My Inquiry
My Account
Analog Devices Inc. LT8304IS8E-1#TRPBF
- Part No.:
- LT8304IS8E-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8304IS8E-1#TRPBF.pdf
- Description:
- IC REG FLYBACK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,730
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8304IS8E-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 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-1#TRPBF datasheet, LT8304IS8E-1#TRPBF pinout, LT8304IS8E-1#TRPBF application, or LT8304IS8E-1#TRPBF equivalent, this device offers confirmed 116µA sleep-mode quiescent current, 390µA active-mode IQ, quasi-resonant boundary mode operation, low-ripple Burst Mode® at light load, and temperature-compensated output regulation for 3.3V–24V isolated outputs.
Technical Context
The LT8304IS8E-1#TRPBF implements primary-side sensing via RFB pin sampling of the flyback pulse amplitude during zero-secondary-current intervals, eliminating need for optocouplers or auxiliary windings. Its sample-and-hold error amplifier compares RFB-derived voltage against 1.00V internal reference, while boundary mode detector ensures valley-switching for high efficiency and tight load regulation.
This variant (LT8304-1) features extended minimum switch-on time (950ns vs. 160ns for LT8304) and enhanced immunity to SW-node current ringing in high step-up (≥5:1 turns ratio) applications-critical for stable 5V@72VIN or 12V@100VIN designs where reflected capacitance causes false current comparator triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 100V - supports wide-input industrial and telecom rails including 24V, 48V, and 72V systems without external pre-regulation. |
| Integrated Switch | 150V/2A DMOS - enables single-chip isolated flyback with no external high-voltage MOSFET; RDS(ON) = 0.5Ω reduces conduction loss. |
| Quiescent Current | 116µA (sleep), 390µA (active) - extends battery life in always-on auxiliary supplies and enables <0.5% minimum load operation. |
| Switching Modes | Quasi-resonant boundary mode (heavy load), discontinuous mode (mid-load), low-ripple Burst Mode® (light load) - maintains >85% efficiency across 0.5mA–4.2A output range. |
| Output Regulation | Programmed via RFB/RREF resistors; optional TC pin compensation - achieves ±5% total output accuracy over temperature with diode tempco correction. |
| Max Output Power | 24W - verified at 72VIN/5VOUT with 6:1 transformer; limited by 110V switch stress margin (150V rating − 40V leakage spike allowance). |
| Operating Temp | –40°C to +125°C junction - qualified for industrial and automotive under-hood auxiliary supply use with thermal shutdown protection. |
Pinout & Package
LT8304IS8E-1#TRPBF is housed in an 8-lead plastic SO package (S8E) with exposed thermal pad (Pin 9, GND), requiring soldering to PCB ground plane for thermal and electrical integrity. Package dimensions: 4.9mm × 6.0mm × 1.75mm, θJA = 33°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input Undervoltage Lockout | Shuts down IC below 0.2V; 1.214V enable threshold with 14mV hysteresis enables precise VIN UVLO programming using resistor divider. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal logic and gate driver; requires ≥1µF ceramic bypass to GND; must not be externally driven. |
| VIN (Pin 3) | Main Input Supply | Supplies control circuitry and serves as reference for RFB feedback network; local bulk capacitor required. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power & Signal Ground | Common return for all circuits; exposed pad must be soldered to PCB ground plane for thermal dissipation and EMI reduction. |
| SW (Pin 5) | Drain of Internal 150V/2A Switch | Connects to transformer primary; trace area must be minimized to suppress EMI and voltage spikes from leakage inductance. |
| RFB (Pin 6) | Feedback Sense Input | Receives current from RFB resistor tied to SW node; samples flyback pulse amplitude to derive isolated output voltage. |
| RREF (Pin 7) | Reference Resistor Terminal | Ground-referred node for RREF resistor (typically 10kΩ); sets gain for VOUT = 1.00V × (RFB/RREF) × (1/NPS) – VF. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1.00V @ 25°C, +3.35mV/°C) used with RTC resistor to cancel output diode forward-voltage tempco. |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces BOM count by 3–5 components and eliminates opto aging/nonlinearity, enabling <1% load regulation without secondary-side feedback. |
| Low-ripple Burst Mode® operation | Maintains <30mVPP output ripple at 10mA load while achieving >75% efficiency-critical for noise-sensitive analog/medical subsystems. |
| Boundary mode with valley switching | Enables zero-current turn-on, minimizing switching loss and EMI; allows smaller magnetics than CCM flyback while avoiding subharmonic oscillation. |
| Integrated soft-start and compensation | 11ms internal soft-start prevents inrush current; internal loop compensation eliminates external Type II/III networks-reducing design iteration time. |
| Output short-circuit protection | Auto-recovery hiccup mode limits average power during fault, protecting transformer, diode, and IC without external current-sense resistor. |
Applications
| Industrial PLC Auxiliary Power | Medical Isolation Barrier Supply |
|---|---|
Use Scenario: Providing isolated 5V/2A housekeeping power to microcontrollers and ADCs in programmable logic controllers with 24V–72V DC input rails. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output via RFB sampling; operates in boundary mode at full load and Burst Mode® at standby. Use Value: Eliminates optocoupler and third winding, reducing transformer size by 30% and improving long-term stability over 10-year field life. |
Use Scenario: Generating 3.3V/500mA isolated bias for patient-connected ECG front-end amplifiers requiring 4kV reinforced isolation per IEC 60601-1. IC Role / Device Role / Timing Role: Isolated flyback controller with TC-pin temperature compensation ensuring <±2% output accuracy from –20°C to +50°C ambient. Use Value: Meets creepage/clearance requirements with single transformer; avoids opto drift that could compromise safety-critical voltage references. |
| Telecom Remote Radio Unit (RRU) | Automotive ADAS Domain Controller |
Use Scenario: Delivering 12V/2A isolated power to remote radio head FPGAs and DACs in 48V-powered base stations with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency flyback controller operating in discontinuous mode at mid-load and Burst Mode® at sleep; SW pin rated to 150V handles 48VIN transients. Use Value: Achieves >90% peak efficiency at 1.5A load while meeting EN55022 Class B conducted emissions without shielding. |
Use Scenario: Supplying isolated 5V/1A power to camera sensor interfaces and CAN transceivers in autonomous driving domain controllers with 12V vehicle battery input. IC Role / Device Role / Timing Role: LT8304IS8E-1#TRPBF variant selected for high step-up ratio (≥6:1) to support 5V output from 12VIN with minimal SW-node ringing. Use Value: Extended 950ns minimum on-time prevents false triggering during cold-crank (6.5V) and load-dump (36V) events, ensuring uninterrupted camera power. |
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#TRPBF | Standard variant with 160ns min on-time; less immune to SW ringing in high step-up ratios. | Suitable for ≤4:1 turns ratio or lower VIN (<48V) applications where ringing is negligible. | Select when cost sensitivity outweighs need for high-ratio robustness; verify SW waveform stability with oscilloscope at light load. |
| UCC28740DR | Texas Instruments PSR controller with 700V integrated FET; higher voltage rating but 1.5mA typical IQ (vs. 390µA). | Better suited for universal AC input (85–265VAC) offline adapters; not optimized for ultra-low-IQ DC-DC flyback. | Choose for AC/DC applications requiring higher input voltage range; avoid for battery-backed or low-power auxiliary supplies. |
Compared with LT8304IS8E#TRPBF, the LT8304IS8E-1#TRPBF provides superior stability in high step-up designs due to its 950ns minimum on-time and enhanced current comparator blanking, while UCC28740DR trades ultra-low quiescent current for higher integration voltage capability-making it unsuitable for 3–100V DC input micropower isolation.
Availability
LT8304IS8E-1#TRPBF is available at Aetrix Electronics and suitable for industrial PLC auxiliary power, medical isolation barrier supplies, telecom RRU bias, and automotive ADAS domain controller applications requiring stable component supply, long lifecycle support, and guaranteed parametric performance over temperature.
Supply support for LT8304IS8E-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, serving precision instrumentation, industrial automation, and medical markets.
The LT8304 family was designed specifically for micropower isolated flyback conversion in space-constrained, thermally demanding environments-enabling compact, opto-free auxiliary supplies for safety-critical and long-lifecycle systems.
FAQ
What is the key functional difference between LT8304IS8E-1#TRPBF and LT8304IS8E#TRPBF?
The LT8304IS8E-1#TRPBF features a 950ns minimum switch-on time versus 160ns for the standard LT8304IS8E#TRPBF, making it specifically optimized for high step-up output applications (≥5:1 transformer turns ratio). This extended on-time improves immunity to SW-node current ringing during light-load operation at high input voltages, preventing false triggering of the current comparator and ensuring stable regulation in 5V@72VIN or 12V@100VIN designs.
Can LT8304IS8E-1#TRPBF regulate output voltage without an optocoupler or third transformer winding?
Yes, the LT8304IS8E-1#TRPBF regulates output voltage exclusively through primary-side sensing: it samples the amplitude of the flyback pulse at the SW pin during zero-secondary-current intervals using the RFB resistor, then compares the derived voltage against its internal 1.00V reference. This eliminates need for optocouplers, third windings, or secondary-side feedback components-reducing BOM count, cost, and long-term drift risks.
What is the purpose of the TC pin on LT8304IS8E-1#TRPBF, and how is it used?
Pin 8 (TC) on the LT8304IS8E-1#TRPBF outputs 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 corrects VOUT drift-enabling ±2% regulation over –40°C to +125°C for low-voltage outputs like 3.3V or 5V.
What is the maximum isolated output power achievable with LT8304IS8E-1#TRPBF?
The LT8304IS8E-1#TRPBF delivers up to 24W of isolated output power, verified at 72VIN/5VOUT with a 6:1 transformer. This limit is set by the 150V switch rating minus a 40V margin for leakage inductance spikes (110V max switch stress), combined with the 2A minimum current limit and boundary-mode efficiency. Output power scales with input voltage, transformer turns ratio, and efficiency-e.g., 19W at 75VIN, 14.4W at 36VIN.
Does LT8304IS8E-1#TRPBF include built-in protection features?
Yes, the LT8304IS8E-1#TRPBF integrates output short-circuit protection with auto-recovery hiccup mode, overtemperature shutdown (activating above 150°C junction), INTVCC undervoltage lockout (2.47V falling threshold), and accurate EN/UVLO with 14mV hysteresis. These protections operate without external components, safeguarding the IC, transformer, and output diode during fault conditions while maintaining compliance with industrial safety standards.
LT8304IS8E-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8304IS8E-1#TRPBF FAQ
1.How can I place an order for LT8304IS8E-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8304IS8E-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 LT8304IS8E-1#TRPBF reliable?
The price and inventory of LT8304IS8E-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 LT8304IS8E-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8304IS8E-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8304IS8E-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8304IS8E-1#TRPBF?
LT8304IS8E-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8304IS8E-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 LT8304IS8E-1#TRPBF?
For technical support, including LT8304IS8E-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8304IS8E-1#TRPBF requirements.
6.How does Aetrix verify that LT8304IS8E-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8304IS8E-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 LT8304IS8E-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8304IS8E-1#TRPBF?
All LT8304IS8E-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8304IS8E-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 LT8304IS8E-1#TRPBF part is unused and in its original packaging.
Return procedure for LT8304IS8E-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8304IS8E-1#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
