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Analog Devices Inc. LT8302HS8E-3#TRPBF
- Part No.:
- LT8302HS8E-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302HS8E-3#TRPBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,894
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Product details
Overview
LT8302HS8E-3#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 uses primary-side sensing-no opto-isolator or third winding-and supports boundary mode for high efficiency and low ripple Burst Mode® for light-load operation in automotive auxiliary power supplies.
For engineers reviewing the LT8302HS8E-3#TRPBF datasheet, LT8302HS8E-3#TRPBF pinout, LT8302HS8E-3#TRPBF application, or LT8302HS8E-3#TRPBF equivalent, this device offers AEC-Q100 qualification, –40°C to 150°C junction temperature rating, 106µA sleep-mode quiescent current, and precise EN/UVLO threshold (1.214V) critical for robust automotive housekeeping rail design.
Technical Context
The LT8302HS8E-3#TRPBF implements quasi-resonant boundary conduction mode at heavy load-sensing zero secondary current via SW pin valley detection-to achieve excellent load regulation without external compensation. Its flyback pulse sense circuit samples the isolated output voltage directly from the primary-side flyback waveform using RFB and RREF resistors, eliminating opto-isolators and third windings.
At light loads, it transitions to low ripple Burst Mode® operation with 12kHz minimum switching frequency, maintaining high efficiency while ensuring sufficient sampling window for accurate regulation. The TC pin provides PTAT voltage (3.35mV/K) for output diode temperature compensation, enabling stable 5V/3.3V outputs across automotive temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide automotive battery range including cold-crank (3V) and load-dump transients (42V). |
| Switch Rating | 65V/3.6A DMOS - handles 50V flyback spikes with 15V margin for leakage inductance overshoot. |
| Quiescent Current | 106µA sleep mode - enables >1-year battery standby in always-on automotive modules. |
| Output Power | Up to 18W isolated - sufficient for dual-rail 5V/3.3V auxiliary supplies in ADAS ECUs. |
| Regulation Accuracy | ±1% RREF reference (1.00V) - sets output voltage with <±5% total system error including resistor and transformer tolerances. |
| Temperature Range | –40°C to 150°C junction - qualified per AEC-Q100 Grade H for under-hood automotive use. |
| EN/UVLO Threshold | 1.214V ±36mV - enables precise input undervoltage lockout with 14mV hysteresis for stable startup. |
Pinout & Package
LT8302HS8E-3#TRPBF is housed in an 8-lead plastic SO package (S8E) with exposed thermal pad (Pin 9, GND), θJA = 33°C/W. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input UVLO Sense | Pull below 0.3V to shut down; 1.214V threshold enables programmable VIN lockout with resistor divider. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal logic; requires ≥1µF ceramic bypass to GND-no external supply allowed. |
| VIN (Pin 3) | Main Input Supply | Supplies control circuitry and serves as reference for RFB feedback network. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power & Signal Ground | Exposure pad is mandatory GND connection for thermal dissipation and noise immunity. |
| SW (Pin 5) | Drain of Integrated DMOS Switch | Connects to transformer primary; minimize trace area to reduce EMI and voltage ringing. |
| RFB (Pin 6) | Feedback Current Input | Converts flyback pulse amplitude into current; ratio with RREF sets output voltage. |
| RREF (Pin 7) | Reference Resistor Terminal | Ground-referenced node for 1.00V internal reference; sets gain for RFB-derived feedback. |
| TC (Pin 8) | PTAT Temperature Compensation | Outputs 1V at 25°C (3.35mV/K); used with RTC resistor to cancel diode VF drift. |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces BOM count by ≥3 components and eliminates opto aging/nonlinearity issues in 10+ year automotive life. |
| Low ripple Burst Mode® operation | Maintains <50mVPP output ripple at 10mA load while achieving >75% efficiency-critical for noise-sensitive analog rails. |
| Boundary mode with valley switching | Enables zero-current turn-on, minimizing switching losses and allowing smaller magnetics (e.g., 9µH) vs. CCM designs. |
| Integrated soft-start and compensation | Eliminates external RC networks; 11ms internal soft-start prevents inrush current in multi-rail systems. |
| AEC-Q100 Grade H qualification | Validated for –40°C to 150°C operation with overtemperature protection-meets ISO/TS 16949 production requirements. |
Applications
| Automotive Body Control Module (BCM) Auxiliary Supply | Industrial PLC Isolated I/O Power |
|---|---|
Use Scenario: Powers 3.3V microcontroller and CAN transceiver from 12V battery in BCM, surviving cold-crank (3V) and load-dump (42V) events. IC Role / Device Role / Timing Role: Primary-side regulated isolated flyback controller providing galvanically separated 5V/3.3V rails. Use Value: Eliminates opto-isolator and third winding-reducing footprint by 35% and improving long-term reliability over 15-year vehicle life. | Use Scenario: Supplies isolated 5V rail for digital I/O channels in DIN-rail mounted PLC, operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: Micropower flyback controller with boundary mode for stable regulation under varying load (10mA–2A). Use Value: 106µA sleep current enables energy harvesting compatibility; AEC-Q100 H-grade ensures field longevity in harsh industrial environments. |
| Medical Patient Monitor Housekeeping Supply | EV Onboard Charger Auxiliary Bias Supply |
Use Scenario: Generates isolated 5V/3.3V for microcontroller and sensor interface in Class II medical equipment requiring 4kV reinforced isolation. IC Role / Device Role / Timing Role: No-opto flyback controller enabling compact, certified isolation without optocoupler lifetime derating. Use Value: Boundary mode operation ensures <±2% load regulation across 0–100% load-meeting IEC 60601-1 ripple and stability requirements. | Use Scenario: Provides bias supply for gate drivers and MCU in 6.6kW OBC, operating from 200–450V DC-link via auxiliary buck-fed input. IC Role / Device Role / Timing Role: High-voltage input flyback controller supporting 42V max input after pre-regulation stage. Use Value: 65V switch rating and 150°C junction rating allow direct integration near high-power stages without heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMS#TRPBF | Requires external MOSFET; no integrated switch; supports higher input (100V) and output power (30W+). | Better suited for >20W designs or where discrete FET selection is needed for thermal layout optimization. | Select LT3748 when higher power or custom switch optimization is required; LT8302HS8E-3#TRPBF preferred for compact ≤18W AEC-Q100-compliant designs. |
| UCC28740DR | TI part with integrated 600V FET; uses different primary-sensing algorithm; not AEC-Q100 qualified. | Targets consumer/industrial flyback; lacks automotive temp grade and EN/UVLO precision (±5% vs ±3%). | Choose UCC28740 for cost-sensitive non-automotive applications; LT8302HS8E-3#TRPBF required for automotive-grade reliability and accuracy. |
Compared with LT3748EMS#TRPBF and UCC28740DR, LT8302HS8E-3#TRPBF delivers the only AEC-Q100 Grade H qualified, fully integrated 65V flyback controller with 106µA sleep current and 1.214V ±3% EN threshold-making it uniquely suitable for space-constrained, safety-critical automotive auxiliary supplies.
Availability
LT8302HS8E-3#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLCs, medical patient monitors, and EV onboard charger auxiliary supplies requiring stable component supply across extended temperature and long lifecycle.
Supply support for LT8302HS8E-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 power management semiconductors, serving automotive, industrial, and medical markets with precision, reliability, and signal integrity.
The LT8302 product line delivers micropower isolated flyback controllers optimized for AEC-Q100-compliant auxiliary power in space- and efficiency-constrained automotive ECUs-emphasizing no-opto simplicity, wide input range, and thermal robustness.
FAQ
What is the maximum continuous output power achievable with LT8302HS8E-3#TRPBF?
The LT8302HS8E-3#TRPBF delivers up to 18W of isolated output power under typical conditions (e.g., 5V/3.6A or 12V/1.5A), constrained by its 3.6A/65V integrated switch and thermal limits in the S8E package. Actual power depends on transformer turns ratio, layout, and ambient temperature-maximum validated output is 15.3W at 32V input with 3:1 winding ratio per Analog Devices' Figure 1.
Does LT8302HS8E-3#TRPBF require an opto-isolator or third transformer winding?
No, the LT8302HS8E-3#TRPBF does not require an opto-isolator or third transformer winding. It regulates the isolated output voltage by sampling the primary-side flyback waveform at the SW pin during boundary conduction mode-enabling full regulation with only two external resistors (RFB and RREF) and eliminating opto aging, nonlinearity, and extra winding costs.
What is the purpose of the TC pin on LT8302HS8E-3#TRPBF?
The TC pin on LT8302HS8E-3#TRPBF outputs 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's forward voltage. Connecting an RTC resistor between TC and RREF injects PTAT current to counteract VF drift-critical for maintaining ±2% regulation on 5V/3.3V outputs across –40°C to 150°C.
How does LT8302HS8E-3#TRPBF differ from LT8302HS8E#TRPBF?
The LT8302HS8E-3#TRPBF uses voltage-level-based boundary detection on the RREF pin, whereas LT8302HS8E#TRPBF uses dv/dt slope detection. This makes the -3 variant less sensitive to noise on RREF-especially beneficial in multi-output or high-noise automotive environments-while maintaining identical pinout, specs, and AEC-Q100 Grade H qualification.
Is LT8302HS8E-3#TRPBF compatible with standard 8-lead SO PCB footprints?
Yes, LT8302HS8E-3#TRPBF uses the industry-standard 8-lead plastic SO (S8E) package with 1.27mm pitch and exposed thermal pad (Pin 9). It shares the same mechanical dimensions and soldering profile as LT8302ES8E#TRPBF and other S8E variants-requiring no PCB redesign when upgrading from commercial to automotive-grade versions.
LT8302HS8E-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8302HS8E-3#TRPBF FAQ
1.How can I place an order for LT8302HS8E-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302HS8E-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 LT8302HS8E-3#TRPBF reliable?
The price and inventory of LT8302HS8E-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 LT8302HS8E-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8302HS8E-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302HS8E-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302HS8E-3#TRPBF?
LT8302HS8E-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302HS8E-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 LT8302HS8E-3#TRPBF?
For technical support, including LT8302HS8E-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302HS8E-3#TRPBF requirements.
6.How does Aetrix verify that LT8302HS8E-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8302HS8E-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 LT8302HS8E-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8302HS8E-3#TRPBF?
All LT8302HS8E-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302HS8E-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 LT8302HS8E-3#TRPBF part is unused and in its original packaging.
Return procedure for LT8302HS8E-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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