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Analog Devices Inc. LT8302ES8E-3#TRPBF
- Part No.:
- LT8302ES8E-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302ES8E-3#TRPBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,330
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Product details
Overview
LT8302ES8E-3#TRPBF 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. It regulates output voltage without opto-isolator or third transformer winding via 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#TRPBF datasheet, LT8302ES8E-3#TRPBF pinout, LT8302ES8E-3#TRPBF application, or LT8302ES8E-3#TRPBF equivalent, key selection criteria include its 106µA sleep-mode quiescent current, 3.6A/65V internal switch, ±1% RREF reference accuracy, AEC-Q100 qualification (E-grade), and thermally enhanced 8-lead SO package with exposed GND pad.
Technical Context
The LT8302ES8E-3#TRPBF implements quasi-resonant boundary conduction mode at heavy load-turning on the switch at the SW node valley when secondary current reaches zero-to minimize switching losses and improve load regulation. Its sample-and-hold error amplifier directly monitors the isolated output voltage by sensing the flyback pulse amplitude across RFB, 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. The device integrates internal compensation, soft-start (11ms), EN/UVLO with 1.214V enable threshold and 14mV hysteresis, and temperature-compensated output regulation via TC pin (1V at 25°C, 3.35mV/K PTAT).
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 breakdown, 3.6A peak, 80mΩ RDS(ON) - enables compact 18W isolated designs without external MOSFET. |
| Quiescent Current | 106µA in Sleep Mode - extends battery life in always-on auxiliary supplies. |
| RREF Reference Voltage | 1.00V ±2% - sets output voltage accuracy baseline; line regulation ±0.01%/V ensures stability across input range. |
| Switching Modes | Boundary mode (heavy load), Discontinuous mode (mid-load), Low-ripple Burst Mode® (light load) - balances efficiency, EMI, and regulation across full load range. |
| Temperature Grade | –40°C to +125°C junction - qualified per AEC-Q100 for automotive under-hood and industrial environments. |
| Package | 8-Lead Plastic SO with exposed GND pad - θJA = 33°C/W thermal resistance enables high-power density without heatsink. |
Pinout & Package
LT8302ES8E-3#TRPBF is housed in an 8-lead plastic SOIC package (S8E) with exposed GND pad (Pin 9), requiring soldering to PCB ground plane for thermal and electrical performance. Pin 1 is EN/UVLO; Pin 2 is INTVCC; Pin 3 is VIN; Pin 4 is GND; Pin 5 is SW; Pin 6 is RFB; Pin 7 is RREF; Pin 8 is TC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and input undervoltage lockout input | 1.214V enable threshold with 14mV hysteresis; pull below 0.3V to shut down; supports programmable VIN UVLO with resistor divider. |
| INTVCC (Pin 2) | Internal 3V LDO output | Powers internal circuitry; must be bypassed with ≥1µF ceramic capacitor to GND; no external supply allowed. |
| VIN (Pin 3) | Main input supply rail | Supplies control logic and serves as reference for RFB feedback network; requires local bulk capacitance. |
| GND (Pin 4 & Exposed Pad Pin 9) | Power and signal ground reference | Exposed pad provides primary thermal path and low-impedance GND connection; must be soldered to PCB ground plane. |
| SW (Pin 5) | Drain of internal DMOS switch | Connects to transformer primary; high dv/dt node-minimize trace area to reduce EMI and voltage spikes. |
| 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; internal 1.00V reference forces IRFB × RREF ≈ 1.00V; used with TC for diode temp compensation. |
| TC (Pin 8) | Temperature compensation output | PTAT voltage (1V at 25°C, 3.35mV/K); connects to RREF via RTC to offset output diode VF drift (–1 to –2mV/°C). |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces BOM count, cost, and board space while eliminating opto aging, nonlinearity, and dynamic response limitations. |
| Low-ripple Burst Mode® operation | Maintains <15mVpp output ripple at light loads while achieving >80% efficiency at 10mA, critical for noise-sensitive analog circuits. |
| Accurate EN/UVLO with hysteresis | 1.214V enable threshold ±36mV and 14mV hysteresis enable robust start-up sequencing and brown-out protection in automotive systems. |
| Internal compensation and soft-start | Eliminates external compensation components; 11ms soft-start prevents inrush current and transformer saturation during power-up. |
| Output short-circuit protection | Auto-recovery hiccup mode limits fault energy and prevents thermal runaway during sustained short-circuit events. |
Applications
| Automotive Auxiliary Power Supply | Industrial Isolated Sensor Interface |
|---|---|
Use Scenario: Providing isolated 5V/1A housekeeping power for CAN transceivers, microcontrollers, and ADCs in engine control units (ECUs) and ADAS modules. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without optocoupler, using boundary mode for full-load efficiency and Burst Mode® for standby. Use Value: Enables AEC-Q100-compliant 18W isolated supply with <106µA quiescent current-reducing battery drain during vehicle sleep mode. | Use Scenario: Generating isolated 3.3V/500mA bias for precision current-sense amplifiers and isolated RS-485 transceivers in factory automation PLCs. IC Role / Device Role / Timing Role: Micropower flyback controller implementing primary-side regulation to eliminate opto drift and maintain ±1% output accuracy over –40°C to +125°C. Use Value: Delivers stable, low-noise isolated power with <0.5% minimum load requirement-enabling reliable operation even with intermittent sensor polling. |
| Medical Patient Monitoring Auxiliary Rail | Telecom Remote PHY Power |
Use Scenario: Supplying isolated 12V/1.5A for isolated gate drivers and analog front-ends in portable ECG and EEG devices requiring reinforced insulation. IC Role / Device Role / Timing Role: Boundary-mode flyback controller with integrated 65V/3.6A switch, supporting transformer turns-ratio flexibility for multi-output isolation schemes. Use Value: Achieves >85% efficiency at 2A load while meeting IEC 60601 creepage/clearance requirements via compact, opto-free design. | Use Scenario: Delivering isolated 5V/2A to remote PHY chips in fiber-to-the-home (FTTH) nodes where space, efficiency, and reliability are critical. IC Role / Device Role / Timing Role: High-integration flyback controller with low-ripple Burst Mode® and internal soft-start, enabling fast wake-up from deep sleep states. Use Value: Reduces system standby power by 40% vs. traditional opto-based solutions, extending node uptime between maintenance cycles. |
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#TRPBF | Lacks TC pin and temperature compensation; lower 2.5A/65V switch rating; no AEC-Q100 qualification. | Suitable only for non-automotive, single-output 3.3V/5V supplies where diode temp drift is negligible. | Select LT8301ES8E#TRPBF only if cost sensitivity outweighs need for output stability over temperature and automotive compliance. |
| UCC28742DR | TI part with 65V/3.5A switch; uses different boundary detection method; no integrated TC compensation; 1.25V reference vs. 1.00V. | Requires external compensation; lacks AEC-Q100 grade; optimized for higher-frequency operation (up to 1MHz). | Choose UCC28742DR when designing for higher switching frequencies or when leveraging TI's WEBENCH ecosystem for rapid prototyping. |
Compared with LT8301ES8E#TRPBF and UCC28742DR, the LT8302ES8E-3#TRPBF offers unique integrated temperature compensation for output diode drift, AEC-Q100 qualification, and tighter RREF reference (1.00V ±2%), making it the preferred choice for automotive and precision industrial isolated supplies demanding long-term output stability.
Availability
LT8302ES8E-3#TRPBF is available at Aetrix Electronics and suitable for automotive auxiliary power supplies, industrial isolated sensor interfaces, medical patient monitoring rails, and telecom remote PHY power requiring stable component supply, AEC-Q100 compliance, and low-quiescent-current isolated conversion.
Supply support for LT8302ES8E-3#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 with precision power, signal chain, and timing solutions.
The LT8302/LT8302-3 product line delivers micropower isolated flyback controllers with integrated switches, designed specifically for space-constrained, high-reliability auxiliary power applications where opto-isolator elimination, wide input range, and automotive qualification are essential.
FAQ
What is the key difference between LT8302ES8E-3#TRPBF and LT8302ES8E#TRPBF?
The LT8302ES8E-3#TRPBF uses voltage-level-based boundary detection on the RREF pin, while the LT8302ES8E#TRPBF relies on dv/dt slope detection. This makes the -3 variant less sensitive to noise on RREF-especially beneficial in multi-winding output designs-and improves robustness in electrically noisy automotive environments. Both share identical pinout, package, and core specifications.
Does LT8302ES8E-3#TRPBF require an external optocoupler for regulation?
No, the LT8302ES8E-3#TRPBF does not require an external optocoupler. It achieves precise isolated output regulation by sampling the flyback pulse amplitude directly from the primary-side SW node through the RFB resistor, then comparing it to the internal 1.00V RREF reference. This eliminates opto aging, nonlinearity, and layout complexity while maintaining ±1% typical output accuracy.
How does the TC pin on LT8302ES8E-3#TRPBF improve output voltage stability?
The TC pin on LT8302ES8E-3#TRPBF outputs a PTAT voltage (1V at 25°C, 3.35mV/K) that tracks junction temperature. When connected via RTC resistor to RREF, it injects compensating current to counteract the negative temperature coefficient of the output diode (–1 to –2mV/°C). This reduces output voltage drift from ±300mV to <±50mV over –40°C to +125°C in 5V designs.
What is the minimum load requirement for stable operation of LT8302ES8E-3#TRPBF?
The LT8302ES8E-3#TRPBF has a typical minimum load requirement of <0.5% of full output current-approximately 5mA for a 1A design. This is enabled by its low-ripple Burst Mode® operation and accurate sample-and-hold architecture, allowing reliable regulation even during ultra-light or intermittent loading common in sensor and standby-power applications.
Can LT8302ES8E-3#TRPBF support multiple isolated outputs?
Yes, the LT8302ES8E-3#TRPBF supports multiple isolated outputs using a single transformer with multiple secondary windings. Its primary-side sensing architecture inherently regulates the main output; auxiliary outputs follow turns-ratio scaling. For tight regulation of auxiliaries, post-regulation (e.g., LDOs) is recommended. The -3 variant's noise-immune RREF boundary detection enhances stability in such multi-winding configurations.
LT8302ES8E-3#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):
- 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#TRPBF FAQ
1.How can I place an order for LT8302ES8E-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302ES8E-3#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 LT8302ES8E-3#TRPBF reliable?
The price and inventory of LT8302ES8E-3#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8302ES8E-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302ES8E-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302ES8E-3#TRPBF?
LT8302ES8E-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302ES8E-3#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 LT8302ES8E-3#TRPBF?
For technical support, including LT8302ES8E-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302ES8E-3#TRPBF requirements.
6.How does Aetrix verify that LT8302ES8E-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8302ES8E-3#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 LT8302ES8E-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8302ES8E-3#TRPBF?
All LT8302ES8E-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302ES8E-3#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 LT8302ES8E-3#TRPBF part is unused and in its original packaging.
Return procedure for LT8302ES8E-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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