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Analog Devices Inc. LT8316EFE#PBF
- Part No.:
- LT8316EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Datasheet:
-
LT8316EFE#PBF.pdf
- Description:
- 600VIN MICROPOWER, ISOLATED NO-O
- Quantity:
- Payment:
- Shipping:
Inventory:704
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Product details
Overview
LT8316EFE#PBF 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, features quasi-resonant boundary-mode control, and achieves 75μA quiescent current in Burst Mode. It is used in isolated housekeeping supplies for industrial inverters and EV battery stacks.
For engineers reviewing the LT8316EFE#PBF datasheet, LT8316EFE#PBF pinout, LT8316EFE#PBF application, or LT8316EFE#PBF equivalent, key selection considerations include its 560V VIN rating, no-opto isolation architecture, programmable constant-current/constant-voltage regulation, TSSOP-20(16) package with high-voltage creepage, and AEC-Q100-compliant variants for automotive gate drive supplies.
Technical Context
The LT8316EFE#PBF 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 1.22V reference and PTAT TC pin (1.22V @ 25°C, +4.1mV/°C) enable temperature-compensated diode-drop correction for stable CV regulation across –40°C to 125°C.
It integrates a depletion-mode startup FET to charge INTVCC from VIN without external bleeder resistors, then switches to BIAS-derived power during operation. The IREG/SS pin sources 10μA to set current-limit threshold, while VC provides transconductance-amplifier-based loop compensation with GM = 350μS typical.
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 supplies such as inverter auxiliary rails. |
| FB Regulation Voltage | 1.22V ±30mV over temperature; defines precision output voltage setpoint via resistor divider on tertiary winding. |
| Switching Frequency Range | 3.5kHz–140kHz; variable-frequency boundary mode improves light-load efficiency and eliminates subharmonic oscillation. |
| Current Limit Threshold | VSENSE = 90–110mV; sets peak switch current via external sense resistor, supporting up to 4A output at high input voltages. |
| TC Pin Output | 1.22V @ 25°C, +4.1mV/°C; provides PTAT voltage to compensate output diode forward-voltage drift in low-VOUT designs. |
| 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#PBF uses a thermally enhanced 20(16)-lead plastic TSSOP package (FE grade) with high-voltage spacing: pins 1–3 are VIN (560V drain of internal startup FET), exposed pad (Pin 21) is GND and must be soldered to PCB ground plane for thermal performance. Absolute max VIN = 600V transient, 560V continuous.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1, 2, 3) | Drain of internal depletion-mode startup FET | Accepts 16–560V input; powers INTVCC capacitor at startup, then idle during normal operation. |
| INTVCC (8) | Internal gate driver bias supply | Regulated 10V LDO output; requires ≥2.2μF ceramic bypass capacitor for stable gate drive. |
| BIAS (9) | Unregulated IC power input | Derives operating power from transformer tertiary winding; bypass with ≥100nF capacitor. |
| DCM (10) | Boundary mode detection input | Samples dV/dt of tertiary winding to detect valley for zero-current sampling and quasi-resonant switching. |
| TC (11) | Temperature compensation reference | Provides 1.22V @ 25°C (+4.1mV/°C) to offset output diode VF drift in CV regulation. |
| FB (12) | Isolated output voltage feedback | Samples tertiary-winding flyback pulse; regulated to 1.22V to achieve precise output voltage without optocoupler. |
| VC (13) | Loop compensation node | GM amplifier output; connects to R-C network to stabilize voltage/current control loop dynamics. |
| IREG/SS (14) | Current limit and soft-start programming | 10μA current source; resistor to GND sets CC threshold; capacitor enables controlled startup ramp. |
| SMODE (16) | Standby mode enable | Tie to INTVCC to reduce min frequency to 220Hz for ultra-low-power hold-up; tie to GND for normal operation. |
| EN/UVLO (17) | Enable and undervoltage lockout | 1.22V threshold with 65mV hysteresis; supports resistor-divider UVLO or logic-level enable control. |
| SENSE (18) | Primary-side current sensing | Monitors MOSFET source voltage; 90–110mV threshold enables accurate peak-current limiting and overload protection. |
| GATE (19) | N-channel MOSFET gate driver | 30ns rise / 8ns fall time into 3.3nF load; drives external high-voltage power switch directly. |
| GND (15, 20) | Signal and power ground reference | Low-impedance return path for control circuitry; must be connected to exposed pad (Pin 21) for thermal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates optocoupler, TL431, and associated bias components-reducing BOM cost, board area, and aging-related drift in telecom/industrial supplies. |
| Quasi-resonant boundary-mode control | Enables zero-current switching, improving efficiency >90% at full load and reducing EMI vs. fixed-frequency CCM flyback. |
| Programmable CV/CC regulation | Simultaneous constant-voltage (via FB) and constant-current (via IREG/SS) loops support LED drivers and battery charging applications. |
| Depletion-mode startup FET | Charges INTVCC from VIN without external resistor or auxiliary winding-simplifying high-input-voltage startup design. |
| Temperature-compensated output | TC pin + external resistor corrects diode VF drift, maintaining ±1% output stability over –40°C to 125°C in 5–24V supplies. |
Applications
| Industrial Inverter Gate Drive Supply | EV Battery Stack Housekeeping Power |
|---|---|
|
Use Scenario: Isolated 12V/3A auxiliary supply powering IGBT/SiC gate drivers and level-shifters in multi-level motor drives. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output from 300–800V DC-link using tertiary-winding feedback. Use Value: Enables compact, reliable, and maintenance-free gate drive power without optocoupler degradation-critical for 15+ year industrial system lifetimes. |
Use Scenario: Off-line 15V/2A supply powering monitoring ICs and communication interfaces across 100-cell EV battery packs (up to 450V). IC Role / Device Role / Timing Role: High-voltage flyback controller delivering isolated bias from battery string midpoint, with UVLO tailored to pack voltage range. Use Value: Supports functional safety requirements by eliminating optocoupler failure modes and providing AEC-Q100-compliant variants for ASIL-B systems. |
| Medical Imaging System Auxiliary Rail | Telecom Remote Radio Unit (RRU) Power |
|
Use Scenario: 5V/1A isolated supply for FPGA configuration, ADC reference, and sensor interface in portable X-ray generators. IC Role / Device Role / Timing Role: Low-noise, low-ripple flyback controller operating in Burst Mode at light loads to minimize standby power in battery-backed systems. Use Value: Achieves <75μA quiescent current and <1% output ripple-meeting stringent EMC and leakage current limits for Class II medical devices. |
Use Scenario: 24V/1.5A isolated supply powering RF PA bias and digital control in outdoor macrocell RRUs powered from -48V DC plant. IC Role / Device Role / Timing Role: High-efficiency flyback controller accepting wide-input (-36V to -72V rectified) via external HV front-end, regulating via tertiary winding. Use Value: Delivers >92% peak efficiency and withstands 600V transients-ensuring uptime in harsh telecom environments with minimal heatsinking. |
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 = 65V (needs external HV front-end). | Targeted at lower-input AC/DC adapters; lacks integrated HV startup and no-opto capability. | Select when cost sensitivity outweighs integration benefits and optocoupler use is acceptable. |
| MAX17690ATP+ | 500V max VIN; no-opto regulation; but only supports CV mode (no CC loop); TQFN-20 package (no HV creepage pins). | Designed for industrial SMPS where constant-current capability is unnecessary. | Choose for space-constrained designs needing similar HV isolation but without LED/battery charging requirements. |
Compared with UCC28740DR and MAX17690ATP+, the LT8316EFE#PBF uniquely combines 560V native input, no-opto regulation, programmable CV/CC, and extended creepage in a single TSSOP package-making it optimal for high-reliability, high-voltage isolated supplies where component count, long-term stability, and safety certification matter.
Availability
LT8316EFE#PBF is available at Aetrix Electronics and suitable for industrial inverter gate drive supplies, EV battery stack monitoring systems, and telecom remote radio unit power requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant alternatives.
Supply support for LT8316EFE#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 power management semiconductors, serving industrial, automotive, communications, and healthcare markets with precision timing, signal conditioning, and isolated power solutions.
The LT8316EFE#PBF belongs to Analog Devices' LT® µModule and isolated controller product line, designed specifically for high-voltage, no-opto isolated flyback power conversion in safety-critical and space-constrained applications.
FAQ
What is the maximum continuous input voltage rating for the LT8316EFE#PBF?
The LT8316EFE#PBF has a maximum continuous input voltage rating of 560V on the VIN pins (1, 2, 3), with an absolute maximum transient rating of 600V. This allows direct connection to rectified 400VAC mains or high-voltage DC bus systems without external pre-regulation stages. Operation above 560V continuous violates specifications and risks permanent damage per Absolute Maximum Ratings.
How does the LT8316EFE#PBF achieve regulation without an optocoupler?
The LT8316EFE#PBF samples the flyback pulse voltage from a dedicated tertiary winding on the transformer, synchronizing measurement to the point where secondary current approaches zero. This sampled voltage is compared to the internal 1.22V reference at the FB pin, enabling precise output voltage regulation without optical isolation. The method eliminates optocoupler aging, nonlinearity, and dynamic response limitations inherent in traditional isolated supplies.
Can the LT8316EFE#PBF support both constant-voltage and constant-current output modes?
Yes, the LT8316EFE#PBF supports dual-loop regulation: constant-voltage (CV) via the FB pin and constant-current (CC) via the IREG/SS pin. When output current reaches the threshold set by the IREG/SS resistor, the controller transitions from CV to CC mode-enabling applications like LED drivers and battery chargers. The CC threshold is programmable with a resistor to GND, sourcing 10μA from the IREG/SS pin.
What is the purpose of the TC pin on the LT8316EFE#PBF, and how is it used?
The TC pin on the LT8316EFE#PBF 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. By connecting an external resistor from TC to FB, the controller counteracts diode VF drift-maintaining tight output voltage stability (±1%) across –40°C to 125°C, especially critical in low-output-voltage (<24V) designs.
Does the LT8316EFE#PBF require an external startup circuit?
No, the LT8316EFE#PBF integrates a depletion-mode startup FET connected to the VIN pins, which automatically charges the INTVCC capacitor at power-up. This eliminates the need for external bleeder resistors, startup windings, or auxiliary supplies. Once INTVCC reaches ~12V, the depletion FET turns off and the IC switches to BIAS-derived power from the transformer's tertiary winding-minimizing standby losses.
LT8316EFE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8316EFE#PBF FAQ
1.How can I place an order for LT8316EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8316EFE#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 LT8316EFE#PBF reliable?
The price and inventory of LT8316EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8316EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8316EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8316EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8316EFE#PBF?
LT8316EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8316EFE#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 LT8316EFE#PBF?
For technical support, including LT8316EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8316EFE#PBF requirements.
6.How does Aetrix verify that LT8316EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8316EFE#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 LT8316EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8316EFE#PBF?
All LT8316EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8316EFE#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 LT8316EFE#PBF part is unused and in its original packaging.
Return procedure for LT8316EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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