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Analog Devices Inc. LT8304HS8E#PBF
- Part No.:
- LT8304HS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8304HS8E#PBF.pdf
- Description:
- IC REG FLYBACK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:278
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Product details
Overview
LT8304HS8E#PBF 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 uses primary-side sensing-no opto-isolator or third winding-and supports boundary mode for tight load regulation and low-ripple Burst Mode® for high light-load efficiency in industrial auxiliary power supplies.
For engineers reviewing the LT8304HS8E#PBF datasheet, LT8304HS8E#PBF pinout, LT8304HS8E#PBF application, or LT8304HS8E#PBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, 116µA sleep-mode quiescent current, 150V SW pin rating, no-opto regulation architecture, and thermally enhanced 8-lead SO package with exposed GND pad.
Technical Context
The LT8304HS8E#PBF implements quasi-resonant boundary conduction mode at heavy loads-turning on the internal switch at the SW node valley when secondary current reaches zero-to eliminate load-regulation errors from parasitic resistances and enable compact magnetics. Its sample-and-hold error amplifier directly measures the isolated output voltage via the flyback pulse amplitude on the SW pin, eliminating need for secondary-side feedback components.
At light loads, it transitions to low-ripple Burst Mode® operation with minimum 11kHz switching frequency, maintaining high efficiency while ensuring sufficient sampling intervals for stable regulation. The device integrates internal compensation, soft-start, EN/UVLO with 1.214V threshold and 14mV hysteresis, and temperature-compensated output voltage control via the TC pin (1V at 25°C, 3.35mV/°C PTAT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 100V - supports wide-input industrial, automotive, and telecom supply rails without external pre-regulation. |
| Switch Rating | 150V DMOS, 2A max - enables high-voltage flyback topologies with up to 110V switch stress plus 40V leakage margin. |
| Quiescent Current | 116µA sleep mode - minimizes standby power loss in always-on isolated housekeeping supplies. |
| Output Power | Up to 24W - achievable with optimized transformer turns ratio (e.g., 6:1 for 5V out at 72V in) and 85% typical efficiency. |
| Junction Temp Range | –40°C to +150°C - qualified for high-reliability underhood, motor drive, and industrial control environments. |
| Regulation Method | No-opto primary-side sensing - eliminates optocoupler aging, nonlinearity, and third-winding complexity. |
| Switching Frequency | 8–385 kHz variable - dynamically adjusts between boundary mode (heavy load) and clamped DCM/Burst Mode (light load). |
Pinout & Package
LT8304HS8E#PBF is housed in an 8-lead plastic SO package (S8E) with exposed thermal pad (Pin 9), rated for θJA = 33°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input UVLO Input | Pull <0.2V to shut down; 1.214V threshold with 14mV hysteresis enables precise VIN lockout programming. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal logic; 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. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power & Signal Ground | Common return for all circuits; exposed pad provides primary thermal path and must be soldered to PCB ground plane. |
| SW (Pin 5) | Drain of Internal 150V/2A Switch | Connects to transformer primary; high dv/dt node-minimize trace area to reduce EMI and ringing. |
| RFB (Pin 6) | Feedback Sense 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 internal 1.00V reference scaling; nominal value 10kΩ. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1V @ 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 optocoupler and third winding-reduces BOM count, cost, and long-term drift in medical/industrial isolation barriers. |
| Boundary conduction mode | Zero-current switching at SW valley ensures consistent energy transfer and <0.5% minimum load requirement. |
| Low-ripple Burst Mode® | Maintains <15mVPP output ripple at light loads while achieving >80% efficiency at 1% full load. |
| Integrated 150V/2A DMOS switch | Enables single-chip 100V-input flyback designs without external high-voltage MOSFET or driver. |
| Temperature-compensated output | TC pin enables ±1% output voltage stability over –40°C to +125°C for 5V/3.3V outputs using optional RTC resistor. |
Applications
| Industrial Auxiliary Power | Automotive Body Control |
|---|---|
Use Scenario: Isolated 5V/1A housekeeping supply for PLC I/O modules powered from 24V–72V DC bus. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without secondary feedback components. Use Value: Reduces component count by 4–6 parts vs. opto-coupled design; maintains ±2% output accuracy across –40°C to +85°C ambient. | Use Scenario: 3.3V/500mA isolated supply for CAN transceiver and microcontroller in engine bay ECU. IC Role / Device Role / Timing Role: High-temp-rated flyback controller providing reinforced isolation for safety-critical subsystems. Use Value: 150°C junction rating enables direct mounting near heat sources; 116µA sleep current extends battery life during vehicle off-state. |
| Medical Sensor Interface | Telecom Remote PHY |
Use Scenario: 12V/2A isolated bias supply for analog front-end amplifiers in portable ultrasound probe. IC Role / Device Role / Timing Role: Micropower flyback controller delivering low-noise, ripple-controlled output for sensitive signal chains. Use Value: Low-ripple Burst Mode® limits conducted EMI into analog sections; boundary mode ensures stable regulation under dynamic sensor loading. | Use Scenario: 5V/3A isolated supply for remote PHY chipsets in fiber-to-the-home (FTTH) ONT units with 48V PoE input. IC Role / Device Role / Timing Role: High-efficiency flyback controller supporting wide-input telecom rectified bus with minimal heatsinking. Use Value: 24W capability at 72V input enables single-stage conversion; integrated soft-start prevents inrush-induced upstream brownouts. |
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#PBF | Same functionality but rated for –40°C to +125°C junction temperature; lower max temp grade. | Suitable for commercial/industrial environments without underhood or high-ambient thermal stress. | Select when 150°C operation is unnecessary-offers cost and availability advantages in standard temp applications. |
| UCC28911DR | TI part with 700V integrated MOSFET, fixed 50kHz frequency, no TC pin or boundary mode; higher IQ (250µA active). | Targeted at universal AC input (85–265VAC) offline flyback, not wide-DC-input isolated supplies. | Choose only for AC/DC applications requiring higher breakdown voltage; not drop-in compatible due to different control architecture and pinout. |
Compared with LT8304IS8E#PBF, the LT8304HS8E#PBF delivers extended thermal reliability for harsh environments, while UCC28911DR serves fundamentally different AC-input use cases and lacks primary-side temperature compensation-making LT8304HS8E#PBF the sole fit for high-accuracy, wide-DC-input, no-opto isolated power in demanding thermal conditions.
Availability
LT8304HS8E#PBF is available at Aetrix Electronics and suitable for industrial auxiliary power, automotive body control, and medical sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8304HS8E#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT8304 product line delivers micropower, no-opto isolated flyback controllers optimized for wide-input DC-DC conversion in space-constrained, thermally demanding applications such as industrial automation and automotive subsystems.
FAQ
What is the maximum continuous input voltage supported by the LT8304HS8E#PBF?
The LT8304HS8E#PBF supports a continuous input voltage range of 3V to 100V. Its SW pin is rated for 150V transients, allowing safe operation with up to 110V switch stress plus 40V margin for leakage inductance spikes-critical for robustness in 72V automotive and industrial bus applications. This rating is validated across its full –40°C to +150°C junction temperature range.
How does the LT8304HS8E#PBF achieve regulation without an optocoupler or third winding?
The LT8304HS8E#PBF samples the isolated output voltage directly from the primary-side flyback pulse waveform at the SW pin. When the secondary current reaches zero, the flyback voltage amplitude equals (VOUT + VF) × NPS, which the internal circuit converts to a current through RFB and compares against the 1.00V RREF reference-enabling precise no-opto regulation without secondary-side components or additional transformer windings.
What is the purpose of the TC pin on the LT8304HS8E#PBF, and how is it used?
Pin 8 (TC) on the LT8304HS8E#PBF provides a proportional-to-absolute-temperature (PTAT) voltage-1.00V at 25°C with 3.35mV/°C coefficient-to compensate for the negative temperature coefficient of the output diode's forward voltage (VF). By connecting an RTC resistor between TC and RREF pins, a PTAT current offsets VF drift, enabling ±1% output voltage stability over temperature for low-voltage outputs like 3.3V and 5V.
Does the LT8304HS8E#PBF require external loop compensation components?
No, the LT8304HS8E#PBF integrates all loop compensation circuitry internally. Its no-opto architecture, combined with built-in soft-start and boundary-mode control logic, eliminates the need for external compensation networks-reducing design complexity and component count while ensuring stable regulation across line, load, and temperature variations without tuning.
What is the minimum load requirement for stable regulation with the LT8304HS8E#PBF?
The LT8304HS8E#PBF maintains stable regulation down to less than 0.5% of full output load-enabled by its boundary conduction mode architecture and accurate primary-side sampling. This ultra-low minimum load supports applications such as always-on auxiliary supplies where standby current must remain minimal without compromising output accuracy or causing burst-mode instability.
LT8304HS8E#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:
- 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#PBF FAQ
1.How can I place an order for LT8304HS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8304HS8E#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 LT8304HS8E#PBF reliable?
The price and inventory of LT8304HS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8304HS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT8304HS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8304HS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8304HS8E#PBF?
LT8304HS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8304HS8E#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 LT8304HS8E#PBF?
For technical support, including LT8304HS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8304HS8E#PBF requirements.
6.How does Aetrix verify that LT8304HS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8304HS8E#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 LT8304HS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT8304HS8E#PBF?
All LT8304HS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8304HS8E#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 LT8304HS8E#PBF part is unused and in its original packaging.
Return procedure for LT8304HS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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