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Analog Devices Inc. LT8302IS8E#PBF
- Part No.:
- LT8302IS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302IS8E#PBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,835
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Product details
Overview
LT8302IS8E#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 by sampling the primary-side flyback waveform in boundary mode, enabling compact auxiliary power supplies in automotive and industrial systems.
For engineers reviewing the LT8302IS8E#PBF datasheet, LT8302IS8E#PBF pinout, LT8302IS8E#PBF application, or LT8302IS8E#PBF equivalent, key selection considerations include its 106µA sleep-mode quiescent current, quasi-resonant boundary mode operation, low-ripple Burst Mode® at light load, AEC-Q100 qualification for automotive use, and thermally enhanced 8-lead SO package with exposed GND pad.
Technical Context
The LT8302IS8E#PBF implements current-mode control with a novel flyback pulse sense circuit and sample-and-hold error amplifier that samples the isolated output voltage during zero-secondary-current events. Its boundary mode detector triggers switch turn-on at the SW pin valley, enabling high efficiency and excellent load regulation without external compensation.
It supports dual operating modes: quasi-resonant boundary conduction mode at heavy load (variable frequency, variable peak current) and discontinuous conduction mode with internal 380kHz max frequency clamp at medium load; at very light loads, it enters low-ripple Burst Mode® with 12kHz minimum switching frequency and transitions between sleep (106µA IQ) and active (380µA IQ) states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-input industrial and automotive battery-supplied systems including cold-crank scenarios. |
| Integrated Switch | 65V/3.6A DMOS - enables 18W isolated output with minimal external components; RDS(ON) = 80mΩ ensures low conduction loss. |
| Quiescent Current | 106µA in Sleep Mode - extends battery life in always-on auxiliary power rails; 380µA in Active Mode maintains regulation under load. |
| Regulation Method | No-opto, primary-side sensing - eliminates opto-isolator and third winding, reducing BOM cost, size, and long-term drift issues. |
| Operating Modes | Boundary mode (heavy load), discontinuous mode (medium load), low-ripple Burst Mode® (light load) - balances efficiency, EMI, and output ripple across full load range. |
| Temperature Range | –40°C to +125°C junction - qualified per AEC-Q100 Grade I, suitable for under-hood and industrial control environments. |
| Package | 8-Lead Plastic SO with exposed GND pad - θJA = 33°C/W enables high-power density without heatsink in space-constrained designs. |
Pinout & Package
LT8302IS8E#PBF is housed in a thermally enhanced 8-lead plastic SO package (S8E) with exposed GND pad (Pin 9), which must be soldered to PCB for thermal and electrical performance. The package measures 4.9mm × 6.0mm × 1.75mm (max) and features gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input Undervoltage Lockout Input | Accurate 1.214V enable threshold with 14mV hysteresis; allows programmable VIN UVLO using resistor divider; pull <0.3V to shut down. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Supplies internal logic and gate driver; requires ≥1µF local ceramic bypass; must not be externally overdriven. |
| VIN (Pin 3) | Main Input Supply | 3V–42V input connection; powers internal circuitry and serves as reference for RFB feedback network. |
| GND (Pin 4 & Exposed Pad Pin 9) | Power and Signal Ground | Common return for all circuits; exposed pad provides primary thermal path and must be soldered to PCB ground plane. |
| SW (Pin 5) | Drain of Integrated 65V/3.6A DMOS Switch | Connects to transformer primary; 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 voltage via VREF = 1.00V. |
| RREF (Pin 7) | Reference Resistor Input | Ground-referred resistor (typically 10kΩ); sets feedback gain; internal 1.00V reference ensures stable output programming. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1V at 25°C, 3.35mV/K); used with RTC resistor to compensate output diode forward-voltage drift. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates opto-isolator and third winding - reduces component count, cost, and long-term reliability risk from opto aging/nonlinearity. |
| Low-ripple Burst Mode® | Maintains <15mVPP output ripple at light load while achieving >80% efficiency at 10mA, critical for noise-sensitive analog/RF subsystems. |
| Internal compensation & soft-start | Reduces external parts count; 11ms soft-start prevents inrush current and transformer saturation during startup. |
| Output short-circuit protection | Auto-recovery protection limits fault energy and prevents thermal runaway during sustained short-circuit conditions. |
| Temperature-compensated output | TC pin enables ±0.5% output voltage stability over –40°C to +125°C for 5V outputs, compensating diode VF drift without external sensors. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Bias Supply |
|---|---|
|
Use Scenario: Providing isolated 5V/1A housekeeping power to CAN transceivers, microcontrollers, and sensor interfaces in engine control units (ECUs). IC Role / Device Role / Timing Role: Primary-side regulated flyback controller managing isolation barrier and dynamic load response without secondary-side feedback components. Use Value: AEC-Q100 qualification and –40°C to +125°C operation ensure reliable startup and regulation during cold cranking and under-hood thermal stress. |
Use Scenario: Generating isolated 3.3V/0.5A supply for PLC I/O modules requiring galvanic separation between field-side and logic-side circuits. IC Role / Device Role / Timing Role: Self-contained flyback controller implementing boundary mode for tight load regulation and low EMI in dense industrial backplanes. Use Value: No-opto architecture eliminates optocoupler lifetime degradation, ensuring >10-year field reliability in unattended infrastructure equipment. |
| Medical Patient-Monitoring Isolation | Smart Sensor Node Power |
|
Use Scenario: Delivering isolated 5V power to analog front-end amplifiers and ADCs in portable patient monitors requiring 1×MOPP creepage/clearance compliance. IC Role / Device Role / Timing Role: High-integration flyback controller enabling compact transformer design and precise output regulation without secondary feedback loop latency. Use Value: 106µA sleep-mode IQ extends battery runtime in portable devices; low-ripple Burst Mode® preserves signal integrity in sensitive biopotential measurements. |
Use Scenario: Powering ultra-low-power wireless sensor nodes (e.g., LoRaWAN, NB-IoT) with intermittent wake-up cycles and multi-year battery life requirements. IC Role / Device Role / Timing Role: Micropower flyback controller managing burst-mode transitions and maintaining regulation during microsecond-scale load transients. Use Value: Minimum load <0.5% of full output enables stable regulation even during deep-sleep intervals where load drops to ~100µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8304IS8E#PBF | Higher 100V/4.5A switch rating; supports up to 25W output; identical pinout and feature set except increased voltage/current capability. | Better suited for 24V input systems requiring >18W or higher surge tolerance; same PCB layout but requires revised transformer and MOSFET stress analysis. | Select LT8304IS8E#PBF when input can exceed 42V or output power demand exceeds 18W; otherwise LT8302IS8E#PBF offers optimal cost/performance for ≤42VIN/18W designs. |
| UCC28740DR | TI's no-opto flyback controller with 700V HV start-up; 3.5A/65V switch; different pinout; lacks TC pin and AEC-Q100 qualification. | Targets universal AC-input offline converters (85–265VAC); not rated for automotive temperature range or DC-input battery systems. | Choose UCC28740DR only for AC/DC adapter applications; LT8302IS8E#PBF is preferred for DC-input isolated supplies requiring automotive-grade reliability and temperature compensation. |
Compared with LT8304IS8E#PBF and UCC28740DR, the LT8302IS8E#PBF delivers optimal balance of micropower operation (106µA sleep IQ), AEC-Q100 qualification, and integrated temperature compensation - making it uniquely suited for automotive and industrial DC-input isolated bias supplies below 18W.
Availability
LT8302IS8E#PBF is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, medical monitoring devices, and smart sensor nodes requiring stable component supply with guaranteed long-term availability.
Supply support for LT8302IS8E#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LT8302 product line delivers micropower isolated flyback controllers optimized for compact, reliable, and low-EMI auxiliary power in harsh-environment applications - specifically designed to replace opto-based solutions in automotive and industrial systems.
FAQ
What is the maximum output power achievable with LT8302IS8E#PBF?
The LT8302IS8E#PBF delivers up to 18W of isolated output power, verified across 3V–42V input range with appropriate transformer design. At VIN = 24V and 5V output, typical continuous output is 2.9A; at VIN = 12V, it supports 2.0A; and at VIN = 5V, up to 1.1A. Power capability depends on transformer turns ratio, core selection, and thermal management - the 65V/3.6A switch and 80mΩ RDS(ON) enable this performance in an 8-lead SO package.
Does LT8302IS8E#PBF require an opto-isolator or third transformer winding?
No, the LT8302IS8E#PBF does not require an opto-isolator or third transformer winding. It achieves precise isolated output regulation by sampling the primary-side flyback waveform at zero-secondary-current events using its integrated flyback pulse sense circuit and sample-and-hold error amplifier. This no-opto architecture reduces component count, cost, and long-term reliability risks associated with optocoupler aging and nonlinearities.
How does the TC pin on LT8302IS8E#PBF improve output voltage accuracy?
The TC pin on LT8302IS8E#PBF provides a proportional-to-absolute-temperature (PTAT) voltage (1V at 25°C, 3.35mV/K) that enables compensation of the output diode's negative temperature coefficient (–1 to –2mV/°C). By connecting an RTC resistor between TC and RREF pins, a PTAT current adjusts the feedback network to counteract VF drift - improving 5V output stability to ±0.5% over –40°C to +125°C without external sensors or calibration.
What are the key differences between LT8302IS8E#PBF and LT8302IS8E-3#PBF?
The LT8302IS8E#PBF and LT8302IS8E-3#PBF differ only in boundary detection method: the LT8302 uses dv/dt sensing on the RREF pin, while the LT8302-3 uses voltage-level sensing. Both deliver identical performance with low-leakage transformers, but the LT8302-3 variant offers lower noise sensitivity on RREF - making it preferred for multi-output flyback designs where cross-regulation and noise immunity are critical.
Is LT8302IS8E#PBF qualified for automotive applications?
Yes, the LT8302IS8E#PBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to +125°C junction temperature). It meets stringent automotive reliability, thermal, and ESD requirements and is manufactured with controlled processes supporting automotive quality standards. The part marking "I" in LT8302IS8E#PBF explicitly denotes the automotive-grade temperature grade.
LT8302IS8E#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):
- 2.8V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- 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#PBF FAQ
1.How can I place an order for LT8302IS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302IS8E#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#PBF reliable?
The price and inventory of LT8302IS8E#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#PBF is usually 5 days.
3.What payment methods are accepted for LT8302IS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302IS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302IS8E#PBF?
LT8302IS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302IS8E#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#PBF?
For technical support, including LT8302IS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302IS8E#PBF requirements.
6.How does Aetrix verify that LT8302IS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8302IS8E#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#PBF meets industry standards.
7.What is the process for return or replacement of LT8302IS8E#PBF?
All LT8302IS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302IS8E#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#PBF part is unused and in its original packaging.
Return procedure for LT8302IS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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