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Analog Devices Inc. LT8316EFE#TRPBF
- Part No.:
- LT8316EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Datasheet:
-
LT8316EFE#TRPBF.pdf
- Description:
- 600VIN MICROPOWER, ISOLATED NO-O
- Quantity:
- Payment:
- Shipping:
Inventory:14,548
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Product details
Overview
LT8316EFE#TRPBF from Analog Devices is a micropower, high-voltage isolated flyback controller enabling opto-isolator–free regulation via tertiary-winding voltage sampling. It operates from 16V to 560V input, delivers up to 4A output current at high VIN, features quasi-resonant boundary-mode control, and achieves 75μA quiescent current - ideal for isolated housekeeping supplies in industrial and automotive systems.
For engineers reviewing the LT8316EFE#TRPBF datasheet, LT8316EFE#TRPBF pinout, LT8316EFE#TRPBF application, or LT8316EFE#TRPBF equivalent, key selection considerations include its 560V input rating, no-opto feedback architecture, programmable constant-current/constant-voltage regulation, TSSOP-20(16) package with high-voltage creepage, and AEC-Q100-compliant variants.
Technical Context
The LT8316EFE#TRPBF implements boundary-mode (critical conduction mode) control using a DCM pin that detects dV/dt of the tertiary winding to trigger precise zero-current sampling. Its internal depletion-mode startup FET charges INTVCC without external components, and the GM transconductance amplifier (245–455 μS) drives VC for frequency and peak-current control.
It integrates dual regulation loops: a voltage error amplifier referencing 1.22V at FB pin for CV operation, and an IREG/SS pin–based current regulation loop enabling CC mode. Temperature compensation is supported via TC pin (1.22V @ 25°C, +4.1 mV/°C) to offset diode VF drift across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 16V to 560V continuous (600V transient); enables direct off-line and battery-stack interfacing without pre-regulation. |
| Quiescent Current | 75μA in Burst Mode; minimizes standby power loss in always-on isolated supplies. |
| FB Regulation Voltage | 1.22V ±3mV over temperature; sets precision output voltage reference for tertiary-winding feedback divider. |
| Switching Frequency Range | 3.5kHz–140kHz; auto-adjusts between boundary mode and discontinuous mode to optimize efficiency vs. light-load ripple. |
| SENSE Threshold Range | 20mV to 110mV; defines programmable peak current limit for MOSFET protection and output current regulation. |
| TC Pin Tempco | +4.1 mV/°C PTAT voltage; compensates output diode forward-voltage drift to maintain ±5% output accuracy over –40°C to 125°C. |
| Package | 20(16)-lead TSSOP with extended creepage; pins 1–3 are VIN (560V-rated), exposed pad (Pin 21) is GND for thermal management. |
Pinout & Package
LT8316EFE#TRPBF uses a thermally enhanced 20(16)-lead plastic TSSOP package (FE grade) with high-voltage spacing: Pins 1, 2, 3 are VIN (560V drain of internal depletion FET); exposed pad (Pin 21) is GND and must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2,3) | High-voltage input / startup FET drain | Accepts 16–560V input; internal depletion FET charges INTVCC at startup - eliminates external bleeder resistor. |
| INTVCC (8) | Internal gate driver bias supply | Regulated 10V LDO output; requires ≥2.2μF ceramic bypass capacitor for stable gate drive. |
| BIAS (9) | Unregulated auxiliary supply input | Derives operating power from transformer tertiary winding; reduces standby dissipation vs. resistive startup. |
| DCM (10) | Boundary-mode detection input | Samples dV/dt of tertiary winding to trigger zero-current sampling - enables accurate opto-free regulation. |
| FB (12) | Feedback input | Sampled voltage regulated to 1.22V; connects to resistor divider from tertiary winding to set output voltage. |
| IREG/SS (14) | Current regulation / soft-start | 10μA sink current sets CC threshold; resistor-to-GND programs current limit, capacitor enables controlled startup. |
| GATE (19) | MOSFET gate driver output | 30ns rise / 8ns fall time; drives external N-channel MOSFET with minimal dead-time loss in high-frequency boundary mode. |
| GND (15,20) | Signal and power ground | Dual ground pins reduce noise coupling; exposed pad (Pin 21) is thermal GND and must be connected. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Uses tertiary-winding flyback pulse sampling instead of optocoupler - eliminates aging, nonlinearity, and extra BOM cost. |
| Quasi-resonant boundary-mode control | Zero-current switching reduces EMI and transformer core loss while improving load regulation without additional compensation components. |
| Programmable CV/CC regulation | Independent FB (voltage) and IREG/SS (current) loops enable dual-mode output control - essential for LED drivers and battery chargers. |
| Integrated depletion-mode startup FET | Charges INTVCC directly from VIN at startup - removes need for high-voltage startup resistor and associated power loss. |
| Temperature-compensated feedback | TC pin provides PTAT voltage (+4.1 mV/°C) to offset diode VF drift - maintains stable output across –40°C to 125°C junction range. |
Applications
| Industrial Isolated Housekeeping Supply | Automotive Inverter Gate Drive Power |
|---|---|
Use Scenario: Providing isolated 12V/4A auxiliary power for PLC I/O modules and sensor interfaces in factory automation systems with wide-input 24–400V DC bus. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating output via tertiary winding; performs boundary-mode switching and CV/CC transition at load step changes. Use Value: Eliminates optocoupler and associated compensation network, reducing component count by ≥30% and improving long-term reliability in harsh environments. |
Use Scenario: Generating isolated gate-drive supplies for SiC MOSFET half-bridges in EV traction inverters, operating from 400–800V battery stacks. IC Role / Device Role / Timing Role: High-voltage flyback controller delivering tightly regulated 15V/2A per gate driver stage; uses TC pin compensation to maintain <±2% output accuracy over –40°C to 150°C. Use Value: Enables single-chip, no-opto solution meeting AEC-Q100 Grade 1 requirements while supporting >560V input transients common in EV power systems. |
| Medical Equipment Off-Line Auxiliary Supply | Telecom Remote Radio Unit (RRU) Power |
Use Scenario: Isolated 5V/1A standby supply for patient-monitoring front-end circuitry, required to meet IEC 60601 creepage and leakage standards. IC Role / Device Role / Timing Role: Flyback controller in 20(16)-lead TSSOP package with extended creepage; implements low-ripple Burst Mode at light loads to meet <100mW standby limits. Use Value: Achieves 75μA quiescent current and certified high-voltage spacing - satisfies stringent medical isolation and energy-efficiency mandates without redesign. |
Use Scenario: Multi-output isolated supply (±12V, 3.3V) powering RF amplifiers and digital baseband in outdoor 5G RRUs powered from -48V telecom rectifiers. IC Role / Device Role / Timing Role: Primary controller managing three secondary windings via single FB/TC network; leverages SMODE pin to enter 220Hz Standby Mode during low-traffic periods. Use Value: Reduces minimum load requirement from ~1% to ~0.05% of full scale - extends system uptime during deep-sleep states while maintaining regulation integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28740DR | Requires optocoupler feedback; lower max input (450V); fixed 65kHz frequency vs. variable boundary mode. | Lacks no-opto capability and CV/CC dual regulation; suited for cost-sensitive, lower-power (<30W) designs where opto tolerance is acceptable. | Select UCC28740DR only if optocoupler integration is preferred and input voltage stays below 450V - not suitable for 560V industrial or EV applications. |
| MAX17690ATP+T | Supports 600V input but uses primary-side sensing with different DCM architecture; no integrated TC pin or programmable CC regulation. | Offers higher integration (integrated gate driver) but lacks temperature-compensated diode VF correction - output accuracy degrades >±10% over temperature. | Choose MAX17690ATP+T when gate driver integration is prioritized over output stability; verify diode tempco impact on final design. |
Compared with UCC28740DR and MAX17690ATP+T, the LT8316EFE#TRPBF uniquely combines 560V input, no-opto tertiary-winding regulation, dual CV/CC loops, and active temperature compensation - making it the only option capable of maintaining ±5% output accuracy across –40°C to 125°C in high-reliability isolated supplies.
Availability
LT8316EFE#TRPBF is available at Aetrix Electronics and suitable for industrial automation, automotive inverter gate drive, medical auxiliary power, and telecom RRU applications requiring stable component supply, high-voltage isolation, and long-lifecycle support.
Supply support for LT8316EFE#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 signal chain and power solutions.
The LT8316EFE#TRPBF belongs to Analog Devices' high-voltage isolated power controller product line, designed specifically for opto-free, wide-input flyback topologies in safety-critical and space-constrained applications where reliability, efficiency, and thermal performance are paramount.
FAQ
What is the maximum continuous input voltage rating for the LT8316EFE#TRPBF?
The LT8316EFE#TRPBF has a maximum continuous input voltage rating of 560V at the VIN pins (1, 2, 3), with a transient withstand rating of 600V. This allows direct connection to high-voltage DC buses found in industrial motor drives, EV battery stacks, and telecom rectifier outputs without external pre-regulation stages. Operation above 560V continuously may degrade long-term reliability.
How does the LT8316EFE#TRPBF achieve regulation without an optocoupler?
The LT8316EFE#TRPBF samples the flyback pulse voltage from a dedicated tertiary winding on the transformer via the FB pin. Using boundary-mode timing and the DCM pin to detect zero-current crossing, it captures the output voltage scaled by the turns ratio - eliminating optocoupler latency, aging, and nonlinearities. This architecture is validated in the LT8316EFE#TRPBF's typical application circuits and achieves ±5% output accuracy across load and temperature.
Can the LT8316EFE#TRPBF support both constant-voltage and constant-current output modes?
Yes, the LT8316EFE#TRPBF supports dual-mode regulation: constant-voltage (CV) via the FB pin referenced to 1.22V, and constant-current (CC) via the IREG/SS pin, which sinks 10μA to set the current limit threshold. When output current reaches the IREG/SS–defined level, the controller transitions from CV to CC mode - a feature confirmed in the LT8316EFE#TRPBF datasheet's CV/CC Operation section and typical waveforms.
What is the purpose of the TC pin on the LT8316EFE#TRPBF, and how is it used?
The TC pin on the LT8316EFE#TRPBF provides a buffered proportional-to-absolute-temperature (PTAT) voltage (1.22V at 25°C, +4.1 mV/°C) to compensate for the negative temperature coefficient of the output rectifier diode. By connecting a resistor from TC to FB, the LT8316EFE#TRPBF counteracts diode VF drift - maintaining stable output voltage across –40°C to 125°C. This function is explicitly detailed in the LT8316EFE#TRPBF Applications Information section.
Is the LT8316EFE#TRPBF pin-compatible with other variants in the LT8316 family?
Yes, the LT8316EFE#TRPBF shares identical pinout and footprint with all LT8316FE-grade variants (e.g., LT8316IFE#TRPBF, LT8316HFE#TRPBF), including the 20(16)-lead TSSOP package, VIN pin assignment (1,2,3), and exposed pad (Pin 21) as GND. Differences lie only in temperature grade (E = –40°C to 125°C), packaging markings, and AEC-Q100 compliance - not in electrical or mechanical compatibility.
LT8316EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost, Flyback
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 16V ~ 600V
- Frequency - Switching:
- 220Hz ~ 140kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- -
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8316EFE#TRPBF FAQ
1.How can I place an order for LT8316EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8316EFE#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 LT8316EFE#TRPBF reliable?
The price and inventory of LT8316EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8316EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8316EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8316EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8316EFE#TRPBF?
LT8316EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8316EFE#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 LT8316EFE#TRPBF?
For technical support, including LT8316EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8316EFE#TRPBF requirements.
6.How does Aetrix verify that LT8316EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8316EFE#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 LT8316EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8316EFE#TRPBF?
All LT8316EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8316EFE#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 LT8316EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8316EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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