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Analog Devices Inc. LT8310IFE#PBF
- Part No.:
- LT8310IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Datasheet:
-
LT8310IFE#PBF.pdf
- Description:
- IC MOSFET DRIVER SYNC 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:326
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Product details
Overview
LT8310IFE#PBF from Analog Devices (formerly Linear Technology) is a 100V-input resonant-reset forward converter controller with duty-mode and current-mode operation, driving a low-side N-channel MOSFET via a regulated 10V gate supply (INTVCC), supporting isolated/nonisolated DC/DC designs with ±8% output voltage load regulation and programmable 100–500kHz switching frequency. It enables transformer-based 48V telecom power supplies and industrial isolated converters.
For engineers reviewing the LT8310IFE#PBF datasheet, LT8310IFE#PBF pinout, LT8310IFE#PBF application, or LT8310IFE#PBF equivalent, key selection criteria include its 6–100V input range, 78% max duty cycle for core reset, 20µA precision RDVIN current sink for duty-mode VOUT programming, synchronous secondary-side control via SOUT, and UVLO/OVLO protection with hysteresis.
Technical Context
The LT8310IFE#PBF implements a patent-pending duty-mode control loop where duty cycle D ∝ 1/VIN, enabling stable isolated output without optocoupler feedback by enforcing volt-second accuracy across input voltage variation. Its RDVIN pin sinks a precise 20.0µA (typ) to set VSET = INTVCC − VRDVIN, directly determining output voltage via transformer turns ratio per VOUT = 12·VSET/(NP/NS).
Current-mode operation activates when FBX voltage exceeds ±0.3V (positive/negative polarity), engaging transconductance error amplifier (250µA/V gain) and peak-current limiting at 125mV on SENSE. Protection includes hiccup-mode overcurrent, programmable soft-start (50µA charge/6mA discharge), and thermal shutdown at 165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide-range industrial and telecom inputs including 48V systems with headroom for transients. |
| Switching Frequency | 100kHz to 500kHz - user-programmable via RT resistor; enables optimization of efficiency, magnetics size, and EMI performance. |
| Max Duty Cycle | 78% (typ) - ensures sufficient off-time for resonant reset of forward converter transformer flux each cycle. |
| RDRVIN Sink Current | 20.0µA (typ) - precise internal current source enabling accurate output voltage setting in duty-mode applications without feedback. |
| SENSE Threshold | 125mV (typ) - fixed overcurrent detection level for primary-side switch current sensing with fast fault response. |
| INTVCC Regulation | 10.0V ±0.4V - internally regulated gate drive supply capable of sourcing 33mA, reducing external bias requirements. |
| Soft-Start Current | 50µA (normal), 6mA (fault discharge) - controls ramp rate and enables hiccup-mode recovery during overcurrent events. |
Pinout & Package
LT8310IFE#PBF is housed in a 20-lead plastic TSSOP (FE package) with HV pin spacing, featuring an exposed GND pad (Pin 21) that must be soldered to the PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UVLO (1) | Undervoltage lockout input | Resistive divider sets system start-up threshold (1.22V ref); 5.7µA hysteresis current enables programmable hysteresis. |
| OVLO (3) | Overvoltage lockout input | Resistive divider sets shutdown threshold (1.25V ref); rising-edge latch prevents restart until reset. |
| DFILT (5) | Duty loop filter node | Capacitor to GND sets loop pole; critical for stability and load-step ringing suppression in duty-mode control. |
| RT (6) | Oscillator timing resistor | Resistor to GND programs switching frequency (100–500kHz); requires low-stray-capacitance layout. |
| SYNC (7) | External clock input | Accepts 260–400kHz external clock; falling edge triggers minimum off-time; enables system-level synchronization. |
| SS (8) | Soft-start control | Capacitor to GND sets startup time; sources 50µA normally, sinks 6mA during faults for hiccup-mode recovery. |
| VC (9) | Error amplifier output | Compensation node for current-mode loop; connect RC network to GND; leave open in duty-mode-only configurations. |
| FBX (10) | Feedback & mode select | 1.6V (pos) / –0.8V (neg) reference; <±0.2V enables duty mode; >±0.3V engages current-mode regulation. |
| SOUT (11) | Synchronous rectifier driver | Non-overlapping complementary output to GATE; leads GATE turn-on by 240ns (typ), trails turn-off by 12ns (typ). |
| SENSE (13) | Primary switch current sense | High-side Kelvin connection to MOSFET source; 125mV threshold triggers immediate overcurrent shutdown. |
| GATE (14) | Low-side MOSFET driver | 10V swing (INTVCC–0.05V to 0.05V); 30ns rise/27ns fall into 3.3nF; actively pulled low during shutdown. |
| INTVCC (15) | Regulated 10V supply | Internally generated LDO; requires ≥4.7µF bypass; can be externally driven up to 17V to reduce dissipation. |
| RDVIN (16) | Duty-mode set current sink | 20.0µA (typ) sink; connects to INTVCC via RSET to program VOUT in duty-mode applications. |
| VIN (18) | Main power input | 6–100V operation; also senses input for duty-loop scaling; requires 1µF local bypass. |
| GND (21) | Power & signal ground | Exposed pad; serves as current-sense return and primary thermal path; must be soldered to ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Duty-mode regulation without optocoupler | Enables isolated forward converters with single transformer only-reducing BOM count, cost, and footprint vs. traditional feedback schemes. |
| Programmable 100–500kHz switching | Allows trade-off between magnetic size (higher fSW → smaller transformers) and conduction losses (lower fSW → lower MOSFET RMS current). |
| Synchronous secondary-side control (SOUT) | Provides non-overlapping gate drive for secondary-side MOSFETs, improving efficiency by replacing Schottky diodes in high-current outputs. |
| Hiccup-mode overcurrent protection | Shuts down on SENSE >125mV, discharges SS pin at 6mA, then retries after slow wake-up-limiting average power during sustained faults. |
| Transformer flux saturation prevention | Combines 78% max duty cycle limit + duty-mode volt-second accuracy + programmable soft-start to avoid core saturation under all conditions. |
Applications
| 48V Telecom Isolated Power Supply | Industrial Isolated DC/DC Converter |
|---|---|
Use Scenario: Generating isolated 12V/6.5A output from 36–72V telecom rectified bus with tight load regulation and transient immunity. IC Role / Device Role / Timing Role: Forward converter controller managing primary-side MOSFET switching, duty-cycle regulation, and synchronous rectification timing via SOUT. Use Value: Achieves ±8% VOUT load regulation without optocoupler, reduces component count by eliminating secondary-side feedback circuitry, and maintains core reset margin across full input range. | Use Scenario: Providing isolated 5V/3A auxiliary power in factory automation PLCs with 24–100V unregulated input and harsh EMI environment. IC Role / Device Role / Timing Role: Resonant-reset forward controller implementing duty-mode regulation with programmable UVLO/OVLO thresholds and SYNC input for system-level clock alignment. Use Value: Enables robust operation across wide input range while meeting IEC 61000-4-4/5 immunity requirements via controlled soft-start and hiccup-mode fault handling. |
| Automotive 48V Mild Hybrid DC/DC | Nonisolated Buck-Derived Converter |
Use Scenario: Converting 48V battery rail to 12V for legacy vehicle subsystems in mild hybrid architectures requiring high reliability and thermal resilience. IC Role / Device Role / Timing Role: High-voltage forward controller operating at 150°C junction temperature (H-grade variant), managing transformer reset timing and synchronous rectification sequencing. Use Value: Supports extended temperature operation (–40°C to 150°C) with integrated thermal shutdown and low shutdown current (<1µA), extending battery life during sleep modes. | Use Scenario: Generating nonisolated 3.3V/5A output from 12–48V industrial input using direct-wired FBX feedback for highest accuracy. IC Role / Device Role / Timing Role: Dual-mode controller operating in current-mode with transconductance error amplifier (250µA/V) and fast 125mV overcurrent detection on SENSE. Use Value: Delivers <1% output voltage accuracy via FBX feedback while retaining duty-mode clamp for transient flux protection-ensuring safety during load surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar forward converter controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2891DR | Fixed 275kHz frequency; no programmable frequency; no SOUT pin; requires external VDD bias; no duty-mode operation. | Designed for simpler flyback or forward topologies without synchronous rectification or transformer-less isolation. | Select UCC2891DR only for cost-sensitive, fixed-frequency flyback designs where synchronous rectification and duty-mode regulation are unnecessary. |
| LM5039MTX/NOPB | Supports active clamp forward topology; 50–1000kHz programmable frequency; no integrated 10V LDO; requires external gate driver bias. | Optimized for high-efficiency active clamp forward converters with bidirectional energy recovery, not resonant-reset variants. | Choose LM5039MTX/NOPB when designing active clamp forward converters needing higher efficiency at light loads and wider frequency range than LT8310IFE#PBF supports. |
Compared with UCC2891DR and LM5039MTX/NOPB, the LT8310IFE#PBF uniquely integrates duty-mode regulation without feedback, a 10V LDO gate supply, and SOUT-driven synchronous rectification-making it optimal for compact, isolated forward converters where transformer-only isolation and hiccup-mode fault tolerance are critical.
Availability
LT8310IFE#PBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, industrial isolated DC/DC converters, and automotive 48V mild hybrid systems requiring stable component supply, long-term lifecycle support, and guaranteed −40°C to 125°C operation.
Supply support for LT8310IFE#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and aerospace markets.
The LT8310IFE#PBF belongs to Linear's high-voltage DC/DC controller product line, designed specifically for isolated forward converter topologies requiring robust input voltage range, transformer flux control, and flexible feedback architecture.
FAQ
What is the maximum input voltage rating for the LT8310IFE#PBF?
The LT8310IFE#PBF has an absolute maximum input voltage rating of 100V on the VIN pin, with operational functionality guaranteed from 6V to 100V. This makes the LT8310IFE#PBF suitable for demanding applications such as 48V telecom systems and industrial 24–100V inputs where transient overvoltage protection is essential.
How does the LT8310IFE#PBF achieve regulation without an optocoupler?
The LT8310IFE#PBF achieves optocoupler-free regulation through its duty-mode control architecture: the RDVIN pin sinks a precise 20.0µA current, establishing a VSET voltage that-combined with the transformer turns ratio-sets output voltage via VOUT = 12·VSET/(NP/NS). This volt-second accuracy eliminates need for secondary-side feedback in isolated forward converters.
Can the LT8310IFE#PBF drive synchronous rectifiers on the secondary side?
Yes, the LT8310IFE#PBF provides dedicated SOUT pin output-a non-overlapping, complementary signal to GATE-with 240ns lead time before GATE turn-on and 12ns lag after GATE turn-off. This timing enables reliable synchronous rectification control in high-efficiency forward converter designs, improving conversion efficiency over diode-based solutions.
What protection features are built into the LT8310IFE#PBF?
The LT8310IFE#PBF integrates multiple protection features: UVLO/OVLO with programmable hysteresis, 125mV overcurrent detection on SENSE with hiccup-mode shutdown, thermal shutdown at 165°C, INTVCC undervoltage/overvoltage lockout, and programmable soft-start with foldback. These ensure robust operation across industrial and automotive environments.
Is the LT8310IFE#PBF pin-compatible with other grades like LT8310HFE#PBF?
Yes, the LT8310IFE#PBF shares identical pinout, package (20-lead TSSOP), and electrical interface with LT8310HFE#PBF and LT8310EFE#PBF. The only difference is operating temperature grade: LT8310IFE#PBF is rated for −40°C to 125°C junction temperature, while LT8310HFE#PBF extends to 150°C. No PCB changes are required for grade substitution within thermal limits.
LT8310IFE#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
- Programmable:
- Not Verified
- Applications:
- Forward Converter Controller
- Voltage - Input:
- -
- Voltage - Supply:
- 6V ~ 100V
- Current - Supply:
- 3.8 mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8310IFE#PBF FAQ
1.How can I place an order for LT8310IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8310IFE#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 LT8310IFE#PBF reliable?
The price and inventory of LT8310IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8310IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8310IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8310IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8310IFE#PBF?
LT8310IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8310IFE#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 LT8310IFE#PBF?
For technical support, including LT8310IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8310IFE#PBF requirements.
6.How does Aetrix verify that LT8310IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8310IFE#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 LT8310IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8310IFE#PBF?
All LT8310IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8310IFE#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 LT8310IFE#PBF part is unused and in its original packaging.
Return procedure for LT8310IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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