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Analog Devices Inc. LT8316HFE#PBF
- Part No.:
- LT8316HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Datasheet:
-
LT8316HFE#PBF.pdf
- Description:
- 600VIN MICROPOWER, ISOLATED NO-O
- Quantity:
- Payment:
- Shipping:
Inventory:3,994
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Product details
Overview
LT8316HFE#PBF from Analog Devices is a micropower, high-voltage isolated flyback controller with no-opto regulation, quasi-resonant boundary-mode operation, 75μA quiescent current, 16V–560V input range, and AEC-Q100-compliant H-grade (−40°C to +150°C) operation-designed for telecom, EV battery stack, and industrial off-line housekeeping supplies.
For engineers reviewing the LT8316HFE#PBF datasheet, LT8316HFE#PBF pinout, LT8316HFE#PBF application, or LT8316HFE#PBF equivalent, key selection considerations include its depletion-mode startup FET, TC-pin temperature compensation for diode VF, CV/CC dual-loop regulation, and 20(16)-lead TSSOP package with extended creepage for >560V transient isolation.
Technical Context
The LT8316HFE#PBF implements boundary-mode (critical conduction) control using DCM pin dV/dt detection to sample output voltage from a transformer tertiary winding-eliminating opto-isolators. Its internal 1.22V reference and PTAT TC pin (1.22V @ 25°C, +4.1mV/°C) enable precise temperature-compensated regulation of low-voltage outputs.
It integrates a depletion-mode startup FET for INTVCC charging, a 10μA IREG/SS current source for programmable current limit/soft-start, and a GM transconductance amplifier (245–455μS) driving VC to modulate switching frequency (3.5kHz–140kHz) and peak current. Standby Mode (via SMODE) reduces minimum frequency to 220Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 16V to 560V continuous (600V max transient)-supports direct connection to rectified AC mains or high-voltage DC bus without pre-regulation. |
| Quiescent Current | 75μA in Burst Mode-enables ultra-low standby power in always-on isolated supplies. |
| Operating Temp Range | −40°C to +150°C junction-certified for automotive under-hood and industrial high-temp environments. |
| FB Regulation Voltage | 1.22V ±30mV over full temp range-sets output voltage accuracy via RFB1/RFB2 divider on tertiary winding. |
| Switching Frequency | 3.5kHz–140kHz variable boundary mode-self-adjusts to maintain zero-current switching and minimize EMI. |
| Current Sense Threshold | 20mV–110mV programmable via IREG/SS-enables precise constant-current regulation for LED or battery charging. |
| TC Pin Output | 1.22V @ 25°C, +4.1mV/°C-provides PTAT voltage to compensate output diode forward-voltage drift across temperature. |
Pinout & Package
LT8316HFE#PBF is housed in a thermally enhanced 20(16)-lead plastic TSSOP package (FE grade) with exposed pad (Pin 21) soldered to GND for thermal management and high-voltage spacing between VIN pins (1, 2, 3). Creepage distance is extended by removing Pins 4–7 and 11–14 per package variant.
| 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 enables direct HV connection without external bleeder. |
| INTVCC (8) | Internal gate driver bias supply | Regulated 10V LDO output; requires ≥2.2μF ceramic bypass for stable gate drive and loop control. |
| BIAS (9) | Unregulated auxiliary supply input | Derives operating power from transformer tertiary winding-minimizes standby loss vs. resistive startup. |
| DCM (10) | Boundary mode detection input | Samples dV/dt of tertiary winding to trigger sampling at valley for accurate zero-current switching. |
| FB (12) | Feedback input | Sampled voltage regulated to 1.22V; connects to resistor divider from tertiary winding for isolated output sensing. |
| IREG/SS (14) | Current regulation / soft-start | 10μA current source sets CC limit point or soft-start ramp time via external RC network. |
| GATE (19) | N-channel MOSFET gate driver output | 30ns rise / 8ns fall time drives external power switch; supports up to 100W output with proper layout. |
| GND (15,20,21) | Signal and power ground | Pins 15/20 are signal GND; Pin 21 (exposed pad) is thermal GND-must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates optocoupler, TL431, and associated compensation components-reducing BOM cost, size, and aging-related drift. |
| Depletion-mode startup FET | Charges INTVCC capacitor directly from VIN-removes need for external high-voltage startup resistor or auxiliary winding. |
| TC-pin temperature compensation | PTAT voltage (1.22V @ 25°C, +4.1mV/°C) offsets diode VF drift-maintains ±1% output stability over −40°C to +150°C. |
| CV/CC dual-loop regulation | Simultaneously regulates output voltage and current-enables single-controller solutions for LED drivers and battery chargers. |
| Standby Mode (SMODE) | Reduces min. switching frequency to 220Hz-lowers light-load ripple and extends hold-up time in always-on systems. |
Applications
| Telecom Housekeeping Supply | EV Battery Stack Monitor |
|---|---|
Use Scenario: Providing isolated 5V/12V bias to monitoring ICs and CAN transceivers across 400–800V EV battery strings. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output from high-voltage DC bus without optocoupler feedback. Use Value: Enables compact, AEC-Q100-compliant auxiliary supply with <75μA quiescent draw-extending battery monitor uptime and reducing thermal stress. | Use Scenario: Powering isolated gate drivers for SiC MOSFETs in multi-level inverters used in traction motor drives. IC Role / Device Role / Timing Role: High-voltage flyback controller delivering tightly regulated 15V gate drive with fast transient response and CV/CC protection. Use Value: Supports >560V input with boundary-mode ZCS switching-reducing EMI and enabling smaller magnetics than CCM designs. |
| Industrial Off-Line Sensor Hub | Medical Isolated Auxiliary Supply |
Use Scenario: Generating isolated 3.3V/5V for analog front-ends and microcontrollers in factory-floor sensors connected to 240VAC mains. IC Role / Device Role / Timing Role: No-opto flyback controller implementing burst-mode regulation at light loads to meet stringent energy efficiency standards. Use Value: Achieves >85% efficiency across 10mA–4A load range while maintaining <12mV output ripple-meeting IEC 61000-3-2 harmonic limits. | Use Scenario: Delivering isolated 12V/24V to patient-connected diagnostic modules requiring reinforced insulation and low leakage current. IC Role / Device Role / Timing Role: Boundary-mode controller with extended creepage TSSOP package meeting 2×MOPP requirements for medical safety standards. Use Value: Provides certified isolation barrier with <2μA earth leakage-enabling compliance with IEC 60601-1 without external isolation transformers. |
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 |
|---|---|---|---|
| LT3748EMSE#PBF | Requires opto-isolator feedback; no integrated TC compensation; 125°C max junction temp. | Lacks no-opto capability and temperature compensation-requires additional components for precision regulation. | Choose when legacy opto-based design reuse is prioritized over BOM reduction and thermal stability. |
| UCC28911DR | Fixed 70kHz frequency; no boundary-mode dV/dt detection; no TC pin; 125°C max junction temp. | Higher light-load losses due to fixed-frequency operation; less accurate output regulation over temperature. | Choose for cost-sensitive consumer applications where ±5% output tolerance and lower ambient temps suffice. |
Compared with LT3748EMSE#PBF and UCC28911DR, the LT8316HFE#PBF delivers superior thermal stability via TC-pin compensation, eliminates opto-isolator BOM overhead, and maintains tighter output regulation (±1%) across −40°C to +150°C-making it optimal for automotive and industrial high-reliability systems.
Availability
LT8316HFE#PBF is available at Aetrix Electronics and suitable for telecom housekeeping, EV battery monitoring, and industrial off-line sensor hub applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant high-temperature operation.
Supply support for LT8316HFE#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 precision instrumentation, industrial automation, automotive, and communications markets.
The LT8316HFE#PBF belongs to Analog Devices' high-voltage isolated power controller product line, engineered specifically for robust, no-opto flyback conversion in harsh environments-from EV battery stacks to medical isolation barriers.
FAQ
What is the maximum continuous input voltage rating for the LT8316HFE#PBF?
The LT8316HFE#PBF supports a continuous input voltage range of 16V to 560V. Its absolute maximum rating is 600V for transient conditions only. Operation above 560V continuously violates the device's safe operating area and may cause permanent damage or premature failure. Always ensure input filtering and clamping circuits limit sustained voltage to ≤560V.
How does the TC pin on the LT8316HFE#PBF improve output voltage stability?
The TC pin on the LT8316HFE#PBF provides a proportional-to-absolute-temperature (PTAT) voltage (1.22V at 25°C, +4.1mV/°C) that compensates for the negative temperature coefficient of the output diode's forward voltage. By connecting an external resistor from TC to FB, the LT8316HFE#PBF actively corrects VOUT drift-achieving ±1% regulation over −40°C to +150°C without external calibration.
Can the LT8316HFE#PBF operate without an external MOSFET?
No, the LT8316HFE#PBF does not integrate a power switch. It is a controller IC only and requires an external N-channel MOSFET connected to the GATE pin. The internal circuitry drives the gate of this external switch; selecting a MOSFET with appropriate voltage rating (≥600V), RDS(on), and Qg is essential for achieving the rated 100W output and thermal performance.
What is the purpose of the DCM pin on the LT8316HFE#PBF?
The DCM pin on the LT8316HFE#PBF detects the dV/dt of the transformer's tertiary winding to identify the resonant valley-triggering the sample-and-hold circuit for precise output voltage sampling at zero secondary current. This enables true boundary-mode operation, improving load regulation and eliminating subharmonic oscillation without needing extra timing components.
Is the LT8316HFE#PBF pin-compatible with other LT8316 variants like LT8316EFE#PBF?
Yes, the LT8316HFE#PBF shares identical pinout, package footprint (20(16)-lead TSSOP), and electrical interface with LT8316EFE#PBF and LT8316IFE#PBF. The sole difference is the guaranteed operating junction temperature range: LT8316HFE#PBF is rated for −40°C to +150°C, while E/I grades are rated to +125°C. No PCB changes are required for upgrade.
LT8316HFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Packaging:
- Tube
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8316HFE#PBF FAQ
1.How can I place an order for LT8316HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8316HFE#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 LT8316HFE#PBF reliable?
The price and inventory of LT8316HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8316HFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8316HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8316HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8316HFE#PBF?
LT8316HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8316HFE#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 LT8316HFE#PBF?
For technical support, including LT8316HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8316HFE#PBF requirements.
6.How does Aetrix verify that LT8316HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8316HFE#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 LT8316HFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8316HFE#PBF?
All LT8316HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8316HFE#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 LT8316HFE#PBF part is unused and in its original packaging.
Return procedure for LT8316HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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