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Analog Devices Inc. LT8302HS8E#PBF
- Part No.:
- LT8302HS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302HS8E#PBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,415
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Product details
Overview
LT8302HS8E#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 in thermally enhanced 8-lead SO package. It regulates output voltage without opto-isolator or third transformer winding using primary-side flyback waveform sampling, supports boundary mode at heavy load and low-ripple Burst Mode® at light load, and is AEC-Q100 qualified for automotive applications.
For engineers reviewing the LT8302HS8E#PBF datasheet, LT8302HS8E#PBF pinout, LT8302HS8E#PBF application, or LT8302HS8E#PBF equivalent, key selection considerations include its 106µA sleep-mode quiescent current, ±1.0% RREF reference accuracy, 12kHz minimum switching frequency, 160ns minimum on-time, and thermal grade (–40°C to 150°C junction).
Technical Context
The LT8302HS8E#PBF implements quasi-resonant boundary conduction mode at heavy load-sensing zero secondary current via SW pin valley detection-to achieve excellent load regulation and enable compact magnetics. Its sample-and-hold error amplifier samples the flyback pulse amplitude during zero-current intervals, eliminating need for opto-isolators or auxiliary windings.
At light loads, it transitions to low-ripple Burst Mode® operation, alternating between active and sleep modes to maintain high efficiency while holding output voltage ripple below 50mV. Internal compensation, soft-start, EN/UVLO with 1.214V threshold and 14mV hysteresis, and temperature-compensated output diode support ensure stable, robust isolated power delivery across automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-input automotive and industrial rails without external pre-regulation |
| Switch Rating | 65V/3.6A DMOS - enables 18W isolated output with margin for leakage spikes up to 50V |
| Quiescent Current | 106µA sleep mode - extends battery life in always-on auxiliary supplies |
| RREF Reference | 1.00V ±2% - sets output voltage accuracy independent of VIN line variation |
| Min Switch Freq | 12kHz - ensures reliable output voltage sampling and defines minimum load (~0.5% full scale) |
| Thermal Grade | –40°C to 150°C junction - qualified per AEC-Q100 for under-hood automotive use |
| Package | 8-Lead SO with exposed GND pad - θJA = 33°C/W enables high-power density without heatsink |
Pinout & Package
LT8302HS8E#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 integrity. Package outline matches standard SO-8 (S8E) footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input UVLO input | 1.214V threshold with 14mV hysteresis - enables programmable VIN lockout or direct tie-to-VIN for always-on operation |
| INTVCC (Pin 2) | Internal 3V LDO output | Powers internal logic and gate driver; requires ≥1µF local ceramic bypass to GND |
| VIN (Pin 3) | Main input supply rail | Supplies control circuitry and serves as reference for RFB feedback network |
| GND (Pin 4 + Exposed Pad Pin 9) | Power and signal ground | Exposed pad must be soldered to PCB ground plane 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 overshoot |
| RFB (Pin 6) | Feedback current input | Samples flyback pulse amplitude; connects to SW node via resistor to set output voltage ratio |
| RREF (Pin 7) | Reference resistor terminal | Ground-referred node for RREF (≈10kΩ); voltage held at 1.00V by internal regulator |
| TC (Pin 8) | Temperature compensation output | PTAT voltage (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, cost, and board space while eliminating opto aging and nonlinearity issues |
| Boundary mode + low-ripple Burst Mode® | Enables <0.5% minimum load and maintains <50mV output ripple across 10mA–2.9A range |
| Integrated 65V/3.6A DMOS switch | Eliminates external MOSFET and driver, simplifying layout and improving reliability |
| Internal compensation & soft-start | Reduces external components to just RFB, RREF, RTC, transformer, and output capacitor |
| AEC-Q100 qualified (H-grade) | Validated for automotive under-hood operation up to 150°C junction temperature |
Applications
| Automotive Auxiliary Power | Industrial Isolated Bias Supply |
|---|---|
Use Scenario: Providing isolated 5V/1.1A housekeeping power to ADAS camera modules from 12V battery rail with cold-crank tolerance down to 3V. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating output via sampled SW node waveform, eliminating need for optocoupler feedback loop. Use Value: Enables compact, AEC-Q100-compliant 5V bias rail with 106µA sleep current for always-on vision systems. | Use Scenario: Generating isolated 12V/1.5A auxiliary supply for PLC I/O modules operating from 24V DC field bus with EMI-sensitive analog front-ends. IC Role / Device Role / Timing Role: Micropower flyback controller implementing boundary mode for tight load regulation and low-ripple Burst Mode® for <50mV output noise at light loads. Use Value: Delivers stable 12V output with ±1% accuracy over –40°C to 85°C ambient, supporting precision sensor excitation. |
| Medical Patient Monitoring | Isolated Gate Driver Supply |
Use Scenario: Powering isolated 3.3V logic and analog sections in portable ECG devices requiring reinforced isolation and low standby power. IC Role / Device Role / Timing Role: Isolated flyback controller with primary-side sensing and temperature-compensated output to maintain 3.3V accuracy across body-temperature range. Use Value: Achieves <0.5% output drift from 0°C to 50°C using TC pin and RTC resistor, meeting IEC 60601 creepage requirements. | Use Scenario: Delivering isolated 15V/0.5A gate drive supply for SiC MOSFET half-bridge inverters in motor drives, where fast transient response and low noise are critical. IC Role / Device Role / Timing Role: High-voltage flyback controller with 65V switch rating and 160ns minimum on-time enabling precise gate charge delivery. Use Value: Supports 15V gate drive with <2% regulation error across 100kHz–380kHz variable-frequency operation, minimizing shoot-through risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8304HS8E#PBF | Higher 100V switch rating, 4.5A peak current, same 8-SO package and pinout | Supports >42V input (e.g., 48V telecom, 60V industrial) and higher output power (>25W) | Select when input exceeds 42V or output power >18W is required; otherwise LT8302HS8E#PBF offers lower cost and identical feature set |
| UCC28911DR | 65V/1.2A switch, no TC pin, fixed 120kHz frequency, no boundary mode | Lacks temperature compensation and quasi-resonant operation; lower output current capability | Choose for cost-sensitive, non-automotive designs where ±3% output accuracy and 1.2A max load suffice |
Compared with LT8304HS8E#PBF, LT8302HS8E#PBF provides optimal balance of 42V input support, 18W capability, and AEC-Q100 qualification; versus UCC28911DR, it delivers superior light-load efficiency, tighter output regulation, and automotive-grade thermal performance.
Availability
LT8302HS8E#PBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial isolated bias supplies, and medical patient monitoring systems requiring stable component supply with long-term lifecycle assurance.
Supply support for LT8302HS8E#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 automotive, industrial, communications, and healthcare markets.
The LT8302 product line delivers micropower isolated flyback controllers optimized for AEC-Q100-compliant automotive auxiliary supplies and compact industrial isolated bias rails-designed to eliminate opto-isolators while maintaining ±1% output accuracy and ultra-low quiescent current.
FAQ
What is the maximum output power achievable with LT8302HS8E#PBF?
The LT8302HS8E#PBF delivers up to 18W of isolated output power. This is achieved with a 65V/3.6A integrated DMOS switch, 3V–42V input range, and boundary mode operation enabling efficient energy transfer. Maximum power depends on transformer turns ratio, input voltage, and thermal management-e.g., 5V/2.9A at 24VIN or 12V/1.5A at 12VIN. Derating applies above 125°C junction temperature.
Does LT8302HS8E#PBF require an opto-isolator or third transformer winding?
No, the LT8302HS8E#PBF does not require an opto-isolator or third transformer winding. It regulates output voltage by sampling the isolated flyback pulse directly from the primary-side SW pin waveform during zero-secondary-current intervals. This primary-side sensing architecture eliminates opto aging, nonlinearity, and extra winding costs while maintaining ±1% output accuracy.
What is the purpose of the TC pin on LT8302HS8E#PBF?
On the LT8302HS8E#PBF, the TC (Temperature Compensation) pin outputs a PTAT voltage (1V at 25°C, 3.35mV/K) used to compensate for the negative temperature coefficient of the output diode's forward voltage (VF). By connecting an RTC resistor between TC and RREF pins, the LT8302HS8E#PBF cancels VF drift-reducing output voltage variation from ±300mV to <±25mV across –40°C to 125°C for 5V outputs.
How does LT8302HS8E#PBF manage light-load efficiency?
The LT8302HS8E#PBF maintains high light-load efficiency via low-ripple Burst Mode® operation: it alternates between active switching cycles and deep sleep mode (106µA IQ), sampling the output voltage at a minimum 12kHz rate. This reduces effective quiescent current while limiting output voltage ripple to <50mV-even at loads as low as 10mA-without requiring external control circuitry.
What is the difference between LT8302HS8E#PBF and LT8302HS8E-3#PBF?
The LT8302HS8E#PBF uses dv/dt-based boundary detection on the RREF pin, while the LT8302HS8E-3#PBF uses voltage-level detection. The -3 variant offers lower noise sensitivity on RREF, making it preferred for multi-output transformers with higher leakage inductance. Both share identical pinout, specs, and thermal grade; only boundary detection method differs-no changes to RFB/RREF/RTC design equations.
LT8302HS8E#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8302HS8E#PBF FAQ
1.How can I place an order for LT8302HS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302HS8E#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 LT8302HS8E#PBF reliable?
The price and inventory of LT8302HS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8302HS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT8302HS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302HS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302HS8E#PBF?
LT8302HS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302HS8E#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 LT8302HS8E#PBF?
For technical support, including LT8302HS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302HS8E#PBF requirements.
6.How does Aetrix verify that LT8302HS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8302HS8E#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 LT8302HS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT8302HS8E#PBF?
All LT8302HS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302HS8E#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 LT8302HS8E#PBF part is unused and in its original packaging.
Return procedure for LT8302HS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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