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Analog Devices Inc. LT8302IS8E-3#TRPBF
- Part No.:
- LT8302IS8E-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302IS8E-3#TRPBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,258
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Product details
Overview
LT8302IS8E-3#TRPBF from Analog Devices is a monolithic micropower isolated flyback controller 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, supporting 5V isolated supplies for automotive housekeeping rails.
For engineers reviewing the LT8302IS8E-3#TRPBF datasheet, LT8302IS8E-3#TRPBF pinout, LT8302IS8E-3#TRPBF application, or LT8302IS8E-3#TRPBF equivalent, key selection criteria include its 106µA sleep-mode quiescent current, AEC-Q100 qualification, 3.6A/65V internal switch, quasi-resonant boundary mode operation, and temperature-compensated output regulation via TC pin.
Technical Context
The LT8302IS8E-3#TRPBF implements current-mode control with a novel flyback pulse sense circuit and sample-and-hold error amplifier that samples output voltage during zero-secondary-current events. Its boundary mode detector triggers switch turn-on at the SW pin valley, enabling accurate regulation without secondary-side feedback components.
This variant uses RREF-pin voltage-level boundary detection (vs. dv/dt slope in LT8302), reducing noise sensitivity in multi-output transformer designs. It integrates internal compensation, soft-start, EN/UVLO with 1.214V enable threshold and 14mV hysteresis, and output short-circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-input industrial and automotive battery-supplied systems without external pre-regulation. |
| Integrated Switch | 65V breakdown / 3.6A current limit - enables compact 18W isolated flyback designs with minimal external components. |
| Quiescent Current | 106µA in sleep mode - extends battery life in always-on auxiliary power applications. |
| Output Regulation Method | No opto-isolator or third winding required - reduces BOM cost, PCB area, and long-term reliability risks from opto aging. |
| Operating Modes | Quasi-resonant boundary mode (heavy load) + low-ripple Burst Mode® (light load) - maintains >75% efficiency from 10mA to full load. |
| Temperature Range | –40°C to 125°C junction - qualified per AEC-Q100 for under-hood automotive auxiliary supplies. |
| Reference Voltage | 1.00V ±2% on RREF pin - sets output voltage with two external resistors; enables precise 5V or 3.3V isolated outputs. |
Pinout & Package
LT8302IS8E-3#TRPBF is housed in an 8-lead plastic SO package (S8E) with exposed thermal pad (Pin 9, GND). The package provides θJA = 33°C/W and requires soldering of the exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and input undervoltage lockout input | Shuts down device below 0.75V; enables at 1.214V with 14mV hysteresis - allows programmable VIN UVLO using resistor divider. |
| INTVCC (Pin 2) | Internal 3V LDO output | Powers internal logic and gate driver; must be bypassed with ≥1µF ceramic capacitor - no external supply allowed. |
| VIN (Pin 3) | Main input supply connection | Supplies internal circuitry and serves as reference for RFB feedback - requires local bulk capacitance. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power and signal ground reference | Exposes thermal pad for PCB heat sinking; both pins must connect to solid 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 current input from transformer SW node | Converts flyback pulse amplitude into current; ratio with RREF sets output voltage - sensitive to layout parasitics. |
| RREF (Pin 7) | Ground-referenced reference resistor input | Sets 1.00V reference point; resistor value ~10kΩ - determines output voltage scaling and enables temperature compensation. |
| TC (Pin 8) | Temperature compensation output | Provides PTAT voltage (1V at 25°C, 3.35mV/K) - connects to RREF via RTC resistor to cancel diode VF drift. |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding | Eliminates opto aging, nonlinearity, and transformer complexity - improves long-term stability and reduces component count by ≥3. |
| Low-ripple Burst Mode® | Maintains <15mVPP output ripple at light loads while achieving >70% efficiency at 10mA - critical for noise-sensitive analog/RF subsystems. |
| Boundary mode operation | Enables zero-current switching at turn-on - reduces switching losses and EMI, allowing smaller magnetics than CCM designs. |
| Output short-circuit protection | Auto-recovery foldback limits power dissipation during fault - prevents thermal runaway without external current-sense circuitry. |
| Temperature-compensated regulation | TC pin enables ±2% output voltage accuracy over –40°C to 125°C for 5V outputs - compensates for Schottky diode VF drift. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Sensors |
|---|---|
|
Use Scenario: Providing isolated 5V rail for CAN transceivers and microcontrollers in engine control units (ECUs). IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without secondary feedback components. Use Value: AEC-Q100 qualification and –40°C to 125°C operation ensure reliable startup and runtime in under-hood environments. |
Use Scenario: Powering isolated analog front-ends in factory automation current/voltage sensors. IC Role / Device Role / Timing Role: Micropower isolated DC/DC converter delivering stable 3.3V/5V from 24V industrial bus. Use Value: 106µA sleep current enables energy harvesting compatibility; no opto simplifies CE/UL certification. |
| Medical Patient Monitoring | Smart Building Controllers |
|
Use Scenario: Generating isolated bias for ECG/EEG amplifiers requiring reinforced insulation per IEC 60601-1. IC Role / Device Role / Timing Role: Safety-isolated flyback controller meeting creepage/clearance requirements via transformer-only isolation. Use Value: Elimination of opto-isolator removes failure mode affecting long-term patient safety compliance. |
Use Scenario: Supplying isolated 5V for Zigbee/BLE wireless modules in HVAC controllers powered from 48V PoE. IC Role / Device Role / Timing Role: Compact flyback controller enabling single-layer PCB design with minimal BOM. Use Value: Thermally enhanced SO-8 package supports convection-cooled operation in sealed enclosures. |
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#TRPBF | Lacks TC pin and temperature compensation; 3.3A switch (vs. 3.6A); same 65V rating and boundary mode architecture. | Not suitable for precision 5V outputs over wide temperature range; limited to applications where diode VF drift is acceptable. | Select when cost reduction is prioritized over ±2% output accuracy across temperature. |
| UCC28740DR | Texas Instruments part with 700V MOSFET; higher input range (up to 450VAC rectified); no integrated TC compensation; different control algorithm. | Targeted at AC/DC offline applications; requires opto feedback for tight regulation; larger solution size due to external HV FET. | Choose only for universal-input AC/DC designs; not drop-in compatible due to topology and feedback differences. |
Compared with LT8301IS8E#TRPBF and UCC28740DR, the LT8302IS8E-3#TRPBF uniquely combines AEC-Q100 qualification, integrated temperature compensation, and no-opto regulation in an 8-lead SO package - making it optimal for space-constrained, high-reliability 5V isolated supplies.
Availability
LT8302IS8E-3#TRPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial sensor interfaces, and medical isolated bias rails requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8302IS8E-3#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, and automotive markets.
The LT8302/LT8302-3 product line delivers micropower isolated flyback controllers optimized for compact, reliable, no-opto auxiliary power in automotive, industrial, and medical systems - addressing demand for simplified safety-isolated DC/DC conversion.
FAQ
What is the maximum isolated output power achievable with LT8302IS8E-3#TRPBF?
The LT8302IS8E-3#TRPBF delivers up to 18W of isolated output power, validated across input voltages from 3V to 42V. This capability assumes proper transformer design with ≤50V switch stress during off-time, leaving 15V margin below the 65V absolute maximum rating. Real-world output depends on transformer turns ratio, core selection, and layout - e.g., a 3:1 ratio yields ~15.3W at 32V input for 5V output.
How does LT8302IS8E-3#TRPBF differ from LT8302IS8E#TRPBF?
The LT8302IS8E-3#TRPBF uses voltage-level boundary detection on the RREF pin, whereas LT8302IS8E#TRPBF relies on dv/dt slope sensing. This makes the -3 variant less sensitive to noise on RREF, improving stability in multi-output transformer designs or noisy ECU environments. Both share identical pinout, ratings, and temperature range.
Can LT8302IS8E-3#TRPBF regulate a 3.3V isolated output?
Yes, LT8302IS8E-3#TRPBF can regulate 3.3V outputs using external RFB and RREF resistors. However, due to the output diode's negative temperature coefficient (~–2mV/°C), temperature compensation via the TC pin and RTC resistor is strongly recommended to maintain ±2% accuracy over –40°C to 125°C - especially critical for low-voltage logic rails.
What is the purpose of the TC pin on LT8302IS8E-3#TRPBF?
The TC pin on LT8302IS8E-3#TRPBF provides a proportional-to-absolute-temperature (PTAT) voltage (1V at 25°C, 3.35mV/K) used to compensate for the forward-voltage drift of the output rectifier diode. Connecting a resistor (RTC) between TC and RREF injects temperature-dependent current into the feedback network, counteracting diode VF variation and enabling stable 5V or 3.3V regulation across temperature.
Is LT8302IS8E-3#TRPBF suitable for AEC-Q100 automotive applications?
Yes, LT8302IS8E-3#TRPBF is explicitly qualified per AEC-Q100 Grade I (–40°C to +125°C junction), with guaranteed performance across this range. Its integrated features - including EN/UVLO with hysteresis, output short-circuit protection, and thermally enhanced SO-8 package - meet automotive reliability and functional safety requirements for auxiliary power in ECUs and ADAS modules.
LT8302IS8E-3#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):
- 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#TRPBF FAQ
1.How can I place an order for LT8302IS8E-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302IS8E-3#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 LT8302IS8E-3#TRPBF reliable?
The price and inventory of LT8302IS8E-3#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8302IS8E-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302IS8E-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302IS8E-3#TRPBF?
LT8302IS8E-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302IS8E-3#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 LT8302IS8E-3#TRPBF?
For technical support, including LT8302IS8E-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302IS8E-3#TRPBF requirements.
6.How does Aetrix verify that LT8302IS8E-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8302IS8E-3#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 LT8302IS8E-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8302IS8E-3#TRPBF?
All LT8302IS8E-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302IS8E-3#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 LT8302IS8E-3#TRPBF part is unused and in its original packaging.
Return procedure for LT8302IS8E-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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