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Analog Devices Inc. LT8302HS8E#TRPBF
- Part No.:
- LT8302HS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302HS8E#TRPBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,747
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Product details
Overview
LT8302HS8E#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 automotive auxiliary power supplies.
For engineers reviewing the LT8302HS8E#TRPBF datasheet, LT8302HS8E#TRPBF pinout, LT8302HS8E#TRPBF application, or LT8302HS8E#TRPBF equivalent, key selection considerations include its AEC-Q100 qualification, –40°C to 150°C junction temperature rating, 106µA sleep-mode quiescent current, 3.6A/65V internal switch, and no-opto isolated regulation architecture.
Technical Context
The LT8302HS8E#TRPBF implements quasi-resonant boundary conduction mode at heavy loads-sensing zero secondary current via SW pin valley detection-to achieve excellent load regulation and enable compact magnetics. Its sample-and-hold error amplifier directly measures isolated output voltage from the primary-side flyback pulse, eliminating need for optocouplers or auxiliary windings.
At light loads, it transitions to low-ripple Burst Mode® operation with 12kHz minimum switching frequency, maintaining high efficiency while limiting output voltage ripple. Internal compensation, soft-start, EN/UVLO with 1.214V threshold and 14mV hysteresis, and temperature-compensated feedback (via TC pin) are fully integrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide industrial and automotive battery inputs including cold-crank and load-dump conditions. |
| Output Power | Up to 18W - enables isolated housekeeping rails for ECUs, sensors, and gate drivers without external power stages. |
| Internal Switch | 65V/3.6A DMOS - integrates high-voltage switching capability; 80mΩ RDS(ON) minimizes conduction loss in compact SO-8 package. |
| Quiescent Current | 106µA in Sleep Mode - extends battery life in always-on automotive systems with standby functionality. |
| Junction Temp Range | –40°C to 150°C - qualified per AEC-Q100 Grade H, enabling under-hood deployment without derating. |
| Regulation Method | No-opto primary-side sensing - eliminates optocoupler aging, nonlinearity, and layout sensitivity; reduces BOM count and footprint. |
| Switching Modes | Boundary mode (heavy load), discontinuous mode (mid-load), low-ripple Burst Mode® (light load) - optimizes efficiency across full load range. |
Pinout & Package
LT8302HS8E#TRPBF is housed in an 8-lead plastic SO package (S8E) with exposed thermal pad (Pin 9) soldered to PCB ground for enhanced thermal performance (θJA = 33°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input Undervoltage Lockout | Accurate 1.214V enable threshold with 14mV hysteresis; allows programmable VIN UVLO using resistor divider. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal control circuitry; requires ≥1µF local ceramic bypass to GND; must not be externally driven. |
| VIN (Pin 3) | Main Input Supply | Supplies internal circuitry and serves as reference for RFB feedback network; requires local bulk + ceramic bypassing. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power & Signal Ground | Common return for all circuits; exposed pad provides critical thermal path to PCB ground plane. |
| SW (Pin 5) | Drain of Internal DMOS Switch | Connects to transformer primary; high dv/dt node requiring minimized trace area to reduce EMI and voltage spikes. |
| RFB (Pin 6) | Feedback Input from Flyback Pulse | Samples isolated output voltage via primary-side flyback waveform; connects to SW node through external resistor. |
| RREF (Pin 7) | Reference Resistor Terminal | Ground-referred node where RREF sets feedback gain; internal 1.00V reference enables precise VOUT programming. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (3.35mV/°K) used to offset output diode forward voltage drift; enables ±1% output tempco over –40°C to 125°C. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates optocoupler and third winding - reduces component count, cost, and long-term reliability risk from opto aging. |
| Integrated 65V/3.6A DMOS switch | Enables complete isolated flyback solution in single SO-8 package; 80mΩ RDS(ON) supports high-efficiency 18W designs. |
| AEC-Q100 Grade H qualification | Validated for automotive under-hood use up to 150°C junction temperature - meets stringent automotive reliability requirements. |
| Low-ripple Burst Mode® | Maintains <15mVPP output ripple at light loads while achieving >85% efficiency down to 1% load - ideal for always-on sensor rails. |
| Internal soft-start and compensation | Removes need for external compensation components and start-up timing networks - simplifies design and improves consistency. |
Applications
| Automotive Body Control Module (BCM) Auxiliary Supply | Industrial PLC Isolated I/O Power |
|---|---|
Use Scenario: Provides isolated 5V/1.5A auxiliary rail for microcontroller, CAN transceiver, and sensor interface in BCM units exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller managing isolation barrier, voltage setpoint, and thermal-safe operation. Use Value: Eliminates optocoupler and third winding - reduces board space by 35% and improves long-term stability versus aging-based drift in opto-based solutions. | Use Scenario: Generates isolated 3.3V/1A supply for digital I/O modules in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Micropower isolated DC-DC controller delivering stable rail with minimal standby consumption during I/O sleep cycles. Use Value: 106µA sleep-mode IQ enables >10-year battery backup for configuration memory; AEC-Q100 H-grade ensures 15-year field life at 125°C ambient. |
| Medical Patient Monitoring Sensor Interface | EV Onboard Charger Auxiliary Bias Supply |
Use Scenario: Supplies isolated 5V rail to analog front-end and ADC in portable patient monitors requiring reinforced insulation per IEC 60601-1. IC Role / Device Role / Timing Role: Safety-certified isolated power controller meeting creepage/clearance requirements via transformer-only isolation. Use Value: No optocoupler removes failure mode affecting safety certification; boundary mode ensures tight load regulation (<±2%) across 10mA–1.2A range. | Use Scenario: Delivers 12V/0.8A isolated bias supply for gate drivers and MCU in high-voltage onboard chargers (OBC) with 400V–800V DC-link. IC Role / Device Role / Timing Role: High-input-voltage flyback controller regulating auxiliary rail from OBC's intermediate bus. Use Value: 42V max VIN withstands transient overvoltages on intermediate bus; 150°C junction rating supports placement near power stage without heatsink. |
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#TRPBF | Higher 100V/4.5A switch, 20W capability, same pinout and control architecture. | Supports higher input transients (e.g., 60V load dump) and greater output power; requires larger magnetics. | Select when input may exceed 42V or >18W output is required; drop-in compatible with layout reuse. |
| UCC28740DR | TI PSR controller with 700V MOSFET, no integrated switch; 105µA IQ, but no AEC-Q100 qualification. | Targets universal AC input (85–265VAC); lacks automotive temp grade and integrated high-current switch. | Choose for AC/DC offline applications; avoid for automotive or high-reliability isolated DC-DC where AEC-Q100 and integrated switch are mandatory. |
Compared with LT8304HS8E#TRPBF, LT8302HS8E#TRPBF offers lower cost and smaller solution size for ≤18W automotive auxiliary rails, while UCC28740DR requires external MOSFET and lacks AEC-Q100 support-making LT8302HS8E#TRPBF the optimal choice for thermally constrained, safety-critical DC-DC isolation in vehicles and industrial equipment.
Availability
LT8302HS8E#TRPBF is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, and medical sensor interfaces requiring stable component supply, AEC-Q100 compliance, and extended temperature operation.
Supply support for LT8302HS8E#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 product line delivers micropower isolated flyback controllers optimized for AEC-Q100-compliant automotive auxiliary power, eliminating optocouplers while maintaining tight regulation and robust thermal performance.
FAQ
What is the maximum output power achievable with LT8302HS8E#TRPBF?
The LT8302HS8E#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 selection. Maximum power depends on input voltage, output voltage, transformer turns ratio, and thermal management-e.g., 15.3W at 32V input with 5V/3A output and 3:1 turns ratio. Derating is required above 125°C ambient.
Does LT8302HS8E#TRPBF require an optocoupler or third transformer winding?
No, LT8302HS8E#TRPBF does not require an optocoupler or third transformer winding. It uses primary-side flyback waveform sampling via the RFB pin to regulate the isolated output voltage. This architecture eliminates optocoupler aging, nonlinearities, and layout sensitivity while reducing BOM count and improving long-term reliability.
What is the operating temperature range for LT8302HS8E#TRPBF?
The LT8302HS8E#TRPBF is rated for a junction temperature range of –40°C to 150°C and is qualified per AEC-Q100 Grade H. This makes it suitable for under-hood automotive applications and other high-temperature industrial environments where extended thermal performance is critical.
How does LT8302HS8E#TRPBF manage light-load efficiency?
LT8302HS8E#TRPBF uses low-ripple Burst Mode® operation at light loads, alternating between active and sleep modes to maintain high efficiency while minimizing output voltage ripple. Its 106µA sleep-mode quiescent current and 12kHz minimum switching frequency ensure stable regulation down to 0.5% of full load without audible noise or excessive ripple.
Can LT8302HS8E#TRPBF support temperature compensation of the output voltage?
Yes, LT8302HS8E#TRPBF supports output voltage temperature compensation via the TC pin, which provides a PTAT voltage (3.35mV/°K). Connecting an external resistor (RTC) between TC and RREF injects a compensating current that offsets the negative temperature coefficient of the output diode, enabling ±1% output regulation over –40°C to 125°C.
LT8302HS8E#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8302HS8E#TRPBF FAQ
1.How can I place an order for LT8302HS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302HS8E#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#TRPBF reliable?
The price and inventory of LT8302HS8E#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8302HS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302HS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302HS8E#TRPBF?
LT8302HS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302HS8E#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#TRPBF?
For technical support, including LT8302HS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302HS8E#TRPBF requirements.
6.How does Aetrix verify that LT8302HS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8302HS8E#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8302HS8E#TRPBF?
All LT8302HS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302HS8E#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#TRPBF part is unused and in its original packaging.
Return procedure for LT8302HS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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