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Analog Devices Inc. LT8302ES8E#PBF
- Part No.:
- LT8302ES8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302ES8E#PBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,491
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Product details
Overview
LT8302ES8E#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, supports boundary mode for heavy loads and low-ripple Burst Mode® for light loads, and targets auxiliary/housekeeping power in automotive and industrial systems.
For engineers reviewing the LT8302ES8E#PBF datasheet, LT8302ES8E#PBF pinout, LT8302ES8E#PBF application, or LT8302ES8E#PBF equivalent, key selection criteria include its 106µA sleep-mode quiescent current, 3.6A/65V internal switch rating, ±1% RREF reference accuracy, AEC-Q100 qualification (E-grade), and thermally enhanced 8-lead SO package with exposed GND pad.
Technical Context
The LT8302ES8E#PBF implements quasi-resonant boundary conduction mode at heavy load-sensing zero secondary current via SW pin valley detection-to enable small magnetics and excellent load regulation. Its sample-and-hold error amplifier samples the flyback pulse amplitude during demagnetization to derive isolated output voltage without opto-couplers or auxiliary windings.
At light load, it transitions to low-ripple Burst Mode® operation with 12kHz minimum switching frequency, alternating between active and sleep modes to maintain high efficiency while preserving output voltage accuracy. Internal compensation, soft-start, EN/UVLO with 1.214V threshold and 14mV hysteresis, and temperature-compensated feedback via TC pin further define its control architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-input industrial and automotive battery rails including cold-crank and load-dump conditions. |
| Integrated Switch | 65V breakdown / 3.6A peak current - enables compact 18W isolated designs without external MOSFET or driver. |
| Quiescent Current | 106µA in sleep mode - minimizes no-load power loss in always-on auxiliary supplies. |
| RREF Reference Voltage | 1.00V ±2% - provides stable feedback reference for precise output voltage programming via resistor divider. |
| Switching Modes | Boundary mode (heavy load) + Low-ripple Burst Mode® (light load) - balances efficiency, EMI, and output ripple across full load range. |
| Package | 8-Lead Plastic SO with exposed GND pad - θJA = 33°C/W thermal resistance enables high-power density without heatsink. |
| AEC-Q100 Grade | Grade E (–40°C to +125°C junction) - qualified for automotive auxiliary power applications per AEC-Q100 Rev H. |
Pinout & Package
LT8302ES8E#PBF is housed in an 8-lead plastic SO package with exposed GND pad (Pin 9), requiring soldering to PCB ground plane for thermal and electrical performance. Pin 1 is EN/UVLO; Pin 2 is INTVCC; Pin 3 is VIN; Pin 4 and Pin 9 are GND; Pin 5 is SW (drain of internal DMOS switch); Pin 6 is RFB; Pin 7 is RREF; Pin 8 is TC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and input undervoltage lockout input | Pull below 0.3V to shut down; 1.214V threshold with 14mV hysteresis enables programmable VIN UVLO using resistor divider. |
| INTVCC (Pin 2) | Internal 3V LDO output | Powers internal circuitry; must be bypassed with ≥1µF ceramic capacitor to GND; not for external supply injection. |
| VIN (Pin 3) | Main input supply rail | Supplies internal logic and gate driver; also serves as reference for RFB feedback network. |
| GND (Pin 4 & Exposed Pad Pin 9) | Power and signal ground reference | Exposed pad is electrically and thermally connected to GND; mandatory soldering to PCB ground plane required. |
| 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 current input from transformer primary | Converts flyback pulse amplitude into current; ratio with RREF sets output voltage; sensitive to layout parasitics. |
| RREF (Pin 7) | Ground-referenced reference resistor terminal | Accepts ~10kΩ resistor; internal 1.00V reference forces RREF voltage to match VREF for accurate regulation. |
| TC (Pin 8) | Temperature compensation output | PTAT voltage (1V at 25°C, 3.35mV/K) used to offset output diode VF drift via RTC resistor to RREF. |
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 dynamic response limitations. |
| Low-ripple Burst Mode® operation | Maintains <15mVpp output ripple at light load while achieving >80% efficiency at 10mA output current (VIN=12V). |
| Boundary mode with valley switching | Enables zero-current switching for high efficiency and small transformer size; eliminates subharmonic oscillation. |
| Internal compensation and soft-start | Eliminates external compensation components; 11ms soft-start prevents inrush current and eases system integration. |
| Output short-circuit protection | Auto-recovery protection limits fault energy and maintains reliability during sustained short-circuit events. |
Applications
| Automotive Auxiliary Power Supply | Industrial Isolated Housekeeping Rail |
|---|---|
Use Scenario: Providing isolated 5V/1A auxiliary power for infotainment MCU, CAN transceiver, and sensor interface in 12V vehicle battery systems with cold-crank (4.5V) and load-dump (42V) transients. IC Role / Device Role / Timing Role: Primary-side regulated isolated flyback controller performing output voltage sensing, switching control, and protection functions without secondary-side feedback components. Use Value: Enables AEC-Q100-compliant, compact, and robust auxiliary supply with <0.5% minimum load requirement and 106µA sleep current for always-on functionality. | Use Scenario: Generating isolated 3.3V/500mA housekeeping power for PLC I/O modules, where galvanic isolation is required between field-side and controller-side circuits. IC Role / Device Role / Timing Role: Micropower isolated flyback controller implementing boundary mode for high efficiency at full load and low-ripple Burst Mode® for standby operation. Use Value: Delivers 18W isolated output with no opto-isolator, reducing failure points and enabling long-term reliability in harsh industrial environments. |
| Medical Sensor Isolation Interface | Smart Building IoT Node Power |
Use Scenario: Powering isolated analog front-end (AFE) and ADC for patient-connected biosensors requiring reinforced isolation and low leakage current. IC Role / Device Role / Timing Role: Isolated flyback controller regulating output from primary side only, eliminating optocoupler-based feedback that could compromise creepage/clearance or add latency. Use Value: Meets medical isolation standards (IEC 60601-1) with minimal component count and supports temperature-compensated output for stable sensor biasing over ambient range. | Use Scenario: Supplying isolated 5V/200mA power to wireless sensor nodes in smart lighting or HVAC controls, where energy efficiency and long battery life are critical. IC Role / Device Role / Timing Role: High-efficiency isolated DC-DC controller operating in low-ripple Burst Mode® to minimize no-load consumption while maintaining tight output regulation. Use Value: Achieves >85% efficiency at 10mA load and 106µA sleep current-extending node lifetime and reducing thermal dissipation in enclosed fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8301ES8E#PBF | Lower 30V switch rating (vs. 65V), 2.5A max switch current, 3.3V to 42V input range | Suitable for ≤10W outputs and lower-voltage input systems; lacks AEC-Q100 qualification | Select when input voltage stays below 30V and output power ≤10W; not recommended for automotive or 42V industrial inputs. |
| UCC28740DR | 30V switch, 2.5A peak, 12V to 30V input, PSR with different sampling method, no TC pin | Targets consumer AC/DC adapters; lacks temperature compensation and AEC-Q100 grade | Use for cost-sensitive, non-automotive, non-medical isolated supplies where output stability over temperature is less critical. |
Compared with LT8302ES8E#PBF, LT8301ES8E#PBF offers reduced voltage/current capability but identical package and feature set for lower-power use cases, while UCC28740DR provides TI's PSR architecture with different control loop behavior and no built-in temperature compensation-requiring external design effort for stable low-voltage outputs.
Availability
LT8302ES8E#PBF is available at Aetrix Electronics and suitable for automotive auxiliary power supplies, industrial isolated housekeeping rails, and medical sensor isolation interfaces requiring stable component supply, AEC-Q100 compliance, and long-lifecycle support.
Supply support for LT8302ES8E#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, power, and RF applications across industrial, automotive, communications, and healthcare markets.
The LT8302 product line delivers micropower isolated flyback controllers with primary-side regulation, targeting compact, reliable, and certification-ready auxiliary power solutions for safety-critical and space-constrained systems.
FAQ
What is the maximum output power achievable with LT8302ES8E#PBF?
The LT8302ES8E#PBF delivers up to 18W of isolated output power, verified across input voltages from 3V to 42V. This assumes proper transformer design with ≤50V switch stress during off-time (15V margin below 65V rating) and appropriate RFB/RREF/RTC resistor selection. Real-world output depends on transformer turns ratio, diode selection, and PCB layout thermal performance.
Does LT8302ES8E#PBF require an opto-isolator or third transformer winding?
No, the LT8302ES8E#PBF does not require an opto-isolator or third transformer winding. It regulates output voltage by sampling the primary-side flyback pulse waveform at the SW pin during demagnetization, enabling true primary-side regulation with minimal external components and improved long-term reliability.
How does the TC pin function in LT8302ES8E#PBF?
The TC pin of LT8302ES8E#PBF provides a proportional-to-absolute-temperature (PTAT) voltage (1V at 25°C, 3.35mV/K) used to compensate for the negative temperature coefficient of the output diode forward voltage. Connecting an RTC resistor between TC and RREF injects PTAT current into the feedback network, correcting output voltage drift across temperature-critical for stable 3.3V or 5V outputs.
What are the key differences between LT8302ES8E#PBF and LT8302-3 variants?
The LT8302ES8E#PBF uses dv/dt-based boundary detection on the RREF pin, while LT8302-3 variants use voltage-level detection. LT8302-3 is recommended for multi-output transformers due to lower noise sensitivity on RREF. Both share identical pinout, specs, and package; the difference lies solely in internal boundary detection logic-not in electrical ratings or thermal performance.
Is LT8302ES8E#PBF qualified for automotive applications?
Yes, the LT8302ES8E#PBF is AEC-Q100 qualified for automotive applications (Grade E, –40°C to +125°C junction temperature). It meets stress test requirements for temperature cycling, humidity, and mechanical shock, and is designated for use in automotive auxiliary and housekeeping power supplies per Analog Devices' automotive product program.
LT8302ES8E#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
LT8302ES8E#PBF FAQ
1.How can I place an order for LT8302ES8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302ES8E#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 LT8302ES8E#PBF reliable?
The price and inventory of LT8302ES8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8302ES8E#PBF is usually 5 days.
3.What payment methods are accepted for LT8302ES8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302ES8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302ES8E#PBF?
LT8302ES8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302ES8E#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 LT8302ES8E#PBF?
For technical support, including LT8302ES8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302ES8E#PBF requirements.
6.How does Aetrix verify that LT8302ES8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8302ES8E#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 LT8302ES8E#PBF meets industry standards.
7.What is the process for return or replacement of LT8302ES8E#PBF?
All LT8302ES8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302ES8E#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 LT8302ES8E#PBF part is unused and in its original packaging.
Return procedure for LT8302ES8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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