My Inquiry
My Account
Analog Devices Inc. LT8302IS8E#WTRPBF
- Part No.:
- LT8302IS8E#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302IS8E#WTRPBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8302IS8E#WTRPBF 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 heavy-load efficiency and low-ripple Burst Mode® for light-load operation, and is AEC-Q100 qualified for automotive auxiliary power supplies.
For engineers reviewing the LT8302IS8E#WTRPBF datasheet, LT8302IS8E#WTRPBF pinout, LT8302IS8E#WTRPBF application, or LT8302IS8E#WTRPBF equivalent, key selection criteria include input voltage range (3–42V), internal switch rating (65V/3.6A), quiescent current (106µA sleep / 380µA active), boundary-mode operation, and automotive-grade thermal range (–40°C to 125°C).
Technical Context
The LT8302IS8E#WTRPBF 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 directly measures isolated output voltage from the primary-side flyback pulse, eliminating need for opto-isolators or auxiliary windings.
At light load, it transitions to low-ripple Burst Mode® with minimum 12kHz switching frequency, maintaining high efficiency while limiting output voltage ripple; internal soft-start, temperature-compensated feedback (via TC pin), and accurate EN/UVLO with 14mV hysteresis support robust startup and fault protection in automotive and industrial environments.
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) |
| Integrated Switch | 65V/3.6A DMOS - enables 18W isolated output with margin for leakage inductance spikes |
| Quiescent Current | 106µA (sleep) / 380µA (active) - ensures micropower operation for always-on auxiliary rails |
| Switching Modes | Boundary mode (heavy load) + Low-ripple Burst Mode® (light load) - balances efficiency across full load range |
| Output Regulation | No opto-isolator or third winding required - simplifies design, reduces BOM cost, improves reliability vs optocoupler aging |
| Temperature Range | –40°C to 125°C junction - AEC-Q100 qualified for under-hood automotive applications |
| Package | 8-Lead SO with exposed GND pad - thermally enhanced for high-power density in constrained layouts |
Pinout & Package
LT8302IS8E#WTRPBF is housed in an 8-lead plastic SO package (S8E) with exposed pad (Pin 9) electrically and thermally connected to GND. The exposed pad must be soldered to PCB ground plane for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input Undervoltage Lockout | Accurate 1.214V enable threshold with 14mV hysteresis; enables 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 capacitance |
| GND (Pin 4 & Exposed Pad Pin 9) | Power and Signal Ground | Common return for all internal blocks; exposed pad provides critical thermal path to PCB ground plane |
| SW (Pin 5) | Drain of Internal Power Switch | Connects to transformer primary; high dv/dt node requiring minimized trace area to reduce EMI and voltage overshoot |
| RFB (Pin 6) | Feedback Input from Flyback Pulse | Samples isolated output voltage via primary-side flyback waveform; determines VOUT via RFB/RREF ratio |
| RREF (Pin 7) | Reference Resistor Terminal | Ground-referenced node for RREF (typically 10kΩ); sets internal 1.00V reference gain path for output regulation |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1V at 25°C, 3.35mV/K); enables compensation of output diode forward-voltage drift across temperature |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side sensing architecture | Eliminates opto-isolator and third winding - reduces component count, cost, and long-term drift issues |
| Low-ripple Burst Mode® | Maintains <1% output ripple at light loads while achieving >80% efficiency down to 0.5% full-load |
| Boundary conduction mode | Enables zero-current switching at SW valley - improves efficiency and allows smaller, lower-cost transformers |
| Integrated soft-start and compensation | Reduces external components; eliminates need for external loop compensation network or start-up timing circuits |
| AEC-Q100 qualification | Validated for automotive use - supports reliable operation in harsh environments with extended temperature and lifetime requirements |
Applications
| Automotive Auxiliary Power | Industrial Isolated Bias Supply |
|---|---|
Use Scenario: Providing isolated 5V/1A housekeeping power for ADAS camera modules in engine compartment. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller generating isolated output without optocoupler feedback. Use Value: Enables compact, AEC-Q100-compliant design with no optocoupler aging or temperature drift-critical for 15-year automotive service life. | Use Scenario: Generating isolated 3.3V/500mA supply for PLC I/O module microcontrollers and analog front-ends. IC Role / Device Role / Timing Role: Micropower isolated flyback controller supporting wide 9–36V DC input range typical of industrial 24V systems. Use Value: Delivers stable output across line and load variations while maintaining <106µA sleep current during standby-reducing system power budget. |
| Medical Sensor Interface Power | Isolated Communication Transceiver Bias |
Use Scenario: Powering isolated analog signal conditioning circuitry for patient-connected biosensors in portable monitors. IC Role / Device Role / Timing Role: Safety-isolated flyback controller meeting creepage/clearance requirements via transformer barrier. Use Value: Achieves <5mVpp output ripple in Burst Mode®-preserving SNR in precision sensor signal chains without secondary LDO post-regulation. | Use Scenario: Supplying isolated 5V bias for RS-485 or CAN transceivers in motor drive control boards. IC Role / Device Role / Timing Role: High-integration flyback controller delivering clean, regulated isolated rail with minimal external components. Use Value: Integrated 3.6A switch and boundary-mode operation allow single-layer transformer design-reducing board area and EMI filter complexity. |
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#WTRPBF | Lacks TC pin and temperature compensation; lower max switch current (2.5A vs 3.6A); same 8-lead SO package | Not suitable for precision low-voltage outputs (<5V) requiring diode tempco compensation | Select when output is ≥12V or temperature stability is less critical; lower cost alternative for non-automotive use |
| UCC28740DR | Texas Instruments PSR controller; higher max input (65V); no integrated TC compensation; different pinout and control architecture | Requires external compensation; lacks AEC-Q100 qualification; optimized for higher-power consumer adapters | Consider for cost-sensitive industrial designs where automotive qualification is unnecessary and layout flexibility permits new footprint |
Compared with LT8302IS8E#WTRPBF, LT8301IS8E#WTRPBF offers reduced integration and lower output power capability but shares identical package and automotive qualification, while UCC28740DR provides higher input voltage tolerance at the expense of missing temperature compensation and automotive compliance-making LT8302IS8E#WTRPBF optimal for AEC-Q100-compliant, precision low-voltage isolated supplies.
Availability
LT8302IS8E#WTRPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial isolated bias, and medical sensor interface applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8302IS8E#WTRPBF 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, automotive, and communications markets.
The LT8302 product line delivers micropower isolated flyback controllers with primary-side regulation, targeting space-constrained, reliability-critical applications such as automotive housekeeping supplies and industrial isolated bias rails.
FAQ
What is the maximum isolated output power achievable with LT8302IS8E#WTRPBF?
The LT8302IS8E#WTRPBF delivers up to 18W of isolated output power, validated across its 3V–42V input range with appropriate transformer design and layout. At 24V input, typical output is 5V/2.9A; at 12V input, 5V/2.0A; and at 5V input, 5V/1.1A. Power capability depends on transformer turns ratio, switching frequency, and thermal management-maximum switch voltage stress is limited to 50V for reliability, leaving 15V margin below the 65V rating.
Does LT8302IS8E#WTRPBF require an opto-isolator or third transformer winding for regulation?
No, the LT8302IS8E#WTRPBF does not require an opto-isolator or third transformer winding. It achieves precise isolated output regulation by sampling the flyback voltage waveform directly at the SW pin during zero-secondary-current intervals. This primary-side sensing architecture eliminates optocoupler aging, nonlinearities, and extra winding complexity-reducing BOM count and improving long-term stability in automotive and industrial applications.
What is the purpose of the TC pin on LT8302IS8E#WTRPBF, and how is it used?
Pin 8 (TC) on the LT8302IS8E#WTRPBF provides a proportional-to-absolute-temperature (PTAT) voltage (1V at 25°C, 3.35mV/K) to compensate for the negative temperature coefficient of the output diode's forward voltage. By connecting a resistor (RTC) between TC and RREF pins, a PTAT current offsets diode VF drift-enabling ±1% output voltage stability over –40°C to 125°C for 3.3V and 5V outputs, which is essential for automotive and medical applications.
How does LT8302IS8E#WTRPBF manage efficiency across load conditions?
The LT8302IS8E#WTRPBF uses three adaptive modes: quasi-resonant boundary conduction mode at heavy loads for high efficiency and small magnetics; discontinuous conduction mode with frequency clamping (<380kHz) at medium loads to limit switching losses; and low-ripple Burst Mode® at light loads-where it cycles between sleep (106µA IQ) and active states-to maintain >80% efficiency down to 0.5% full load while minimizing output ripple.
Is LT8302IS8E#WTRPBF pin-compatible with other members of the LT8302 family?
Yes, LT8302IS8E#WTRPBF is pin-compatible with all LT8302 and LT8302-3 variants in the S8E package-including LT8302ES8E#WTRPBF, LT8302JS8E#WTRPBF, and LT8302IS8E-3#WTRPBF. Differences lie in temperature grade (I-grade = –40°C to 125°C), boundary detection method (LT8302-3 uses RREF voltage-level sensing vs LT8302's dv/dt), and qualification level-but pinout, package, and electrical interface remain identical across all S8E variants.
LT8302IS8E#WTRPBF 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 (Switch)
- Frequency - Switching:
- Down to 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8302IS8E#WTRPBF FAQ
1.How can I place an order for LT8302IS8E#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302IS8E#WTRPBF 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#WTRPBF reliable?
The price and inventory of LT8302IS8E#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8302IS8E#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT8302IS8E#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302IS8E#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302IS8E#WTRPBF?
LT8302IS8E#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302IS8E#WTRPBF 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#WTRPBF?
For technical support, including LT8302IS8E#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302IS8E#WTRPBF requirements.
6.How does Aetrix verify that LT8302IS8E#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT8302IS8E#WTRPBF 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#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT8302IS8E#WTRPBF?
All LT8302IS8E#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302IS8E#WTRPBF, 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#WTRPBF part is unused and in its original packaging.
Return procedure for LT8302IS8E#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8302IS8E#WTRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
