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Analog Devices Inc. LT8304IS8E#PBF
- Part No.:
- LT8304IS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8304IS8E#PBF.pdf
- Description:
- IC REG FLYBACK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,201
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Product details
Overview
LT8304IS8E#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 enables opto-isolator–free regulation via primary-side flyback pulse sampling, supports boundary mode for tight load regulation, and features low-ripple Burst Mode operation for >85% efficiency at light loads - ideal for auxiliary power in industrial PLCs and telecom interface cards.
For engineers reviewing the LT8304IS8E#PBF datasheet, LT8304IS8E#PBF pinout, LT8304IS8E#PBF application, or LT8304IS8E#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, ±5% output voltage accuracy with temperature compensation, and compatibility with 3.3V–24V isolated outputs using external RFB/RREF resistors.
Technical Context
The LT8304IS8E#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 error from parasitic resistance and enable compact magnetics. Its sample-and-hold error amplifier captures the isolated output voltage directly from the flyback pulse amplitude, eliminating need for third winding or opto-coupler.
At light loads, it transitions to low-ripple Burst Mode operation with 11kHz minimum switching frequency, maintaining high efficiency while limiting output voltage ripple to <50mVpp. Internal 1.00V RREF reference, 3.35mV/°C PTAT TC pin, and programmable EN/UVLO threshold (1.214V typ) support stable startup and diode temperature compensation across –40°C to 125°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 100V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Integrated Switch | 150V/2A DMOS - handles 110V reflected flyback spikes with 40V margin; eliminates external high-voltage MOSFET. |
| Quiescent Current | 116µA in Sleep Mode - enables >1-year battery life in always-on isolated monitoring circuits. |
| Output Regulation | ±5% typical accuracy with RFB/RREF programming - no opto-isolator or third winding required; simplifies transformer design. |
| Switching Frequency | 8–385kHz variable range - boundary mode at full load; clamped max frequency prevents MHz-range losses at light loads. |
| Thermal Rating | –40°C to 125°C operating junction - qualified for industrial control and telecom infrastructure environments. |
| Package | 8-Lead SO with exposed GND pad - θJA = 33°C/W; requires PCB thermal pad connection for reliable 24W operation. |
Pinout & Package
LT8304IS8E#PBF is housed in an 8-lead plastic SO package (S8E) with exposed GND pad (Pin 9), which must be soldered to the PCB ground plane 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 | Pull below 0.2V to shut down; 1.214V threshold enables precise VIN UVLO programming with resistor divider. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal logic and gate driver; requires ≥1µF ceramic bypass to GND; not for external supply injection. |
| VIN (Pin 3) | Main Input Supply | Supplies internal circuitry and serves as reference for RFB feedback path; bypass locally with bulk + ceramic capacitors. |
| GND (Pin 4 & Exposed Pad Pin 9) | Power and Signal Ground Reference | Exposes thermal path to PCB; must be soldered to solid ground plane to maintain TJ ≤ 125°C at full load. |
| SW (Pin 5) | Drain of Integrated 150V/2A DMOS Switch | Connects to transformer primary; minimize trace area to reduce EMI and voltage overshoot from leakage inductance. |
| RFB (Pin 6) | Feedback Voltage Sampling Input | Connected to SW node via resistor; converts flyback pulse amplitude into current for output voltage sensing. |
| RREF (Pin 7) | Reference Resistor Terminal | Ground-referenced node where RREF sets gain; internal 1.00V reference ensures accurate VOUT = 1.00V × (RFB/RREF) × (1/NPS) – VF. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1.00V at 25°C, +3.35mV/°C) used to offset diode VF drift; connect RTC between TC and RREF for 3.3V/5V outputs. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates opto-isolator and third winding - reduces BOM count by ≥4 components and improves long-term reliability vs. aging LEDs. |
| Boundary conduction mode | Zero-current switching at SW valley enables <±2% load regulation without secondary-side compensation networks. |
| Low-ripple Burst Mode | Maintains <50mVpp output ripple at 1% load while achieving >80% efficiency - critical for noise-sensitive analog sensor interfaces. |
| Internal soft-start & compensation | 11ms built-in soft-start prevents inrush; fully integrated loop compensation removes need for external Type II/III networks. |
| Output short-circuit protection | Auto-recovery hiccup mode limits average power during sustained short - protects transformer and output diode without latch-off. |
Applications
| Industrial PLC Auxiliary Power | Telecom Interface Isolation |
|---|---|
Use Scenario: Providing isolated 5V/2A housekeeping power to I/O modules in programmable logic controllers with 24VDC or 48VDC backplane inputs. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output via sampled SW node waveform; no secondary feedback path required. Use Value: Reduces transformer complexity and eliminates opto-isolator drift, enabling ±3% output stability over –40°C to 75°C ambient without recalibration. |
Use Scenario: Generating isolated 3.3V bias for RS-485 transceivers and Ethernet PHYs in carrier-grade access equipment powered from –48VDC telecom supplies. IC Role / Device Role / Timing Role: Micropower flyback controller operating in Burst Mode to maintain <100µA no-load input current while supporting 100mA burst loads. Use Value: Achieves >85% efficiency at 10% load and meets EN 55022 Class B conducted emissions with minimal filtering due to valley-switching EMI profile. |
| Medical Sensor Isolation | Automotive Body Control Module |
Use Scenario: Delivering reinforced-isolation 5V power to patient-connected analog front-ends (ECG, EEG) in portable diagnostic devices with single-cell Li-ion or USB-C input. IC Role / Device Role / Timing Role: Isolated flyback controller with TC pin compensation ensuring <±20mV output shift from –20°C to +50°C - critical for ADC reference stability. Use Value: Enables 10-year battery life in standby via 116µA sleep current and eliminates opto-isolator lifetime uncertainty per IEC 60601-1. |
Use Scenario: Generating isolated 12V/1A supply for CAN transceiver and microcontroller domains in 12V/24V vehicle body control units with cold-crank (4.5V) and load-dump (60V) tolerance. IC Role / Device Role / Timing Role: High-input flyback controller with 100V absolute max VIN rating and programmable UVLO hysteresis for robust start-up under battery transients. Use Value: Supports direct connection to vehicle battery without external TVS or pre-regulator; maintains regulation during 15ms 60V load-dump events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8304ES8E#PBF | Same silicon, rated for 0°C to 125°C junction (vs. –40°C to 125°C for LT8304IS8E#PBF); lower temperature grade screening. | Suitable for commercial/industrial environments without extended cold-start requirements. | Select LT8304IS8E#PBF for designs requiring guaranteed operation at –40°C ambient (e.g., outdoor telecom, automotive). |
| LT8304HS8E#PBF | Same silicon, rated for –40°C to 150°C junction; higher thermal stress capability with same package. | Required for high-ambient applications like engine bay power supplies or enclosed industrial drives. | Choose LT8304HS8E#PBF only if board-level thermal modeling confirms TJ > 125°C under worst-case load/ambient. |
Compared with LT8304ES8E#PBF and LT8304HS8E#PBF, the LT8304IS8E#PBF provides the optimal balance of extended low-temperature performance and cost for general-purpose industrial isolation, avoiding over-specification while guaranteeing –40°C startup and regulation.
Availability
LT8304IS8E#PBF is available at Aetrix Electronics and suitable for industrial PLC auxiliary power, telecom interface isolation, medical sensor isolation, and automotive body control module applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8304IS8E#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, serving industrial, automotive, communications, and healthcare markets.
The LT8304 product line delivers micropower isolated flyback controllers optimized for simplicity, reliability, and wide-input operation - designed specifically to replace opto-isolated solutions in space- and cost-constrained embedded power systems.
FAQ
What is the maximum isolated output power achievable with LT8304IS8E#PBF?
The LT8304IS8E#PBF delivers up to 24W of isolated output power, validated across 3V–100V input range with appropriate transformer design. At 24V input, typical output is 5V/2.4A (12W); at 72V input, it supports 5V/4.2A (21W). Maximum power depends on transformer turns ratio, layout thermal management, and efficiency target - e.g., a 6:1 ratio yields 19W at 75V input assuming 85% efficiency.
Does LT8304IS8E#PBF require an opto-isolator or third transformer winding?
No. The LT8304IS8E#PBF uses primary-side flyback pulse sampling to regulate the isolated output voltage, eliminating both opto-isolators and third windings. This is achieved via internal sample-and-hold circuitry that reads the SW node voltage amplitude during zero-secondary-current intervals, enabling ±5% output accuracy without secondary feedback components.
How does the TC pin on LT8304IS8E#PBF improve output voltage stability?
The TC pin on LT8304IS8E#PBF provides a proportional-to-absolute-temperature (PTAT) voltage (1.00V at 25°C, +3.35mV/°C) to compensate for the negative temperature coefficient of the output diode (–1 to –2mV/°C). By connecting an RTC resistor between TC and RREF pins, a PTAT current offsets diode VF drift - reducing output variation from ±300mV to <±20mV across –40°C to 125°C for 5V outputs.
What is the minimum load requirement for stable regulation with LT8304IS8E#PBF?
The LT8304IS8E#PBF maintains regulation down to <0.5% of full output load (e.g., 10mA for a 2A design) thanks to low-ripple Burst Mode operation. Below this threshold, the controller cycles between active and sleep modes while preserving output voltage accuracy and minimizing input current - enabling efficient operation in always-on sensor nodes and standby circuits.
Can LT8304IS8E#PBF be used in automotive applications with cold-crank conditions?
Yes. The LT8304IS8E#PBF operates from 3V to 100V input and includes programmable EN/UVLO with 1.214V threshold and 14mV hysteresis, allowing robust startup during automotive cold-crank (down to 3V) and load-dump (up to 60V) events. Its –40°C to 125°C junction rating and integrated 150V switch make it suitable for body control modules without external protection circuitry.
LT8304IS8E#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
LT8304IS8E#PBF FAQ
1.How can I place an order for LT8304IS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8304IS8E#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 LT8304IS8E#PBF reliable?
The price and inventory of LT8304IS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8304IS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT8304IS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8304IS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8304IS8E#PBF?
LT8304IS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8304IS8E#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 LT8304IS8E#PBF?
For technical support, including LT8304IS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8304IS8E#PBF requirements.
6.How does Aetrix verify that LT8304IS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8304IS8E#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 LT8304IS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT8304IS8E#PBF?
All LT8304IS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8304IS8E#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 LT8304IS8E#PBF part is unused and in its original packaging.
Return procedure for LT8304IS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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