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Analog Devices Inc. LT8304HS8E#TRPBF
- Part No.:
- LT8304HS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8304HS8E#TRPBF.pdf
- Description:
- IC REG FLYBACK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,960
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Product details
Overview
LT8304HS8E#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 enables opto-isolator–free regulation via primary-side flyback pulse sampling, supports boundary mode and low-ripple Burst Mode® operation, and targets high-reliability auxiliary power in automotive, industrial, and medical systems.
For engineers reviewing the LT8304HS8E#TRPBF datasheet, LT8304HS8E#TRPBF pinout, LT8304HS8E#TRPBF application, or LT8304HS8E#TRPBF equivalent, this page delivers verified technical context, exact pin functions, thermal-grade package details (–40°C to 150°C), real-world efficiency curves, and validated alternative options for isolated flyback design.
Technical Context
The LT8304HS8E#TRPBF implements quasi-resonant boundary conduction mode at heavy load-turning on the internal 150V/2A switch at the SW node valley when secondary current reaches zero-to achieve tight load regulation without third-winding sensing. Its sample-and-hold error amplifier captures the isolated output voltage directly from the flyback pulse amplitude, eliminating opto-isolators and reducing component count.
At light loads, it transitions to low-ripple Burst Mode® operation with 11kHz minimum switching frequency and 116µA sleep-mode quiescent current, maintaining >80% efficiency down to 0.5% full-load. The TC pin provides PTAT voltage (3.35mV/°C) for precise output diode temperature compensation, critical for stable 3.3V/5V outputs across –40°C to 150°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 100V - supports wide-input industrial and automotive battery rails without external pre-regulation. |
| Integrated Switch | 150V/2A DMOS - eliminates external high-voltage MOSFET; rated for 150V transients on SW pin. |
| Quiescent Current | 116µA (sleep mode), 390µA (active mode) - enables micropower operation in always-on auxiliary supplies. |
| Switching Frequency | 8–385 kHz (variable) - boundary mode enables small magnetics; clamped max frequency avoids MHz-range losses. |
| Output Power Capability | Up to 24W isolated - achievable with optimized transformer turns ratio (e.g., 6:1 for 5V out at VIN = 72V). |
| Junction Temperature Range | –40°C to +150°C - H-grade qualification ensures reliability in under-hood, industrial control, and medical enclosures. |
| Regulation Accuracy | ±1.5% over line/load/temp - enabled by 1.00V ±2% RREF reference and precise EN/UVLO hysteresis (14mV). |
Pinout & Package
LT8304HS8E#TRPBF is housed in an 8-lead plastic SO package (S8E) with exposed thermal pad (Pin 9, GND), rated for θJA = 33°C/W. The thermally enhanced construction supports continuous operation at 150°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input Undervoltage Lockout Input | Shuts down IC below 0.2V; enables at 1.214V threshold with 14mV hysteresis - allows programmable VIN UVLO using resistor divider. |
| INTVCC (Pin 2) | Internal 3.0V 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 network - bypass locally with bulk capacitor. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power and Signal Ground | Common return for all circuits; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. |
| SW (Pin 5) | Drain of Internal 150V/2A DMOS Switch | Connects to primary winding; high dv/dt node - minimize trace area to reduce EMI and voltage spikes. |
| RFB (Pin 6) | Feedback Resistor Input | Connects to SW node via RFB resistor; samples flyback pulse amplitude to derive isolated output voltage. |
| RREF (Pin 7) | Reference Resistor Input | Ground-referenced node for RREF (typically 10kΩ); sets output voltage via VREF = 1.00V and RFB/RREF ratio. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1.00V at 25°C, +3.35mV/°C) - used with RTC resistor to cancel output diode VF drift. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates opto-isolator and third transformer winding - reduces BOM cost, improves long-term stability, and avoids aging-related drift. |
| Boundary mode + Burst Mode® | Enables small magnetic size with excellent load regulation at full load, and <15mVpp output ripple at light load without external post-regulation. |
| Integrated soft-start & compensation | 11ms internal soft-start prevents inrush; internal loop compensation removes need for external Type II/III networks. |
| Output short-circuit protection | Auto-recovery hiccup mode limits power dissipation during sustained fault - protects transformer, diode, and IC under overload. |
| Thermally enhanced H-grade package | Rated for –40°C to +150°C junction temperature - qualified for under-hood automotive, industrial PLC, and medical power supply applications. |
Applications
| Industrial Auxiliary Power | Automotive Body Control Module |
|---|---|
|
Use Scenario: Isolated 5V housekeeping supply for PLC I/O modules powered from 24VDC or 48VDC field bus. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated 5V output without opto-isolator or third winding. Use Value: Reduces bill-of-materials by 3 components (opto-isolator, TL431, third winding), improves MTBF, and maintains ±2% regulation across –40°C to +85°C ambient. |
Use Scenario: 3.3V isolated supply for CAN transceiver and microcontroller in body control unit (BCU) with 9V–16V battery input. IC Role / Device Role / Timing Role: Micropower flyback controller enabling always-on wake-up capability with 116µA sleep current. Use Value: Enables low-quiescent-current operation meeting ISO 16750-2 parasitic drain requirements (<50µA typical system sleep current). |
| Medical Patient Monitoring | Telecom Remote PHY Unit |
|
Use Scenario: 12V isolated bias supply for analog front-end amplifiers in portable ECG device with 3.6V Li-ion input. IC Role / Device Role / Timing Role: High-efficiency flyback controller supporting 3V–100V input range and delivering clean 12V output with <15mVpp ripple. Use Value: Meets IEC 60601-1 creepage/clearance requirements via reinforced isolation; achieves >85% efficiency at 100mA load. |
Use Scenario: 5V/2A isolated supply for remote PHY (R-PHY) digital signal processor in fiber-to-the-home (FTTH) node with 48V PoE input. IC Role / Device Role / Timing Role: Boundary-mode controller enabling compact 12mm × 12mm transformer solution with 24W output capability. Use Value: Supports high step-up ratio (e.g., 48V → 5V @ 2A) with LT8304-1 variant optimization - reduces transformer size by 30% vs. continuous conduction mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8304IS8E#TRPBF | Same architecture and pinout, but rated for –40°C to +125°C junction temperature (I-grade). | Suitable for commercial/industrial environments where ambient does not exceed 85°C; lower cost than H-grade. | Select when thermal margin allows - saves $0.32/unit at 1k volume; requires derating above 125°C junction. |
| LT8304-1HS8E#TRPBF | Optimized for high step-up ratios (≥5:1); features enhanced immunity to SW-node current ringing at light load/high VIN. | Preferred for 48V→5V or 72V→3.3V designs where reflected capacitance causes false current-limit triggering. | Choose for NPS ≥5:1 transformers - eliminates need for snubbers or blanking-time adjustments; identical footprint and biasing. |
Compared with LT8304IS8E#TRPBF, the LT8304HS8E#TRPBF offers extended thermal operation critical for under-hood or sealed enclosure use; compared with LT8304-1HS8E#TRPBF, it lacks high-ringing immunity but provides identical performance for moderate step-up (≤4:1) topologies.
Availability
LT8304HS8E#TRPBF is available at Aetrix Electronics and suitable for industrial auxiliary power, automotive body control modules, medical patient monitoring, and telecom remote PHY units requiring stable component supply with guaranteed long-term availability.
Supply support for LT8304HS8E#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and automotive safety markets.
The LT8304 product line delivers monolithic isolated flyback controllers with integrated high-voltage switches, targeting space-constrained, high-reliability auxiliary power applications where opto-isolator elimination and thermal robustness are essential.
FAQ
What is the maximum output power achievable with LT8304HS8E#TRPBF?
The LT8304HS8E#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 sustains 2.4A at 5V (12W) with >85% efficiency; peak 24W is achieved at higher VIN and optimized layout. Derating applies above 125°C junction temperature.
Does LT8304HS8E#TRPBF require an opto-isolator for regulation?
No, the LT8304HS8E#TRPBF does not require an opto-isolator. It regulates the isolated output voltage by sampling the primary-side flyback pulse waveform - a proprietary method that eliminates opto-isolators, third windings, and associated aging, nonlinearity, and dynamic response limitations inherent in traditional isolated flyback designs.
What is the purpose of the TC pin on LT8304HS8E#TRPBF?
Pin 8 (TC) on the LT8304HS8E#TRPBF provides a proportional-to-absolute-temperature (PTAT) voltage (1.00V at 25°C, +3.35mV/°C) used to compensate for the negative temperature coefficient of the output diode's forward voltage (VF). Connecting an RTC resistor between TC and RREF cancels VF drift, ensuring stable 3.3V/5V output regulation across –40°C to +150°C.
Can LT8304HS8E#TRPBF operate with input voltages below 3V?
No, the LT8304HS8E#TRPBF has a specified minimum input voltage of 3V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3V is not guaranteed - startup may fail, regulation accuracy degrades, and internal LDO (INTVCC) cannot maintain 3.0V output. For sub-3V inputs, consider discrete boost + isolated DC/DC architectures.
How does LT8304HS8E#TRPBF handle output short-circuit conditions?
The LT8304HS8E#TRPBF incorporates auto-recovery hiccup-mode short-circuit protection. When output current exceeds the 2.4A (typ) switch current limit, the controller shuts down for ~10ms, then attempts restart. This cycle repeats until fault clears - limiting average power dissipation, preventing thermal runaway, and protecting the internal 150V/2A DMOS switch and external transformer.
LT8304HS8E#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8304HS8E#TRPBF FAQ
1.How can I place an order for LT8304HS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8304HS8E#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 LT8304HS8E#TRPBF reliable?
The price and inventory of LT8304HS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8304HS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8304HS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8304HS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8304HS8E#TRPBF?
LT8304HS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8304HS8E#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 LT8304HS8E#TRPBF?
For technical support, including LT8304HS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8304HS8E#TRPBF requirements.
6.How does Aetrix verify that LT8304HS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8304HS8E#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 LT8304HS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8304HS8E#TRPBF?
All LT8304HS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8304HS8E#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 LT8304HS8E#TRPBF part is unused and in its original packaging.
Return procedure for LT8304HS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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