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Analog Devices Inc. LT8302ES8E#TRPBF
- Part No.:
- LT8302ES8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302ES8E#TRPBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,525
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Product details
Overview
LT8302ES8E#TRPBF 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 high efficiency at heavy load and low-ripple Burst Mode® at light load, and targets auxiliary/housekeeping power in automotive and industrial systems.
For engineers reviewing the LT8302ES8E#TRPBF datasheet, LT8302ES8E#TRPBF pinout, LT8302ES8E#TRPBF application, or LT8302ES8E#TRPBF equivalent, key selection criteria include its 106µA sleep-mode quiescent current, 3.6A/65V internal switch rating, ±1% RREF reference accuracy, thermally enhanced 8-lead SO package with exposed GND pad, and AEC-Q100 qualification for automotive use.
Technical Context
The LT8302ES8E#TRPBF 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 directly measures isolated output voltage from the primary-side flyback pulse, eliminating need for opto-isolators or auxiliary windings.
At light load, it transitions to low-ripple Burst Mode® operation with 12kHz minimum switching frequency, maintaining high efficiency while ensuring sufficient sampling intervals for stable regulation. 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 without external pre-regulation. |
| Integrated Switch | 65V breakdown, 3.6A peak, 80mΩ RDS(ON) - enables compact 18W isolated designs with minimal external components. |
| Quiescent Current | 106µA in Sleep Mode - extends battery life in always-on auxiliary supplies. |
| RREF Reference Voltage | 1.00V ±2% - provides precise output programming with external resistor divider. |
| Switching Modes | Boundary mode (heavy load), Discontinuous mode (mid-load), Low-ripple Burst Mode® (light load) - balances efficiency, EMI, and regulation across full load range. |
| Package | 8-Lead Plastic SO with exposed GND pad - θJA = 33°C/W enables high-power density without heatsink. |
| Temperature Grade | –40°C to 125°C junction - qualified per AEC-Q100 for automotive under-hood applications. |
Pinout & Package
LT8302ES8E#TRPBF is housed in an 8-lead plastic SO package with exposed thermal pad (Pin 9, GND), requiring soldering to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input Undervoltage Lockout Input | Accurate 1.214V enable threshold with 14mV hysteresis; enables VIN UVLO programming or direct tie-to-VIN for always-on operation. |
| 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 and Signal Ground | Primary return path; exposed pad must be soldered to PCB ground plane for thermal management and noise reduction. |
| SW (Pin 5) | Drain of Integrated 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 | Samples flyback pulse amplitude; connects to transformer SW node via resistor to set output voltage with RREF. |
| RREF (Pin 7) | Reference Resistor Input | Ground-referred node for RREF resistor; sets feedback gain; trimmed for 10k nominal value and ±1% reference accuracy. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1V at 25°C, 3.35mV/K); used with RTC resistor to offset diode VF drift in low-voltage outputs (e.g., 3.3V, 5V). |
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 down to 0.5% full-load current. |
| Internal compensation and soft-start | Eliminates external compensation network; 11ms soft-start prevents inrush current and ensures monotonic startup. |
| Output short-circuit protection | Auto-recovery foldback limits power dissipation during sustained fault conditions without latch-up or external sensing. |
| AEC-Q100 qualified (Grade E) | Validated for automotive applications including infotainment, ADAS sensors, and body electronics with –40°C to 125°C operation. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Sensors |
|---|---|
Use Scenario: Providing isolated 5V/1A housekeeping power to CAN transceivers and microcontrollers in engine control units. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller managing isolation barrier and output voltage stability without secondary-side feedback components. Use Value: Enables compact, AEC-Q100-compliant 18W auxiliary supply with <106µA sleep current-reducing parasitic drain on vehicle battery during ignition-off state. | Use Scenario: Generating isolated 3.3V bias for analog front-end circuits in hazardous-area pressure transmitters. IC Role / Device Role / Timing Role: Micropower isolated DC/DC converter delivering safety-rated galvanic isolation between field-side sensors and control-side processors. Use Value: Achieves <±1.5% output regulation over –40°C to 85°C using TC-pin temperature compensation-critical for precision sensor signal conditioning. |
| Medical Patient Monitoring | Smart Building Controllers |
Use Scenario: Powering isolated ADCs and wireless modules in portable ECG devices requiring reinforced insulation per IEC 60601-1. IC Role / Device Role / Timing Role: Safety-certifiable isolated flyback controller enabling creepage/clearance compliance without optocouplers or custom transformers. Use Value: Reduces system-level certification effort by integrating regulation, protection, and thermal monitoring into single AEC-Q100-grade IC. | Use Scenario: Delivering isolated 12V/0.5A power to DALI bus interfaces and HVAC actuators in energy-management gateways. IC Role / Device Role / Timing Role: High-efficiency boundary-mode flyback controller supporting wide 12–42V DC input from PoE or solar-charged batteries. Use Value: Maintains >85% efficiency from 10% to 100% load via adaptive mode switching-extending runtime in battery-backed smart building nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8304ES8E#TRPBF | Higher 100V/5A switch, 42VIN max, same package and control architecture | Better suited for 24V/48V industrial inputs requiring higher surge tolerance and >25W output | Select when input exceeds 42V or output power >18W is needed; shares layout compatibility but requires re-optimization of transformer turns ratio. |
| UCC28740DR | 65V/2.5A switch, 90VIN max, PSR flyback controller with different sampling method and no TC pin | Lacks temperature compensation; requires tighter diode VF matching for 5V output stability over temperature | Choose for cost-sensitive non-automotive applications where ±3% output tolerance is acceptable and transformer leakage inductance is well-controlled. |
Compared with LT8304ES8E#TRPBF and UCC28740DR, the LT8302ES8E#TRPBF offers superior light-load efficiency via low-ripple Burst Mode®, integrated TC compensation for ±1% 5V output accuracy over temperature, and AEC-Q100 qualification-making it optimal for space-constrained automotive auxiliary supplies.
Availability
LT8302ES8E#TRPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial isolated sensors, medical patient monitoring, and smart building controllers requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8302ES8E#TRPBF 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, automotive, and communications markets.
The LT8302 product line delivers micropower primary-side regulated isolated flyback controllers optimized for compact, reliable, and certification-friendly auxiliary power in harsh environments-especially where opto-isolator elimination and automotive qualification are critical.
FAQ
What is the maximum isolated output power achievable with LT8302ES8E#TRPBF?
The LT8302ES8E#TRPBF delivers up to 18W of isolated output power. This is achieved with a 3.6A/65V internal DMOS switch, boundary mode operation, and proper transformer design-for example, a 5V/3.6A output at 24V input. Maximum power depends on input voltage, transformer turns ratio, and thermal management; the datasheet provides curves for 3.3V, 5V, 12V, and 24V outputs across 3V–42V input range. The LT8302ES8E#TRPBF maintains this capability within its –40°C to 125°C operating junction temperature range.
Does LT8302ES8E#TRPBF require an opto-isolator or third transformer winding for regulation?
No, the LT8302ES8E#TRPBF does not require an opto-isolator or third transformer winding. It samples the isolated output voltage directly from the primary-side flyback waveform at the SW pin, using a proprietary sample-and-hold error amplifier that triggers when secondary current reaches zero. This primary-side regulation eliminates opto aging, nonlinearity, and extra winding losses-reducing component count, cost, and board area. The LT8302ES8E#TRPBF achieves ±1.5% typical output regulation without secondary feedback components.
How does the TC pin on LT8302ES8E#TRPBF improve output voltage accuracy?
The TC pin on LT8302ES8E#TRPBF provides a proportional-to-absolute-temperature (PTAT) voltage (1V at 25°C, 3.35mV/K) to compensate for the negative temperature coefficient of the output diode's forward voltage (–1 to –2mV/°C). By connecting an RTC resistor between TC and RREF pins, a PTAT current offsets diode VF drift-reducing output variation from ±3% to ±1% over temperature for 5V outputs. This compensation is essential for precision low-voltage rails and is implemented entirely on the primary side. The LT8302ES8E#TRPBF's TC functionality is validated across its full –40°C to 125°C operating range.
What are the key differences between LT8302ES8E#TRPBF and LT8302-3 variants?
The LT8302ES8E#TRPBF belongs to the standard LT8302 family (not LT8302-3), distinguished by its boundary detection method: it uses dv/dt slope sensing on the RREF pin, whereas LT8302-3 uses voltage-level detection. Both achieve identical regulation performance with low-leakage transformers, but LT8302-3 offers lower noise sensitivity on RREF-making it preferred for multi-output designs. The LT8302ES8E#TRPBF retains full feature parity: same 3.6A/65V switch, 106µA sleep current, TC compensation, and AEC-Q100 qualification as LT8302-3 variants.
Is LT8302ES8E#TRPBF suitable for automotive applications?
Yes, the LT8302ES8E#TRPBF is AEC-Q100 qualified (Grade E, –40°C to 125°C) and specifically designed for automotive auxiliary and housekeeping power supplies. It integrates output short-circuit protection, EN/UVLO with accurate hysteresis, and robust EMI mitigation features-including minimized SW node trace area and boundary-mode valley switching. Its thermally enhanced 8-lead SO package with exposed GND pad ensures reliable operation under under-hood thermal stress. The LT8302ES8E#TRPBF is widely deployed in infotainment systems, ADAS camera modules, and body control units requiring isolated, low-quiescent-power DC/DC conversion.
LT8302ES8E#TRPBF 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):
- 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#TRPBF FAQ
1.How can I place an order for LT8302ES8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302ES8E#TRPBF 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#TRPBF reliable?
The price and inventory of LT8302ES8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8302ES8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8302ES8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302ES8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302ES8E#TRPBF?
LT8302ES8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302ES8E#TRPBF 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#TRPBF?
For technical support, including LT8302ES8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302ES8E#TRPBF requirements.
6.How does Aetrix verify that LT8302ES8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8302ES8E#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8302ES8E#TRPBF?
All LT8302ES8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302ES8E#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT8302ES8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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