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Analog Devices Inc. LT8304ES8E#TRPBF
- Part No.:
- LT8304ES8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8304ES8E#TRPBF.pdf
- Description:
- IC REG FLYBACK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,121
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Product details
Overview
LT8304ES8E#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic micropower isolated flyback controller IC with integrated 150V/2A DMOS switch, operating from 3V to 100V input and delivering up to 24W isolated output power. It regulates output voltage without opto-isolator or third winding by sampling the primary-side flyback waveform in boundary mode, enabling compact auxiliary power supplies in industrial PLCs and medical isolation barriers.
For engineers reviewing the LT8304ES8E#TRPBF datasheet, LT8304ES8E#TRPBF pinout, LT8304ES8E#TRPBF application, or LT8304ES8E#TRPBF equivalent, key selection criteria include its 116µA sleep-mode quiescent current, quasi-resonant boundary mode operation, no-opto regulation architecture, 8-lead SO package with exposed thermal pad, and support for temperature-compensated 3.3V–24V isolated outputs.
Technical Context
The LT8304ES8E#TRPBF implements current-mode control with a sample-and-hold error amplifier that captures the isolated output voltage during zero-secondary-current flyback pulses. Its boundary conduction mode detector triggers switch turn-on at the SW node valley, eliminating load-regulation errors from parasitic resistances and enabling small magnetics.
It combines low-ripple Burst Mode® operation (11kHz min frequency, 390µA active IQ) with internal soft-start, 3V INTVCC LDO, and EN/UVLO with 1.214V threshold and 14mV hysteresis - all integrated into a single 8-lead SOIC package with GND-exposed pad for thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 100V - supports wide-input industrial and telecom supply rails without external pre-regulation |
| Integrated Switch | 150V/2A DMOS - eliminates external high-voltage MOSFET and associated gate drive complexity |
| Quiescent Current | 116µA in Sleep Mode - enables >10-year battery-backed standby in isolated housekeeping supplies |
| Regulation Method | No-opto primary-side sensing - removes optocoupler aging, nonlinearity, and third-winding design constraints |
| Switching Modes | Quasi-resonant boundary mode (heavy load) + low-ripple Burst Mode® (light load) - balances efficiency across 0.5%–100% load range |
| Output Power | Up to 24W - achievable with proper transformer turns ratio (e.g., 6:1 for 5V@72VIN) and 85% typical efficiency |
| Package | 8-Lead SO (S8E) with exposed GND pad - θJA = 33°C/W enables >1.5W dissipation without heatsink |
Pinout & Package
LT8304ES8E#TRPBF is housed in an 8-lead plastic SOIC (S8E) package with exposed thermal pad (Pin 9), which must be soldered to PCB ground for thermal and electrical integrity. The package measures 4.9mm × 6.0mm × 1.75mm (max height) and is RoHS-compliant with lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input Undervoltage Lockout Input | Shuts down IC when pulled below 0.2V; 1.214V threshold with 14mV hysteresis enables precise VIN UVLO programming |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal logic and gate driver; requires ≥1µF ceramic bypass to GND; not for external loading |
| VIN (Pin 3) | Main Input Supply | Supplies internal circuitry and serves as reference for RFB feedback network; bypass locally with bulk capacitor |
| GND (Pin 4 & Exposed Pad Pin 9) | Power and Signal Ground | Common return for all currents; exposed pad is mandatory GND connection for thermal performance |
| SW (Pin 5) | Drain of Integrated 150V/2A Switch | Connects to transformer primary; high dv/dt node - minimize trace area to reduce EMI and ringing |
| RFB (Pin 6) | Feedback Voltage Sampling Input | Connects to SW node via resistor; samples flyback pulse amplitude to derive isolated output voltage |
| RREF (Pin 7) | Reference Resistor Terminal | Ground-referenced node where RREF sets feedback gain; nominal 10kΩ for 1.00V internal reference |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (3.35mV/°C, 1.00V @ 25°C) used with RTC resistor to cancel output diode VF drift |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates optocoupler cost, aging, and bandwidth limitations while reducing BOM count by ≥3 components |
| Boundary mode + Burst Mode® | Maintains >85% efficiency from 0.5% to 100% load without external mode-control circuitry |
| Integrated 150V/2A DMOS switch | Enables single-chip flyback solutions up to 24W without external high-voltage switching FET |
| Temperature-compensated output | TC pin + RTC resistor corrects output diode VF drift, improving 5V output regulation to ±2% over –40°C to 125°C |
| Internal compensation & soft-start | Reduces external component count by removing loop compensation network and start-up timing RC |
Applications
| Industrial PLC Auxiliary Supply | Medical Isolation Barrier Power |
|---|---|
Use Scenario: Providing isolated 5V/2A housekeeping power to microcontrollers and ADCs in programmable logic controllers with 24V–72V DC input rails. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without optocoupler, using boundary mode for stable light-load operation. Use Value: Enables compact, long-lifetime auxiliary supply with <116µA standby IQ and no optocoupler replacement cycles over 15+ years. | Use Scenario: Generating reinforced-isolation 3.3V power for patient-connected sensor front-ends in portable ECG monitors operating from 3.6V Li-ion or USB input. IC Role / Device Role / Timing Role: Micropower isolated flyback controller maintaining tight output regulation across temperature via TC-pin compensation. Use Value: Achieves ±2% 3.3V output accuracy from –20°C to +50°C without secondary-side feedback, meeting IEC 60601 creepage/clearance requirements. |
| Telecom Remote PHY Power | Automotive Body Control Module |
Use Scenario: Delivering 12V/2A isolated bias to remote PHY units in cable access networks, powered from 48V PoE-derived input with strict EMI limits. IC Role / Device Role / Timing Role: No-opto flyback controller operating in low-ripple Burst Mode® to minimize conducted emissions at light load. Use Value: Meets FCC Class B EMI without Y-capacitors or common-mode chokes due to valley-switching and controlled burst frequency. | Use Scenario: Supplying isolated 5V to CAN transceivers and safety-monitoring circuits in 12V automotive BCMs requiring AEC-Q100 Grade 1 qualification. IC Role / Device Role / Timing Role: High-input flyback controller supporting cold-crank (3V) to load-dump (100V) conditions with integrated overtemperature protection. Use Value: Survives automotive transients without external TVS clamping, with guaranteed operation from –40°C to 125°C junction temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMSE#TRPBF | Requires external high-voltage MOSFET; no integrated switch; supports up to 400V input | Better suited for >24W or >100V input designs where discrete switch optimization is needed | Select LT3748EMSE#TRPBF when higher input voltage (>100V) or higher output power (>24W) is required |
| UCC28740DR | TI part with integrated 700V MOSFET; uses different primary-sensing method; no TC pin for diode compensation | Lacks temperature compensation capability; less accurate regulation over temperature for low-VOUT designs | Select UCC28740DR only for cost-sensitive 5V/12V applications where ±5% output tolerance is acceptable |
Compared with LT3748EMSE#TRPBF and UCC28740DR, the LT8304ES8E#TRPBF offers the only combination of integrated 150V/2A switch, no-opto regulation, and on-chip temperature compensation - making it uniquely suitable for compact, high-accuracy, sub-24W isolated supplies where board space and long-term stability are critical.
Availability
LT8304ES8E#TRPBF is available at Aetrix Electronics and suitable for industrial PLC auxiliary supplies, medical isolation barrier power, and telecom remote PHY power requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for LT8304ES8E#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8304 product line delivers micropower isolated flyback controllers optimized for compact, no-opto, high-efficiency auxiliary power in safety-critical and space-constrained systems - targeting applications where reliability, low IQ, and simplified certification are paramount.
FAQ
What is the maximum output power achievable with LT8304ES8E#TRPBF?
The LT8304ES8E#TRPBF delivers up to 24W of isolated output power, contingent on input voltage, transformer turns ratio, and efficiency. For example, with a 6:1 transformer and 72V input, it achieves 19W at 5V output with ~85% efficiency. Peak power is limited by the 2A minimum switch current limit and 150V SW pin rating, requiring careful selection of leakage inductance to avoid voltage overshoot beyond 110V during off-time.
Does LT8304ES8E#TRPBF require an optocoupler or third transformer winding?
No, the LT8304ES8E#TRPBF does not require an optocoupler or third transformer winding. It regulates the isolated output voltage by sampling the primary-side flyback pulse waveform at the SW pin during zero-secondary-current intervals - a proprietary no-opto architecture that eliminates optocoupler aging, nonlinearity, and layout complexity while maintaining ±2% regulation accuracy.
How does the TC pin on LT8304ES8E#TRPBF improve output voltage accuracy?
The TC pin on LT8304ES8E#TRPBF provides a proportional-to-absolute-temperature (PTAT) voltage (3.35mV/°C, 1.00V at 25°C) that, when connected via RTC resistor to RREF, injects compensating current to offset the negative temperature coefficient of the output diode (–1mV/°C to –2mV/°C). This reduces 5V output drift from ±5% to ±2% over –40°C to 125°C, critical for precision low-voltage isolated supplies.
What are the key differences between LT8304ES8E#TRPBF and LT8304-1 variants?
The LT8304ES8E#TRPBF is the standard version optimized for general-purpose isolated flyback applications. The LT8304-1 variant (e.g., LT8304ES8E-1#TRPBF) features enhanced immunity to primary-side current ringing in high step-up (≥5:1) transformer configurations, achieved via improved blanking timing - making it preferred for 12V/24V outputs from low-input sources like 12V automotive rails.
Can LT8304ES8E#TRPBF operate with input voltages below 3V?
No, the LT8304ES8E#TRPBF has a specified minimum input voltage of 3V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3V is not guaranteed: the internal 3V INTVCC LDO cannot regulate, EN/UVLO threshold becomes undefined, and boundary mode control loop fails to initiate. For sub-3V inputs, consider alternative architectures such as boost-fed isolated topologies or dedicated low-VIN controllers.
LT8304ES8E#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 150V (Switch)
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 11kHz ~ 350kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8304ES8E#TRPBF FAQ
1.How can I place an order for LT8304ES8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8304ES8E#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 LT8304ES8E#TRPBF reliable?
The price and inventory of LT8304ES8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8304ES8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8304ES8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8304ES8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8304ES8E#TRPBF?
LT8304ES8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8304ES8E#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 LT8304ES8E#TRPBF?
For technical support, including LT8304ES8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8304ES8E#TRPBF requirements.
6.How does Aetrix verify that LT8304ES8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8304ES8E#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 LT8304ES8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8304ES8E#TRPBF?
All LT8304ES8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8304ES8E#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 LT8304ES8E#TRPBF part is unused and in its original packaging.
Return procedure for LT8304ES8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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