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Analog Devices Inc. LT8302HS8E#WTRPBF
- Part No.:
- LT8302HS8E#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302HS8E#WTRPBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,214
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Product details
Overview
LT8302HS8E#WTRPBF from Analog Devices is a monolithic micropower isolated flyback controller IC with integrated 65V/3.6A DMOS power switch, operating from 3V to 42V input and delivering up to 18W isolated output power. It regulates output voltage without opto-isolator or third transformer winding using primary-side flyback waveform sampling, supports boundary mode for heavy loads and low-ripple Burst Mode® for light loads, and targets automotive auxiliary power supplies.
For engineers reviewing the LT8302HS8E#WTRPBF datasheet, LT8302HS8E#WTRPBF pinout, LT8302HS8E#WTRPBF application, or LT8302HS8E#WTRPBF equivalent, key selection considerations include its AEC-Q100 qualification, –40°C to 150°C junction temperature rating, 106µA sleep-mode quiescent current, 3.6A switch current limit, and thermally enhanced 8-lead SO package with exposed GND pad.
Technical Context
The LT8302HS8E#WTRPBF implements quasi-resonant boundary conduction mode at heavy load-sensing zero secondary current via SW pin valley detection-to achieve excellent load regulation and enable compact magnetics. Its sample-and-hold error amplifier directly measures isolated output voltage from the primary-side flyback pulse, eliminating need for optocouplers or auxiliary windings.
At light loads, it transitions to low-ripple Burst Mode® operation with 12kHz minimum switching frequency, maintaining high efficiency while limiting output voltage ripple. Internal compensation, soft-start, EN/UVLO with 1.214V threshold and 14mV hysteresis, and temperature-compensated feedback (via TC pin) are fully integrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide automotive battery range including cold-crank and load-dump conditions. |
| Switch Rating | 65V/3.6A DMOS - enables robust 18W isolated output with margin for leakage inductance spikes. |
| Quiescent Current | 106µA in Sleep Mode - minimizes standby power loss in always-on automotive systems. |
| Operating Temp | –40°C to 150°C junction - AEC-Q100 qualified for under-hood automotive applications. |
| Regulation Method | Primary-side flyback sampling - eliminates opto-isolator and third winding, reducing BOM count and cost. |
| Control Modes | Boundary mode (heavy load), Discontinuous mode (mid-load), Low-ripple Burst Mode® (light load) - balances efficiency, EMI, and regulation across full load range. |
| Feedback Reference | 1.00V ±2% RREF voltage - enables precise output programming with external resistor divider. |
| Package | 8-Lead Plastic SO with exposed GND pad - θJA = 33°C/W; requires soldering exposed pad for thermal and electrical integrity. |
Pinout & Package
LT8302HS8E#WTRPBF is housed in a thermally enhanced 8-lead plastic SO package (S8E) with exposed GND pad (Pin 9), which must be soldered to PCB ground plane for thermal management and electrical reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input Undervoltage Lockout Input | Accurate 1.214V enable threshold with 14mV hysteresis; used to program VIN UVLO or shut down device below 0.3V. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal circuitry; must be bypassed with ≥1µF ceramic capacitor to GND; no external supply allowed. |
| VIN (Pin 3) | Main Input Supply | Supplies control logic and serves as reference for RFB feedback network; requires local bulk capacitance. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power & Signal Ground | Common return for all internal circuits; exposed pad is electrically and thermally connected to GND - mandatory soldering required. |
| SW (Pin 5) | Drain of Integrated DMOS Switch | Connects to transformer primary; high dv/dt node - minimize trace area to reduce EMI and voltage overshoot. |
| RFB (Pin 6) | Feedback Resistor Input | Connects to transformer primary SW node; forms voltage divider with RREF to set output voltage via sampled flyback pulse. |
| RREF (Pin 7) | Reference Resistor Input | Ground-referenced node for RREF resistor; internal 1.00V reference ensures accurate output programming. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (3.35mV/°K) used to offset output diode forward voltage drift; connects to RREF via RTC resistor. |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces component count, cost, and board space while eliminating opto aging and nonlinearity issues. |
| AEC-Q100 qualified (H grade) | Validated for automotive under-hood use with guaranteed operation from –40°C to 150°C junction temperature. |
| Low-ripple Burst Mode® | Maintains <1% output voltage ripple at light loads while achieving >80% efficiency down to 0.5% full-load. |
| Integrated soft-start and compensation | Eliminates external compensation components and simplifies design-in; 11ms internal soft-start prevents inrush current. |
| Output short-circuit protection | Robust fault handling without external circuitry; automatically recovers after fault removal. |
| Temperature-compensated feedback | TC pin enables precise compensation of output diode VF drift, critical for stable 3.3V/5V outputs over temperature. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Housekeeping |
|---|---|
Use Scenario: Providing isolated 5V/12V bias for CAN transceivers, sensors, and microcontrollers in engine control units (ECUs) and ADAS modules. IC Role / Device Role / Timing Role: Primary-side isolated flyback controller regulating output without optocoupler, enabling compact, high-reliability power architecture. Use Value: Eliminates opto aging and improves long-term stability; AEC-Q100 H-grade rating ensures operation at 150°C junction temperature under hood. | Use Scenario: Generating isolated 3.3V/5V for PLC I/O modules, industrial gateways, and safety-rated controllers requiring reinforced isolation. IC Role / Device Role / Timing Role: Micropower flyback controller delivering up to 18W with boundary mode for tight load regulation and low-ripple Burst Mode® for low-power sleep states. Use Value: 106µA sleep current extends battery backup time; integrated UVLO and short-circuit protection simplify system-level safety compliance. |
| Medical Isolated Sensors | Telecom Remote Power |
Use Scenario: Powering isolated analog front-ends and ADCs in patient monitoring equipment where creepage/clearance and low EMI are critical. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller enabling reinforced isolation barrier without opto latency or gain drift. Use Value: Boundary mode operation minimizes transformer size and audible noise; low-ripple Burst Mode® avoids interference with sensitive analog measurements. | Use Scenario: Delivering isolated 5V/12V to remote PHY devices, PoE splitters, or fiber interface cards in telecom infrastructure cabinets. IC Role / Device Role / Timing Role: High-efficiency flyback controller supporting wide 3V–42V input range to accommodate varying backplane voltages and brownout conditions. Use Value: 3.6A/65V integrated switch handles peak loads without external FET; thermally enhanced SO package sustains continuous operation in confined spaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8304HS8E#WTRPBF | Higher 100V/5A switch rating; supports up to 30W output; identical pinout and feature set. | Better suited for higher-output or higher-input-voltage designs (e.g., 48V telecom); same AEC-Q100 H-grade temp range. | Select when >18W output or >42V transient tolerance is required; drop-in replacement with no layout change. |
| UCC28740DR | TI's PSR flyback controller with 700V MOSFET; no integrated switch; requires external HV FET; different pinout and feedback scheme. | Targets universal AC input (85–265VAC); not automotive-qualified; lacks TC pin and AEC-Q100 support. | Choose only for AC/DC offline applications; not suitable for automotive or low-noise DC/DC isolated designs. |
Compared with LT8304HS8E#WTRPBF, the LT8302HS8E#WTRPBF offers lower cost and smaller solution size for ≤18W automotive auxiliary rails, while UCC28740DR requires external HV FET and redesign for DC input, making it unsuitable as a direct functional substitute in this context.
Availability
LT8302HS8E#WTRPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial isolated housekeeping, and medical sensor biasing requiring stable component supply with AEC-Q100 compliance and extended temperature support.
Supply support for LT8302HS8E#WTRPBF 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, power, and RF applications across industrial, automotive, and communications markets.
The LT8302 product line delivers micropower primary-side regulated isolated flyback controllers optimized for automotive and industrial applications demanding high reliability, small footprint, and no-opto simplicity.
FAQ
What is the maximum output power achievable with LT8302HS8E#WTRPBF?
The LT8302HS8E#WTRPBF delivers up to 18W of isolated output power, validated across 3V–42V input range with appropriate transformer design and layout. This assumes operation within absolute maximum ratings-including 65V SW pin stress margin-and accounts for thermal limits in the –40°C to 150°C junction temperature range. Actual output depends on transformer turns ratio, output voltage, and cooling capability.
Does LT8302HS8E#WTRPBF require an optocoupler or third transformer winding?
No, the LT8302HS8E#WTRPBF does not require an optocoupler or third transformer winding. It samples the isolated output voltage directly from the primary-side flyback waveform at the SW pin, enabling regulation through primary-side sensing. This architecture reduces component count, improves long-term reliability, and eliminates opto-related aging and nonlinearity issues.
What is the purpose of the TC pin on LT8302HS8E#WTRPBF?
The TC pin on LT8302HS8E#WTRPBF provides a proportional-to-absolute-temperature (PTAT) voltage (3.35mV/°K) used to compensate for the negative temperature coefficient of the output diode's forward voltage. By connecting an RTC resistor between TC and RREF pins, the LT8302HS8E#WTRPBF actively corrects output voltage drift-critical for stable 3.3V or 5V rails across automotive temperature ranges.
Is LT8302HS8E#WTRPBF AEC-Q100 qualified?
Yes, the LT8302HS8E#WTRPBF is AEC-Q100 qualified (Grade H), with guaranteed operation from –40°C to 150°C junction temperature. It is specifically designed for automotive applications including engine control, ADAS, and infotainment systems requiring high reliability under harsh thermal and electrical conditions.
How does LT8302HS8E#WTRPBF manage light-load efficiency?
The LT8302HS8E#WTRPBF uses low-ripple Burst Mode® operation at light loads, alternating between active and sleep modes to reduce effective quiescent current to 106µA. It maintains a minimum 12kHz switching frequency to ensure accurate output voltage sampling while minimizing output ripple-achieving >80% efficiency even below 1% of full load.
LT8302HS8E#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Flyback
- Output Type:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- 65V (Switch)
- Current - Output:
- 3.6A (Switch)
- Frequency - Switching:
- Down to 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8302HS8E#WTRPBF FAQ
1.How can I place an order for LT8302HS8E#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302HS8E#WTRPBF 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 LT8302HS8E#WTRPBF reliable?
The price and inventory of LT8302HS8E#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8302HS8E#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT8302HS8E#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302HS8E#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302HS8E#WTRPBF?
LT8302HS8E#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302HS8E#WTRPBF 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 LT8302HS8E#WTRPBF?
For technical support, including LT8302HS8E#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302HS8E#WTRPBF requirements.
6.How does Aetrix verify that LT8302HS8E#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT8302HS8E#WTRPBF 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 LT8302HS8E#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT8302HS8E#WTRPBF?
All LT8302HS8E#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302HS8E#WTRPBF, 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 LT8302HS8E#WTRPBF part is unused and in its original packaging.
Return procedure for LT8302HS8E#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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