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Analog Devices Inc. LT8582IDKD#TRPBF
- Part No.:
- LT8582IDKD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFDFN Exposed Pad
- Datasheet:
-
LT8582IDKD#TRPBF.pdf
- Description:
- IC REG BST CUK ADJ 3.3A DL 24DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,757
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Product details
Overview
LT8582IDKD#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, 42V-rated PWM DC/DC converter IC with master/slave NPN switch architecture supporting boost, SEPIC, inverting, and flyback topologies. Each channel delivers up to 3A combined output current (1.7A master + 1.3A slave), operates from 2.5V–22V input, and features integrated fault protection including input overvoltage lockout (22.2V min), overtemperature shutdown (>165°C), and output short-circuit detection. It is used in automotive ECU local power supplies generating ±12V from 5V.
For engineers reviewing the LT8582IDKD#TRPBF datasheet, LT8582IDKD#TRPBF pinout, LT8582IDKD#TRPBF application, or LT8582IDKD#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed dual-channel switching specifications, real-world application configurations (e.g., VFD bias, TFT-LCD bias), and two rigorously cross-checked alternative parts with documented functional differences.
Technical Context
The LT8582IDKD#TRPBF implements constant-frequency current-mode control per channel, with independent soft-start, frequency foldback during startup, and sample-mode overcurrent detection triggered when FBX deviates >4% from regulation. Its dual 42V NPN switches support master/slave current sharing (ISWB/ISWA = 0.79 A/A typical) and configurable duty-cycle-dependent current limiting (3A min combined).
Each channel integrates an error amplifier (transconductance 280 μmhos), adjustable oscillator (200 kHz–2.5 MHz via RT pin), power-good comparator (±4% FBX window), and high-gain SHDN input (1.26V–1.31V turn-on threshold with 35 mV hysteresis). The exposed-pad 24-pin DFN package enables thermal management critical for sustained 3A operation at junction temperatures up to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 22V operating; 40V absolute max transient - supports wide automotive and industrial rail inputs without external clamping. |
| Switch Rating | Dual 42V NPN master/slave switches per channel - enables high-voltage boost/SEPIC up to ~40V output and robust inverting operation. |
| Output Current Capability | 3A combined per channel (1.7A master + 1.3A slave) - sufficient for dual-rail ±12V/550mA local supplies from 5V input. |
| Switching Frequency | 200 kHz to 2.5 MHz (adjustable via RT pin or external SYNC) - allows optimization of size vs. efficiency; 1.5 MHz typical in reference designs. |
| VCESAT (Combined) | 270 mV at 2.75A - low conduction loss enables high efficiency (>85% at full load in ±12V/550mA configuration). |
| Fault Protection | Input overvoltage lockout (22.2V min), die overtemperature (>165°C), and output short-circuit detection - autonomous shutdown without external circuitry. |
| Package | 24-pin 7mm × 4mm DFN with exposed thermal pad - requires PCB soldering to GND for θJC = 7°C/W thermal performance. |
Pinout & Package
LT8582IDKD#TRPBF is housed in a 24-lead plastic DFN package (7mm × 4mm) with exposed thermal pad (Pin 25) that must be soldered to the PCB ground plane for thermal integrity and electrical reference. Pin numbering follows standard top-view layout with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SWA1, SWA2 (Pins 1, 12) | Master NPN collector | Handles ≥1.7A peak current; connects to inductor in boost/SEPIC or transformer primary in flyback; minimize trace area for EMI control. |
| SWB1, SWB2 (Pins 24, 13) | Slave NPN collector | Handles ≥1.3A peak current; tied to SWA for combined 3A operation or used independently in charge-pump topologies. |
| FBX1, FBX2 (Pins 6, 7) | Feedback input | Accepts positive (1.204V ref) or negative (7mV ref) feedback voltage; PG assertion requires FBX within ±4% of target. |
| PG1, PG2 (Pins 3, 10) | Open-drain power-good indicator | Active-high signal pulled low if FBX out of regulation by >4%; requires external pull-up resistor for system sequencing. |
| SHDN1, SHDN2 (Pins 22, 15) | Channel enable/disable control | High-impedance input with 1.26V–1.31V activation threshold and 35mV hysteresis; accepts slow-ramping signals without glitching. |
| GATE1, GATE2 (Pins 4, 9) | PMOS gate drive output | Current-source pull-down (up to 1mA) for external PMOS disconnect; current scales linearly with SS voltage above 550mV. |
| SS1, SS2 (Pins 20, 17) | Soft-start capacitor connection | Charged by internal 250kΩ resistor to ~2.1V; controls ramp rate of switch current limit and GATE pull-down current. |
| RT1, RT2 (Pins 21, 16) | Oscillator timing resistor | Resistor-to-ground sets free-running frequency (200kHz–2.5MHz); 31.6kΩ yields ~2.5MHz, 407kΩ yields ~200kHz. |
| VIN1, VIN2 (Pins 2, 11) | Input supply | Must be locally bypassed with low-ESR ceramic capacitor; supports shared or independent input rails per channel. |
| CLKOUT1, CLKOUT2 (Pins 23, 14) | Channel synchronization output | CH1: 50% duty cycle, 180° out-of-phase; CH2: duty cycle varies with junction temperature - usable as on-die thermal monitor. |
| GND (Pin 25) | Power and signal ground | Exposed thermal pad; must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost/inverting/SEPIC/flyback channels | Enables compact dual-rail generation (e.g., +12V and –12V) from single 5V input without external controllers or complex sequencing. |
| Integrated fault protection with automatic recovery | Self-contained response to input overvoltage, overtemperature, and output shorts - disables switches, asserts PG low, and initiates SS-based timeout/retry sequence. |
| Adjustable undervoltage lockout via SHDN pin | Configurable VINUVLO using external resistor divider (e.g., 1.31V threshold referenced to SHDN) - eliminates need for discrete UVLO ICs. |
| Master/slave current sharing with combined 3A limit | Guaranteed ISWB/ISWA ratio of 0.79 A/A enables predictable current division when SWA/SWB are tied - simplifies high-current design without current-sense resistors. |
| High-gain SHDN with slow-signal tolerance | Accepts analog control signals (e.g., microcontroller DAC output) directly - no external Schmitt trigger required for clean enable/disable transitions. |
| Thermal-aware CLKOUT2 output | CH2 clock duty cycle varies linearly with junction temperature - provides real-time die temperature monitoring without external sensor or ADC. |
Applications
| Vacuum Fluorescent Display (VFD) Bias Supply | TFT-LCD Panel Bias Supply |
|---|---|
Use Scenario: Generating +30V and –30V bias rails for VFD segment/grid drivers in automotive instrument clusters. IC Role / Device Role / Timing Role: Dual-channel inverting/boost converter delivering regulated high-voltage rails with independent soft-start and fault isolation per rail. Use Value: Eliminates need for separate DC/DC controllers and external overvoltage protection; 42V switch rating supports >35V outputs without cascading stages. |
Use Scenario: Providing AVDD (+15V), VGH (+25V), and VGL (–10V) for TFT-LCD source/gate drivers in industrial HMIs. IC Role / Device Role / Timing Role: Configured as three independent converters (two boost, one inverting) using both channels and external charge pumps. Use Value: Reduces BOM count by consolidating multiple bias rails into single IC; integrated PG pins simplify power sequencing across display subsystems. |
| Automotive Engine Control Unit (ECU) Local Power | Industrial Programmable Logic Controller (PLC) I/O Module |
Use Scenario: Deriving isolated ±12V analog sensor supplies and 5V logic rail from vehicle battery (9V–16V) in ECU mainboard. IC Role / Device Role / Timing Role: Dual-channel SEPIC converter for input-transient tolerant operation; synchronized switching minimizes EMI in safety-critical zones. Use Value: Withstands 40V load-dump transients without damage; built-in OVP prevents downstream component failure during alternator regulation faults. |
Use Scenario: Powering isolated analog input channels (±10V range) and digital I/O buffers in modular PLC backplanes with 24V DC input. IC Role / Device Role / Timing Role: Boost converter generating +15V for op-amps and inverting converter generating –15V for precision ADC references. Use Value: Combined 3A output supports up to 8 analog channels with headroom for surge currents; GATE-driven PMOS enables hot-swap capability during field maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EFE#PBF | Single-channel synchronous buck controller (no inverting/SEPIC support); requires external MOSFETs and feedback compensation. | Suitable only for step-down conversion; cannot replace LT8582IDKD#TRPBF in ±12V or VFD bias applications without redesign. | Select only if step-down-only operation and higher efficiency (>95%) at >12V input are required; adds complexity for dual-rail generation. |
| MAX20406AATG+T | Dual-channel buck converter (no boost/inverting capability); fixed 3.3V/5V outputs; no programmable frequency or external sync. | Limited to fixed low-voltage rails; lacks fault protection granularity (no per-channel PG or OVP) and cannot generate negative voltages. | Appropriate only for cost-sensitive, low-complexity digital rail generation where ± outputs and fault autonomy are unnecessary. |
Compared with LTC3891EFE#PBF and MAX20406AATG+T, the LT8582IDKD#TRPBF uniquely integrates dual independent switch-mode topologies (boost/SEPIC/inverting/flyback), per-channel fault protection with autonomous recovery, and master/slave current sharing - making it irreplaceable in applications requiring compact, self-protected dual-polarity bias supplies.
Availability
LT8582IDKD#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power, TFT-LCD bias supplies, vacuum fluorescent display (VFD) drivers, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LT8582IDKD#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, Inc. (ADI) acquired Linear Technology in 2017 and maintains its legacy of high-performance analog and power management ICs with rigorous automotive-grade qualification and long-term product longevity commitments.
The LT8582IDKD#TRPBF belongs to ADI's high-voltage dual-channel DC/DC converter family, designed specifically for space-constrained, fault-tolerant local power systems in automotive, industrial, and display electronics where reliability under transient stress is critical.
FAQ
What is the maximum input voltage the LT8582IDKD#TRPBF can withstand without damage?
The LT8582IDKD#TRPBF has an absolute maximum VIN rating of 40V, but its internal overvoltage lockout triggers at 22.2V (minimum) to protect downstream circuitry. Operation above 22V is not recommended for continuous use; transient spikes up to 40V are tolerated for short durations per Absolute Maximum Ratings. Always verify layout and input filtering meet automotive load-dump standards when using LT8582IDKD#TRPBF in vehicle systems.
Can the LT8582IDKD#TRPBF generate negative output voltages, and how is feedback configured?
Yes, the LT8582IDKD#TRPBF supports inverting topology per channel. For negative outputs, connect FBX pin to the negative rail through a resistor calculated as RFBX = (|VOUT| + 7 mV) / 83.3 µA. The internal reference for inverting mode is 7 mV (not 1.204 V), and PG assertion requires FBX voltage to fall below 65 mV. This configuration is validated in the LT8582IDKD#TRPBF datasheet Figure TA01a for –12V generation.
How does the LT8582IDKD#TRPBF handle output short-circuit conditions?
During an output short, the LT8582IDKD#TRPBF enters sample mode, monitors inductor current every cycle, and triggers a fault if master switch current exceeds 2 A (min) or combined SWA+SWB current exceeds 3.5 A (min). It then disables switches, pulls PG low, and initiates a timeout sequence where the SS pin charges to ~2.1 V and discharges to 55 mV before retry - protecting external components and enabling autonomous recovery without host intervention.
Is the LT8582IDKD#TRPBF pin-compatible with other members of the LT8582 family?
Yes, all LT8582 variants (e.g., LT8582EDKD#TRPBF, LT8582IDKD#PBF) share identical pinout, package, and electrical interface. The 'I' grade (LT8582IDKD#TRPBF) is rated for –40°C to 125°C operation, while the 'E' grade is specified from 0°C to 125°C. Functionally identical, the only difference is temperature qualification - allowing direct substitution in thermally demanding environments without layout changes.
What is the purpose of the CLKOUT2 pin on the LT8582IDKD#TRPBF, and how is it used?
The CLKOUT2 pin on the LT8582IDKD#TRPBF outputs a clock signal in phase with the internal oscillator whose duty cycle varies linearly with junction temperature (e.g., 22.5% at –40°C, 42% at 25°C, 72% at 125°C). This enables real-time die temperature monitoring without external sensors - useful for thermal derating or predictive maintenance in industrial applications using LT8582IDKD#TRPBF.
LT8582IDKD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-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, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 22V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 42V (Switch)
- Current - Output:
- 3.3A (Switch)
- Frequency - Switching:
- 200kHz ~ 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-DFN (7x4)
LT8582IDKD#TRPBF FAQ
1.How can I place an order for LT8582IDKD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8582IDKD#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 LT8582IDKD#TRPBF reliable?
The price and inventory of LT8582IDKD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8582IDKD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8582IDKD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8582IDKD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8582IDKD#TRPBF?
LT8582IDKD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8582IDKD#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 LT8582IDKD#TRPBF?
For technical support, including LT8582IDKD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8582IDKD#TRPBF requirements.
6.How does Aetrix verify that LT8582IDKD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8582IDKD#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 LT8582IDKD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8582IDKD#TRPBF?
All LT8582IDKD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8582IDKD#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 LT8582IDKD#TRPBF part is unused and in its original packaging.
Return procedure for LT8582IDKD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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