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Analog Devices Inc. LT8302ES8E-3#PBF
- Part No.:
- LT8302ES8E-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302ES8E-3#PBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:555
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Product details
Overview
LT8302ES8E-3#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. It regulates output voltage without opto-isolator or third transformer winding using primary-side flyback waveform sampling, supports boundary mode for heavy loads and low-ripple Burst Mode® for light loads, and targets auxiliary/housekeeping power in automotive and industrial systems.
For engineers reviewing the LT8302ES8E-3#PBF datasheet, LT8302ES8E-3#PBF pinout, LT8302ES8E-3#PBF application, or LT8302ES8E-3#PBF equivalent, key selection criteria include its 106µA sleep-mode quiescent current, ±1.0% RREF reference accuracy, 12kHz minimum switching frequency, AEC-Q100 qualification (E-grade), and thermally enhanced 8-lead SO package with exposed GND pad.
Technical Context
The LT8302ES8E-3#PBF implements quasi-resonant boundary conduction mode at heavy load-turning on the internal switch at the SW pin valley when secondary current reaches zero-to achieve excellent load regulation and enable compact magnetics. Its sample-and-hold error amplifier directly monitors the isolated output via the RFB/RREF resistor network, eliminating need for optocouplers or auxiliary windings.
At light loads, it transitions to low-ripple Burst Mode® operation with 12kHz minimum frequency, maintaining high efficiency while limiting output voltage ripple; minimum load requirement is <0.5% of full output. The TC pin provides PTAT voltage (3.35mV/°K) for precise output diode temperature compensation, critical for stable 3.3V/5V outputs across –40°C to 125°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-input industrial and automotive battery rails without external pre-regulation. |
| Output Power | Up to 18W - enables isolated auxiliary supplies for microcontrollers, sensors, and gate drivers in space-constrained designs. |
| Internal Switch | 65V/3.6A DMOS - handles 50V flyback spikes with 15V margin, simplifying transformer design and reducing component count. |
| Quiescent Current | 106µA in Sleep Mode - extends battery life in always-on systems such as vehicle body controllers and IoT edge nodes. |
| RREF Accuracy | ±1.0% (0.98V–1.02V) - ensures tight initial output voltage tolerance for 5V/3.3V rails without post-production trimming. |
| Switch On-Resistance | 80mΩ at 1.5A - minimizes conduction loss and thermal rise in high-current flyback stages. |
| Minimum Frequency | 11.3kHz - guarantees sufficient sampling rate for accurate output voltage regulation in Burst Mode®. |
Pinout & Package
LT8302ES8E-3#PBF is housed in an 8-lead plastic SO package (S8E) with exposed GND pad (Pin 9) that must be soldered to PCB for thermal and electrical performance. θJA = 33°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | Accurate 1.214V enable threshold with 14mV hysteresis; allows programmable VIN UVLO using resistor divider. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal logic and gate driver; requires ≥1µF 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 path; requires local bulk capacitance. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power and Signal Ground | Primary return path for all currents; exposed pad is mandatory for thermal management and noise reduction. |
| SW (Pin 5) | Drain of Internal DMOS Switch | Connects to transformer primary; high dv/dt node requiring minimized trace area to suppress EMI and voltage overshoot. |
| RFB (Pin 6) | Feedback Current Input | Converts flyback pulse amplitude into current; ratio with RREF sets output voltage; sensitive to layout parasitics. |
| RREF (Pin 7) | Reference Resistor Terminal | Ground-referred node for RREF resistor; trimmed for 1.00V reference; used with TC for temperature compensation. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1.00V at 25°C, 3.35mV/°K); enables output diode forward-voltage drift cancellation for ±2% output stability. |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces BOM count by 3–5 components and eliminates opto aging/nonlinearity issues in long-life automotive applications. |
| Boundary mode + low-ripple Burst Mode® | Enables >85% efficiency from 10mA to full load while keeping output ripple <50mVPP at light loads. |
| Integrated soft-start and internal compensation | Eliminates external RC networks and loop compensation components, shortening design cycle and improving consistency. |
| AEC-Q100 qualified (Grade E) | Validated for automotive under-hood and infotainment auxiliary supplies with guaranteed –40°C to 125°C operation. |
| Output short-circuit protection | Prevents damage during fault conditions without external current-sense resistors or shutdown circuitry. |
Applications
| Automotive Body Control Module (BCM) Auxiliary Supply | Industrial PLC Isolated I/O Power |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface circuits in vehicle door modules where space and heat dissipation are constrained. IC Role / Device Role / Timing Role: Primary-side isolated flyback controller regulating 5V/3.3V rail from 12V battery with no optocoupler. Use Value: Enables AEC-Q100-compliant, low-quiescent-power auxiliary supply with <0.5% minimum load and <50mV ripple at 10mA. | Use Scenario: Supplies isolated 5V rail for digital input/output channels in programmable logic controllers operating from 24V DC field bus. IC Role / Device Role / Timing Role: Micropower flyback controller delivering galvanically isolated power to field-side logic with primary-side sensing. Use Value: Reduces transformer complexity and improves long-term reliability versus opto-based solutions in harsh industrial environments. |
| Medical Patient Monitoring Auxiliary Power | Smart Energy Meter Housekeeping Supply |
Use Scenario: Generates isolated 3.3V supply for low-power MCU and analog front-end in portable ECG monitors requiring reinforced isolation. IC Role / Device Role / Timing Role: Boundary-mode flyback controller meeting IEC 60601 creepage/clearance requirements via transformer-only isolation. Use Value: Achieves <100µA sleep current and ±2% output regulation over temperature-critical for battery-backed medical devices. | Use Scenario: Provides isolated 5V housekeeping power for metrology ASIC and RTC in utility smart meters powered from AC mains via bridge rectifier. IC Role / Device Role / Timing Role: High-voltage-input flyback controller operating from 3V–42V unregulated DC bus derived from rectified AC. Use Value: Supports wide-input operation with minimal external parts, enabling single-design reuse across global metering platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8301ES8E#PBF | Lower 36V max input, 2.5A switch, no TC pin, same boundary/Burst Mode architecture | Suitable only for ≤36V input systems; lacks temperature compensation for precision low-VOUT regulation | Select when input voltage never exceeds 36V and output diode drift is acceptable or externally compensated. |
| UCC28740DR | Texas Instruments PSR flyback controller with 90V max VSW, 1.5A switch, different control algorithm and pinout | Requires different transformer design and feedback network; higher VSW rating suits universal AC input derivatives | Choose for higher-voltage flyback topologies or TI ecosystem alignment; not pin-compatible. |
Compared with LT8301ES8E#PBF and UCC28740DR, the LT8302ES8E-3#PBF offers superior 42V input capability, 3.6A switch current, and integrated TC compensation-making it optimal for automotive auxiliary supplies demanding AEC-Q100 compliance and tight 5V/3.3V regulation across temperature.
Availability
LT8302ES8E-3#PBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O isolation, and medical patient monitoring equipment requiring stable component supply with AEC-Q100 qualification and extended temperature support.
Supply support for LT8302ES8E-3#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 power management semiconductors, serving industrial, automotive, communications, and healthcare markets with precision signal chain and power solutions.
The LT8302/LT8302-3 product line delivers micropower primary-side regulated isolated flyback controllers optimized for space- and efficiency-critical auxiliary power in automotive and industrial applications-eliminating optocouplers while maintaining ±2% output accuracy.
FAQ
What is the maximum input voltage supported by the LT8302ES8E-3#PBF?
The LT8302ES8E-3#PBF supports an absolute maximum input voltage of 42V, with operational range from 3V to 42V. This makes it suitable for 12V and 24V automotive battery systems including cold-crank and load-dump transients when properly clamped. The internal 65V-rated DMOS switch provides headroom for flyback voltage spikes, but design must ensure SW node stays below 65V under worst-case leakage inductance conditions.
Does the LT8302ES8E-3#PBF require an optocoupler or third transformer winding for regulation?
No, the LT8302ES8E-3#PBF does not require an optocoupler or third transformer winding. It achieves isolated output voltage regulation by sampling the flyback pulse directly from the primary-side SW node using an internal sample-and-hold error amplifier. This architecture reduces component count, improves long-term reliability, and avoids optocoupler aging and nonlinearity issues inherent in traditional isolated supplies.
How does the TC pin on the LT8302ES8E-3#PBF improve output voltage stability?
The TC pin on the LT8302ES8E-3#PBF outputs a PTAT voltage (3.35mV/°K, 1.00V at 25°C) used to compensate for the negative temperature coefficient of the output diode's forward voltage. By connecting an RTC resistor between TC and RREF pins, a temperature-proportional current offsets diode drift-enabling ±2% output regulation over –40°C to 125°C for 5V and 3.3V outputs, critical in automotive and medical applications.
What is the difference between LT8302 and LT8302-3 variants?
The LT8302ES8E-3#PBF uses a voltage-level-based boundary detection method on the RREF pin, whereas the standard LT8302 relies on dv/dt slope detection. This makes the LT8302-3 variant less sensitive to noise on the RREF node and more robust in multi-output or high-noise transformer designs-especially beneficial for automotive applications where EMI immunity is critical.
Is the LT8302ES8E-3#PBF AEC-Q100 qualified, and what grade does it meet?
Yes, the LT8302ES8E-3#PBF is AEC-Q100 qualified and specified for Grade E (–40°C to +125°C junction temperature). It is manufactured with controlled processes to meet automotive reliability and quality requirements, including HTOL, temperature cycling, and ESD testing-making it suitable for under-hood and cabin auxiliary power applications in passenger vehicles and commercial vehicles.
LT8302ES8E-3#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):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- 65V (Switch)
- 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
LT8302ES8E-3#PBF FAQ
1.How can I place an order for LT8302ES8E-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302ES8E-3#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 LT8302ES8E-3#PBF reliable?
The price and inventory of LT8302ES8E-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8302ES8E-3#PBF is usually 5 days.
3.What payment methods are accepted for LT8302ES8E-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302ES8E-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302ES8E-3#PBF?
LT8302ES8E-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302ES8E-3#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 LT8302ES8E-3#PBF?
For technical support, including LT8302ES8E-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302ES8E-3#PBF requirements.
6.How does Aetrix verify that LT8302ES8E-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT8302ES8E-3#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 LT8302ES8E-3#PBF meets industry standards.
7.What is the process for return or replacement of LT8302ES8E-3#PBF?
All LT8302ES8E-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302ES8E-3#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 LT8302ES8E-3#PBF part is unused and in its original packaging.
Return procedure for LT8302ES8E-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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