My Inquiry
My Account
Analog Devices Inc. LT8310MPFE#TRPBF
- Part No.:
- LT8310MPFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Datasheet:
-
LT8310MPFE#TRPBF.pdf
- Description:
- IC MOSFET DRIVER SYNC 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,169
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8310MPFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage resonant-reset forward converter controller driving a low-side N-channel MOSFET with an internally regulated 10V gate supply. It delivers duty-mode control for isolated output regulation without optocoupler feedback, supports 6V–100V input, 100kHz–500kHz programmable switching frequency, and features synchronous secondary-side control via SOUT pin. It is used in rugged 48V telecom power supplies and military-grade isolated DC/DC converters.
For engineers reviewing the LT8310MPFE#TRPBF datasheet, LT8310MPFE#TRPBF pinout, LT8310MPFE#TRPBF application, or LT8310MPFE#TRPBF equivalent, key selection criteria include its –55°C to +150°C extended temperature grade, 20-lead TSSOP package with HV pin spacing, duty-mode vs current-mode operation flexibility, and transformer-based volt-second accuracy for flux-saturation immunity.
Technical Context
The LT8310MPFE#TRPBF implements a patent-pending duty-mode control loop where duty cycle D ∝ 1/VIN, enabling stable isolated output voltage without feedback-achieved by precise 20µA sink at RDVIN and internal transconductance error amplifier (250 µA/V). Its dual-mode architecture allows seamless transition between duty mode (FBX grounded) and current mode (FBX connected), with programmable maximum duty limit (78% typ) and minimum on-time (190 ns) ensuring transformer reset integrity.
Protection is implemented via independent UVLO/OVLO thresholds (1.22 V / 1.25 V with hysteresis), 125 mV current sense threshold, thermal shutdown at 165°C, and hiccup-mode overcurrent response. The SS pin controls soft-start with 50 µA charge and 6 mA discharge, while SYNC enables external clock synchronization and SOUT provides non-overlapping timing (tPRE = 240 ns typ, tPOST = 12 ns typ) for synchronous rectification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 100 V - supports wide-range industrial, telecom, and military input rails without external pre-regulation |
| Switching Frequency | 100 kHz to 500 kHz - user-programmable via RT resistor; enables optimization of efficiency, EMI, and magnetics size |
| Duty Cycle Limit | 78 % max - guarantees sufficient off-time for transformer flux reset in resonant-reset forward topology |
| Operating Temp Range | –55°C to +150°C - qualified for extended military and harsh-environment applications |
| INTVCC Regulator | 10.0 V ±0.4 V - powers gate driver and internal circuitry; dropout <600 mV at 20 mA ensures stability across input range |
| SENSE Threshold | 125 mV ±10 mV - sets primary-side overcurrent protection point; Kelvin-sense compatible for accurate MOSFET current monitoring |
| UVLO Threshold | 1.220 V (falling) with 40 mV hysteresis - defines system startup voltage and prevents brownout oscillation |
Pinout & Package
LT8310MPFE#TRPBF is housed in a 20-lead plastic TSSOP (FE package) with exposed pad (Pin 21) soldered to ground plane for thermal and electrical integrity. Pin spacing meets HV requirements for >100 V standoff.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UVLO (1) | System undervoltage lockout input | Resistive divider sets 1.22 V falling threshold; 5.7 µA hysteresis current enables precise startup/brownout recovery |
| OVLO (3) | System overvoltage lockout input | Resistive divider sets 1.25 V rising threshold; fault latch forces shutdown above programmed VIN limit |
| DFILT (5) | Duty cycle loop filter node | Capacitor to GND sets loop pole; critical for damping load-step ringing in duty-mode operation |
| RT (6) | Oscillator timing resistor input | Resistor to GND programs fSW; 20 kΩ–100 kΩ yields 500 kHz–100 kHz; must be placed close to pin |
| SYNC (7) | External clock synchronization input | Falling edge triggers minimum off-time; requires ≥250 ns high/low times; overrides internal oscillator |
| SS (8) | Soft-start timing capacitor node | 50 µA charge / 6 mA discharge controls ramp-up; folds frequency/duty until VSS > 2.5 V |
| VC (9) | Error amplifier output | Transconductance output (250 µA/V); used for loop compensation in current-mode designs |
| FBX (10) | Feedback input & mode select | 1.6 V (positive) or –0.8 V (negative) reference; –0.2 V to 0.3 V range selects duty mode; otherwise enables current mode |
| SOUT (11) | Synchronous rectifier driver | Complementary to GATE; leads GATE turn-on by 240 ns, trails turn-off by 12 ns; drives pulse transformer |
| NC (12) | No internal connection | Must be connected to GND per datasheet; no functional role |
| SENSE (13) | Primary-side current sense input | Positive input to overcurrent comparator; 125 mV threshold protects against MOSFET short-circuit |
| GATE (14) | N-channel MOSFET gate driver | 0.05 V low / INTVCC – 0.05 V high; 30 ns rise / 27 ns fall into 3.3 nF; actively pulled to GND in shutdown |
| INTVCC (15) | Internally regulated 10 V supply | Supplies gate driver and internal logic; requires ≥4.7 µF bypass; can be externally driven up to 17 V |
| RDVIN (16) | Duty set current sink | 20 µA nominal sink; sets VSET = VINTVCC – VRDVIN; determines output voltage in duty mode via RSET |
| VIN (18) | Main supply and input voltage sense | 6 V–100 V operating range; senses VIN for duty calculation; requires short, low-impedance path to transformer primary |
| NC (20) | No internal connection | Must be connected to VIN per datasheet; no functional role |
| GND (21) | Ground and current sense return | Exposed pad; must be soldered to PCB ground plane; also serves as Kelvin return for SENSE resistor |
Key Features
| Feature | Design Value |
|---|---|
| Duty-mode control without optocoupler | Enables isolated output regulation using only transformer turns ratio-reducing BOM count and eliminating opto aging drift |
| Programmable 100 kHz–500 kHz switching | Allows trade-off between efficiency (lower fSW) and magnetics size (higher fSW) without redesigning control loop |
| Synchronous secondary-side drive (SOUT) | Provides precisely timed, non-overlapping signal to drive external synchronous rectifiers-improving conversion efficiency by >3% |
| –55°C to +150°C operating range (MP grade) | Qualified for aerospace, defense, and downhole applications where commercial or industrial grades fail |
| Transformer volt-second accuracy | Patent-pending architecture maintains D × VIN constancy across 6–100 V input-preventing core saturation during line transients |
| Hiccup-mode overcurrent protection | Enters fast-shutdown/slow-wake cycle on SENSE overcurrent-limiting average power dissipation during sustained faults |
Applications
| Telecom Isolated Power Supply | Military Vehicle DC/DC Converter |
|---|---|
Use Scenario: 48 V telecom rack supplying isolated 12 V/6.5 A to line cards with strict ripple and transient response requirements. IC Role / Device Role / Timing Role: Forward controller managing primary-side switch timing, duty modulation, and synchronous rectifier coordination via SOUT. Use Value: Eliminates optocoupler while maintaining ±8% VOUT load regulation across 0.6–6.5 A; 100 V input rating handles surge events per GR-1089. | Use Scenario: 28 V vehicle battery powering isolated 5 V/3 A avionics subsystems in vibration-prone, wide-temperature environments. IC Role / Device Role / Timing Role: Resonant-reset forward controller enforcing transformer flux reset and providing hiccup-mode fault containment. Use Value: MP-grade –55°C to +150°C operation ensures reliability in unheated enclosures; 78% max duty cycle guarantees core reset under cold cranking (24 V min). |
| Industrial Process Controller PSU | Downhole Oilfield Sensor Power |
Use Scenario: 24–72 V industrial bus powering isolated 15 V/2 A analog I/O modules requiring low EMI and long-term stability. IC Role / Device Role / Timing Role: Duty-mode controller regulating output via transformer ratio, with programmable frequency to avoid noise-sensitive bands. Use Value: 100 kHz–500 kHz tuning avoids 400 Hz motor harmonics; DFILT filtering minimizes load-step overshoot to <150 mV. | Use Scenario: High-temp wellhead electronics powered from surface 400 V DC bus, requiring isolated 3.3 V/0.5 A at 175°C ambient. IC Role / Device Role / Timing Role: Primary-side controller operating in duty mode with external HV MOSFET and custom high-temp transformer. Use Value: MP-grade qualification and 100 V input rating enable direct connection to segmented DC bus; RDVIN-based VOUT setting avoids feedback degradation at temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar forward converter controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMSE#TRPBF | Requires optocoupler feedback; no duty-mode operation; 60 V max input; MSOP-10 package | Designed for isolated flyback, not forward topology; lacks SOUT and RDVIN-based duty programming | Choose when opto-isolation is mandated and input <60 V; not suitable for opto-free forward designs |
| UCC2891DR | Fixed 275 kHz frequency; no programmable fSW; 100 V input; SOIC-16; no SOUT pin | Legacy forward controller with basic UVLO/OVLO; no synchronous rectifier support or soft-start foldback | Choose for cost-sensitive, fixed-frequency forward designs where SOUT and advanced protection are unnecessary |
Compared with LT3748EMSE#TRPBF and UCC2891DR, the LT8310MPFE#TRPBF uniquely combines opto-free duty-mode regulation, 100 V input, SOUT-driven synchronous rectification, and –55°C to +150°C operation-making it the only choice for high-reliability, transformer-only isolated forward converters in extreme environments.
Availability
LT8310MPFE#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, military vehicle DC/DC converters, and downhole sensor power systems requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for LT8310MPFE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT8310MPFE#TRPBF belongs to ADI's Power by Linear™ forward controller product line, engineered specifically for rugged isolated DC/DC conversion in aerospace, defense, and industrial applications where reliability, wide input range, and transformer-centric design are mandatory.
FAQ
What is the operating temperature range of the LT8310MPFE#TRPBF?
The LT8310MPFE#TRPBF is rated for –55°C to +150°C junction temperature, qualifying it for extended military, aerospace, and downhole applications. This MP-grade specification exceeds commercial (E), industrial (I), and high-reliability (H) variants, and is verified across all electrical parameters in the datasheet's "Electrical Characteristics" table under the "LT8310MP" column.
Can the LT8310MPFE#TRPBF operate without an optocoupler?
Yes-the LT8310MPFE#TRPBF supports true opto-free operation via its duty-mode control architecture. When FBX is grounded, the controller regulates output voltage solely using the transformer turns ratio and the RDVIN 20 µA sink, eliminating optocoupler drift, aging, and bandwidth limitations while maintaining ±8% VOUT load regulation.
How does the LT8310MPFE#TRPBF prevent transformer saturation?
The LT8310MPFE#TRPBF prevents transformer saturation through two mechanisms: (1) a hard 78% maximum duty cycle limit ensures minimum off-time for flux reset each cycle, and (2) its patent-pending duty-mode loop enforces D × VIN constancy-maintaining precise volt-second balance across the full 6–100 V input range, even during fast line transients.
What is the function of the SOUT pin on the LT8310MPFE#TRPBF?
The SOUT pin on the LT8310MPFE#TRPBF provides a non-overlapping, complementary timing signal to GATE-leading GATE turn-on by 240 ns and trailing GATE turn-off by 12 ns. It is designed to drive external synchronous rectifiers or pulse transformers in forced continuous conduction mode (FCCM), improving efficiency by reducing secondary-side conduction losses.
Is the LT8310MPFE#TRPBF pin-compatible with other LT8310 variants?
Yes-the LT8310MPFE#TRPBF shares identical pinout, package (20-lead TSSOP), and electrical interface with LT8310EFE#TRPBF, LT8310IFE#TRPBF, and LT8310HFE#TRPBF. Only the temperature grading differs; all variants use the same FE package footprint and require identical PCB layout, decoupling, and thermal design.
LT8310MPFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT8310MPFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8310MPFE#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 LT8310MPFE#TRPBF reliable?
The price and inventory of LT8310MPFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8310MPFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8310MPFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8310MPFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8310MPFE#TRPBF?
LT8310MPFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8310MPFE#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 LT8310MPFE#TRPBF?
For technical support, including LT8310MPFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8310MPFE#TRPBF requirements.
6.How does Aetrix verify that LT8310MPFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8310MPFE#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 LT8310MPFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8310MPFE#TRPBF?
All LT8310MPFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8310MPFE#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 LT8310MPFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8310MPFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8310MPFE#TRPBF Tags
-
UC3845AD8TR
Texas Instruments
-
UC2843AD8TR
Texas Instruments
-
LM3880MFX-1AE/NOPB
Texas Instruments
-
LM3880MFX-1AA/NOPB
Texas Instruments
-
INA234AIYBJR
Texas Instruments
-
INA700AYWFR
Texas Instruments
-
LM3880MF-1AE/NOPB
Texas Instruments
-
LM3880MF-1AA/NOPB
Texas Instruments
-
LM3881MM/NOPB
Texas Instruments
-
UCC2802DTR
Texas Instruments
-
NCP4305DMTTWG
onsemi
-
INA237AIDGSR
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…
