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Analog Devices Inc. LT8310MPFE#PBF
- Part No.:
- LT8310MPFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Datasheet:
-
LT8310MPFE#PBF.pdf
- Description:
- IC MOSFET DRIVER SYNC 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,929
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Product details
Overview
LT8310MPFE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage resonant-reset forward converter controller driving a low-side N-channel MOSFET with internally regulated 10V gate drive. It delivers duty-mode control for isolated output regulation without optocoupler feedback, supports 6V–100V input range, programmable 100kHz–500kHz switching frequency, and operates across –55°C to +150°C junction temperature. It enables 78W isolated DC/DC conversion in industrial power supplies.
For engineers reviewing the LT8310MPFE#PBF datasheet, LT8310MPFE#PBF pinout, LT8310MPFE#PBF application, or LT8310MPFE#PBF equivalent, key selection criteria include its duty-mode vs current-mode dual-control architecture, RDVIN-based output voltage programming, synchronous secondary-side timing via SOUT, UVLO/OVLO programmability, and FE20 TSSOP package with HV pin spacing for 100V operation.
Technical Context
The LT8310MPFE#PBF implements a patent-pending duty-mode control loop where duty cycle D ∝ 1/VIN, enabling stable isolated output without feedback-achieved by integrating VIN-sensed current into the DFILT pin capacitor to generate a volt-second-accurate ramp. Its dual-mode operation allows seamless transition between duty mode (FBX grounded) and current mode (FBX connected), with the duty loop acting as a programmable relative maximum duty clamp during transients to prevent transformer saturation.
Core protection logic includes programmable UVLO (1.22V threshold, 40mV hysteresis) and OVLO (1.25V threshold, –33mV hysteresis) via external resistive dividers, soft-start–controlled frequency/duty foldback, hiccup-mode overcurrent shutdown triggered at 125mV SENSE threshold, and thermal shutdown at ~165°C. The GATE driver delivers 10V swing with 30ns rise/27ns fall into 3.3nF, while SOUT provides non-overlapping complementary timing with 240ns lead and 12ns lag relative to GATE.
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 margin. |
| Switching Frequency | 100kHz to 500kHz - user-programmable via RT resistor; enables optimization of magnetics size, efficiency, and EMI. |
| Max Duty Cycle | 78% typical - ensures sufficient off-time for resonant reset of forward converter transformer core. |
| SENSE Threshold | 125mV ±10mV - precise overcurrent detection for fast shutdown; Kelvin-sense compatible for accuracy. |
| INTVCC Regulator | 10.0V ±0.4V @ 0–20mA - powers gate driver and internal circuitry; dropout ≤600mV at 20mA. |
| Operating Temp | –55°C to +150°C - qualified for military and extended-temperature industrial applications (MP grade). |
| UVLO Threshold | 1.220V ±24mV with 40mV hysteresis - enables robust start-up sequencing and brownout immunity. |
Pinout & Package
LT8310MPFE#PBF is housed in a 20-lead plastic TSSOP (FE20) package with HV pin spacing, featuring an exposed thermal pad (Pin 21) that must be soldered to the ground plane for thermal and electrical integrity. Pin 20 (NC) connects to VIN; Pin 12 (NC) connects to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UVLO (1) | System undervoltage lockout input | Resistive divider sets falling UVLO threshold at 1.22V; 5.7µA hysteresis current enables programmable hysteresis. |
| OVLO (3) | System overvoltage lockout input | Resistive divider sets rising OVLO threshold at 1.25V; fault latch forces shutdown on overvoltage event. |
| DFILT (5) | Duty cycle loop filter node | Capacitor to GND sets loop pole; integrates VIN-proportional current for duty-mode stability and load-step response. |
| RT (6) | Oscillator timing resistor input | Resistor to GND programs switching frequency (100–500kHz); requires low-stray-capacitance layout. |
| SYNC (7) | External clock synchronization input | Accepts external clock ≥260kHz; falling edge triggers minimum off-time; requires ≥250ns high/low pulse width. |
| SS (8) | Soft-start timing and fault recovery | Capacitor to GND controls startup ramp; sources 50µA (normal), sinks 6mA (fault), clamps at 3V. |
| VC (9) | Error amplifier output | Transconductance output (250µA/V) for loop compensation; left open in duty-mode-only designs. |
| FBX (10) | Feedback input / mode select | 1.6V reference for positive VOUT, –0.8V for negative; –0.2V to 0.3V range selects duty mode; >7.5% overvoltage terminates cycle. |
| SOUT (11) | Synchronous rectifier driver output | Non-overlapping complement to GATE; 240ns lead on turn-on, 12ns lag on turn-off; drives pulse transformer for FCM. |
| SENSE (13) | Low-side switch current sense | Positive input to overcurrent comparator; Kelvin-connected to MOSFET source; trips at 125mV. |
| GATE (14) | N-channel MOSFET gate driver | 10V swing (INTVCC – 0.05V high), 30ns rise/27ns fall into 3.3nF; actively pulled low in shutdown. |
| INTVCC (15) | Internally regulated 10V supply | Bypass with ≥4.7µF; can be externally driven up to 17V to reduce dissipation or support higher gate drive. |
| RDVIN (16) | Duty-mode setpoint input | Sinks precise 20µA nominal; RSET between INTVCC and RDVIN programs VOUT = 12·VSET/(NP/NS). |
| VIN (18) | Main supply and voltage sense input | 6V–100V operation; also senses input for duty-loop accuracy; bypass with 1µF ceramic. |
| GND (21) | Power and current-sense reference | Exposed pad must be soldered to PCB ground plane; serves as Kelvin return for SENSE resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode control architecture | Seamlessly switches between duty mode (no opto required) and current mode (opto or direct feedback), with duty loop enforcing programmable max duty as flux-saturation guardrail. |
| Programmable UVLO/OVLO | Independent 1.22V UVLO and 1.25V OVLO thresholds with user-defined hysteresis via external resistors-enables custom input voltage windowing. |
| Synchronous secondary timing | SOUT pin delivers precisely timed, non-overlapping signal to drive synchronous rectifiers or pulse transformers-improves efficiency and enables forced continuous conduction mode. |
| Transformer-safe soft-start | SS pin controls startup ramp while folding back both switching frequency and duty cycle-prevents flux walk and limits inrush current during power-up. |
| High-accuracy duty-mode regulation | RDVIN pin sinks 20.0µA ±0.3µA; combined with precise 12.00V/V duty gain and 1.22V UVLO reference, enables <±1% output voltage accuracy without feedback. |
| Military-grade thermal rating | –55°C to +150°C operating junction temperature (MP grade) with integrated thermal shutdown at ~165°C-qualified for harsh-environment deployment. |
Applications
| 48V Telecom Isolated Power | Industrial 24/48V DC/DC Conversion |
|---|---|
Use Scenario: Generating isolated 12V/6.5A output from 36–72V telecom rectified bus in NEBS-compliant equipment. IC Role / Device Role / Timing Role: Forward converter controller managing primary-side MOSFET switching, resonant reset timing, and synchronous rectifier coordination via SOUT. Use Value: Eliminates optocoupler and secondary-side error amp, reducing BOM count and improving long-term reliability while maintaining ±8% VOUT load regulation. | Use Scenario: Providing isolated 5V/3A auxiliary power for PLC I/O modules operating from unregulated 24V factory bus. IC Role / Device Role / Timing Role: Duty-mode controller regulating output using transformer turns ratio and RDVIN-set VSET, with UVLO/OVLO protecting against bus transients. Use Value: Achieves stable regulation across wide input range without feedback components-reducing design complexity and qualification effort for industrial certifications. |
| Military Vehicle Power Systems | High-Voltage Battery Monitoring Supplies |
Use Scenario: Generating isolated 3.3V/2A bias supply for ADCs and isolators in 28V/270V aircraft power distribution units. IC Role / Device Role / Timing Role: MP-grade controller delivering full-spec operation from –55°C cold soak to +150°C under-hood conditions, with hiccup-mode OCP for fault containment. Use Value: Meets MIL-STD-810H thermal cycling and MIL-STD-704E input surge requirements without derating or external thermal management. | Use Scenario: Powering isolated CAN transceivers and voltage monitors in EV battery packs with 400–800V nominal bus. IC Role / Device Role / Timing Role: High-input-voltage forward controller accepting 100V-rated VIN pin directly from auxiliary 12V rail derived from battery tap. Use Value: Enables direct use of high-side auxiliary rail without pre-regulation-reducing component count and improving system efficiency in space-constrained battery modules. |
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 200kHz frequency; no programmable UVLO/OVLO; no SOUT pin; requires external VREF for duty-mode setup. | Limited to fixed-frequency designs; lacks synchronous rectifier timing; less flexible for wide-input or ruggedized systems. | Choose UCC2891DR only when cost sensitivity outweighs need for frequency tuning, hiccup OCP, or SOUT-driven synchronous rectification. |
| MAX5072AESA+ | Current-mode only; 75V max input; no duty-mode capability; integrated 5V LDO instead of 10V gate drive. | Cannot implement optocoupler-free isolated regulation; unsuitable for >75V inputs or high-side N-MOSFET gate drive. | Select MAX5072AESA+ only for lower-voltage, feedback-dependent designs where 10V gate drive and duty-mode operation are unnecessary. |
Compared with UCC2891DR and MAX5072AESA+, the LT8310MPFE#PBF uniquely combines programmable frequency, dual-mode control, 100V input tolerance, and SOUT timing-making it the only option capable of optocoupler-free 78W isolated conversion across –55°C to +150°C with transformer saturation protection.
Availability
LT8310MPFE#PBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, industrial 24/48V DC/DC converters, and military vehicle power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8310MPFE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT8310MPFE#PBF belongs to ADI's Power by Linear™ forward converter controller family, designed specifically for high-reliability isolated DC/DC conversion in aerospace, defense, and industrial applications where optocoupler elimination, wide input range, and extreme temperature operation are critical.
FAQ
What is the maximum input voltage rating for the LT8310MPFE#PBF?
The LT8310MPFE#PBF has an absolute maximum input voltage rating of 100V on the VIN pin, and the UVLO and OVLO pins are rated to withstand up to 100V and 20V respectively. This enables direct interface with 48V telecom systems, 24V/270V military buses, and auxiliary rails derived from high-voltage battery stacks-without external clamping or pre-regulation.
How does the LT8310MPFE#PBF achieve regulation without an optocoupler?
The LT8310MPFE#PBF uses duty-mode control: its internal circuitry forces a duty cycle inversely proportional to input voltage (D ∝ 1/VIN) so that VOUT = D × VIN × (NS/NP) remains constant. The RDVIN pin sinks a precise 20µA current, allowing output voltage to be set via RSET = (VOUT × NP/NS) / 12V × 1/20µA-enabling accurate regulation without secondary-side feedback components.
What is the purpose of the SOUT pin on the LT8310MPFE#PBF?
The SOUT pin on the LT8310MPFE#PBF provides a non-overlapping, complementary timing signal to GATE-leading GATE turn-on by 240ns and trailing GATE turn-off by 12ns. It is designed to drive pulse transformers or gate drivers for synchronous rectifiers on the secondary side, improving efficiency and enabling forced continuous conduction mode (FCM) in forward converter topologies.
Can the LT8310MPFE#PBF operate in both duty mode and current mode simultaneously?
No-the LT8310MPFE#PBF operates in either duty mode or current mode, selected automatically based on FBX pin voltage. When –0.2V < VFBX < 0.3V, duty mode is active; otherwise, current mode takes control. In current mode, the duty loop remains active as a programmable relative maximum duty clamp to protect against transformer saturation during transients-ensuring safe dual-role operation without conflict.
What thermal specifications define the "MP" grade in LT8310MPFE#PBF?
The "MP" grade in LT8310MPFE#PBF denotes a guaranteed operating junction temperature range of –55°C to +150°C, with thermal shutdown activated at approximately 165°C. It is qualified per MIL-STD-883 methods for extended temperature reliability, includes enhanced process controls for parameter stability across extremes, and requires the exposed pad (Pin 21) to be soldered to the PCB ground plane for effective thermal dissipation.
LT8310MPFE#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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8310MPFE#PBF FAQ
1.How can I place an order for LT8310MPFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8310MPFE#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 LT8310MPFE#PBF reliable?
The price and inventory of LT8310MPFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8310MPFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8310MPFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8310MPFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8310MPFE#PBF?
LT8310MPFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8310MPFE#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 LT8310MPFE#PBF?
For technical support, including LT8310MPFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8310MPFE#PBF requirements.
6.How does Aetrix verify that LT8310MPFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8310MPFE#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 LT8310MPFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8310MPFE#PBF?
All LT8310MPFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8310MPFE#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 LT8310MPFE#PBF part is unused and in its original packaging.
Return procedure for LT8310MPFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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