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Analog Devices Inc. LT8316IF#PBF
- Part No.:
- LT8316IF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 15 Leads
- Datasheet:
-
LT8316IF#PBF.pdf
- Description:
- 560VIN MICROPOWER, ISOLATED NO-O
- Quantity:
- Payment:
- Shipping:
Inventory:3,846
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Product details
Overview
LT8316IF#PBF 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 operation, and achieves 75μA quiescent current in Burst Mode - enabling efficient off-line housekeeping supplies in electric vehicles and industrial systems.
For engineers reviewing the LT8316IF#PBF datasheet, LT8316IF#PBF pinout, LT8316IF#PBF application, or LT8316IF#PBF equivalent, key selection considerations include its 560V VIN rating, third-winding output sensing architecture, programmable constant-current/constant-voltage regulation, TSSOP-20(15) package with extended creepage, and AEC-Q100-compliant temperature range (–40°C to 125°C).
Technical Context
The LT8316IF#PBF implements primary-side regulation via sampling of the flyback pulse across a transformer tertiary winding, eliminating opto-isolator dependency. Its boundary-mode control uses DCM pin dV/dt detection to trigger sample-and-hold of FB voltage at near-zero secondary current, ensuring accurate load regulation without secondary-side components.
Startup is enabled by an internal depletion-mode FET charging INTVCC to 12V; normal operation draws power from BIAS via the tertiary winding. The device integrates a 10μA IREG/SS current source for programmable current limit, a PTAT TC pin (+4.1mV/°C) for diode forward-voltage temperature compensation, and a GM transconductance amplifier (245–455μS) for loop stability.
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 isolated supplies like EV battery stack monitors. |
| FB Regulation Voltage | 1.22V ±30mV over temperature; sets precision output voltage reference for third-winding feedback divider. |
| Switching Frequency Range | 3.5kHz–140kHz (Burst Mode to max); variable-frequency boundary mode reduces EMI and improves efficiency vs fixed-frequency alternatives. |
| Current Sense Threshold | 20mV–110mV adjustable via RSNS; supports peak-current-mode control with 100mV hard limit for overcurrent protection. |
| Temperature Range | –40°C to +125°C junction; qualified for automotive and industrial environments per AEC-Q100 with exception. |
| Package | 20(15)-lead plastic TSSOP with high-voltage spacing; exposed pad (Pin 21) tied to GND for thermal management. |
Pinout & Package
LT8316IF#PBF is housed in a thermally enhanced 20(15)-lead plastic TSSOP package (FE grade), featuring extended creepage distance between high-voltage pins (VIN 1/2/3) and low-voltage signals. The exposed pad (Pin 21) must be soldered to PCB ground for thermal performance. Pin count reduction (15 active pins) provides high-voltage isolation spacing per safety standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2,3) | Drain of internal 560V startup depletion FET | Accepts high-voltage input; powers INTVCC during startup and withstands 600V transients. |
| INTVCC (8) | Internal gate driver bias supply | Regulated 10V LDO output; requires ≥2.2μF ceramic bypass for stable gate drive. |
| BIAS (9) | Unregulated auxiliary supply input | Derives operating power from transformer tertiary winding; bypass with ≥100nF capacitor. |
| DCM (10) | Boundary mode detector input | Samples dV/dt of tertiary winding to trigger zero-current sampling; enables accurate primary-side regulation. |
| TC (11) | Temperature compensation reference | PTAT voltage (1.22V @ 25°C, +4.1mV/°C); compensates output diode VF drift in CV/CC supplies. |
| FB (12) | Feedback input | Sampled tertiary-winding voltage regulated to 1.22V; determines output voltage via RFB1/RFB2 divider. |
| VC (13) | Loop compensation node | Error amplifier output; sets switching frequency and peak current limit via external RC network. |
| IREG/SS (14) | Current regulation / soft-start | 10μA current source; resistor-to-GND programs CC limit; capacitor enables controlled startup ramp. |
| SMODE (16) | Standby mode enable | Tie to INTVCC to reduce min frequency to 220Hz; cuts standby power for ultra-low-load applications. |
| EN/UVLO (17) | Enable / undervoltage lockout | 1.22V threshold with 65mV hysteresis; supports programmable UVLO or logic-level enable. |
| SENSE (18) | Current sense input | Monitors MOSFET source voltage; 20–110mV range sets peak current limit for overcurrent protection. |
| GATE (19) | High-side N-channel MOSFET driver | 30ns rise / 8ns fall time; drives external power switch with minimal gate charge loss. |
| GND (15,20) | Signal and power ground | Low-impedance return path; pins 15/20 and exposed pad (21) must connect to common ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates optocoupler, TL431, and secondary-side feedback components - reducing BOM cost, board area, and aging-related drift. |
| Quasi-resonant boundary mode | Enables zero-current switching, improving efficiency >90% at full load and allowing smaller magnetics than CCM designs. |
| Programmable CV/CC regulation | Independent voltage and current setpoints support battery charging, LED drivers, and multi-output gate-drive supplies. |
| 75μA Burst Mode quiescent current | Extends hold-up time and reduces no-load losses in always-on isolated supplies such as EV battery monitoring rails. |
| Integrated depletion-mode startup FET | Charges INTVCC without external bleeder resistor or startup circuit - simplifying design and improving reliability. |
| AEC-Q100 qualified (–40°C to 125°C) | Validated for automotive subsystems including battery management, ADAS housekeeping, and infotainment power rails. |
Applications
| Electric Vehicle Battery Stack Monitoring | Isolated Telecom Housekeeping Supply |
|---|---|
Use Scenario: Monitoring individual cell voltages in 400–800V EV battery packs using isolated ADC front-ends. IC Role / Device Role / Timing Role: Primary-side flyback controller providing isolated 12V/3A rail for ADC, MCU, and CAN transceivers - powered directly from battery stack midpoint. Use Value: Enables compact, high-reliability, opto-free isolation with <75μA standby draw - critical for minimizing self-discharge during vehicle dormancy. |
Use Scenario: Generating isolated 5V/2A and 3.3V/1A rails for baseband processors and PHYs in 48V telecom rectifiers. IC Role / Device Role / Timing Role: High-input flyback controller regulating multiple outputs via tertiary winding sensing - replacing dual opto-coupled converters. Use Value: Reduces component count by 30% and improves dynamic response vs opto-based solutions, supporting fast load transients in packet-switched networks. |
| Industrial Inverter Gate-Drive Power | Medical Isolated Auxiliary Supply |
Use Scenario: Providing isolated ±15V gate-drive supplies for SiC MOSFETs in motor drives and UPS systems. IC Role / Device Role / Timing Role: Dual-output flyback controller delivering tightly regulated, low-noise auxiliary rails - synchronized to main inverter switching via DCM pin. Use Value: Achieves <±1% cross-regulation and <10mVpp ripple without post-regulation LDOs - lowering system thermal load and cost. |
Use Scenario: Powering isolated patient-monitoring sensors and data-acquisition circuits in Class II medical equipment. IC Role / Device Role / Timing Role: Safety-certified flyback controller delivering 5V/500mA isolated rail compliant with IEC 60601-1 creepage requirements. Use Value: Meets reinforced insulation requirements via 20(15)-lead TSSOP layout and eliminates opto aging - ensuring long-term calibration stability. |
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 HV startup circuit; 100μA IQ in burst mode. | Lacks AEC-Q100 qualification; suited for industrial but not automotive-grade designs. | Choose UCC28740DR only if input voltage stays below 450V and automotive qualification is unnecessary. |
| MAX17690ATP+T | Higher IQ (120μA), no TC pin for diode temp compensation, fixed 65kHz frequency; supports up to 600V VIN. | Does not support true boundary-mode operation or programmable CV/CC; limited to voltage-only regulation. | Select MAX17690ATP+T when fixed-frequency operation and simpler compensation are preferred over adaptive efficiency. |
Compared with UCC28740DR and MAX17690ATP+T, the LT8316IF#PBF uniquely combines 560V continuous operation, 75μA quiescent current, integrated depletion-FET startup, and programmable CV/CC regulation - making it optimal for space-constrained, automotive-qualified, and ultra-low-power isolated supplies.
Availability
LT8316IF#PBF is available at Aetrix Electronics and suitable for electric vehicle battery monitoring, industrial inverter gate-drive power, and medical isolated auxiliary supplies requiring stable component supply, long-lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for LT8316IF#PBF 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 industrial, automotive, communications, and healthcare markets with precision power, signal chain, and timing solutions.
The LT8316IF#PBF belongs to Analog Devices' LT® Power Controller family, engineered specifically for high-voltage isolated DC/DC conversion where opto-isolator elimination, ultra-low standby power, and automotive-grade reliability are mandatory design requirements.
FAQ
What is the maximum continuous input voltage rating for the LT8316IF#PBF?
The LT8316IF#PBF has a maximum continuous input voltage rating of 560V, with transient capability up to 600V on the VIN pins. This allows direct interface with rectified 400VAC mains or high-voltage DC bus systems without external pre-regulation - a key differentiator from competing controllers rated ≤450V continuous.
How does the LT8316IF#PBF achieve regulation without an opto-isolator?
The LT8316IF#PBF samples the flyback pulse voltage from a dedicated tertiary winding on the transformer, using the DCM pin to detect zero-current crossing and the FB pin to regulate that sampled voltage to 1.22V. This primary-side sensing eliminates opto-isolators, TL431s, and secondary-side feedback components - reducing cost, size, and long-term drift.
What is the purpose of the TC pin on the LT8316IF#PBF?
The TC pin on the LT8316IF#PBF provides a buffered proportional-to-absolute-temperature (PTAT) voltage (1.22V at 25°C, +4.1mV/°C) used to compensate for the negative temperature coefficient of the output rectifier diode's forward voltage. Connecting RTC from TC to FB corrects output voltage drift across temperature - essential for stable CV/CC performance in battery chargers and medical supplies.
Can the LT8316IF#PBF support both constant-voltage and constant-current regulation simultaneously?
Yes, the LT8316IF#PBF implements dual-loop regulation: the FB pin controls constant-voltage (CV) mode by regulating tertiary-winding voltage to 1.22V, while the IREG/SS pin sets a programmable constant-current (CC) limit via a 10μA current source. When load demand exceeds the CC threshold, the controller transitions seamlessly to CC mode - ideal for LED drivers and battery charging applications.
What package variant does the LT8316IF#PBF use, and why is it significant?
The LT8316IF#PBF uses a 20(15)-lead plastic TSSOP package with extended creepage distance and removed pins for high-voltage spacing. This configuration meets reinforced insulation requirements for 560V operation, supports AEC-Q100 qualification, and eliminates need for slotting or spacing on PCB - simplifying safety certification for automotive and industrial isolation barriers.
LT8316IF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width), 15 Leads
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Boost, Buck, Flyback
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 16V ~ 560V
- Frequency - Switching:
- 3.5kHz ~ 140kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- 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
LT8316IF#PBF FAQ
1.How can I place an order for LT8316IF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8316IF#PBF 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 LT8316IF#PBF reliable?
The price and inventory of LT8316IF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8316IF#PBF is usually 5 days.
3.What payment methods are accepted for LT8316IF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8316IF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8316IF#PBF?
LT8316IF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8316IF#PBF 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 LT8316IF#PBF?
For technical support, including LT8316IF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8316IF#PBF requirements.
6.How does Aetrix verify that LT8316IF#PBF is sourced from the original manufacturer or authorized distributors?
All LT8316IF#PBF 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 LT8316IF#PBF meets industry standards.
7.What is the process for return or replacement of LT8316IF#PBF?
All LT8316IF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8316IF#PBF, 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 LT8316IF#PBF part is unused and in its original packaging.
Return procedure for LT8316IF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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