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Analog Devices Inc. LT8306RS6#TRPBF
- Part No.:
- LT8306RS6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT8306RS6#TRPBF.pdf
- Description:
- 60V LOW-IQ NO-OPTO ISO. FLYBACK
- Quantity:
- Payment:
- Shipping:
Inventory:4,430
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Product details
Overview
LT8306RS6#TRPBF from Analog Devices is a 60V input, low-quiescent-current no-opto isolated flyback controller in a 6-lead TSOT-23 package. It regulates isolated outputs without optocouplers or third-winding sensing, uses a single external resistor (RFB) to set VOUT, delivers 8V gate drive to an external N-channel MOSFET, and operates in quasi-resonant boundary mode at heavy load and low-ripple burst mode at light load - enabling compact, high-efficiency auxiliary power supplies for automotive ECUs.
For engineers reviewing the LT8306RS6#TRPBF datasheet, LT8306RS6#TRPBF pinout, LT8306RS6#TRPBF application, or LT8306RS6#TRPBF equivalent, key selection criteria include its 4.5V–60V input range, 120μA sleep-mode IQ, 390μA active-mode IQ, 8V gate driver capability, and AEC-Q100 qualification for automotive-grade reliability in space-constrained isolated DC/DC designs.
Technical Context
The LT8306RS6#TRPBF implements primary-side regulation by sampling the reflected flyback pulse on the RFB pin during zero-secondary-current intervals, eliminating optocouplers and third windings. Its internal sample-and-hold error amplifier, boundary mode detector, and integrated soft-start enable stable regulation with minimal external components.
It supports three operating modes: quasi-resonant boundary conduction mode (up to 440kHz) for high efficiency at medium-to-heavy loads, discontinuous conduction mode (frequency-clamped ≤400kHz) to limit switching losses at light loads, and low-ripple burst mode (≥10kHz min frequency) with 120μA sleep current to maintain tight output regulation while minimizing light-load ripple and quiescent power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V - supports wide automotive battery transients (cold crank to load dump) without external pre-regulation. |
| IQ (Sleep) | 120μA - enables <0.5% minimum load operation and ultra-low standby power in always-on vehicle modules. |
| IQ (Active) | 390μA - ensures high conversion efficiency across full load range while minimizing self-heating in thermally constrained layouts. |
| GATE Drive | 8V (7.5–8.5V) - directly drives standard logic-level N-channel MOSFETs without level-shifting or external drivers. |
| fSW Range | 7.5kHz–440kHz - dynamically adjusts frequency per load to optimize core loss, copper loss, and EMI profile. |
| RFB Regulation | 100μA ±2.5% - sets output voltage via single resistor (VOUT ≈ 100μA × RFB / NPS − VF), enabling precise, layout-insensitive programming. |
| SENSE Threshold | 17mV (min), 95mV (typ), 160mV (overcurrent) - provides accurate current limiting with minimal sense resistor power loss (e.g., 5mΩ yields 3.4A peak). |
| EN/UVLO | 1.228V enable threshold with 18mV hysteresis - allows programmable undervoltage lockout using simple resistor divider from VIN. |
Pinout & Package
LT8306RS6#TRPBF is housed in a 6-lead TSOT-23 package (θJA = 192°C/W), optimized for high-density PCB layouts and automotive thermal environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SENSE | Current-sense comparator input | Kelvin-connected to source of external MOSFET's sense resistor; triggers overcurrent shutdown at 160mV and regulates peak current at 17–95mV. |
| 2 - GND | Power and signal ground reference | Must be tied directly to low-impedance ground plane; serves as return path for gate drive, feedback, and internal regulators. |
| 3 - GATE | N-channel MOSFET gate driver output | Supplies 8V swing (0V to 8V) with 60ns rise/30ns fall time into 3.3nF load; drives logic-level FETs without external buffers. |
| 4 - RFB | Primary-side feedback input | Connects to transformer primary switch node; samples flyback pulse to regulate isolated output voltage without optocoupler or third winding. |
| 5 - VIN | Main input supply and reference | Accepts 4.5V–60V; powers internal circuitry and serves as reference for RFB feedback loop; requires local 1μF ceramic bypass. |
| 6 - EN/UVLO | Enable and undervoltage lockout input | Shuts down device below 0.2V; enables at 1.228V with 18mV hysteresis; supports programmable UVLO using resistor divider from VIN. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolation | Eliminates optocoupler and third-winding requirements - reduces BOM count, cost, and board area while improving long-term reliability and temperature stability. |
| Boundary + burst mode | Combines quasi-resonant boundary conduction (high efficiency, low EMI) with low-ripple burst mode (120μA IQ, <10mVpp ripple) - maintains regulation across 0.5%–100% load range. |
| Single-resistor VOUT setting | Output voltage programmed via one external RFB resistor - simplifies design, eliminates trimming, and enables rapid reconfiguration for multiple output voltages. |
| AEC-Q100 qualified | Rated for automotive junction temperatures (−40°C to +150°C) with built-in overtemperature protection - suitable for under-hood and ADAS power supply applications. |
| Internal compensation | Integrated loop compensation eliminates external capacitor and resistor - reduces component count, layout sensitivity, and startup settling time. |
| 8V gate drive | Directly drives standard logic-level N-channel MOSFETs - avoids gate driver ICs or discrete level-shifters, lowering system complexity and propagation delay. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Isolation |
|---|---|
Use Scenario: Powering isolated CAN transceiver and microcontroller peripherals from 12V battery rail in harsh automotive environments. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating 3.3V/5V isolated auxiliary rails without optocoupler or third winding. Use Value: Enables AEC-Q100-compliant, compact 6mm² solution with <0.5% minimum load and 120μA sleep current - critical for always-on BCM wake-up functionality. | Use Scenario: Generating isolated 24V/5V rails for analog sensor inputs and digital I/O in factory automation controllers. IC Role / Device Role / Timing Role: No-opto flyback controller delivering stable, low-noise isolated power across wide industrial input (18–36V DC) with minimal external parts. Use Value: Achieves >85% efficiency at full load and <10mVpp output ripple in burst mode - ensuring clean power for precision ADCs and noise-sensitive logic. |
| Medical Patient Monitoring Auxiliary Supply | Telecom Remote PHY Power |
Use Scenario: Providing reinforced-isolation 5V/3.3V rails for patient-connected front-end circuits in portable ECG/SpO₂ devices. IC Role / Device Role / Timing Role: Isolated flyback controller meeting IEC 60601 creepage/clearance requirements via transformer-only isolation - no optocoupler needed. Use Value: Reduces risk of optocoupler aging-induced drift and supports 150°C junction rating - essential for long-life, safety-critical medical power stages. | Use Scenario: Powering remote PHY chips in fiber-to-the-home (FTTH) ONT units where space and thermal headroom are limited. IC Role / Device Role / Timing Role: Compact flyback controller generating 12V/1.8V isolated outputs from 48V PoE-derived input. Use Value: Delivers 4A output with 6-lead TSOT-23 footprint and 400kHz max fSW - enabling small heatsink-free design compliant with Telcordia GR-1089 EMI limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28911DR | Lower VIN max (75V vs. 60V), higher IQ (250μA sleep), no AEC-Q100 rating, 8-pin SOIC package | Targeted at general-purpose AC/DC adapters; lacks automotive qualification and TSOT-23 footprint | Choose UCC28911DR only if higher input voltage margin is required and automotive qualification is not needed. |
| MAX17690ATP+T | Wider VIN (4.5V–60V), 100μA sleep IQ, but requires optocoupler feedback and has larger 10-pin TDFN package | Designed for high-accuracy isolated supplies where optocoupler-based regulation is acceptable | Choose MAX17690ATP+T when tighter initial output accuracy (<±1%) is required and board space permits larger package. |
Compared with UCC28911DR and MAX17690ATP+T, the LT8306RS6#TRPBF uniquely combines AEC-Q100 qualification, no-opto operation, 6-lead TSOT-23 size, and 120μA sleep current - making it the only option for space-constrained, automotive-grade isolated auxiliary supplies requiring zero optocoupler dependency.
Availability
LT8306RS6#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O isolation, medical patient monitoring auxiliary supplies, and telecom remote PHY power requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LT8306RS6#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, headquartered in Wilmington, MA, serving automotive, industrial, communications, and healthcare markets.
The LT8306RS6#TRPBF belongs to Analog Devices' Power by Linear™ isolated controller product line, engineered specifically for compact, high-reliability no-opto flyback power supplies in automotive and industrial systems where space, efficiency, and qualification are critical.
FAQ
What is the minimum load requirement for stable regulation with the LT8306RS6#TRPBF?
The LT8306RS6#TRPBF maintains stable regulation down to less than 0.5% of full output load due to its low-ripple burst mode operation and 120μA sleep-mode quiescent current. This enables reliable operation in always-on automotive modules such as door modules or sensor nodes where standby current must remain ultra-low without sacrificing output accuracy. The LT8306RS6#TRPBF achieves this by dynamically switching between active and sleep modes while preserving sampling integrity via its minimum 10kHz switching frequency.
Does the LT8306RS6#TRPBF require an optocoupler or third-winding feedback?
No, the LT8306RS6#TRPBF does not require an optocoupler or third-winding feedback. It regulates the isolated output voltage by sampling the reflected flyback pulse directly on the RFB pin during zero-secondary-current intervals - a proprietary primary-side sensing technique that eliminates optocouplers, third windings, and associated aging, nonlinearity, and layout sensitivity issues. This architecture is confirmed in the LT8306 datasheet Rev A, Figure 22 block diagram and Theory of Operation section.
What is the maximum output power achievable with the LT8306RS6#TRPBF?
The LT8306RS6#TRPBF itself does not define maximum output power - it is determined by external components: the MOSFET's VDS rating and RDS(on), transformer saturation current and leakage inductance, and output diode rating. For example, with an 80V-rated MOSFET, 2:1 turns ratio, and 10A peak primary current, up to ~40W can be achieved at 12V output (per Figure 24). The LT8306RS6#TRPBF supports this by providing precise 17–95mV SENSE threshold control and 8V gate drive to ensure robust external switch operation.
How is the output voltage set on the LT8306RS6#TRPBF?
The output voltage of the LT8306RS6#TRPBF is set using a single external resistor (RFB) connected between the RFB pin and the transformer primary switch node. The relationship is VOUT ≈ (100μA × RFB / NPS) − VF, where NPS is the primary-to-secondary turns ratio and VF is the output diode forward voltage (~0.3V). The LT8306RS6#TRPBF's internal 100μA RFB regulation current and sample-and-hold error amplifier enable accurate, layout-tolerant programming without trimming or additional components.
Is the LT8306RS6#TRPBF qualified for automotive applications?
Yes, the LT8306RS6#TRPBF is AEC-Q100 qualified for automotive applications (Grade 1: −40°C to +125°C ambient, −40°C to +150°C junction). It includes built-in overtemperature protection, precise EN/UVLO with hysteresis for battery transient immunity, and guaranteed operation across the full automotive temperature range - making it suitable for engine control units, ADAS domain controllers, and body electronics where reliability and qualification are mandatory. This is explicitly stated in the Features and Absolute Maximum Ratings sections of the LT8306 datasheet Rev A.
LT8306RS6#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Flyback
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 60V
- Frequency - Switching:
- 10kHz ~ 400kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT8306RS6#TRPBF FAQ
1.How can I place an order for LT8306RS6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8306RS6#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 LT8306RS6#TRPBF reliable?
The price and inventory of LT8306RS6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8306RS6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8306RS6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8306RS6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8306RS6#TRPBF?
LT8306RS6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8306RS6#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 LT8306RS6#TRPBF?
For technical support, including LT8306RS6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8306RS6#TRPBF requirements.
6.How does Aetrix verify that LT8306RS6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8306RS6#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 LT8306RS6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8306RS6#TRPBF?
All LT8306RS6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8306RS6#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 LT8306RS6#TRPBF part is unused and in its original packaging.
Return procedure for LT8306RS6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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