My Inquiry
My Account
Analog Devices Inc. LT8316IF#TRPBF
- Part No.:
- LT8316IF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 15 Leads
- Datasheet:
-
LT8316IF#TRPBF.pdf
- Description:
- 560VIN MICROPOWER, ISOLATED NO-O
- Quantity:
- Payment:
- Shipping:
Inventory:3,301
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8316IF#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 ≥160V input, and features quasi-resonant boundary-mode operation with 75μA quiescent current for telecom and industrial off-line power supplies.
For engineers reviewing the LT8316IF#TRPBF datasheet, LT8316IF#TRPBF pinout, LT8316IF#TRPBF application, or LT8316IF#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 temperature range (–40°C to 125°C).
Technical Context
The LT8316IF#TRPBF implements boundary-mode (critical conduction mode) control using a DCM pin that detects negative dV/dt on the transformer's tertiary winding to trigger precise zero-current sampling of FB voltage. Its internal depletion-mode startup FET charges INTVCC without external bleeder components, and the GM transconductance amplifier (350μS typ.) drives VC for frequency and peak-current control.
It integrates dual regulation loops: a voltage loop referencing 1.22V at FB with ±3mV tolerance, and a current loop set by 10μA out of IREG/SS pin, enabling simultaneous CV/CC operation. Temperature compensation is supported via TC pin (1.22V @ 25°C, +4.1mV/°C) to offset diode VF drift in low-voltage outputs.
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-regulation. |
| Quiescent Current | 75μA in Burst Mode; minimizes standby power loss in always-on isolated housekeeping supplies. |
| FB Regulation Voltage | 1.22V ±3mV over temperature; sets precision output voltage reference for third-winding feedback network. |
| Switching Frequency Range | 3.5kHz–140kHz; variable boundary-mode operation improves efficiency and reduces transformer size vs fixed-frequency designs. |
| Output Current Capability | Up to 4A at VIN ≥160V; determined by SENSE pin threshold (90–110mV) and boundary-mode duty-cycle scaling. |
| Package | 20(15)-lead TSSOP with extended creepage; pins 1–3 are VIN (560V-rated), exposed pad is GND-requires PCB thermal pad for 125°C junction operation. |
| AEC-Q100 Grade | Grade I (–40°C to 125°C); qualified for automotive subsystems including EV battery stack monitoring and gate drive supplies. |
Pinout & Package
LT8316IF#TRPBF uses a thermally enhanced 20(15)-lead plastic TSSOP package (FE grade) with high-voltage spacing: pins 1, 2, 3 are VIN (560V drain of internal startup FET); pin 21 (exposed pad) is GND and must be soldered to PCB ground plane for thermal management. Pin count reduction (vs full 20-lead) increases creepage distance between high- and low-voltage terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1, 2, 3) | High-voltage input / startup FET drain | Accepts 560V continuous input; internal depletion FET charges INTVCC at startup-no external resistor needed. |
| INTVCC (8) | Internal gate driver bias supply | Regulated 10V LDO output; requires ≥2.2μF ceramic bypass capacitor for stable gate drive under load transients. |
| BIAS (9) | Unregulated auxiliary supply input | Derives operating power from transformer tertiary winding; bypass with ≥100nF capacitor to reduce noise coupling. |
| 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 limit / soft-start programming | 10μA current source sets CC regulation point; resistor-to-GND programs current limit, capacitor enables soft-start. |
| GATE (19) | External MOSFET gate driver output | Drives N-channel primary-side switch with 30ns rise / 8ns fall time; supports >100W power delivery with low gate loss. |
| GND (15, 20) | Signal and power ground | Dual ground pins reduce ground bounce; exposed pad (pin 21) is mandatory GND connection for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolation | Eliminates optocoupler, TL431, and associated compensation components-reduces BOM cost, board area, and aging-related drift. |
| Quasi-resonant boundary-mode control | Enables zero-current switching, improving efficiency >90% at full load and allowing smaller magnetics than CCM designs. |
| Programmable CV/CC regulation | Supports constant-current LED drivers or battery chargers without secondary-side sensing-uses single IREG/SS pin for CC setpoint. |
| Low-ripple Burst Mode® | Maintains <1% output ripple at light loads by enforcing minimum off-time and controlled pulse skipping-critical for noise-sensitive analog circuits. |
| Integrated temperature-compensated reference | TC pin provides PTAT voltage (+4.1mV/°C) to counteract diode VF drift-enables ±2% output stability over –40°C to 125°C without external sensors. |
Applications
| Telecom Off-Line Housekeeping Supply | EV Battery Stack Monitoring Supply |
|---|---|
Use Scenario: Isolated 12V/1A auxiliary supply powering MCU, ADC, and CAN transceivers in 400–800V EV battery modules. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating output from high-voltage battery string without optocoupler or secondary feedback. Use Value: Enables compact, AEC-Q100-compliant isolation with <75μA quiescent draw-preserves battery state-of-charge during vehicle sleep mode. |
Use Scenario: Multi-output 5V/3.3V isolated supply for cell voltage monitoring ICs across 96-cell lithium-ion stacks. IC Role / Device Role / Timing Role: Boundary-mode controller delivering tightly regulated outputs via single transformer with tertiary windings. Use Value: Achieves ±1% load regulation across 16V–560V input range-supports accurate cell balancing even during deep discharge or regen events. |
| Industrial Inverter Gate Drive Supply | Medical Isolated Auxiliary Power |
Use Scenario: 15V/2A isolated supply powering IGBT/SiC gate drivers in motor drives with 600V DC bus. IC Role / Device Role / Timing Role: High-voltage flyback controller implementing fast transient response (<100μs) for gate drive sequencing. Use Value: Delivers 4A peak current at 560V input with programmable soft-start-prevents inrush-induced bus droop during system startup. |
Use Scenario: 24V/500mA isolated supply for patient-connected diagnostic equipment requiring reinforced insulation per IEC 60601-1. IC Role / Device Role / Timing Role: Safety-certifiable flyback controller meeting creepage requirements via 20(15)-lead TSSOP package. Use Value: Supports 8mm creepage distance with no optocoupler-reduces risk of isolation barrier failure in life-critical applications. |
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 | Fixed-frequency DCM controller; requires optocoupler for regulation; max VIN = 450V; no integrated temperature compensation. | Lower-cost solution for non-automotive industrial supplies where opto drift is acceptable and input <450V. | Choose UCC28740DR only if optocoupler-based design is preferred and temperature stability <±5% is sufficient. |
| MAX17690ATP+T | 500V max VIN; includes integrated 600V MOSFET; no tertiary-winding sampling-relies on auxiliary winding feedback with higher error. | Better suited for space-constrained designs needing integrated switch; less accurate regulation than LT8316IF#TRPBF's no-opto method. | Select MAX17690ATP+T when board area is critical and ±3% output accuracy meets system requirements. |
Compared with UCC28740DR and MAX17690ATP+T, the LT8316IF#TRPBF offers superior regulation accuracy (±1% vs ±3–5%), wider input range (560V vs 450V/500V), and true no-opto operation-making it optimal for AEC-Q100 automotive, medical, and high-reliability industrial systems demanding long-term stability.
Availability
LT8316IF#TRPBF is available at Aetrix Electronics and suitable for telecom off-line housekeeping, EV battery stack monitoring, and industrial inverter gate drive applications requiring stable component supply, high-voltage isolation, and AEC-Q100 compliance.
Supply support for LT8316IF#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, and automotive markets.
The LT8316IF#TRPBF belongs to Analog Devices' Power by Linear™ isolated controller product line, designed specifically for high-voltage, no-opto flyback topologies in safety-critical and space-constrained applications.
FAQ
What is the maximum continuous input voltage rating for the LT8316IF#TRPBF?
The LT8316IF#TRPBF has a maximum continuous input voltage rating of 560V at the VIN pins (1, 2, 3), with a 600V absolute maximum for transient conditions. This allows direct interface with rectified 400VAC mains or high-voltage DC bus systems without external pre-regulation stages. The device maintains full functionality-including regulation accuracy and thermal derating-across this entire range when used with appropriate transformer and layout practices.
How does the LT8316IF#TRPBF achieve regulation without an optocoupler?
The LT8316IF#TRPBF achieves opto-isolator–free regulation by sampling the flyback voltage waveform from a dedicated tertiary winding on the transformer. During boundary-mode operation, the DCM pin detects the falling edge of this waveform to trigger a sample-and-hold circuit that captures the FB voltage precisely when secondary current reaches zero-eliminating errors from diode forward voltage and parasitic resistance. This sampled voltage is compared to the internal 1.22V reference to adjust switching frequency and duty cycle.
What is the purpose of the TC pin on the LT8316IF#TRPBF?
The TC pin on the LT8316IF#TRPBF 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. By connecting a resistor from TC to FB, the LT8316IF#TRPBF counteracts diode VF drift-enabling stable output voltage over –40°C to 125°C without external temperature sensors or complex calibration.
Can the LT8316IF#TRPBF support both constant-voltage and constant-current regulation?
Yes, the LT8316IF#TRPBF supports simultaneous constant-voltage (CV) and constant-current (CC) regulation. The FB pin regulates output voltage to 1.22V, while the IREG/SS pin-sourced with a precise 10μA current-sets the CC threshold via an external resistor. When load current exceeds this threshold, the controller transitions from CV to CC mode, making it suitable for LED drivers, battery chargers, and other dual-loop applications without secondary-side sensing.
What package variant does the LT8316IF#TRPBF use, and why is it significant?
The LT8316IF#TRPBF uses a 20(15)-lead plastic TSSOP package (FE grade) with extended creepage distance achieved by omitting three low-voltage pins. This configuration meets reinforced insulation requirements for medical (IEC 60601-1) and automotive (AEC-Q100) applications while maintaining thermal performance via the exposed GND pad. The reduced pin count enhances high-voltage spacing between VIN and signal pins-critical for reliability in 560V systems.
LT8316IF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width), 15 Leads
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT8316IF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8316IF#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 LT8316IF#TRPBF reliable?
The price and inventory of LT8316IF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8316IF#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8316IF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8316IF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8316IF#TRPBF?
LT8316IF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8316IF#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 LT8316IF#TRPBF?
For technical support, including LT8316IF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8316IF#TRPBF requirements.
6.How does Aetrix verify that LT8316IF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8316IF#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 LT8316IF#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8316IF#TRPBF?
All LT8316IF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8316IF#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 LT8316IF#TRPBF part is unused and in its original packaging.
Return procedure for LT8316IF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8316IF#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
