-control and infotainment modules. |
| Startup Control | Integrated soft-start + frequency foldback + precise SHDN threshold - eliminates output voltage overshoot and inrush stress on capacitors and loads. |
| Low-Noise Enable | High-gain SHDN pin accepts slow-ramping inputs (e.g., microcontroller GPIO) without false triggering - simplifies power sequencing. |
| UVLO Programmability | User-configurable undervoltage lockout via SHDN pin resistor divider - ensures reliable start-up across varying battery conditions. |
Applications
| VFD Bias Supplies | TFT-LCD Bias Supplies |
|---|---|
Use Scenario: Generating stable ±15V to ±30V rails for vacuum fluorescent display segment drivers in automotive instrument clusters. IC Role / Device Role / Timing Role: LT8580HDD#TRPBF operates in inverting configuration to produce negative bias rail; synchronized to system clock to suppress EMI in sensitive analog front-ends. Use Value: Single-chip solution replaces discrete charge-pump + LDO stacks; 400mV VCE(SAT) maintains regulation under cold-crank (6V VIN) while meeting AEC-Q100 temp requirements. | Use Scenario: Providing high-precision positive and negative gate drive voltages (VON, VOFF) for active-matrix LCD panels in medical imaging displays. IC Role / Device Role / Timing Role: LT8580HDD#TRPBF configured as SEPIC to maintain regulated output even when input drops to 8V during brownout events. Use Value: Adjustable UVLO prevents erratic panel behavior during power-up; 1.2A switch handles peak backlight transients without dropout. |
| GPS Receivers | DSL Modems |
Use Scenario: Supplying clean 3.3V LNA and 2.8V RF synthesizer rails from a 5V USB-powered baseband processor. IC Role / Device Role / Timing Role: LT8580HDD#TRPBF used in boost mode with external SYNC to align switching edges away from GPS L1 band (1.575GHz) harmonics. Use Value: Low 1.7mA quiescent current extends battery runtime; 200kHz–1.5MHz range allows optimal EMI filtering without compromising efficiency. | Use Scenario: Generating isolated ±12V line-driver supplies in xDSL CPE equipment operating from 12V wall adapter. IC Role / Device Role / Timing Role: LT8580HDD#TRPBF configured as inverting converter to derive negative rail; RT resistor sets 600kHz fSW for compact filter design. Use Value: Pin-compatible with LT3580 - enables drop-in upgrade path for legacy designs needing higher temperature capability and lower VCE(SAT). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3580EDD#TRPBF | Same pinout, identical topology support, but rated only to 125°C junction; higher 500mV VCE(SAT) at 0.75A. | Limited to commercial/industrial ambient; unsuitable for under-hood automotive use. | Select when cost sensitivity outweighs temperature or efficiency requirements. |
| LT8330EMSE#TRPBF | Wider 3V–40V input, 1.5A switch, but fixed 2.2MHz fSW; no inverting topology support; different pinout. | Better for ultra-compact boost-only designs; incompatible for SEPIC/inverting or SYNC-dependent systems. | Choose for space-constrained boost applications where 2.2MHz enables <1µH inductors and eliminates EMI-sensitive bands. |
Compared with LT3580EDD#TRPBF, LT8580HDD#TRPBF delivers 20% lower conduction loss and 25°C higher thermal margin; versus LT8330EMSE#TRPBF, it offers topology flexibility and synchronization at the cost of fixed-frequency simplicity and smaller footprint.
Availability
LT8580HDD#TRPBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver power rails, and DSL modem line drivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8580HDD#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8580 product line delivers high-voltage, multi-topology DC/DC controllers for demanding power conversion tasks in space-constrained, high-temperature environments - designed specifically for automotive display, navigation, and telecom infrastructure applications.
FAQ
What is the maximum guaranteed junction temperature for LT8580HDD#TRPBF?
The LT8580HDD#TRPBF is guaranteed to operate over a junction temperature range of –40°C to +150°C, with thermal shutdown activating at approximately 165°C and automatic restart occurring at ~160°C. This H-grade qualification makes LT8580HDD#TRPBF suitable for under-hood automotive applications and high-ambient industrial environments where standard E- or I-grade variants would fail.
Can LT8580HDD#TRPBF be used in an inverting configuration, and how is the feedback set?
Yes, LT8580HDD#TRPBF supports inverting topology by connecting RFBX from VOUT to the FBX pin to pull it to –3mV (typical). The internal amplifier A2 then performs noninverting amplification from FBX to VC, enabling stable negative output regulation. RFBX is calculated as (|VOUT| + 3mV) / 83.3µA - eliminating the need for level-shifting circuitry or external op-amps in LT8580HDD#TRPBF designs.
How does the SHDN pin of LT8580HDD#TRPBF differ from standard enable inputs?
The SHDN pin of LT8580HDD#TRPBF features high-gain input circuitry with 40mV hysteresis and a precise 1.21V–1.40V activation window, allowing it to accept slowly varying signals (e.g., RC-ramped microcontroller outputs) without chatter. Unlike conventional enable pins, LT8580HDD#TRPBF's SHDN also interfaces directly with the UVLO comparator - enabling user-programmable undervoltage lockout using a simple resistor divider from VIN.
What is the purpose of frequency foldback in LT8580HDD#TRPBF, and when is it active?
Frequency foldback in LT8580HDD#TRPBF reduces switching frequency to ~1/6 of nominal during soft-start when the FBX pin voltage resides between 300mV and 920mV. This lowers minimum achievable duty cycle, improving switch current control and preventing output overshoot during startup. Foldback deactivates automatically once FBX exits that range - ensuring normal operation under steady-state regulation.
Is LT8580HDD#TRPBF pin-compatible with any other Analog Devices parts?
Yes, LT8580HDD#TRPBF is pin-compatible with the LT3580 series (e.g., LT3580EDD#TRPBF), sharing identical 8-lead DFN pinout, FBX/VC/SW/SHDN functionality, and topology configuration methods. This allows direct replacement in existing LT3580 layouts while upgrading to higher temperature rating (+150°C vs. +125°C), lower VCE(SAT) (400mV vs. 500mV), and improved startup behavior - without PCB redesign.
LT8580HDD#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):
- 2.9V
- 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#TRPBF FAQ
1.How can I place an order for LT8580HDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8580HDD#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 LT8580HDD#TRPBF reliable?
The price and inventory of LT8580HDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8580HDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8580HDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8580HDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8580HDD#TRPBF?
LT8580HDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8580HDD#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 LT8580HDD#TRPBF?
For technical support, including LT8580HDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8580HDD#TRPBF requirements.
6.How does Aetrix verify that LT8580HDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8580HDD#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 LT8580HDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8580HDD#TRPBF?
All LT8580HDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8580HDD#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 LT8580HDD#TRPBF part is unused and in its original packaging.
Return procedure for LT8580HDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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