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Analog Devices Inc. LT8300ES5#TRPBF
- Part No.:
- LT8300ES5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8300ES5#TRPBF.pdf
- Description:
- IC REG FLYBACK 260MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,270
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Product details
Overview
LT8300ES5#TRPBF 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 sets VOUT using a single external resistor. Used in automotive auxiliary supplies, telecom housekeeping rails, and industrial isolated bias generation.
For engineers reviewing the LT8300ES5#TRPBF datasheet, LT8300ES5#TRPBF pinout, LT8300ES5#TRPBF application, or LT8300ES5#TRPBF equivalent, key selection criteria include its 70µA sleep-mode quiescent current, boundary/low-ripple burst mode operation, 5-lead TSOT-23 package, and AEC-Q100 qualification for automotive systems requiring functional safety support.
Technical Context
The LT8300ES5#TRPBF implements primary-side regulation by sampling the reflected flyback pulse on the SW pin at zero secondary current-enabling precise output sensing without optocouplers or auxiliary windings. Its boundary conduction mode (BCM) at heavy load ensures excellent line/load regulation and enables compact magnetics.
At light loads, it transitions to low-ripple Burst Mode® with 7.5kHz minimum switching frequency, maintaining high efficiency while limiting output voltage ripple. Internal compensation, soft-start, and accurate EN/UVLO (1.223V threshold with 2.5µA hysteresis current) reduce external component count and simplify design validation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide-input industrial, telecom, and automotive battery-supplied systems. |
| Integrated Switch | 150V/260mA DMOS - eliminates external high-voltage switch; enables self-contained isolated flyback design. |
| Quiescent Current | 70µA in sleep mode - minimizes no-load power loss in always-on auxiliary supplies. |
| Regulation Method | Primary-side flyback pulse sampling - removes need for opto-isolator or third winding, reducing BOM and layout complexity. |
| Output Programming | VOUT set by single RFB resistor - simplifies design and enables flexible output voltage configuration (e.g., 3.3V, 5V, 12V). |
| Switching Modes | Boundary mode (heavy load), discontinuous mode (mid-load), low-ripple Burst Mode® (light load) - balances efficiency, EMI, and regulation across full load range. |
| Package | 5-lead TSOT-23 - ultra-small footprint suitable for space-constrained isolated DC/DC modules. |
Pinout & Package
LT8300ES5#TRPBF is housed in a 5-lead plastic TSOT-23 package (S5), with exposed pad for thermal performance. Pin 1 is EN/UVLO, Pin 2 is GND, Pin 3 is RFB, Pin 4 is SW (drain of internal 150V DMOS switch), and Pin 5 is VIN. The package supports –40°C to +125°C junction temperature operation and is lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and input undervoltage lockout input | Shuts down device below 0.3V; enables VIN UVLO programming via resistor divider with 1.223V threshold and 2.5µA hysteresis current. |
| GND (Pin 2) | Power and signal ground reference | Must connect directly to local ground plane to ensure stable regulation and minimize noise coupling into feedback path. |
| RFB (Pin 3) | External feedback resistor connection | Current-sense node where 100µA flows through external RFB to set output voltage per VOUT = 100µA × RFB / NPS − VF. |
| SW (Pin 4) | Drain of internal 150V/260mA DMOS switch | High dv/dt node; requires minimized trace area and careful layout to suppress EMI and prevent voltage overshoot beyond 150V rating. |
| VIN (Pin 5) | Main input supply and feedback reference | Supplies internal circuitry and serves as reference for RFB-based regulation; must be locally bypassed with ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces bill-of-materials, improves long-term reliability, and eliminates opto aging/nonlinearity issues in isolated power designs. |
| Low-ripple Burst Mode® operation | Maintains <1% output voltage ripple at light loads while achieving >80% efficiency at 1mA output - critical for noise-sensitive analog or sensor circuits. |
| Internal compensation and soft-start | Eliminates external compensation network and prevents inrush current; soft-start timer is fixed at 2.7ms for predictable startup behavior. |
| AEC-Q100 qualified (Grade I) | Validated for automotive applications including body electronics, infotainment, and ADAS auxiliary supplies requiring functional safety support. |
| Minimum load <0.5% of full output | Enables stable regulation down to ~1mA for 5V/300mA design - supports ultra-low-power standby and wake-up circuitry. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Bias Supply |
|---|---|
Use Scenario: Providing isolated 5V/200mA housekeeping power for CAN transceivers and microcontrollers in 12V/24V vehicle electrical systems. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without optocoupler, enabling compact, AEC-Q100-compliant auxiliary rail. Use Value: Eliminates opto aging and third-winding losses, ensuring >15-year reliability in under-hood environments with –40°C to +125°C operation. |
Use Scenario: Generating isolated ±12V bias for op-amps and ADC drivers in programmable logic controllers (PLCs) with 24V DC input. IC Role / Device Role / Timing Role: Micropower flyback controller implementing boundary mode for tight load regulation and low-ripple burst mode for low-noise analog section supply. Use Value: Achieves <10mVpp output ripple at 10mA load and maintains >85% efficiency across 1mA–300mA, reducing thermal stress in sealed enclosures. |
| Telecom Housekeeping Rail | Medical Sensor Isolation |
Use Scenario: Delivering 3.3V/150mA isolated power to Ethernet PHYs and management microcontrollers in 48V PoE-powered switches. IC Role / Device Role / Timing Role: Input-wide (36–72V) flyback controller with primary-side sensing, enabling compact, low-component-count isolated bias for multi-rail systems. Use Value: Supports 6:1 transformer configurations delivering up to 2.44W at 72V input, meeting EN 62368-1 reinforced isolation requirements with 1.5kV-rated magnetics. |
Use Scenario: Powering isolated front-end amplifiers and ADCs in patient-connected diagnostic devices requiring 5kV reinforced isolation and low leakage current. IC Role / Device Role / Timing Role: Isolated flyback controller enabling certified creepage/clearance layouts with no opto-isolator, supporting IEC 60601-1 compliance. Use Value: Enables Class II medical design with <2µA earth leakage, leveraging internal 150V switch and primary-side regulation to eliminate opto-related failure modes. |
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#TRPBF | Requires external high-side MOSFET; no integrated switch; supports up to 100V input but lacks low-ripple burst mode. | Better suited for higher-power (>5W) isolated supplies where discrete switch optimization is needed. | Select LT3748EMS#TRPBF when output power exceeds 2W or when custom switch SOA tailoring is required. |
| UCC28740DR | TI part with integrated 700V MOSFET; uses different primary-sensing architecture; higher quiescent current (120µA active mode). | Targeted at universal AC-input offline flyback; not rated for AEC-Q100 or automotive temperature range. | Choose UCC28740DR only for AC/DC adapter applications; avoid for automotive or 100V-input DC/DC due to missing qualification and higher IQ. |
Compared with LT3748EMS#TRPBF and UCC28740DR, the LT8300ES5#TRPBF uniquely combines integrated 150V/260mA switching, AEC-Q100 qualification, 70µA sleep IQ, and low-ripple burst mode - making it optimal for space- and efficiency-constrained automotive and industrial isolated DC/DC designs under 2W.
Availability
LT8300ES5#TRPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial PLC bias supplies, telecom housekeeping rails, and medical sensor isolation requiring stable component supply and long-lifecycle support.
Supply support for LT8300ES5#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets with precision, reliability, and innovation.
The LT8300 product line delivers micropower isolated flyback controllers optimized for compact, low-BOM-count, high-reliability DC/DC conversion in automotive, industrial, and medical applications demanding functional safety and wide input voltage operation.
FAQ
What is the maximum output power achievable with LT8300ES5#TRPBF?
The LT8300ES5#TRPBF delivers up to 2W of isolated output power, depending on input voltage, transformer turns ratio, and output voltage. For example, with a 6:1 transformer and 36–72V input, it achieves 1.87W at 36V and 2.44W at 72V for a 5V output. The internal 260mA/150V switch and boundary mode operation define this practical limit.
Does LT8300ES5#TRPBF require an opto-isolator or third winding for regulation?
No. The LT8300ES5#TRPBF uses primary-side flyback pulse sampling to regulate the isolated output voltage, eliminating the need for an opto-isolator or third winding. This reduces component count, improves long-term reliability, and avoids opto aging and nonlinearity issues inherent in traditional isolated flyback designs.
What is the purpose of the RFB pin on LT8300ES5#TRPBF?
The RFB pin on LT8300ES5#TRPBF is the feedback current-sense node where a single external resistor connects to set the output voltage. A precise 100µA current flows through this resistor, and VOUT is calculated as VOUT = (100µA × RFB / NPS) − VF. This enables simple, accurate output programming without secondary-side components.
How does LT8300ES5#TRPBF manage light-load efficiency?
The LT8300ES5#TRPBF employs low-ripple Burst Mode® operation at light loads, cycling between active and sleep modes to reduce effective quiescent current to 70µA. It maintains a minimum 7.5kHz switching frequency to ensure accurate output sampling and limits output voltage ripple to <1%, preserving signal integrity in sensitive analog circuits.
Is LT8300ES5#TRPBF qualified for automotive applications?
Yes. The LT8300ES5#TRPBF is AEC-Q100 qualified (Grade I, –40°C to +125°C) and designed to support functional safety at the system level. It is widely used in automotive auxiliary power supplies for infotainment, ADAS sensors, and body control modules where reliability and temperature robustness are critical.
LT8300ES5#TRPBF 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
LT8300ES5#TRPBF FAQ
1.How can I place an order for LT8300ES5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8300ES5#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 LT8300ES5#TRPBF reliable?
The price and inventory of LT8300ES5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8300ES5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8300ES5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8300ES5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8300ES5#TRPBF?
LT8300ES5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8300ES5#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 LT8300ES5#TRPBF?
For technical support, including LT8300ES5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8300ES5#TRPBF requirements.
6.How does Aetrix verify that LT8300ES5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8300ES5#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 LT8300ES5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8300ES5#TRPBF?
All LT8300ES5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8300ES5#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 LT8300ES5#TRPBF part is unused and in its original packaging.
Return procedure for LT8300ES5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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