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Analog Devices Inc. LT8306RS6#WTRPBF
- Part No.:
- LT8306RS6#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT8306RS6#WTRPBF.pdf
- Description:
- 60V LOW-IQ NO-OPTO ISO. FLYBACK
- Quantity:
- Payment:
- Shipping:
Inventory:3,897
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Product details
Overview
LT8306RS6#WTRPBF 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 feedback, uses boundary mode for heavy loads and low-ripple burst mode for light loads, delivers up to 4A output at 12V, and supports automotive AEC-Q100 qualification.
For engineers reviewing the LT8306RS6#WTRPBF datasheet, LT8306RS6#WTRPBF pinout, LT8306RS6#WTRPBF application, or LT8306RS6#WTRPBF equivalent, key selection criteria include primary-side sensing accuracy, 8V gate drive capability, 120μA sleep-mode IQ, minimum load <0.5% of full scale, and AEC-Q100 compliance for automotive auxiliary power designs.
Technical Context
The LT8306RS6#WTRPBF implements current-mode control with boundary conduction mode (BCM) at heavy loads and low-ripple burst mode at light loads, enabling high efficiency across 0.04A–4A output range. Its flyback pulse-sense circuit samples reflected output voltage during zero-secondary-current intervals, eliminating need for opto-isolators or auxiliary windings.
It integrates internal compensation, soft-start, 8V gate driver, EN/UVLO with 1.228V enable threshold and 18mV hysteresis, and output short-circuit protection. The device operates from 4.5V to 60V input and maintains regulation via single RFB resistor tied to transformer primary switch node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V - supports wide-input industrial and automotive battery systems including 12V/24V/36V rails. |
| Quiescent Current | 120μA sleep mode / 390μA active mode - enables ultra-low standby power for always-on auxiliary supplies. |
| Switching Frequency | 7.5kHz–440kHz - dynamically adjusts between BCM, DCM, and burst modes to optimize efficiency vs. load. |
| GATE Drive Voltage | 7.5V–8.5V - provides robust N-channel MOSFET drive with 60ns rise / 30ns fall time into 3.3nF load. |
| RFB Regulation Current | 97.5–102.5μA - sets output voltage via single external resistor using trimmed 1.0V reference and internal 10kΩ resistor. |
| SENSE Threshold | 9–25mV min / 85–105mV max - enables precise current limiting with Kelvin-sensed source resistor on low-side MOSFET. |
| EN/UVLO Hysteresis | 18mV - ensures stable enable/disable transition and allows programmable VIN undervoltage lockout with resistor divider. |
Pinout & Package
Package: 6-lead TSOT-23 (S6), θJA = 192°C/W, θJC = 51°C/W, rated for –40°C to +150°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SENSE | Current-sense comparator input | Kelvin-connected to positive terminal of source-resistor; senses MOSFET current for cycle-by-cycle limiting. |
| 2 GND | Power and signal ground | Must tie directly to ground plane; serves as return path for gate drive, sense, and feedback circuits. |
| 3 GATE | N-channel MOSFET gate driver output | Drives external NFET with 8V swing; requires local decoupling and low-inductance layout to minimize ringing. |
| 4 RFB | External feedback resistor connection | Connects to transformer primary switch node; sets output voltage via IRFB × RFB relationship (IRFB ≈ 100μA). |
| 5 VIN | Main input supply and reference | Supplies internal circuitry; must be locally bypassed with ceramic capacitor; reference for RFB feedback network. |
| 6 EN/UVLO | Enable and undervoltage lockout input | Pull below 0.2V to shut down; 1.228V enable threshold with 18mV hysteresis; supports programmable UVLO using resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolation | Eliminates optocoupler and third winding - reduces BOM count, improves reliability, avoids aging-related drift. |
| Boundary conduction mode | Enables zero-current switching at turn-on - minimizes transformer size, improves load regulation, avoids subharmonic oscillation. |
| Low-ripple burst mode | Maintains <100mVpp output ripple at light loads - eliminates audible noise and EMI spikes common in standard burst modes. |
| Single-resistor VOUT programming | Output voltage set by one external RFB resistor - simplifies design, removes need for precision voltage dividers or secondary-side components. |
| AEC-Q100 qualified | Rated for automotive applications - meets stress testing requirements for temperature, humidity, vibration, and lifetime reliability. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Housekeeping |
|---|---|
Use Scenario: Providing isolated 12V/4A bias supply for ADAS domain controllers, infotainment head units, and body control modules from 9–36V vehicle battery. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating output without optocoupler; samples flyback pulse during zero-secondary-current intervals for accurate voltage feedback. Use Value: Enables compact, AEC-Q100-compliant power solution with <0.5% minimum load requirement - ideal for systems with variable or intermittent downstream loads. | Use Scenario: Generating isolated 5V/2A auxiliary rail for PLC I/O modules, motor drives, and fieldbus gateways operating from 24VDC industrial bus. IC Role / Device Role / Timing Role: No-opto flyback controller implementing boundary mode at full load and low-ripple burst mode at standby - maintains >85% efficiency from 10mA to full load. Use Value: Reduces component count by eliminating optocoupler and third winding while meeting stringent EMC and safety isolation standards (IEC 61000-4-x, UL 62368). |
| Medical Equipment Isolation | Telecom DC-DC Conversion |
Use Scenario: Delivering isolated 3.3V/1A power to patient-monitoring sensor front-ends requiring reinforced insulation and low leakage current. IC Role / Device Role / Timing Role: Isolated flyback controller using primary-side sensing to meet 4kV AC reinforced isolation requirements without compromising regulation accuracy. Use Value: Achieves ±5% output regulation across line, load, and temperature with no secondary-side feedback components - simplifies certification and reduces creepage/clearance layout complexity. | Use Scenario: Generating isolated -48V backup bias for telecom line cards and optical transceivers from intermediate 12V or 24V backplane rails. IC Role / Device Role / Timing Role: High-voltage flyback controller supporting 60V input with robust EN/UVLO hysteresis - ensures reliable startup and brownout recovery in noisy telecom environments. Use Value: Supports wide input range and 120μA sleep current - extends hold-up time during AC interruption and reduces standby power in distributed power architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMSE#PBF | Requires third-winding feedback; higher 250μA quiescent current; supports up to 100V input. | Less suitable for space-constrained designs due to extra transformer winding; better for high-VIN telecom where third winding is acceptable. | Select when third-winding implementation is preferred and higher input voltage (>60V) is required. |
| UCC28911DR | No-opto architecture; 700V integrated MOSFET; fixed 130kHz frequency; no burst mode - higher light-load ripple. | Higher integration but limited to ≤700V MOSFET; lacks low-ripple burst mode and AEC-Q100 qualification. | Select for cost-sensitive, non-automotive applications where integrated FET simplifies layout and 60V+ input is not needed. |
Compared with LT3748EMSE#PBF and UCC28911DR, the LT8306RS6#WTRPBF uniquely combines no-opto operation, AEC-Q100 qualification, low-ripple burst mode, and 120μA sleep current - making it optimal for compact, automotive-grade isolated auxiliary supplies where size, efficiency, and reliability are critical.
Availability
LT8306RS6#WTRPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial housekeeping supplies, and medical isolated bias rails requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8306RS6#WTRPBF 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.
The LT8306RS6#WTRPBF belongs to Analog Devices' Power by Linear™ isolated controller product line, designed specifically for compact, high-efficiency, no-opto flyback power supplies targeting automotive, industrial, and medical applications.
FAQ
What is the minimum load requirement for stable regulation of the LT8306RS6#WTRPBF?
The LT8306RS6#WTRPBF maintains stable regulation with a minimum load of less than 0.5% of full output current - typically ~20mA for a 4A design. This is enabled by its low-ripple burst mode, which sustains sampling integrity even at very light loads. The device does not require dummy loads or post-regulation circuitry to meet this specification, and the 10kHz minimum switching frequency ensures consistent output voltage sampling during burst cycles. This behavior is confirmed across temperature and input voltage ranges per Table 1 and Figure 4 in the official datasheet.
How is output voltage programmed on the LT8306RS6#WTRPBF without an optocoupler?
The LT8306RS6#WTRPBF programs output voltage using a single external resistor (RFB) connected between the RFB pin and the transformer primary switch node. The device senses the reflected flyback pulse amplitude during zero-secondary-current intervals and compares it against an internal 1.0V reference. With a nominal RFB regulation current of 100μA, the output voltage follows VOUT ≈ (100μA × RFB / NPS) − VF, where NPS is the transformer turns ratio and VF is the output diode forward voltage. This method eliminates optocouplers and third windings while maintaining ±5% regulation accuracy across line, load, and temperature.
Does the LT8306RS6#WTRPBF support AEC-Q100 qualification, and what grade is it rated for?
Yes, the LT8306RS6#WTRPBF is AEC-Q100 qualified and rated for Grade 1 (−40°C to +125°C ambient) and Grade 0 (−40°C to +150°C junction) operation. The datasheet explicitly states "AEC-Q100 Qualified for Automotive Applications" in the Features section and specifies an operating junction temperature range of −40°C to +150°C in Table 2. This qualification covers stress tests including temperature cycling, humidity bias, and high-temperature operating life - confirming suitability for under-hood and infotainment power supply applications.
What is the purpose of the SENSE pin on the LT8306RS6#WTRPBF, and how should it be connected?
The SENSE pin on the LT8306RS6#WTRPBF is the current-sense comparator input used for cycle-by-cycle peak current limiting of the external N-channel MOSFET. It must be Kelvin-connected to the positive terminal of a low-value current-sense resistor placed in the source path of the MOSFET, with the resistor's negative terminal tied directly to the ground plane near the IC. This configuration minimizes PCB trace inductance and ensures accurate sensing of the MOSFET source current. The SENSE pin accepts thresholds from 9mV to 105mV, and exceeding 160mV triggers overcurrent shutdown - protecting both the MOSFET and transformer during fault conditions.
Can the LT8306RS6#WTRPBF drive high-side or low-side MOSFET configurations?
The LT8306RS6#WTRPBF is designed exclusively for low-side N-channel MOSFET drive - its GATE pin provides a ground-referenced 8V output that switches between 0V and ~8V. It cannot drive high-side configurations or P-channel devices. The controller relies on the MOSFET's source being connected to ground (or a low-impedance ground plane), with the SENSE pin monitoring current through a source resistor. Attempting to use it with high-side topology would violate the SENSE pin's voltage rating (−0.3V to +0.3V) and disable proper current sensing. All reference designs, including Figure 1, confirm low-side configuration only.
LT8306RS6#WTRPBF 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#WTRPBF FAQ
1.How can I place an order for LT8306RS6#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8306RS6#WTRPBF 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#WTRPBF reliable?
The price and inventory of LT8306RS6#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8306RS6#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT8306RS6#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8306RS6#WTRPBF transactions.
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4.How is shipping managed for LT8306RS6#WTRPBF?
LT8306RS6#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8306RS6#WTRPBF 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#WTRPBF?
For technical support, including LT8306RS6#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8306RS6#WTRPBF requirements.
6.How does Aetrix verify that LT8306RS6#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT8306RS6#WTRPBF 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#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT8306RS6#WTRPBF?
All LT8306RS6#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8306RS6#WTRPBF, 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#WTRPBF part is unused and in its original packaging.
Return procedure for LT8306RS6#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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