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Analog Devices Inc. LT8302IS8E-3#PBF
- Part No.:
- LT8302IS8E-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302IS8E-3#PBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:160
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Product details
Overview
LT8302IS8E-3#PBF from Analog Devices is a monolithic micropower isolated flyback converter IC with integrated 65V/3.6A DMOS 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 in boundary mode, enabling compact auxiliary power supplies for automotive and industrial systems.
For engineers reviewing the LT8302IS8E-3#PBF datasheet, LT8302IS8E-3#PBF pinout, LT8302IS8E-3#PBF application, or LT8302IS8E-3#PBF equivalent, key selection considerations include its 106µA sleep-mode quiescent current, ±1.0% RREF reference accuracy, AEC-Q100 qualification (I-grade), thermally enhanced 8-lead SO package with exposed GND pad, and low-ripple Burst Mode® operation down to 0.5% full-load minimum load.
Technical Context
The LT8302IS8E-3#PBF implements quasi-resonant boundary conduction mode at heavy loads-sensing zero secondary current via SW pin valley detection-to achieve excellent load regulation and small magnetics. Its unique RREF-pin voltage-based boundary detection (vs. dv/dt sensing in LT8302) reduces noise sensitivity in multi-output designs.
At light loads, it transitions to low-ripple Burst Mode® with 12kHz minimum switching frequency, maintaining high efficiency while preserving accurate output sampling. Internal 3V LDO (INTVCC), soft-start timer (11ms), and temperature-compensated feedback (via TC pin, 3.35mV/K PTAT) are fully integrated, eliminating external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-input industrial and automotive battery rails without pre-regulation. |
| Switch Rating | 65V/3.6A DMOS - enables 18W isolated output with margin for leakage spikes in flyback topologies. |
| Quiescent Current | 106µA sleep mode - extends battery life in always-on auxiliary power applications. |
| RREF Reference | 1.00V ±2% - sets output voltage accuracy independent of temperature when used with RFB/RREF divider. |
| Operating Temp | –40°C to +125°C junction - qualified per AEC-Q100 Grade I for under-hood automotive use. |
| Package | 8-Lead Plastic SO with exposed GND pad - θJA = 33°C/W thermal resistance enables high-power density without heatsink. |
| Minimum Load | <0.5% of full output - eliminates need for dummy loads in low-power standby modes. |
Pinout & Package
LT8302IS8E-3#PBF is housed in an 8-lead plastic SO package (S8E) with exposed GND pad (Pin 9), requiring soldering to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input UVLO Input | Accurate 1.214V enable threshold with 14mV hysteresis; programs VIN undervoltage lockout via resistor divider. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal circuitry; must be bypassed with ≥1µF ceramic capacitor to GND; no external drive 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 circuits; exposed pad is electrically and thermally connected to GND-must be soldered. |
| 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 Current Input | Converts flyback pulse amplitude into current; ratio with RREF sets output voltage (VOUT = VREF × RFB/RREF × 1/NPS – VF). |
| RREF (Pin 7) | Reference Resistor Terminal | Ground-referred node for RREF; internal 1.00V reference ensures stable feedback; accepts 9.09k–11.0kΩ for optimal accuracy. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1.00V @ 25°C, +3.35mV/K) used to offset diode VF drift; connects to RREF via RTC for 5V/3.3V output stabilization. |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces BOM count, cost, and board space while eliminating opto aging, nonlinearity, and slow response issues. |
| Low-ripple Burst Mode® operation | Maintains <15mVpp output ripple at light loads while achieving >80% efficiency at 10mA output current. |
| Boundary mode with valley switching | Enables zero-current switching for high efficiency and minimal transformer size-no subharmonic oscillation risk. |
| Integrated soft-start and compensation | 11ms internal soft-start prevents inrush; eliminates external compensation network for simplified layout and faster design cycle. |
| AEC-Q100 Grade I qualification | Validated for automotive environments including engine control units, infotainment, and ADAS auxiliary supplies. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Housekeeping |
|---|---|
Use Scenario: Providing isolated 5V/1A supply for CAN transceiver, sensor interface, and microcontroller in vehicle body control modules. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller generating isolated DC output without optocoupler feedback path. Use Value: Eliminates opto aging and unit-to-unit variation, ensuring long-term stability over 15-year automotive lifecycle. | Use Scenario: Generating isolated 3.3V/500mA bias for PLC I/O isolation barriers and fieldbus interface ICs in factory automation. IC Role / Device Role / Timing Role: Micropower flyback controller delivering stable auxiliary rail across 9–36V DC input range with <0.5% minimum load requirement. Use Value: Enables true zero-load operation during system sleep states, reducing standby power by >50% vs. traditional flyback solutions. |
| Medical Sensor Isolation | Telecom Remote Power |
Use Scenario: Isolated 5V supply for patient-connected biosensor front-ends requiring reinforced insulation and low leakage current. IC Role / Device Role / Timing Role: Safety-certified flyback controller meeting IEC 60601 creepage/clearance requirements via transformer-only isolation. Use Value: Removes opto-isolator failure mode, improving MTBF and simplifying safety certification documentation. | Use Scenario: Compact 12V isolated output for remote radio units powered from 48V telecom plant with strict EMI limits. IC Role / Device Role / Timing Role: Boundary-mode flyback controller minimizing transformer size and conducted emissions through valley-switching operation. Use Value: Achieves CISPR-32 Class B compliance with single-layer PCB layout due to low EMI switching profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8301IS8E#PBF | Lower 36V switch rating (vs. 65V); no TC pin; 2.5A switch (vs. 3.6A); same 8-lead SO package. | Rated for ≤12W output; unsuitable for 24V-input/5V-output designs requiring >1A load. | Select LT8301IS8E#PBF only for lower-power, cost-sensitive applications where 65V switch margin is unnecessary. |
| UCC28740DR | TI part with 700V MOSFET; higher VDS rating but larger SOIC-7 package; no integrated TC compensation; different control architecture (valley switching + CCM/DCM hybrid). | Better suited for universal AC-input offline flyback; not AEC-Q100 qualified; lacks automotive temp grade and low-IQ sleep mode. | Choose UCC28740DR for AC/DC adapter designs; avoid for automotive or battery-powered isolated DC/DC where LT8302IS8E-3#PBF's 106µA IQ and AEC-Q100 are critical. |
Compared with LT8301IS8E#PBF and UCC28740DR, the LT8302IS8E-3#PBF uniquely combines AEC-Q100 Grade I qualification, 65V/3.6A switch, TC-based diode compensation, and 106µA sleep current in a thermally optimized 8-lead SO-making it the only choice for high-reliability, wide-input, low-quiescent isolated DC/DC in automotive and medical edge devices.
Availability
LT8302IS8E-3#PBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial PLC housekeeping supplies, and medical sensor isolation requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8302IS8E-3#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 markets.
The LT8302/LT8302-3 product line delivers micropower isolated flyback controllers optimized for compact, reliable, and opto-free auxiliary power in harsh environments-including engine compartments and factory floors.
FAQ
What is the maximum output power achievable with LT8302IS8E-3#PBF?
The LT8302IS8E-3#PBF delivers up to 18W of isolated output power, validated across 3V–42V input range. At 24V input, typical 5V/2.9A output is achievable with appropriate transformer turns ratio and layout; peak power depends on thermal management, transformer quality, and PCB copper area for the exposed GND pad.
Does LT8302IS8E-3#PBF require an external opto-isolator for regulation?
No. The LT8302IS8E-3#PBF uses primary-side flyback waveform sampling to regulate output voltage without opto-isolator or third transformer winding. This eliminates opto aging, nonlinearity, and dynamic response limitations-confirmed in the device's block diagram and operation section.
How does the TC pin function in LT8302IS8E-3#PBF?
The TC pin on LT8302IS8E-3#PBF outputs a PTAT voltage (1.00V at 25°C, +3.35mV/K) used to compensate for the negative temperature coefficient of the output diode (–1 to –2mV/°C). Connecting RTC between TC and RREF injects temperature-proportional current to stabilize 3.3V/5V outputs across –40°C to +125°C.
Is LT8302IS8E-3#PBF pin-compatible with LT8302IS8E#PBF?
Yes-LT8302IS8E-3#PBF and LT8302IS8E#PBF share identical pinout, package, and absolute maximum ratings. The only functional difference is boundary detection method: LT8302IS8E-3#PBF uses RREF voltage-level sensing (lower noise sensitivity), while LT8302IS8E#PBF uses RREF dv/dt slope detection.
What is the minimum load requirement for stable regulation with LT8302IS8E-3#PBF?
The LT8302IS8E-3#PBF maintains stable regulation with minimum load less than 0.5% of full output current-enabling true zero-load operation in standby modes. This is achieved via low-ripple Burst Mode® and internal sample-and-hold error amplifier timing, verified in Typical Performance Characteristics (Figure G01).
LT8302IS8E-3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- 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
- Frequency - Switching:
- Down to 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8302IS8E-3#PBF FAQ
1.How can I place an order for LT8302IS8E-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302IS8E-3#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 LT8302IS8E-3#PBF reliable?
The price and inventory of LT8302IS8E-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8302IS8E-3#PBF is usually 5 days.
3.What payment methods are accepted for LT8302IS8E-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302IS8E-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302IS8E-3#PBF?
LT8302IS8E-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302IS8E-3#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 LT8302IS8E-3#PBF?
For technical support, including LT8302IS8E-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302IS8E-3#PBF requirements.
6.How does Aetrix verify that LT8302IS8E-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT8302IS8E-3#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 LT8302IS8E-3#PBF meets industry standards.
7.What is the process for return or replacement of LT8302IS8E-3#PBF?
All LT8302IS8E-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302IS8E-3#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 LT8302IS8E-3#PBF part is unused and in its original packaging.
Return procedure for LT8302IS8E-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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