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Analog Devices Inc. LT8304HS8E-1#TRPBF
- Part No.:
- LT8304HS8E-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8304HS8E-1#TRPBF.pdf
- Description:
- IC REG FLYBACK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,899
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Product details
Overview
LT8304HS8E-1#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 waveform sampling, supports boundary mode and low-ripple Burst Mode® operation, and targets high step-up output applications such as 4V–80VIN/5VOUT auxiliary supplies in industrial and automotive systems.
For engineers reviewing the LT8304HS8E-1#TRPBF datasheet, LT8304HS8E-1#TRPBF pinout, LT8304HS8E-1#TRPBF application, or LT8304HS8E-1#TRPBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, 116µA sleep-mode quiescent current, 315–385kHz switching frequency range, 950ns minimum on-time (LT8304-1 variant), and thermal-enhanced 8-lead SO package with exposed GND pad.
Technical Context
The LT8304HS8E-1#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 excellent load regulation without third-winding compensation. Its sample-and-hold error amplifier derives isolated output voltage feedback directly from the primary-side flyback pulse amplitude, eliminating opto-isolators and reducing component count.
At light loads, it transitions to low-ripple Burst Mode® operation with 11kHz minimum frequency, maintaining high efficiency while limiting output voltage ripple; the LT8304-1 variant includes enhanced immunity to primary-side current ringing in high step-up (≥5:1 turns ratio) configurations, enabling stable operation under high-VIN/light-load conditions where standard LT8304 may oscillate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 100V - supports wide-input industrial, telecom, and automotive supply rails without external pre-regulation. |
| Switch Rating | 150V DMOS, 2A max - handles reflected output voltages up to 110V with 40V margin for leakage spikes in flyback designs. |
| Quiescent Current | 116µA sleep mode - enables ultra-low standby power in always-on isolated auxiliary supplies. |
| Switching Frequency | 315–385kHz max - balances transformer size, EMI, and efficiency in compact isolated converters. |
| Min On-Time | 950ns (LT8304-1) - ensures reliable operation in high step-up ratios (e.g., 6:1) where duty cycle is very small. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Output Power | Up to 24W - achievable with optimized transformer and layout; typical 5V/2.4A at 24VIN, 5V/3.6A at 48VIN. |
Pinout & Package
LT8304HS8E-1#TRPBF uses a thermally enhanced 8-lead plastic SO package (S8E) with exposed GND pad (Pin 9) that must be soldered to PCB for thermal and electrical integrity. θJA = 33°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / UVLO input | Shuts down device below 0.2V; enables at 1.214V threshold with 14mV hysteresis - allows precise input undervoltage lockout programming. |
| INTVCC (Pin 2) | Internal 3V LDO output | Powers internal circuitry; requires ≥1µF local ceramic bypass - must not be externally driven. |
| VIN (Pin 3) | Main input supply | Supplies control logic and serves as reference for RFB feedback network - needs local bulk + ceramic decoupling. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power and signal ground | Common return for all circuits; exposed pad provides critical thermal path - must be solidly connected to PCB ground plane. |
| SW (Pin 5) | Drain of internal 150V/2A DMOS | Connects to primary winding; high dv/dt node - minimize trace area to reduce EMI and voltage overshoot. |
| RFB (Pin 6) | Feedback sense input | Connects to SW node via resistor; samples flyback pulse amplitude - determines output voltage with RREF and transformer ratio. |
| RREF (Pin 7) | Reference resistor input | Ground-referenced node for RREF (typically 10kΩ); sets feedback gain - internal 1.00V reference enables accurate VOUT programming. |
| TC (Pin 8) | Temperature compensation output | PTAT voltage (3.35mV/°C, 1.00V at 25°C) - used with RTC resistor to compensate output diode forward voltage drift. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates opto-isolator and third transformer winding - reduces BOM cost, improves long-term reliability, and avoids aging-related drift. |
| Boundary + Burst Mode operation | Enables high efficiency across full load range: >85% at full load (boundary mode), >75% at 1% load (low-ripple Burst Mode®). |
| Integrated 150V/2A DMOS switch | Reduces external component count and layout complexity - no external MOSFET driver or high-voltage gate drive needed. |
| Temperature-compensated output | TC pin enables ±0.5% output voltage stability over –40°C to +125°C for 5V outputs using optional RTC resistor. |
| Robust protection suite | Includes output short-circuit protection, internal soft-start (11ms), INTVCC UVLO (2.47V), and overtemperature shutdown. |
Applications
| Industrial PLC Power | Automotive Body Control Module |
|---|---|
Use Scenario: Isolated 5V auxiliary supply for microcontroller, CAN transceiver, and sensor interface in programmable logic controller backplane. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without opto-isolator or third winding. Use Value: Enables compact, maintenance-free 24W housekeeping supply meeting IEC 61000-4 EMC standards with <116µA standby draw. | Use Scenario: 5V isolated rail powering MCU and LIN transceivers in under-dash body control unit exposed to 125°C ambient. IC Role / Device Role / Timing Role: High-temp-rated flyback controller with 150V switch and 150°C junction rating for direct battery connection. Use Value: Eliminates external HV MOSFET and optocoupler, reducing footprint by 35% versus discrete solutions while sustaining operation at 150°C. |
| Medical Patient Monitor Auxiliary | Telecom Remote Radio Unit |
Use Scenario: 3.3V/2A isolated supply for ADC, analog front-end, and isolation barrier in Class II medical equipment. IC Role / Device Role / Timing Role: Boundary-mode flyback controller ensuring <±1% output regulation across line/load/temperature per IEC 60601-1. Use Value: Achieves 5000VRMS isolation compliance with transformer-only design - no opto aging or CMTI degradation over 10-year service life. | Use Scenario: 12V isolated housekeeping supply for FPGAs and clock buffers in outdoor macrocell radio units with –40°C to +85°C operating range. IC Role / Device Role / Timing Role: High-efficiency flyback controller supporting 100VIN surge tolerance and 24W peak power during burst transmission. Use Value: Delivers >88% efficiency at full load with 390µA active-mode IQ - extends backup battery runtime during grid outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8304HS8E#TRPBF | Standard LT8304 variant; 160ns min on-time vs. 950ns for LT8304-1 - less immune to current ringing in high step-up ratios. | Preferred for ≤4:1 transformer turns ratios; unsuitable for 6:1+ configurations requiring extended blanking. | Select LT8304HS8E#TRPBF only if transformer ratio ≤4:1 and VIN ≤60V; otherwise LT8304HS8E-1#TRPBF is required. |
| UCC28740DR | TI PSR controller with 100V/1.5A integrated FET; 100kHz fixed-frequency vs. variable-frequency boundary mode; no TC pin for diode temp compensation. | Targets lower-power (<15W) consumer/industrial supplies; lacks high-temp rating (max 125°C) and 150V switch capability. | Choose UCC28740DR for cost-sensitive <15W designs with <100VIN; avoid for automotive or >20W high-step-up applications. |
Compared with LT8304HS8E#TRPBF, the LT8304HS8E-1#TRPBF offers superior stability in high step-up (≥5:1) topologies due to enhanced current comparator blanking, while UCC28740DR provides lower system cost at the expense of reduced voltage rating, thermal capability, and temperature-compensated regulation.
Availability
LT8304HS8E-1#TRPBF is available at Aetrix Electronics and suitable for industrial PLC power, automotive body control modules, medical patient monitor auxiliary supplies, and telecom remote radio units requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8304HS8E-1#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 family is part of Analog Devices' Power by Linear™ isolated DC/DC controller portfolio, designed specifically for compact, high-reliability opto-free flyback converters in harsh-environment applications including automotive, industrial, and medical systems.
FAQ
What is the maximum recommended transformer turns ratio for LT8304HS8E-1#TRPBF?
The LT8304HS8E-1#TRPBF is specifically optimized for high step-up output applications with transformer turns ratios ≥5:1. For example, a 6:1 ratio is validated in the 4V–80VIN/5VOUT typical application. Using LT8304HS8E-1#TRPBF instead of the standard LT8304 prevents false triggering from primary-side current ringing in these configurations.
Does LT8304HS8E-1#TRPBF require an opto-isolator or third transformer winding?
No, LT8304HS8E-1#TRPBF does not require an opto-isolator or third winding. It regulates the isolated output voltage by sampling the primary-side flyback pulse waveform at the SW pin, enabling true primary-side regulation with minimal external components.
What is the purpose of the TC pin on LT8304HS8E-1#TRPBF?
Pin 8 (TC) on LT8304HS8E-1#TRPBF provides a proportional-to-absolute-temperature (PTAT) voltage (3.35mV/°C, 1.00V at 25°C) used to compensate for the negative temperature coefficient of the output diode's forward voltage. Connecting an RTC resistor between TC and RREF enables ±0.5% output voltage stability over temperature for low-voltage outputs like 3.3V or 5V.
How does LT8304HS8E-1#TRPBF achieve high efficiency at light loads?
LT8304HS8E-1#TRPBF achieves high light-load efficiency through low-ripple Burst Mode® operation: it alternates between active switching cycles and sleep mode (116µA IQ), maintaining regulation while minimizing switching and gate charge losses. The typical 11kHz minimum frequency ensures accurate output sampling without excessive ripple.
What is the significance of the 'H' and '-1' suffixes in LT8304HS8E-1#TRPBF?
The 'H' denotes the high-temperature grade (–40°C to +150°C junction), while '-1' identifies the variant optimized for high step-up output applications with enhanced immunity to primary-side current ringing. Together, LT8304HS8E-1#TRPBF combines extended thermal capability and robust operation in ≥5:1 transformer ratio designs.
LT8304HS8E-1#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-1#TRPBF FAQ
1.How can I place an order for LT8304HS8E-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8304HS8E-1#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-1#TRPBF reliable?
The price and inventory of LT8304HS8E-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8304HS8E-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8304HS8E-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8304HS8E-1#TRPBF?
LT8304HS8E-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8304HS8E-1#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-1#TRPBF?
For technical support, including LT8304HS8E-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8304HS8E-1#TRPBF requirements.
6.How does Aetrix verify that LT8304HS8E-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8304HS8E-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8304HS8E-1#TRPBF?
All LT8304HS8E-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8304HS8E-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT8304HS8E-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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