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Analog Devices Inc. LT8316IFE#TRPBF
- Part No.:
- LT8316IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Datasheet:
-
LT8316IFE#TRPBF.pdf
- Description:
- 600VIN MICROPOWER, ISOLATED NO-O
- Quantity:
- Payment:
- Shipping:
Inventory:2,590
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Product details
Overview
LT8316IFE#TRPBF from Analog Devices is a micropower, high-voltage isolated flyback controller IC designed for primary-side regulation without opto-isolators. 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 in Burst Mode - enabling compact, efficient off-line power supplies for industrial and automotive housekeeping rails.
For engineers reviewing the LT8316IFE#TRPBF datasheet, LT8316IFE#TRPBF pinout, LT8316IFE#TRPBF application, or LT8316IFE#TRPBF equivalent, key selection considerations include its 560V VIN rating, no-opto isolation architecture, programmable constant-current/constant-voltage regulation, TSSOP-20(15) package with high-voltage creepage, and AEC-Q100-compliant I-grade temperature range (–40°C to 125°C).
Technical Context
The LT8316IFE#TRPBF implements primary-side sensing via a third transformer winding, using a sample-and-hold circuit triggered by DCM pin dV/dt detection to capture FB voltage at near-zero secondary current - eliminating opto-isolator drift and aging. Its internal depletion-mode startup FET charges INTVCC without external bleeder components, and boundary-mode operation ensures zero-current switching for high efficiency and reduced EMI.
It integrates dual regulation loops: a GM transconductance amplifier for constant-voltage (CV) control referenced to 1.22V at FB, and a current-regulation loop set by IREG/SS pin current (10μA out), enabling seamless CV/CC transition. Temperature compensation is implemented via TC pin's PTAT voltage (+4.1mV/°C) to offset diode VF drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 16V to 560V continuous (600V transient); enables direct connection to rectified AC mains or high-voltage DC bus without pre-regulator. |
| Quiescent Current | 75μA in Burst Mode; minimizes standby power loss in always-on systems like EV battery monitors or telecom supervision rails. |
| FB Regulation Voltage | 1.22V ±3mV over temperature; sets precise output voltage via resistor divider on tertiary winding, independent of opto-isolator nonlinearity. |
| Switching Frequency Range | 3.5kHz–140kHz (boundary mode), down to 220Hz in Standby Mode; adapts dynamically to load while maintaining zero-current switching. |
| SENSE Threshold Range | 20mV to 110mV; defines peak current limit for MOSFET protection and output current regulation scalability. |
| TC Pin Output | 1.22V @ 25°C, +4.1mV/°C PTAT; enables accurate diode-forward-voltage compensation across –40°C to 125°C operating range. |
| Package | 20(15)-lead TSSOP with extended creepage; pins 1–3 are isolated high-voltage VIN inputs; exposed pad (Pin 21) is GND for thermal management. |
Pinout & Package
The LT8316IFE#TRPBF is housed in a thermally enhanced 20(15)-lead plastic TSSOP package (FE grade) with high-voltage spacing between VIN pins (1, 2, 3) and low-voltage pins. The exposed pad (Pin 21) must be soldered to PCB ground for thermal performance. Pin count excludes removed leads for creepage compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1, 2, 3) | Drain of internal 560V depletion startup FET | Accepts high-voltage input; powers INTVCC during startup and supports up to 600V transient stress. |
| 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 FB sampling at valley of flyback pulse for accurate 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 current source sets CC limit point; RC network here provides programmable soft-start ramp. |
| GATE (19) | High-side N-MOSFET driver output | 30ns rise / 8ns fall time drives external power switch; supports >100W designs with low gate charge loss. |
| GND (15, 20) | Signal and power ground reference | Dual ground pins reduce noise coupling; exposed pad (Pin 21) is mandatory GND connection for thermal conduction. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates optocoupler cost, size, aging, and bandwidth limitations by sampling tertiary winding flyback pulse at zero-current crossing. |
| Quasi-resonant boundary-mode control | Enables zero-current switching, improves load regulation, reduces transformer size, and avoids subharmonic oscillation without slope compensation. |
| Programmable CV/CC regulation | Simultaneous constant-voltage (via FB) and constant-current (via IREG/SS) loops support battery charging, LED drivers, and multi-rail supplies. |
| Integrated depletion-mode startup FET | Charges INTVCC capacitor directly from VIN at startup - removes need for external bleeder resistor or auxiliary supply. |
| Temperature-compensated output | TC pin's PTAT voltage (+4.1mV/°C) offsets diode VF drift, enabling <±5% output voltage accuracy over full –40°C to 125°C range. |
Applications
| Isolated Telecom Housekeeping Supply | Automotive Battery Stack Monitor PSU |
|---|---|
Use Scenario: Providing isolated 5V/3.3V bias rails for supervisory microcontrollers and ADCs in 48V–800V telecom rectifier modules. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating output from tertiary winding; replaces opto-coupled feedback with deterministic sampling timing synchronized to flyback valley. Use Value: Achieves <±3% output accuracy over line/load/temperature without opto aging, reducing BOM count and field failure risk in 15+ year infrastructure deployments. | Use Scenario: Generating isolated 12V/15V rails for gate drivers and CAN transceivers in electric vehicle battery management systems (BMS) with 200–600V stack voltages. IC Role / Device Role / Timing Role: High-voltage flyback controller implementing AEC-Q100-compliant I-grade operation; uses SMODE pin to enable 220Hz standby mode for ultra-low-power sleep states. Use Value: Enables <100μA system standby current while maintaining fast wake-up response, extending battery monitor uptime between cell balancing cycles. |
| Industrial Inverter Gate Drive Power | Medical Isolated Auxiliary Supply |
Use Scenario: Delivering isolated ±15V dual outputs for IGBT/SiC gate drivers in motor drives and renewable energy inverters operating from 300–600V DC links. IC Role / Device Role / Timing Role: Multi-output flyback controller with programmable current limit (SENSE pin) and soft-start (IREG/SS) to manage inrush into gate driver capacitors. Use Value: Supports up to 4A peak output at high VIN, enabling single-controller solutions for high-power gate drive without secondary-side regulation complexity. | Use Scenario: Powering isolated patient-monitoring circuits (ECG, SpO₂ sensors) requiring reinforced insulation and low leakage current in Class II medical equipment. IC Role / Device Role / Timing Role: Isolated flyback controller certified to AEC-Q100 Exception and HBM ESD Class 1C (±1000V); uses TC compensation to maintain output stability across ambient temperature shifts in clinical environments. Use Value: Meets IEC 60601-1 creepage requirements via 20(15)-lead TSSOP layout and eliminates opto-isolator reliability concerns in safety-critical signal chains. |
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 | Lower max VIN (450V), no integrated startup FET, requires external bias supply; fixed 65kHz frequency vs. variable boundary mode. | Targeted at cost-sensitive consumer adapters; lacks AEC-Q100 qualification and TC compensation for precision medical/automotive use. | Select UCC28740DR only if input voltage stays below 450V and opto-isolation is acceptable for lower-cost, non-safety-critical designs. |
| MAX17690ATP+T | Higher quiescent current (220μA), no TC pin, limited to 400V VIN; uses different boundary detection method without DCM pin. | Optimized for industrial PLCs with moderate voltage ranges; does not support the same level of output voltage temperature stability or high-VIN robustness. | Choose MAX17690ATP+T when designing for ≤400V inputs and where ±1% output drift over temperature is acceptable. |
Compared with UCC28740DR and MAX17690ATP+T, the LT8316IFE#TRPBF uniquely combines 560V VIN capability, no-opto regulation, integrated depletion startup FET, and active temperature compensation - making it the only option qualified for AEC-Q100 I-grade automotive battery monitoring and high-reliability medical auxiliary supplies.
Availability
LT8316IFE#TRPBF is available at Aetrix Electronics and suitable for isolated telecom housekeeping supplies, automotive battery stack monitors, industrial inverter gate drive power, and medical auxiliary supplies requiring stable component supply across long product lifecycles.
Supply support for LT8316IFE#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 digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LT8316IFE#TRPBF belongs to Analog Devices' Power by Linear™ isolated controller family, engineered specifically for high-voltage, no-opto flyback topologies in space-constrained, safety-critical applications demanding AEC-Q100 compliance and long-term reliability.
FAQ
What is the maximum continuous input voltage rating for the LT8316IFE#TRPBF?
The LT8316IFE#TRPBF has a maximum continuous input voltage rating of 560V at the VIN pins (1, 2, 3). It supports transient overvoltage up to 600V per Absolute Maximum Ratings. This allows direct interface with rectified 400VAC mains or high-voltage DC bus systems without external clamping or pre-regulation - a key capability distinguishing the LT8316IFE#TRPBF from most competing controllers.
How does the LT8316IFE#TRPBF achieve regulation without an opto-isolator?
The LT8316IFE#TRPBF samples the flyback pulse voltage from a dedicated tertiary winding on the transformer at the precise moment when secondary current falls to zero - detected via dV/dt on the DCM pin. This sampled voltage, fed to the FB pin, is regulated to 1.22V internally. Because the sampling occurs at near-zero current, parasitic resistive drops are eliminated, enabling accurate, drift-free regulation without opto-isolator components - a core functional advantage of the LT8316IFE#TRPBF.
What is the purpose of the TC pin on the LT8316IFE#TRPBF, and how is it used?
The TC pin on the LT8316IFE#TRPBF provides a buffered proportional-to-absolute-temperature (PTAT) voltage (1.22V at 25°C, +4.1mV/°C) to compensate for the negative temperature coefficient of the output rectifier diode's forward voltage. By connecting a resistor (RTC) from TC to FB, the LT8316IFE#TRPBF actively corrects output voltage drift - enabling <±5% accuracy over –40°C to 125°C, a critical feature for automotive and medical applications where the LT8316IFE#TRPBF is commonly deployed.
Can the LT8316IFE#TRPBF support both constant-voltage and constant-current output modes?
Yes, the LT8316IFE#TRPBF implements dual-loop regulation: a voltage loop (via FB pin referenced to 1.22V) for constant-voltage (CV) operation and a current loop (via IREG/SS pin's 10μA current source) for constant-current (CC) regulation. When output current reaches the IREG/SS-set threshold, the controller transitions seamlessly to CC mode - making the LT8316IFE#TRPBF suitable for LED drivers, battery chargers, and other dual-mode power applications.
What is the significance of the "IFE" suffix in LT8316IFE#TRPBF?
The "IFE" suffix in LT8316IFE#TRPBF denotes the Industrial grade with extended temperature range (–40°C to 125°C junction), packaged in the 20(15)-lead TSSOP (FE) variant with high-voltage creepage spacing. It is distinct from "EFE" (commercial grade) and "HFE" (high-temp grade), and is the version qualified for AEC-Q100 with exception - confirming its suitability for automotive and industrial environments where the LT8316IFE#TRPBF is specified.
LT8316IFE#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
LT8316IFE#TRPBF FAQ
1.How can I place an order for LT8316IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8316IFE#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 LT8316IFE#TRPBF reliable?
The price and inventory of LT8316IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8316IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8316IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8316IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8316IFE#TRPBF?
LT8316IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8316IFE#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 LT8316IFE#TRPBF?
For technical support, including LT8316IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8316IFE#TRPBF requirements.
6.How does Aetrix verify that LT8316IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8316IFE#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 LT8316IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8316IFE#TRPBF?
All LT8316IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8316IFE#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 LT8316IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8316IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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