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Analog Devices Inc. LT8302HS8E#WPBF
- Part No.:
- LT8302HS8E#WPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302HS8E#WPBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:117
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Product details
Overview
LT8302HS8E#WPBF from Analog Devices is a monolithic micropower isolated flyback controller 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 enables opto-isolator–free regulation via primary-side flyback waveform sampling, supports boundary mode for high efficiency at heavy load and low-ripple Burst Mode® for <106µA sleep current, and is AEC-Q100 qualified for automotive auxiliary power supplies.
For engineers reviewing the LT8302HS8E#WPBF datasheet, LT8302HS8E#WPBF pinout, LT8302HS8E#WPBF application, or LT8302HS8E#WPBF equivalent, this page delivers verified technical context, exact pin functions, real-world load regulation behavior, temperature-compensated 5V/12V/24V design guidance, and validated automotive-grade alternatives - all grounded in Rev. G datasheet specifications and Analog Devices' official characterization data.
Technical Context
The LT8302HS8E#WPBF implements quasi-resonant boundary conduction mode (BCM) at heavy load-sensing zero-current crossing on the RREF pin to trigger valley-switching-and transitions to discontinuous conduction mode (DCM) when internal oscillator clamps frequency below 380kHz. Its sample-and-hold error amplifier captures the isolated output voltage during flyback pulse collapse, eliminating need for third winding or opto-isolator.
It integrates internal 3V LDO (INTVCC), accurate 1.214V EN/UVLO threshold with 14mV hysteresis, 1.00V RREF reference with ±0.01%/V line regulation, and PTAT TC pin (1V @ 25°C, 3.35mV/K) for diode-forward-voltage compensation. Minimum switch-on time is 160ns; maximum off-time is 170µs; RDS(ON) is 80mΩ at 1.5A.
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 - handles 50V flyback spikes with 15V margin; enables compact transformer design |
| Quiescent Current | 106µA in Sleep Mode - sustains >1000-hour battery backup for always-on automotive modules |
| Output Regulation Method | Primary-side flyback pulse sampling - eliminates opto-isolator, third winding, and associated aging/nonlinearity |
| Junction Temp Range | –40°C to 150°C - rated for under-hood automotive environments per AEC-Q100 H-grade |
| Switching Modes | Boundary mode (heavy load), DCM (mid-load), Low-ripple Burst Mode® (light load) - balances efficiency, EMI, and output ripple |
| Reference Voltage | 1.00V ±2% on RREF pin - sets output voltage via RFB/RREF ratio; enables precise 5V/12V/24V designs |
Pinout & Package
LT8302HS8E#WPBF uses an 8-lead plastic SO package with exposed thermal pad (Pin 9, GND), θJA = 33°C/W. The package is AEC-Q100 qualified and optimized for automotive PCB layouts requiring robust thermal dissipation and EMI control.
| 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 logic and gate driver; requires ≥1µF local ceramic bypass; 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 decoupling |
| GND (Pins 4 & 9) | Power and Thermal Ground | Pin 4 = signal ground; Pin 9 = exposed pad = mandatory soldered GND plane connection for thermal and EMI performance |
| SW (Pin 5) | Drain of Integrated DMOS Switch | Connects to transformer primary; trace minimization critical to suppress 65V switching transients and EMI |
| RFB (Pin 6) | Feedback Current Input | Converts flyback pulse amplitude into current; determines output voltage via RFB/RREF ratio and turns ratio |
| RREF (Pin 7) | Reference Resistor Terminal | Ground-referred node for 1.00V reference; sets feedback gain; used with RTC for temperature compensation |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1V @ 25°C, 3.35mV/K); sources/sinks current through RTC to offset 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, and dynamic response limitations |
| Low-ripple Burst Mode® operation | Maintains <15mVpp output ripple at light load while achieving >80% efficiency down to 0.5% full-load |
| Boundary mode with valley switching | Enables zero-current turn-on, minimizing switching loss and enabling smaller magnetics vs. CCM |
| Integrated soft-start and compensation | Eliminates external compensation network; 11ms internal soft-start prevents inrush current stress |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C junction operation; meets automotive reliability and lifetime requirements |
| Output short-circuit protection | Auto-recovery hiccup mode limits power dissipation during sustained fault conditions |
Applications
| Automotive Auxiliary Power | Industrial Isolated Sensors |
|---|---|
Use Scenario: Powering CAN transceivers, LIN bus nodes, and EEPROMs in vehicle body control modules where space and heat dissipation are constrained. IC Role / Device Role / Timing Role: Primary-side isolated flyback controller providing 5V/100mA housekeeping rail from 12V battery with no optocoupler. Use Value: Enables AEC-Q100-compliant 5V rail generation in <1 cm² PCB area; 106µA sleep current extends battery life during vehicle sleep mode. |
Use Scenario: Isolated 24V-to-5V conversion for pressure/temperature sensors in hazardous industrial zones requiring reinforced insulation. IC Role / Device Role / Timing Role: Flyback controller regulating isolated 5V output from 24V DC supply, with primary-side sensing eliminating secondary-side feedback complexity. Use Value: Achieves >85% efficiency at 1A load and <50mV ripple without opto-isolator derating; supports IEC 61000-4-5 surge immunity via transformer isolation. |
| Medical Patient Monitoring | Smart Building Controllers |
Use Scenario: Generating isolated 3.3V/5V rails for microcontrollers and analog front-ends in portable ECG and pulse oximeter devices. IC Role / Device Role / Timing Role: Micropower flyback controller delivering regulated output with <100µA quiescent current and low EMI for sensitive analog circuits. Use Value: Meets IEC 60601-1 creepage/clearance requirements via transformer isolation; 150°C rating supports sealed enclosure thermal profiles. |
Use Scenario: Powering isolated RS-485 transceivers and microcontrollers in HVAC controllers mounted inside metal enclosures. IC Role / Device Role / Timing Role: Boundary-mode flyback controller providing 5V/2A isolated output from 24V building power bus. Use Value: Delivers 18W output with <3% load regulation across 10mA–2A; TC pin compensation maintains ±1.5% output accuracy over –25°C to +70°C ambient. |
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#PBF | Requires external MOSFET; no integrated switch; supports up to 100V input; lacks TC pin and low-ripple Burst Mode® | Better suited for >65V input or higher-power (>25W) isolated supplies; no built-in temperature compensation for diode VF | Select when input exceeds 42V or when discrete FET optimization is needed; adds layout complexity and component count. |
| UCC28740DR | TI part with integrated 700V FET; uses different primary-sensing architecture (aux winding); no TC pin; 100µA typical IQ | Targeted at universal AC input (85–265VAC); not AEC-Q100 qualified; requires auxiliary winding for VDD and sensing | Choose only for AC/DC flyback; unsuitable for automotive DC input due to lack of AEC-Q100 rating and aux-winding dependency. |
Compared with LT3748EMS#PBF and UCC28740DR, the LT8302HS8E#WPBF uniquely combines AEC-Q100 H-grade qualification, integrated 65V/3.6A switch, primary-side sensing without aux winding, and TC-based diode compensation - making it the only drop-in solution for compact, high-reliability 12V/24V automotive auxiliary supplies requiring <106µA sleep current and ±1.5% output stability over temperature.
Availability
LT8302HS8E#WPBF is available at Aetrix Electronics and suitable for automotive auxiliary power supplies, industrial sensor interfaces, medical patient monitors, and smart building controllers requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LT8302HS8E#WPBF 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 with precision power, signal chain, and timing solutions.
The LT8302HS8E#WPBF belongs to Analog Devices' µModule®-adjacent isolated power controller family, designed specifically for space-constrained, high-reliability automotive and industrial applications needing opto-free, thermally robust, and AEC-Q100-compliant isolated DC/DC conversion.
FAQ
What is the maximum output power achievable with LT8302HS8E#WPBF?
The LT8302HS8E#WPBF delivers up to 18W of isolated output power. This is achieved with a 3:1 transformer turns ratio at 24V input, supporting 5V/2.9A, 12V/1.5A, or 24V/0.75A outputs. Power capability scales with input voltage and transformer design; the integrated 65V/3.6A switch and boundary-mode operation enable high efficiency across the 3V–42V input range. Real-world output is confirmed in Figure TA01b of the Rev. G datasheet.
Does LT8302HS8E#WPBF require an opto-isolator or third transformer winding?
No, the LT8302HS8E#WPBF does not require an opto-isolator or third winding. It regulates the isolated output voltage by sampling the primary-side flyback waveform directly at the SW pin during zero-secondary-current events. This proprietary method eliminates opto aging, nonlinearity, and layout complexity while maintaining ±1.5% output accuracy over temperature and load - as verified in the TPCs on pages 4–5 of the Rev. G datasheet.
How does the TC pin on LT8302HS8E#WPBF improve output voltage stability?
The TC pin on LT8302HS8E#WPBF provides a proportional-to-absolute-temperature (PTAT) voltage (1V at 25°C, 3.35mV/K) that compensates for the negative temperature coefficient of the output diode's forward voltage (–1 to –2mV/°C). By connecting RTC between TC and RREF, a PTAT current offsets diode VF drift - reducing output variation from ±5% to ±1.5% over –40°C to +125°C, as demonstrated in Figure G02 and detailed in Application Note page 11.
Is LT8302HS8E#WPBF pin-compatible with other LT8302 variants?
Yes, LT8302HS8E#WPBF shares identical pinout and footprint with all LT8302 and LT8302-3 variants in the S8E package, including LT8302ES8E#PBF and LT8302IS8E#WPBF. Differences lie solely in temperature grade (H-grade = –40°C to +150°C) and automotive qualification (#WPBF suffix), not pin function or electrical interface - confirmed in the "Lead Free Finish" table on page 2 of the Rev. G datasheet.
What protection features are integrated into LT8302HS8E#WPBF?
The LT8302HS8E#WPBF integrates output short-circuit protection with auto-recovery hiccup mode, overtemperature shutdown (active above 150°C junction), internal current limiting (3.6A typical switch limit), INTVCC UVLO (2.47V falling threshold), and accurate EN/UVLO hysteresis (14mV). These protections are fully characterized across temperature and documented in Absolute Maximum Ratings (page 2) and Electrical Characteristics (page 3) of the Rev. G datasheet.
LT8302HS8E#WPBF 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):
- 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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8302HS8E#WPBF FAQ
1.How can I place an order for LT8302HS8E#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302HS8E#WPBF 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#WPBF reliable?
The price and inventory of LT8302HS8E#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8302HS8E#WPBF is usually 5 days.
3.What payment methods are accepted for LT8302HS8E#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302HS8E#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302HS8E#WPBF?
LT8302HS8E#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302HS8E#WPBF 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#WPBF?
For technical support, including LT8302HS8E#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302HS8E#WPBF requirements.
6.How does Aetrix verify that LT8302HS8E#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8302HS8E#WPBF 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#WPBF meets industry standards.
7.What is the process for return or replacement of LT8302HS8E#WPBF?
All LT8302HS8E#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302HS8E#WPBF, 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#WPBF part is unused and in its original packaging.
Return procedure for LT8302HS8E#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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