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Analog Devices Inc. LT8302IS8E#TRPBF
- Part No.:
- LT8302IS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302IS8E#TRPBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,948
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Product details
Overview
LT8302IS8E#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 by sampling the primary-side flyback waveform in boundary mode, enabling compact auxiliary power supplies in automotive and industrial systems.
For engineers reviewing the LT8302IS8E#TRPBF datasheet, LT8302IS8E#TRPBF pinout, LT8302IS8E#TRPBF application, or LT8302IS8E#TRPBF equivalent, key selection criteria include its 106µA sleep-mode quiescent current, quasi-resonant boundary mode operation, low-ripple Burst Mode® at light load, internal 1.00V reference, and AEC-Q100 qualification for automotive use.
Technical Context
The LT8302IS8E#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 intervals. Its boundary mode detector triggers switch turn-on at the SW pin valley, enabling high efficiency and excellent load regulation without external compensation.
It supports three operational modes: quasi-resonant boundary conduction mode at heavy load (variable frequency, variable peak current), discontinuous conduction mode under medium load (frequency clamped ≤380kHz), and low-ripple Burst Mode® at light load (12kHz minimum switching frequency, sleep/active cycling) to maintain <0.5% minimum load requirement and high light-load efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-input industrial and automotive battery rails including cold-crank and load-dump conditions. |
| Integrated Switch | 65V/3.6A DMOS - eliminates need for external high-voltage switch; RDS(ON) = 80mΩ ensures low conduction loss at full load. |
| Quiescent Current | 106µA in Sleep Mode - enables ultra-low standby power for always-on isolated housekeeping supplies. |
| Output Regulation | No opto-isolator or third winding required - reduces BOM count, cost, and PCB area while improving reliability over optocoupler-based designs. |
| Operating Modes | Boundary mode (heavy load), DCM (medium load), low-ripple Burst Mode® (light load) - dynamically optimizes efficiency across 0.5%–100% load range. |
| Temperature Range | –40°C to +125°C junction - qualified per AEC-Q100 Grade I, suitable for under-hood automotive auxiliary power. |
| Package | 8-Lead Plastic SO with exposed pad - thermally enhanced θJA = 33°C/W; exposed pad must be soldered to PCB ground for thermal and electrical integrity. |
Pinout & Package
LT8302IS8E#TRPBF is housed in an 8-lead plastic SO package (S8E) with exposed pad (Pin 9, GND). The exposed pad provides both thermal dissipation and low-inductance ground connection and must be soldered directly to the PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | Accurate 1.214V enable threshold with 14mV hysteresis; enables programmable VIN UVLO using resistor divider; pulls below 0.3V to shut down device. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Supplies internal control circuitry and gate driver; requires ≥1µF ceramic bypass to GND; must not be externally driven. |
| VIN (Pin 3) | Main Input Supply | Primary power source for internal circuitry and feedback reference; requires local bulk and ceramic bypass capacitors. |
| GND (Pin 4 & Exposed Pad Pin 9) | Ground Reference | Common return for all internal circuits; exposed pad is electrically and thermally connected to GND and must be soldered to PCB ground plane. |
| SW (Pin 5) | Drain of Integrated DMOS Switch | Connects to transformer primary; high dv/dt node requiring minimized trace area to reduce EMI and voltage spikes. |
| RFB (Pin 6) | Feedback Resistor Input | Connects to transformer primary SW node; forms voltage divider with RREF to set output voltage via VREF × RFB/RREF. |
| RREF (Pin 7) | Reference Resistor Input | Ground-referenced node for RREF resistor; internal 1.00V reference ensures precise output programming; nominal value 10kΩ. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (3.35mV/K, 1.00V at 25°C); used with RTC resistor to compensate output diode forward voltage drift over temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Opto-free isolation | Eliminates opto-isolator and third winding - reduces component count, cost, and long-term drift issues inherent in optocouplers. |
| Low-ripple Burst Mode® | Maintains <15mVPP output ripple at light load while achieving >80% efficiency at 10mA - critical for noise-sensitive analog and communication circuits. |
| Internal soft-start | 11ms built-in soft-start timer - prevents inrush current and output overshoot during startup without external components. |
| Output short-circuit protection | Auto-recovery protection with foldback current limiting - sustains safe operation during sustained short-circuit events without latch-up or thermal shutdown. |
| Temperature-compensated regulation | TC pin enables ±0.5% output voltage stability over –40°C to +125°C for 5V outputs - compensates diode VF drift without external sensors or calibration. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Sensors |
|---|---|
Use Scenario: Providing isolated 5V/1A housekeeping power for CAN transceivers, microcontrollers, and ADCs in engine control units (ECUs) and body control modules (BCMs). IC Role / Device Role / Timing Role: Primary-side isolated flyback controller regulating output voltage via primary-side sampling, eliminating opto-isolator dependency. Use Value: Enables AEC-Q100-compliant, compact, and reliable auxiliary supply with <0.5% minimum load and 106µA sleep current for always-on diagnostics. | Use Scenario: Generating isolated 3.3V/500mA power for fieldbus interface ICs (e.g., RS-485, Profibus) in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Micropower flyback controller delivering stable isolated rail in space-constrained DIN-rail mounted enclosures with wide input (12–36VDC). Use Value: Achieves >85% efficiency across 10mA–1A load range and withstands 42V transients, reducing thermal design burden and system footprint. |
| Medical Patient Monitoring | Smart Grid Meters |
Use Scenario: Supplying isolated 5V power to isolated data acquisition front-ends (e.g., EEG, ECG amplifiers) in portable patient monitors requiring reinforced isolation and low EMI. IC Role / Device Role / Timing Role: Boundary-mode flyback controller ensuring precise output regulation without secondary-side feedback components. Use Value: Delivers <15mVPP ripple in Burst Mode® and meets IEC 60601 creepage/clearance requirements via transformer-only isolation. | Use Scenario: Powering isolated metrology ASICs and real-time clocks in ANSI C12.20-compliant smart electricity meters with 120/240VAC input via offline DC bus. IC Role / Device Role / Timing Role: High-voltage input flyback controller converting 12–42VDC intermediate bus to isolated 3.3V for metrology subsystems. Use Value: Supports 18W output with 3V–42V input range and AEC-Q100-grade reliability for 15+ year field life in harsh outdoor environments. |
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; higher IQ (250µA active); supports up to 100V input. | Better suited for >65V input or higher-power (>25W) isolated supplies where discrete FET optimization is needed. | Select LT3748 when input exceeds 42V or when thermal management requires separation of switch and controller. |
| UCC28740DR | TI part with integrated 700V FET; higher VDS rating; uses different primary-sensing architecture; no TC pin for diode temp compensation. | Targeted at universal AC input (85–265VAC) offline flyback; lacks AEC-Q100 qualification and precise 1.00V reference. | Choose UCC28740 for AC/DC adapter-style designs; avoid for automotive or precision 5V/3.3V isolated rails requiring tight temp stability. |
Compared with LT3748EMS#TRPBF and UCC28740DR, the LT8302IS8E#TRPBF offers the only combination of integrated 65V/3.6A switch, 106µA sleep current, AEC-Q100 qualification, and on-chip temperature compensation - making it optimal for compact, low-power, automotive-grade isolated auxiliary supplies.
Availability
LT8302IS8E#TRPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial sensor interfaces, medical monitoring subsystems, and smart grid metering requiring stable component supply, long lifecycle support, and AEC-Q100 compliance.
Supply support for LT8302IS8E#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 industrial, automotive, communications, and healthcare markets.
The LT8302 product line delivers micropower isolated flyback controllers optimized for compact, opto-free, AEC-Q100-qualified auxiliary power in harsh environments - targeting automotive infotainment, ADAS domain controllers, and industrial IoT edge nodes.
FAQ
What is the maximum output power achievable with the LT8302IS8E#TRPBF?
The LT8302IS8E#TRPBF delivers up to 18W of isolated output power, depending on input voltage, transformer turns ratio, and output voltage. At VIN = 24V and VOUT = 5V with a 3:1 turns ratio, typical output capability is 2.9A (14.5W); at VIN = 32V, it reaches ~18W. Power is limited by the 3.6A switch current and 65V SW pin rating, with 15V margin reserved for leakage inductance spikes.
Does the LT8302IS8E#TRPBF require an opto-isolator or third transformer winding?
No, the LT8302IS8E#TRPBF does not require an opto-isolator or third transformer winding. It regulates output voltage by sampling the isolated output via the primary-side flyback waveform at the SW pin during zero-secondary-current intervals - a core feature enabling simplified, reliable, and compact isolated power designs.
How does the TC pin on the LT8302IS8E#TRPBF improve output voltage accuracy?
The TC pin on the LT8302IS8E#TRPBF provides a PTAT voltage (3.35mV/K, 1.00V at 25°C) used with an external RTC resistor to inject temperature-dependent current into the RREF node. This compensates for the negative temperature coefficient of the output diode's forward voltage (–1 to –2mV/°C), maintaining ±0.5% output stability over –40°C to +125°C for 5V outputs.
What are the key differences between LT8302 and LT8302-3 variants?
The LT8302IS8E#TRPBF is the standard LT8302 variant (not -3). The difference lies in boundary detection: LT8302 uses dv/dt sensing on the RREF pin, while LT8302-3 uses voltage-level sensing. LT8302-3 is recommended for multi-output transformers with higher RREF noise susceptibility; LT8302 performs identically with low-leakage-inductance transformers and is preferred for single-output 5V/3.3V auxiliary rails.
Is the LT8302IS8E#TRPBF qualified for automotive applications?
Yes, the LT8302IS8E#TRPBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to +125°C junction temperature). It is specifically designed for isolated auxiliary/housekeeping power in ECUs, ADAS cameras, infotainment systems, and gateway modules where reliability, low quiescent current, and opto-free operation are critical.
LT8302IS8E#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
LT8302IS8E#TRPBF FAQ
1.How can I place an order for LT8302IS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302IS8E#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#TRPBF reliable?
The price and inventory of LT8302IS8E#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8302IS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302IS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302IS8E#TRPBF?
LT8302IS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302IS8E#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#TRPBF?
For technical support, including LT8302IS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302IS8E#TRPBF requirements.
6.How does Aetrix verify that LT8302IS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8302IS8E#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8302IS8E#TRPBF?
All LT8302IS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302IS8E#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#TRPBF part is unused and in its original packaging.
Return procedure for LT8302IS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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