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Analog Devices Inc. LT8300IS5#TRPBF
- Part No.:
- LT8300IS5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8300IS5#TRPBF.pdf
- Description:
- IC REG FLYBACK 260MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,594
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Product details
Overview
LT8300IS5#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 in boundary or low-ripple Burst Mode. It regulates output voltage via primary-side sampling-eliminating opto-isolators and third windings-and uses a single external resistor (RFB) for VOUT programming. Designed for automotive-grade auxiliary power supplies requiring high-voltage isolation and ultra-low quiescent current.
For engineers reviewing the LT8300IS5#TRPBF datasheet, LT8300IS5#TRPBF pinout, LT8300IS5#TRPBF application, or LT8300IS5#TRPBF equivalent, key selection considerations include its 70µA sleep-mode IQ, 150V SW pin rating, 5-lead TSOT-23 package, AEC-Q100 qualification, and boundary-mode operation enabling compact transformer design without secondary feedback components.
Technical Context
The LT8300IS5#TRPBF implements primary-side regulation using flyback pulse sensing: it samples the reflected output voltage on the SW pin when secondary current reaches zero, enabling precise regulation without opto-isolators or auxiliary windings. Its internal sample-and-hold error amplifier compares this sampled voltage against a 1.223V bandgap reference, with RFB current trimmed to 100µA ±2% across temperature.
It operates in three distinct modes: boundary conduction mode at heavy load (variable frequency, zero-current switching), discontinuous conduction mode at medium load (frequency clamped ≤750kHz), and low-ripple Burst Mode® at light load (7.5kHz min frequency, 70µA IQ). Internal soft-start (2.7ms), compensation, and EN/UVLO with 1.223V threshold and 2.5µA hysteresis simplify system integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide-range industrial, telecom, and automotive battery inputs including 24V, 36V, 48V, and 72V systems. |
| Integrated Switch | 150V/260mA DMOS - eliminates external high-voltage switch; enables compact isolated flyback designs up to 2W output. |
| Quiescent Current | 70µA in Sleep Mode - minimizes standby power loss in always-on auxiliary supplies. |
| Regulation Method | Primary-side sampling via SW pin - removes need for opto-isolator or third winding, reducing BOM count and cost. |
| Output Programming | Single RFB resistor - sets VOUT per VOUT = (100µA × RFB)/NPS − VF; enables rapid configuration for 3.3V, 5V, 12V, or 24V outputs. |
| Switching Frequency | 6kHz to 750kHz - adaptive boundary/discontinuous/Burst Mode operation optimizes efficiency across 0.5%–100% load range. |
| Package | 5-Lead TSOT-23 - surface-mount, thermally enhanced plastic package with θJA = 150°C/W; footprint compatible with standard SOT-23 pick-and-place. |
| Temperature Grade | –40°C to +125°C junction - qualified per AEC-Q100 Grade I, suitable for under-hood and industrial control environments. |
Pinout & Package
LT8300IS5#TRPBF is housed in a 5-lead plastic TSOT-23 package (S5), with exposed pad for thermal enhancement. 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 measures 2.9mm × 1.6mm × 0.85mm and is lead-free, 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 at 1.223V with 2.5µA hysteresis - allows precise, programmable VIN UVLO using resistor divider. |
| GND (Pin 2) | Power and signal ground reference | Must connect directly to local ground plane; serves as return path for internal regulators and feedback circuitry. |
| RFB (Pin 3) | Feedback current input for output voltage setting | Accepts 100µA regulation current; RFB value determines VOUT per VOUT = (100µA × RFB)/NPS − VF - no secondary-side components required. |
| SW (Pin 4) | Drain of internal 150V/260mA DMOS switch | Connects to transformer primary; must minimize trace area to reduce EMI and leakage-induced voltage spikes - absolute max 150V transient rating. |
| VIN (Pin 5) | Main input supply and reference node | Supplies internal circuitry and serves as reference for RFB feedback; requires local 1µF ceramic bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates opto-isolator and third winding - reduces component count, cost, and layout complexity while improving long-term reliability. |
| Low-ripple Burst Mode® | Maintains <15mVpp output ripple at light load while achieving >80% efficiency at 1mA - critical for noise-sensitive analog and sensor circuits. |
| Boundary conduction mode | Enables zero-current switching and excellent load regulation (<±3%) without external compensation - supports smaller, lower-cost transformers. |
| Internal soft-start and compensation | 2.7ms soft-start prevents inrush current; fully integrated loop compensation removes need for external RC networks. |
| AEC-Q100 Grade I qualification | Validated for automotive auxiliary power applications including infotainment, ADAS sensors, and body control modules. |
| Minimum load requirement | <0.5% of full output - enables stable regulation even during deep sleep states in IoT and battery-powered systems. |
Applications
| Industrial Auxiliary Power | Automotive Housekeeping Supply |
|---|---|
Use Scenario: Isolated 5V/200mA auxiliary rail powering PLC I/O modules, fieldbus transceivers, and isolated ADCs in 24V–72V factory automation systems. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without secondary feedback components. Use Value: Reduces bill-of-materials by eliminating opto-isolator and third winding; maintains ±3% output regulation across –40°C to +85°C ambient. |
Use Scenario: 3.3V/150mA isolated supply for automotive camera ECU, radar sensor interface, or gateway microcontroller in 12V/24V battery systems. IC Role / Device Role / Timing Role: AEC-Q100 qualified flyback controller providing functional safety–capable auxiliary power with 70µA sleep IQ. Use Value: Enables always-on vision systems with <100µA total standby current; withstands cold-crank (4.5V) and load-dump (120V) transients via 100V VIN rating. |
| Medical Isolated Monitoring | Telecom DC-DC Isolation |
Use Scenario: 5V isolated bias for patient-connected ECG front-end amplifiers and isolated SPI interfaces in Class II medical devices. IC Role / Device Role / Timing Role: Safety-isolated flyback controller meeting 1.5kV reinforced insulation requirements with no secondary-side components. Use Value: Achieves creepage/clearance compliance with single-layer PCB layout; eliminates opto aging drift affecting long-term calibration stability. |
Use Scenario: 12V/100mA isolated housekeeping supply for PoE PD controllers, base station FPGAs, and remote radio units powered from 36V–57V telecom rectifiers. IC Role / Device Role / Timing Role: High-input-voltage flyback controller supporting wide-line telecom inputs with minimal external parts. Use Value: Delivers >85% peak efficiency across 10mA–300mA load; operates reliably at 70°C ambient with 150°C junction limit and thermal shutdown protection. |
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 400V input; uses opto-coupled feedback or primary-side sensing with different RFB equation. | Used where higher input voltage (>100V) or higher output power (>3W) is needed; lacks integrated 150V switch and AEC-Q100 qualification. | Select LT3748 when designing >100V input or >2W isolated supplies; LT8300IS5#TRPBF preferred for compact, integrated, automotive-qualified 2W solutions. |
| UCC28740DR | TI part with integrated 700V MOSFET; uses different primary-sensing architecture; 100µA typical IQ but not AEC-Q100 qualified; 6-pin SOIC package. | Targeted at universal AC-DC adapters (85–265VAC); not rated for 100V DC input or automotive temperature range. | Choose UCC28740 for AC-input offline converters; LT8300IS5#TRPBF is optimal for high-reliability DC-input isolated supplies in harsh environments. |
Compared with LT3748EMS#TRPBF and UCC28740DR, the LT8300IS5#TRPBF offers the only combination of integrated 150V/260mA switch, AEC-Q100 qualification, 5-lead TSOT-23 footprint, and true opto-free primary-side regulation - making it uniquely suited for space-constrained, automotive-grade DC-DC isolation.
Availability
LT8300IS5#TRPBF is available at Aetrix Electronics and suitable for industrial auxiliary power, automotive housekeeping supplies, and medical isolated monitoring requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT8300IS5#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LT8300 product line delivers micropower isolated flyback controllers optimized for compact, reliable, and cost-effective DC-DC isolation in automotive, industrial, and medical systems - emphasizing primary-side regulation, ultra-low IQ, and AEC-Q100 qualification.
FAQ
What is the maximum output power achievable with LT8300IS5#TRPBF?
The LT8300IS5#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 36V–72V input, it achieves 1.87W at 36V and 2.44W at 72V for a 5V output. Maximum power is constrained by the 150V SW pin rating and 260mA switch current limit - exceeding either risks device failure.
Does LT8300IS5#TRPBF require an opto-isolator or third winding for regulation?
No, the LT8300IS5#TRPBF does not require an opto-isolator or third winding. It regulates output voltage by sampling the reflected flyback pulse directly on the SW pin during zero-secondary-current intervals. This primary-side sensing method eliminates isolation components while maintaining ±3% output accuracy across line, load, and temperature.
How is the output voltage set on LT8300IS5#TRPBF?
The output voltage of LT8300IS5#TRPBF is set using a single external resistor (RFB) connected between the RFB pin and the SW node. With a nominal RFB regulation current of 100µA and internal 12.23kΩ reference, VOUT ≈ (100µA × RFB)/NPS − VF. For a 5V output and 4:1 transformer, RFB ≈ 200kΩ yields nominal regulation before fine-tuning.
What are the key differences between LT8300IS5#TRPBF and LT8300ES5#TRPBF?
The LT8300IS5#TRPBF is specified for –40°C to +125°C junction temperature and qualified per AEC-Q100 Grade I, making it suitable for automotive and extended-temperature industrial use. The LT8300ES5#TRPBF is rated for 0°C to +125°C and not AEC-Q100 qualified - both share identical electrical specs, pinout, and package, but differ in temperature validation and reliability testing scope.
Can LT8300IS5#TRPBF operate with a 12V input?
Yes, LT8300IS5#TRPBF operates from 6V to 100V input, so 12V is well within specification. At low input voltages, output power is reduced due to duty-cycle limitations and switch current headroom - e.g., a 12V input with 5V/300mA output requires careful transformer selection (e.g., 1:1 or 2:1 ratio) to avoid exceeding the 150V SW pin stress limit.
LT8300IS5#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
LT8300IS5#TRPBF FAQ
1.How can I place an order for LT8300IS5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8300IS5#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 LT8300IS5#TRPBF reliable?
The price and inventory of LT8300IS5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8300IS5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8300IS5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8300IS5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8300IS5#TRPBF?
LT8300IS5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8300IS5#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 LT8300IS5#TRPBF?
For technical support, including LT8300IS5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8300IS5#TRPBF requirements.
6.How does Aetrix verify that LT8300IS5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8300IS5#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 LT8300IS5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8300IS5#TRPBF?
All LT8300IS5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8300IS5#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 LT8300IS5#TRPBF part is unused and in its original packaging.
Return procedure for LT8300IS5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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