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Analog Devices Inc. LT8304IS8E#TRPBF
- Part No.:
- LT8304IS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8304IS8E#TRPBF.pdf
- Description:
- IC REG FLYBACK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:902
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Product details
Overview
LT8304IS8E#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 transformer 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 LT8304IS8E#TRPBF datasheet, LT8304IS8E#TRPBF pinout, LT8304IS8E#TRPBF application, or LT8304IS8E#TRPBF equivalent, key selection criteria include its 116µA sleep-mode quiescent current, 390µA active-mode IQ, 150V SW pin rating, quasi-resonant boundary mode operation, and thermally enhanced 8-lead SO package with exposed GND pad.
Technical Context
The LT8304IS8E#TRPBF implements current-mode control with a sample-and-hold error amplifier that captures the isolated output voltage during zero-secondary-current flyback events. Its boundary conduction mode detector enables valley-switching at heavy loads, while an internal frequency clamp limits max switching frequency to 350kHz to prevent excessive losses at light loads.
It integrates a 3V LDO (INTVCC), accurate 1.214V EN/UVLO threshold with 14mV hysteresis, 1.00V RREF reference with 0.1% line regulation, and PTAT TC pin (1V at 25°C, 3.35mV/°C) for output diode temperature compensation - all supporting stable regulation across –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 100V - supports wide-input industrial and telecom rails without external pre-regulation. |
| Integrated Switch | 150V/2A DMOS - eliminates external high-voltage MOSFET and reduces BOM count for <24W isolated outputs. |
| Quiescent Current | 116µA (sleep), 390µA (active) - enables ultra-low standby power in always-on isolated housekeeping supplies. |
| Switching Frequency | 8–385kHz (variable) - boundary mode at heavy load + clamped discontinuous mode at light load for efficiency optimization. |
| Output Regulation | No opto-isolator or third winding required - uses primary-side flyback pulse sampling for ±5% typical output accuracy. |
| Package | 8-Lead SO with exposed GND pad - θJA = 33°C/W thermal resistance enables >1.5W dissipation at 125°C ambient without heatsink. |
| Protection Features | Output short-circuit protection, INTVCC UVLO (2.47V), overtemperature shutdown - ensures robust operation under fault conditions. |
Pinout & Package
LT8304IS8E#TRPBF 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 Undervoltage Lockout Input | Pull below 0.2V to disable; 1.214V threshold with 14mV hysteresis enables precise VIN UVLO programming via resistor divider. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal logic and gate driver; must be bypassed with ≥1µF ceramic capacitor to GND - no external supply allowed. |
| VIN (Pin 3) | Main Input Supply | Supplies internal circuitry and serves as reference for RFB feedback network; requires local bulk and ceramic bypassing. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power and Signal Ground | Common return for all circuits; exposed pad is electrically and thermally connected to GND - mandatory PCB soldering required. |
| SW (Pin 5) | Drain of Integrated 150V/2A DMOS Switch | Connects to transformer primary; 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 information. |
| RREF (Pin 7) | Reference Resistor Input | Ground-referred node for RREF resistor; sets output voltage via ratio RFB/RREF × 1.00V reference - nominal value 10kΩ. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1V @ 25°C, 3.35mV/°C) used to offset output diode VF drift; connect RTC resistor to RREF for 3.3V/5V output stabilization. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates opto-isolator and third winding - reduces cost, size, and long-term drift in medical/industrial isolation barriers. |
| Low-ripple Burst Mode® | Maintains <15mVpp output ripple at light loads while achieving >80% efficiency down to 0.5% full-load - critical for noise-sensitive analog subsystems. |
| Boundary mode operation | Valley-switching at heavy loads improves efficiency and enables smaller magnetics vs. CCM - reduces transformer volume by ~30%. |
| Internal compensation & soft-start | Reduces external component count by 4–6 parts; 11ms soft-start prevents inrush current and transformer saturation during startup. |
| Output short-circuit protection | Auto-recovery hiccup mode limits average power during sustained shorts - protects transformer, diode, and IC without latch-off. |
Applications
| Industrial PLC Auxiliary Power | Medical Isolation Barrier Supply |
|---|---|
Use Scenario: Providing isolated 5V/2A housekeeping power to microcontrollers and I/O drivers in programmable logic controllers with 24V–48V DC input rails. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without opto-isolator, using boundary mode for stable load transient response. Use Value: Enables compact, low-component-count 5V auxiliary rail meeting IEC 61000-4-5 surge immunity and reinforced isolation requirements. | Use Scenario: Generating isolated 3.3V/1A power for patient-connected sensor front-ends in portable diagnostic equipment. IC Role / Device Role / Timing Role: Micropower flyback controller maintaining <116µA sleep current and tight output regulation across –20°C to +50°C ambient. Use Value: Supports battery-backed operation and meets IEC 60601-1 creepage/clearance and leakage current limits without external isolation components. |
| Telecom Remote PHY Power | Automotive Body Control Module |
Use Scenario: Delivering isolated 12V/1.5A power to remote PHY units in fiber-to-the-home (FTTH) nodes with 48V PoE-derived input. IC Role / Device Role / Timing Role: High-input-voltage flyback controller operating up to 100VIN, using low-ripple Burst Mode to minimize conducted EMI in RF-sensitive environments. Use Value: Achieves >85% efficiency at full load and <10mVpp ripple - avoids interference with downstream DOCSIS signal processing. | Use Scenario: Supplying isolated 5V power to CAN transceivers and EEPROMs in automotive body control modules with 9V–16V battery input. IC Role / Device Role / Timing Role: Automotive-grade (–40°C to 125°C) flyback controller with accurate EN/UVLO (1.214V) and robust SW pin rating (150V). Use Value: Withstands load-dump transients up to 120V and maintains regulation during cold-crank (4.5V), ensuring CAN bus uptime. |
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#TRPBF | Same architecture and pinout; rated for 0°C to 125°C junction (vs. –40°C to 125°C for LT8304IS8E#TRPBF) | Suitable for commercial/industrial environments without extended low-temp operation | Select when ambient operating temperature stays above 0°C and cost sensitivity outweighs extended temp range. |
| LT8304-1IS8E#TRPBF | Optimized for high step-up ratios (≥5:1); longer blanking time immune to SW node ringing at light load/high VIN | Required for 24V→120V or 48V→240V isolated outputs where LT8304IS8E#TRPBF may oscillate | Choose for NPS ≥5:1 transformers; otherwise LT8304IS8E#TRPBF offers identical performance at lower cost. |
Compared with LT8304ES8E#TRPBF, the LT8304IS8E#TRPBF extends guaranteed operation to –40°C, critical for outdoor or automotive use; compared with LT8304-1IS8E#TRPBF, it lacks enhanced ringing immunity but delivers identical regulation accuracy and efficiency for standard 1:1–4:1 step-up designs.
Availability
LT8304IS8E#TRPBF is available at Aetrix Electronics and suitable for industrial PLC auxiliary power, medical isolation barrier supplies, telecom remote PHY power, and automotive body control modules requiring stable component supply across extended temperature ranges.
Supply support for LT8304IS8E#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.
The LT8304 product line delivers micropower isolated flyback controllers optimized for compact, low-BOM-count auxiliary power supplies in safety-critical and space-constrained applications.
FAQ
What is the maximum output power achievable with LT8304IS8E#TRPBF?
The LT8304IS8E#TRPBF delivers up to 24W of isolated output power depending on input voltage, transformer turns ratio, and efficiency. At VIN = 72V with a 6:1 transformer and 85% efficiency, it sustains 4.2A at 5V output. The integrated 2A/150V switch and boundary mode operation enable this power level in an 8-lead SO package without external MOSFETs.
Does LT8304IS8E#TRPBF require an opto-isolator or third transformer winding?
No, the LT8304IS8E#TRPBF does not require an opto-isolator or third winding. It samples the isolated output voltage directly from the primary-side flyback waveform during zero-secondary-current events, enabling regulation with only two external resistors (RFB and RREF) - reducing cost, size, and long-term drift.
How does the TC pin function in LT8304IS8E#TRPBF?
The TC pin on the LT8304IS8E#TRPBF provides a PTAT voltage (1V at 25°C, 3.35mV/°C) used to compensate for the negative temperature coefficient of the output diode (–1 to –2mV/°C). Connecting an RTC resistor between TC and RREF injects temperature-proportional current into RREF, stabilizing 3.3V/5V outputs across –40°C to 125°C.
What is the purpose of the EN/UVLO pin on LT8304IS8E#TRPBF?
EN/UVLO (Pin 1) on the LT8304IS8E#TRPBF serves dual functions: pulling it below 0.2V disables the IC (sleep mode, IQ = 116µA), and configuring a resistor divider from VIN to GND sets a precise undervoltage lockout threshold (1.214V typical, 14mV hysteresis) to prevent operation during brownout conditions.
Can LT8304IS8E#TRPBF operate with input voltages below 3V?
No, the LT8304IS8E#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 3V output, risking control circuit malfunction.
LT8304IS8E#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
LT8304IS8E#TRPBF FAQ
1.How can I place an order for LT8304IS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8304IS8E#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 LT8304IS8E#TRPBF reliable?
The price and inventory of LT8304IS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8304IS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8304IS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8304IS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8304IS8E#TRPBF?
LT8304IS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8304IS8E#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 LT8304IS8E#TRPBF?
For technical support, including LT8304IS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8304IS8E#TRPBF requirements.
6.How does Aetrix verify that LT8304IS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8304IS8E#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 LT8304IS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8304IS8E#TRPBF?
All LT8304IS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8304IS8E#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 LT8304IS8E#TRPBF part is unused and in its original packaging.
Return procedure for LT8304IS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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