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Analog Devices Inc. LT8304ES8E#PBF
- Part No.:
- LT8304ES8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8304ES8E#PBF.pdf
- Description:
- IC REG FLYBACK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,982
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Product details
Overview
LT8304ES8E#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 eliminates opto-isolators and third-winding feedback via primary-side flyback pulse sampling, supports boundary mode for tight load regulation, and features low-ripple Burst Mode operation for high light-load efficiency in auxiliary/housekeeping power supplies.
For engineers reviewing the LT8304ES8E#PBF datasheet, LT8304ES8E#PBF pinout, LT8304ES8E#PBF application, or LT8304ES8E#PBF equivalent, key selection criteria include its 116µA sleep-mode quiescent current, 150V SW pin rating, thermally enhanced 8-lead SO package with exposed GND pad, and compatibility with transformer turns ratios ≥6:1 for 5V outputs at 24–72V input.
Technical Context
The LT8304ES8E#PBF implements quasi-resonant boundary conduction mode at heavy loads-turning on the internal switch at the valley of SW node ringing when secondary current reaches zero-to achieve excellent load regulation without secondary-side sensing. Its sample-and-hold error amplifier captures the isolated output voltage directly from the flyback pulse amplitude, referenced to an internal 1.00V RREF regulation voltage.
At light loads, it transitions to low-ripple Burst Mode operation with minimum 11kHz switching frequency, maintaining high efficiency while preserving accurate output voltage sampling. The device integrates internal compensation, soft-start, EN/UVLO with 1.214V enable threshold and 14mV hysteresis, and temperature-compensated output voltage control via TC pin (3.35mV/°C PTAT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 100V - supports wide-input industrial, telecom, and automotive auxiliary rails without external pre-regulation. |
| Integrated Switch | 150V/2A DMOS - enables compact isolated flyback designs up to 24W without external MOSFET or driver. |
| Quiescent Current | 116µA (sleep), 390µA (active) - minimizes standby power loss in always-on systems. |
| Output Regulation | No opto-isolator or third winding required - reduces BOM count, cost, and layout complexity while improving reliability. |
| 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. |
| Package | 8-Lead SO with exposed GND pad - provides enhanced thermal dissipation (θJA = 33°C/W) for high-power density layouts. |
| Operating Temp | –40°C to +125°C junction - qualified for industrial and automotive under-hood auxiliary supply applications. |
Pinout & Package
LT8304ES8E#PBF is housed in an 8-lead plastic SO package (S8E) with exposed GND pad (Pin 9), requiring soldering to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input UVLO input | Pull below 0.2V to shut down; 1.214V threshold enables precise VIN undervoltage lockout 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 internal logic and gate driver; serves as reference for RFB feedback network. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power and signal ground | Exposure pad is electrically and thermally connected to GND-mandatory soldering to PCB ground plane. |
| SW (Pin 5) | Drain of internal 150V/2A DMOS switch | Connects to transformer primary; minimize trace area to reduce EMI and voltage spikes. |
| RFB (Pin 6) | Feedback sense input | Connected 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 value 10kΩ for 1.00V internal reference. |
| TC (Pin 8) | Temperature compensation output | PTAT voltage (3.35mV/°C) used with RTC resistor to cancel output diode forward-voltage drift. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates opto-isolator and third winding-reduces component count, cost, and long-term drift issues. |
| Boundary mode operation | Enables zero-current switching at SW node valley for high efficiency and tight load regulation without secondary sensing. |
| Low-ripple Burst Mode | Maintains <15mVpp output ripple at light loads while achieving >85% efficiency down to 0.5% full-load. |
| Integrated soft-start & compensation | Reduces external component count by embedding loop compensation and 11ms soft-start timer. |
| Output short-circuit protection | Auto-recovery fault handling prevents latch-up during transient overloads in unattended systems. |
Applications
| Industrial Auxiliary Power | Automotive Housekeeping Supply |
|---|---|
Use Scenario: Isolated 5V/2A auxiliary rail powering CAN transceivers, microcontrollers, and sensors in PLC backplanes with 24–48V DC input. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without optocoupler, using boundary mode for stable load step response. Use Value: Enables compact, high-reliability 5V housekeeping supply meeting IEC 61000-4-5 surge immunity requirements with <12mm creepage. | Use Scenario: 12V-to-5V isolated auxiliary supply for infotainment head unit MCU and display backlight drivers in 12V/24V vehicle architectures. IC Role / Device Role / Timing Role: Micropower flyback controller delivering regulated 5V at up to 2.4A from 12V battery input with cold-crank support down to 3V. Use Value: Achieves 116µA shutdown current to meet ISO 16750-2 quiescent drain limits while sustaining 100% load at 105°C ambient. |
| Medical Isolated Sensor Bias | Telecom Remote PHY Power |
Use Scenario: 3.3V/1A isolated bias rail for analog front-end sensors in patient-connected diagnostic equipment requiring 4kV reinforced isolation. IC Role / Device Role / Timing Role: No-opto flyback controller implementing temperature-compensated output via TC/RREF network to hold ±1.5% regulation over –25°C to +75°C. Use Value: Use Value: Eliminates optocoupler aging and nonlinearities-ensuring long-term accuracy critical for FDA Class II medical device certification. | Use Scenario: 48V-to-12V isolated supply for remote PHY modules in fiber-to-the-home (FTTH) ONT units with strict EMI Class B compliance. IC Role / Device Role / Timing Role: High-efficiency flyback controller operating in low-ripple Burst Mode to maintain <10mVpp output noise at 10mA load while passing CISPR-32 conducted emissions. Use Value: Reduces need for post-regulation LDOs-cutting BoM cost and thermal footprint in space-constrained ONT enclosures. |
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 silicon, rated for –40°C to +125°C operating junction temperature (same as LT8304ES8E#PBF); identical electrical specs and pinout. | No functional difference-intended for same industrial applications; differs only in test screening grade (I-grade vs E-grade). | Select LT8304IS8E#PBF if extended production lot traceability or AEC-Q200-aligned qualification is required. |
| LT8304HS8E#PBF | Same functionality, rated for –40°C to +150°C junction temperature; higher thermal robustness but identical electrical performance. | Suitable for under-hood automotive or high-ambient industrial environments exceeding 125°C junction temp. | Choose LT8304HS8E#PBF only when sustained operation above 125°C junction is verified in thermal simulation or testing. |
Compared with LT8304ES8E#PBF, the I-grade variant offers identical performance with enhanced production screening, while the H-grade extends maximum junction temperature to +150°C-both retain the same 150V/2A switch, boundary/Burst Mode operation, and no-opto regulation architecture.
Availability
LT8304ES8E#PBF is available at Aetrix Electronics and suitable for industrial auxiliary power, automotive housekeeping supplies, and medical isolated sensor bias applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LT8304ES8E#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 and maintains full product support, documentation, and manufacturing continuity for the LT series.
The LT8304 product line delivers micropower isolated flyback controllers optimized for no-opto, high-voltage input applications in space-constrained industrial, automotive, and medical systems-enabling compact, reliable auxiliary power without secondary-side feedback components.
FAQ
What is the maximum input voltage supported by the LT8304ES8E#PBF?
The LT8304ES8E#PBF supports an absolute maximum input voltage of 100V on the VIN pin, with continuous operation specified from 3V to 100V. The internal 150V-rated DMOS switch allows safe operation with reflected flyback spikes up to 110V, leaving 40V margin for leakage inductance overshoot-critical for high-step-up designs like 48V-to-5V conversion.
Does the LT8304ES8E#PBF require an opto-isolator for regulation?
No, the LT8304ES8E#PBF does not require an opto-isolator. It achieves precise isolated output regulation by sampling the flyback pulse amplitude directly at the SW pin during zero-secondary-current intervals-eliminating opto-isolator aging, nonlinearity, and dynamic response limitations while reducing BOM count and cost.
How is output voltage programmed on the LT8304ES8E#PBF?
Output voltage on the LT8304ES8E#PBF is set using two external resistors: RFB connected between SW and RFB pin, and RREF connected between RREF pin and GND. With internal 1.00V reference, VOUT ≈ (RFB/RREF) × (1/NPS) × 1.00V – VF, where NPS is transformer turns ratio and VF is output diode forward voltage. An optional RTC resistor between TC and RREF adds temperature compensation.
What thermal considerations apply to the LT8304ES8E#PBF package?
The LT8304ES8E#PBF uses an 8-lead SO package with exposed GND pad (Pin 9), which must be soldered to a PCB ground plane to achieve θJA = 33°C/W. Without proper pad soldering, thermal resistance increases significantly-risking junction temperature exceedance beyond the 125°C max rating during 24W operation. Thermal vias under the pad are strongly recommended.
Can the LT8304ES8E#PBF be used in high step-up ratio applications like 72V-to-5V?
Yes, the LT8304ES8E#PBF supports high step-up applications such as 72V-to-5V with appropriate transformer design (e.g., 12:1 or 14:1 turns ratio). However, for ratios ≥5:1, Analog Devices recommends the LT8304-1 variant (e.g., LT8304ES8E-1#PBF) due to enhanced immunity to SW node current ringing-critical for stability at high VIN and light loads.
LT8304ES8E#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8304ES8E#PBF FAQ
1.How can I place an order for LT8304ES8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8304ES8E#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 LT8304ES8E#PBF reliable?
The price and inventory of LT8304ES8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8304ES8E#PBF is usually 5 days.
3.What payment methods are accepted for LT8304ES8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8304ES8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8304ES8E#PBF?
LT8304ES8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8304ES8E#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 LT8304ES8E#PBF?
For technical support, including LT8304ES8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8304ES8E#PBF requirements.
6.How does Aetrix verify that LT8304ES8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8304ES8E#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 LT8304ES8E#PBF meets industry standards.
7.What is the process for return or replacement of LT8304ES8E#PBF?
All LT8304ES8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8304ES8E#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 LT8304ES8E#PBF part is unused and in its original packaging.
Return procedure for LT8304ES8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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