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Analog Devices Inc. LT8300IS5#TRMPBF
- Part No.:
- LT8300IS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8300IS5#TRMPBF.pdf
- Description:
- IC REG FLYBACK 260MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,254
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Product details
Overview
LT8300IS5#TRMPBF from Analog Devices is a micropower isolated flyback controller IC with integrated 150V/260mA DMOS switch, operating from 6V to 100V input and delivering up to 2W isolated output power. It regulates output voltage via primary-side sampling-eliminating opto-isolators and third windings-and uses a single external resistor (RFB) for VOUT programming. Its boundary mode operation ensures excellent load regulation in telecom, industrial, and automotive auxiliary power supplies.
For engineers reviewing the LT8300IS5#TRMPBF datasheet, LT8300IS5#TRMPBF pinout, LT8300IS5#TRMPBF application, or LT8300IS5#TRMPBF equivalent, key selection criteria include its 150V SW rating, 70µA sleep-mode quiescent current, 5-lead TSOT-23 package, AEC-Q100 qualification, and support for transformer turns ratios up to ~6:1 under 100V input with 150V SW clamp.
Technical Context
The LT8300IS5#TRMPBF implements primary-side sensing using flyback pulse amplitude on the SW pin, enabling accurate output voltage regulation without secondary-side feedback components. Its sample-and-hold error amplifier captures voltage at zero-secondary-current instants, ensuring stable boundary conduction mode (BCM) operation across load range.
It combines three operating modes: BCM at heavy loads (variable frequency, peak-current controlled), discontinuous conduction mode (DCM) with frequency clamping ≤750kHz at medium loads, and low-ripple Burst Mode® at light loads-maintaining 7.5kHz minimum switching frequency and <0.5% full-load minimum load requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide-input industrial and telecom supply rails without external pre-regulation. |
| Integrated Switch | 150V/260mA DMOS - enables direct high-voltage primary-side switching without external MOSFET. |
| Quiescent Current | 70µA in Sleep Mode - minimizes no-load power loss in always-on auxiliary supplies. |
| Output Regulation | VOUT set by single RFB resistor - eliminates opto-isolator, third winding, and compensation network. |
| Switching Frequency | 6–750kHz (clamped) - balances efficiency, EMI, and transformer size across load conditions. |
| Operating Temp Range | –40°C to +125°C junction - qualified for automotive and industrial environments per AEC-Q100. |
| Package | 5-Lead TSOT-23 - compact footprint compatible with automated SMT assembly and space-constrained PCBs. |
Pinout & Package
LT8300IS5#TRMPBF is housed in a 5-lead plastic TSOT-23 package (S5), with exposed pad for thermal performance and JEDEC-standard footprint. Pin 1 is EN/UVLO, Pin 2 is GND, Pin 3 is RFB, Pin 4 is SW (drain of internal DMOS), and Pin 5 is VIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and input undervoltage lockout input | Accurate 1.223V threshold with 2.5µA hysteresis; enables programmable VIN UVLO using resistor divider. |
| GND (Pin 2) | Power and signal reference ground | Must connect directly to local ground plane; serves as return path for internal regulators and feedback circuitry. |
| RFB (Pin 3) | Feedback current input | Accepts 100µA regulation current; sets VOUT via external resistor tied to SW pin and transformer turns ratio. |
| SW (Pin 4) | Drain of internal 150V DMOS switch | Carries primary-side flyback waveform; requires minimized trace area to reduce EMI and voltage spikes. |
| VIN (Pin 5) | Main input supply and reference | Supplies internal circuitry and provides reference for RFB feedback; must be locally bypassed with ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates opto-isolator and third winding - reduces BOM count, cost, and board area while improving long-term reliability. |
| Boundary conduction mode | Zero-current switching at secondary side - delivers tight load regulation without external compensation components. |
| Low-ripple Burst Mode® | Maintains 7.5kHz minimum switching frequency at light load - achieves high efficiency (>75% at 1mA) with minimal output ripple. |
| Internal compensation & soft-start | 2.7ms built-in soft-start timer - prevents inrush current and eases system-level startup sequencing. |
| AEC-Q100 qualification | Rated for automotive applications (Grade I) - supports functional safety requirements in vehicle auxiliary power systems. |
Applications
| Industrial Isolated Auxiliary Power | Automotive Housekeeping Supply |
|---|---|
Use Scenario: Providing isolated 5V/200mA bias for PLC I/O modules operating from 24–48V DC bus. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without secondary feedback. Use Value: Enables compact, reliable auxiliary rail with <0.5% minimum load and 70µA sleep current-reducing standby losses in distributed control systems. |
Use Scenario: Generating isolated 3.3V/150mA for ADAS sensor interface MCU and CAN transceiver in 12V vehicle architecture. IC Role / Device Role / Timing Role: AEC-Q100-qualified flyback controller delivering functional-safety-compliant isolated power. Use Value: Eliminates opto-isolator aging concerns and meets automotive temperature (-40°C to +125°C) and EMC requirements. |
| Telecom 48V-to-5V Isolation | Medical Equipment Isolated Bias |
Use Scenario: Converting -48V telecom supply to isolated 5V for digital logic and monitoring circuits in base station equipment. IC Role / Device Role / Timing Role: High-input-voltage flyback controller supporting wide VIN range and 150V SW rating. Use Value: Withstands 100V transients and delivers 2W output using standard 6:1 transformers-enabling robust field-deployable designs. |
Use Scenario: Delivering isolated 12V/100mA for patient-connected monitoring front-end analog circuitry requiring reinforced isolation. IC Role / Device Role / Timing Role: Primary-side regulated flyback IC meeting 1.5kV isolation and low leakage current specs. Use Value: Achieves <0.5µA typical SW leakage at 100V - critical for low-noise, low-power medical bias rails with stringent safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMS#PBF | Requires external MOSFET; supports up to 100V input but lacks integrated switch; higher component count. | Better suited for >5W outputs or designs requiring custom switch selection and thermal optimization. | Choose LT3748 when higher power or discrete switch control is needed; LT8300IS5#TRMPBF preferred for <2W, ultra-low-component-count solutions. |
| UCC28911DR | TI part with integrated 700V MOSFET; operates up to 85V input; no AEC-Q100 qualification; different RFB scaling. | Targeted at universal AC/DC adapters and offline SMPS-not optimized for 24–100V DC industrial inputs. | Select UCC28911DR only for AC-line-derived supplies; LT8300IS5#TRMPBF remains optimal for high-reliability DC-input isolated bias rails. |
Compared with LT3748EMS#PBF and UCC28911DR, the LT8300IS5#TRMPBF uniquely integrates a 150V/260mA switch in a TSOT-23 package with primary-side regulation, AEC-Q100 qualification, and sub-100µA quiescent current-making it the most compact, lowest-BOM solution for ≤2W isolated DC-DC conversion in harsh environments.
Availability
LT8300IS5#TRMPBF is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply, AEC-Q100 compliance, and long-lifecycle availability.
Supply support for LT8300IS5#TRMPBF 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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial, automotive, and communications markets.
The LT8300 product line delivers micropower isolated flyback controllers optimized for compact, high-reliability auxiliary power in space- and efficiency-constrained systems-designed specifically to replace opto-coupled solutions in DC-input applications.
FAQ
What is the maximum output power achievable with LT8300IS5#TRMPBF?
The LT8300IS5#TRMPBF delivers up to 2W of isolated output power depending on input voltage, transformer turns ratio, and output voltage. At 48V input and 5V output with a 6:1 transformer, typical output is 2.44W at 72V input dropping to 1.87W at 36V input. The 260mA/150V internal switch and boundary mode operation define this practical limit under thermal and voltage stress constraints.
Does LT8300IS5#TRMPBF require an opto-isolator or third winding for regulation?
No. The LT8300IS5#TRMPBF uses primary-side flyback pulse sampling on the SW pin to regulate output voltage-eliminating the need for opto-isolators, third windings, or secondary-side feedback components. This simplifies design, improves reliability, and reduces bill-of-materials cost compared to traditional isolated flyback topologies.
What is the purpose of the RFB pin on LT8300IS5#TRMPBF?
The RFB pin on LT8300IS5#TRMPBF accepts a precise 100µA regulation current that flows through an external resistor to set the output voltage based on transformer turns ratio and diode forward voltage. It replaces conventional feedback networks and enables VOUT programming with a single resistor-no compensation or error amplifier external components required.
How does LT8300IS5#TRMPBF manage light-load efficiency?
The LT8300IS5#TRMPBF employs low-ripple Burst Mode® operation at light loads, maintaining a minimum 7.5kHz switching frequency to ensure accurate output sampling while reducing effective quiescent current to 70µA in sleep mode. This preserves regulation accuracy and minimizes output voltage ripple-unlike conventional burst modes that cause audible noise or large VOUT deviations.
Is LT8300IS5#TRMPBF qualified for automotive applications?
Yes. The LT8300IS5#TRMPBF is AEC-Q100 qualified (Grade I, –40°C to +125°C) and designed for automotive auxiliary and housekeeping power supplies. It supports functional safety requirements and includes features such as accurate EN/UVLO thresholds, internal soft-start, and robust SW pin voltage handling-making it suitable for use in ADAS, infotainment, and body electronics systems.
LT8300IS5#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Flyback
- Output Type:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 260mA
- Frequency - Switching:
- 7.5kHz ~ 750kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT8300IS5#TRMPBF FAQ
1.How can I place an order for LT8300IS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8300IS5#TRMPBF 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 LT8300IS5#TRMPBF reliable?
The price and inventory of LT8300IS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8300IS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8300IS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8300IS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8300IS5#TRMPBF?
LT8300IS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8300IS5#TRMPBF 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 LT8300IS5#TRMPBF?
For technical support, including LT8300IS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8300IS5#TRMPBF requirements.
6.How does Aetrix verify that LT8300IS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8300IS5#TRMPBF 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 LT8300IS5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8300IS5#TRMPBF?
All LT8300IS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8300IS5#TRMPBF, 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 LT8300IS5#TRMPBF part is unused and in its original packaging.
Return procedure for LT8300IS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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