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Analog Devices Inc. LT8302HS8E-3#PBF
- Part No.:
- LT8302HS8E-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302HS8E-3#PBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,382
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Product details
Overview
LT8302HS8E-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 uses primary-side sensing without opto-isolator or third winding, supports boundary mode for high efficiency at heavy load and low-ripple Burst Mode® for <0.5% minimum load, and is qualified for automotive applications (–40°C to 150°C junction).
For engineers reviewing the LT8302HS8E-3#PBF datasheet, LT8302HS8E-3#PBF pinout, LT8302HS8E-3#PBF application, or LT8302HS8E-3#PBF equivalent, key selection considerations include its no-opto regulation architecture, 106µA sleep-mode quiescent current, AEC-Q100 qualification, thermally enhanced 8-lead SO package with exposed GND pad, and compatibility with temperature-compensated 5V/12V/24V isolated auxiliary supplies.
Technical Context
The LT8302HS8E-3#PBF implements quasi-resonant boundary conduction mode at heavy load-sampling the SW pin at valley turn-on when secondary current reaches zero-to achieve excellent load regulation and compact magnetics. Its internal flyback pulse sense circuit and sample-and-hold error amplifier eliminate need for opto-isolators or auxiliary windings.
At light loads, it transitions to low-ripple Burst Mode® operation with 12kHz minimum switching frequency, maintaining high efficiency while ensuring sufficient sampling intervals for accurate output voltage regulation. The LT8302-3 variant uses RREF pin voltage-level boundary detection (vs. dv/dt in LT8302), reducing noise sensitivity in multi-output transformer designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-input industrial and automotive battery rails including 12V/24V systems with cold-crank margin. |
| Integrated Switch | 65V/3.6A DMOS - enables single-chip isolated flyback up to 18W without external MOSFET or driver. |
| Quiescent Current | 106µA in Sleep Mode - minimizes standby power loss in always-on auxiliary supplies. |
| Regulation Method | Primary-side flyback waveform sampling - eliminates opto-isolator, third winding, and associated aging/nonlinearity issues. |
| Operating Modes | Boundary mode (heavy load), discontinuous mode (mid-load), low-ripple Burst Mode® (light load) - balances efficiency, EMI, and regulation across full load range. |
| Junction Temp Range | –40°C to 150°C - AEC-Q100 qualified for under-hood automotive and harsh industrial environments. |
| Package | 8-Lead Plastic SO with exposed GND pad - θJA = 33°C/W; requires soldering exposed pad to PCB ground plane for thermal integrity. |
Pinout & Package
LT8302HS8E-3#PBF is housed in a thermally enhanced 8-lead plastic SO package (S8E) with exposed GND pad (Pin 9), requiring direct soldering 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; supports programmable VIN UVLO using resistor divider. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal control logic and gate driver; must be bypassed with ≥1µF ceramic capacitor to GND; no external supply allowed. |
| VIN (Pin 3) | Main Input Supply | Supplies internal circuitry and serves as reference for RFB feedback network; requires local bulk + ceramic bypassing. |
| GND (Pin 4 & Exposed Pad Pin 9) | Power and Signal Ground | Common return for all internal blocks; exposed pad is electrically and thermally connected to GND - mandatory PCB connection. |
| SW (Pin 5) | Drain of Integrated DMOS Switch | Connects to primary side of flyback transformer; high dv/dt node - minimize trace area to reduce EMI and voltage spikes. |
| RFB (Pin 6) | Feedback Resistor Input | Connects to transformer primary SW node; forms voltage divider with RREF to set output via VREF × (RFB/RREF) × (1/NPS) – VF. |
| RREF (Pin 7) | Reference Resistor Input | Ground-referenced node for RREF resistor (typically 10kΩ); internal 1.00V reference ensures precise output programming. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1V at 25°C, 3.35mV/K); connects to RREF via RTC to compensate output diode VF drift across temperature. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates opto-isolator and third winding - reduces BOM count, cost, aging-related drift, and layout complexity in isolated supplies. |
| Low-ripple Burst Mode® | Maintains <15mVpp output ripple at light load while achieving >80% efficiency down to 0.5% of full load - critical for noise-sensitive analog/RF subsystems. |
| Thermally enhanced SO package | Exposed GND pad lowers thermal resistance to 33°C/W - enables 18W output in compact footprint without heatsink in ambient ≤70°C. |
| AEC-Q100 qualified | Rated for –40°C to 150°C junction temperature - validated for automotive body electronics, infotainment, and ADAS auxiliary power rails. |
| Internal compensation & soft-start | Reduces external component count by integrating loop compensation and 11ms soft-start - simplifies design and improves inrush current control. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Sensors |
|---|---|
Use Scenario: Providing isolated 5V/3.3V bias to CAN transceivers, LIN controllers, and isolated ADCs in engine control units and battery management systems. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller delivering reinforced isolation barrier between high-voltage traction domain and low-voltage communication domain. Use Value: AEC-Q100 qualification and 150°C operation ensure reliability in under-hood environments; no-opto architecture avoids optocoupler lifetime degradation. | Use Scenario: Powering isolated current/voltage sensors and digital isolators in motor drives, PLC I/O modules, and factory automation equipment. IC Role / Device Role / Timing Role: Micropower isolated DC-DC converter supplying clean, regulated power to isolated signal conditioning circuits across 3000Vrms+ barriers. Use Value: 106µA sleep current extends uptime in energy-constrained edge nodes; boundary mode enables small, low-cost transformers without compromising regulation. |
| Medical Patient Monitoring | Telecom Housekeeping Supply |
Use Scenario: Generating isolated 5V/12V rails for patient-connected ECG/EEG front-ends and isolated data acquisition in Class II medical devices. IC Role / Device Role / Timing Role: Safety-certified isolated power source meeting 2× MOPP requirements via transformer-based galvanic isolation. Use Value: Elimination of opto-isolator removes nonlinear transfer function and long-term gain drift - improving calibration stability over device lifetime. | Use Scenario: Delivering 3.3V/5V isolated auxiliary power to FPGA configuration circuits, clock buffers, and management controllers in telecom line cards and base station radios. IC Role / Device Role / Timing Role: High-efficiency, low-noise isolated flyback controller supporting hot-swap and graceful shutdown sequencing. Use Value: Low-ripple Burst Mode® ensures <15mVpp output noise - preventing jitter in high-speed SerDes clocks and RF synthesizers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8301HS8E#PBF | Lacks TC pin and temperature compensation; lower max switch current (2.5A vs. 3.6A); same 3V–42V input and no-opto architecture. | Suitable for non-temperature-critical 5V/12V outputs where diode VF drift is negligible; not recommended for precision 3.3V or wide-temp 24V rails. | Select LT8301HS8E#PBF only if output voltage stability over temperature is not required and peak power ≤12W suffices. |
| UCC28740DR | Texas Instruments PSR controller with 700V MOSFET; higher input range (up to 450VAC); no integrated temp compensation; different feedback topology (ZCD-based). | Better suited for universal AC-input offline adapters; requires different transformer design and lacks AEC-Q100 qualification. | Choose UCC28740DR for AC/DC applications above 100V input; avoid for automotive DC-DC due to qualification gap and higher EMI sensitivity. |
Compared with LT8301HS8E#PBF and UCC28740DR, the LT8302HS8E-3#PBF uniquely combines AEC-Q100 qualification, integrated temperature compensation (TC pin), and 3.6A/65V switch in an 8-lead SO package - making it the only option for automotive-grade, precision-regulated, low-noise isolated DC-DC conversion below 42V input.
Availability
LT8302HS8E-3#PBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial sensor interfaces, medical patient monitoring, and telecom housekeeping supplies requiring stable component supply, extended temperature operation, and regulatory-compliant isolation.
Supply support for LT8302HS8E-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 industrial, automotive, communications, and healthcare markets.
The LT8302/LT8302-3 product line delivers micropower isolated flyback controllers optimized for space-constrained, high-reliability DC-DC conversion where opto-isolator elimination, wide input range, and automotive qualification are essential.
FAQ
What is the maximum output power achievable with LT8302HS8E-3#PBF?
The LT8302HS8E-3#PBF delivers up to 18W of isolated output power, dependent on input voltage, transformer turns ratio, and output voltage. At VIN = 24V and VOUT = 5V with a 3:1 turns ratio, typical output is 2.9A (14.5W); at VIN = 32V, it reaches ~18W. Peak power is limited by the 3.6A switch current and 65V SW pin rating, with 15V margin reserved for leakage inductance spikes.
Does LT8302HS8E-3#PBF require an opto-isolator or third winding for regulation?
No, the LT8302HS8E-3#PBF does not require an opto-isolator or third winding. It regulates output voltage by sampling the isolated flyback pulse directly from the primary-side SW pin waveform using an internal flyback pulse sense circuit and sample-and-hold error amplifier - enabling true no-opto isolated operation.
How does the TC pin on LT8302HS8E-3#PBF improve output voltage accuracy?
The TC pin on LT8302HS8E-3#PBF provides a PTAT voltage (1V at 25°C, 3.35mV/K) that, when connected via RTC resistor to RREF, injects compensating current to offset the negative temperature coefficient of the output diode (–1mV/°C to –2mV/°C). This reduces output voltage drift from ±300mV to <±50mV over –40°C to 125°C for 5V outputs.
What is the difference between LT8302HS8E-3#PBF and LT8302HS8E#PBF?
The LT8302HS8E-3#PBF uses voltage-level boundary detection on the RREF pin, while the LT8302HS8E#PBF uses dv/dt slope detection. The -3 version offers lower noise sensitivity - especially beneficial in multi-output transformer designs - and is recommended when RREF node noise immunity is critical, such as in high-density or EMI-challenged layouts.
Is LT8302HS8E-3#PBF qualified for automotive applications?
Yes, LT8302HS8E-3#PBF is AEC-Q100 qualified (Grade H, –40°C to 150°C junction temperature) and manufactured under controlled automotive processes. It is designated for use in automotive applications including engine control, body electronics, infotainment, and ADAS auxiliary power supplies - with full reliability reports available from Analog Devices.
LT8302HS8E-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8302HS8E-3#PBF FAQ
1.How can I place an order for LT8302HS8E-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302HS8E-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 LT8302HS8E-3#PBF reliable?
The price and inventory of LT8302HS8E-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 LT8302HS8E-3#PBF is usually 5 days.
3.What payment methods are accepted for LT8302HS8E-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302HS8E-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302HS8E-3#PBF?
LT8302HS8E-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302HS8E-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 LT8302HS8E-3#PBF?
For technical support, including LT8302HS8E-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302HS8E-3#PBF requirements.
6.How does Aetrix verify that LT8302HS8E-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT8302HS8E-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 LT8302HS8E-3#PBF meets industry standards.
7.What is the process for return or replacement of LT8302HS8E-3#PBF?
All LT8302HS8E-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302HS8E-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 LT8302HS8E-3#PBF part is unused and in its original packaging.
Return procedure for LT8302HS8E-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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