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Analog Devices Inc. LT3753MPFE#TRPBF
- Part No.:
- LT3753MPFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LT3753MPFE#TRPBF.pdf
- Description:
- IC REG CTRLR FWRD CONV 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,162
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Product details
Overview
LT3753MPFE#TRPBF from Analog Devices is a current mode PWM controller optimized for active clamp synchronous forward converters, supporting 8.5V–100V input operation. It delivers programmable volt-second clamping (DVSEC), synchronous rectification control via SOUT, and precise timing delays (tAO, tSO, tOS) for high-efficiency isolated power conversion in harsh environments. Used in 48V telecom isolated supplies and military-grade DC/DC modules.
For engineers reviewing the LT3753MPFE#TRPBF datasheet, LT3753MPFE#TRPBF pinout, LT3753MPFE#TRPBF application, or LT3753MPFE#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature rating, 38-lead TSSOP package with high-voltage pin spacing, active clamp MOSFET timing control, and open-loop DVSEC regulation capability without optocoupler dependency.
Technical Context
The LT3753MPFE#TRPBF implements a primary-side current-mode control architecture with dual independent timing loops: one for active clamp switch (AOUT) relative to main switch (OUT), and another for synchronous rectifier (SOUT) edge alignment. Its volt-second clamp (DVSEC) is programmed via IVSEC and UVLO_VSEC pins using resistor dividers, enabling duty cycle limiting inversely proportional to input voltage to prevent transformer saturation.
It integrates three gate drivers-OUT (main N-MOSFET), AOUT (active clamp N-MOSFET), and SOUT (secondary-side synchronous rectifier)-each with nanosecond-level rise/fall times (<25ns), programmable nonoverlap delays, and robust 11.9V high-level output under 12V INTVCC. The IC features adaptive leading-edge blanking and hiccup-mode overcurrent protection triggered at 96mV on OC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.5V to 100V - supports wide-range industrial, telecom, and military input rails without external pre-regulation. |
| Operating Temp Range | –55°C to 150°C - qualified for extended-temperature applications including avionics and downhole equipment. |
| Switching Frequency | 100kHz to 500kHz - programmable via RT resistor; enables optimization of magnetics size vs. efficiency trade-offs. |
| DVSEC Clamp Accuracy | ±4% max duty cycle error - ensures reliable transformer reset and prevents saturation during line/load transients. |
| OC Threshold | 96mV ±11.5mV - precise primary-side overcurrent detection enabling fast hiccup-mode shutdown without sensing loss. |
| INTVCC Regulator | 10V ±0.6V - powers all gate drivers; dropout <0.6V at 10mA allows stable operation even near VIN minimum. |
| Gate Driver Rise Time | 19–23ns - minimizes switching losses in high-frequency active clamp topologies with fast SiC/GaN switches. |
Pinout & Package
The LT3753MPFE#TRPBF is housed in a 38-lead plastic TSSOP (FE package) with missing pins (23, 25, 27, 29, 31, 33, 35) for enhanced high-voltage creepage and clearance between primary and secondary domains. Exposed pad (Pin 39) is internally connected to PGND and GND and must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (28) | Main power input | Accepts 8.5V–100V; internal linear regulator derives INTVCC; requires 1µF local bypass. |
| INTVCC (26) | Internal LDO output | 10V supply for all gate drivers; must be bypassed with 4.7µF to PGND; can be externally driven. |
| OUT (24) | Main switch driver | Drives N-channel MOSFET gate; 0V–11.9V swing; active pull-down in shutdown. |
| AOUT (32) | Active clamp switch driver | Controls external clamp MOSFET; timing relative to OUT set by TAO resistor. |
| SOUT (30) | Synchronous rectifier driver | Controls secondary-side SR MOSFET; timing relative to OUT set by TOS and TAS resistors. |
| IVSEC (8) | DVSEC clamp programming | Resistor sets maximum duty cycle clamp value; enables open-loop VOUT regulation. |
| UVLO_VSEC (9) | Volt-second clamp reference | Resistor divider sets both UVLO threshold and DVSEC scaling; 5µA hysteresis current enables precise hysteresis setting. |
| OC (22) | Overcurrent sense input | 96mV threshold triggers hiccup mode; Kelvin-connected to source of primary MOSFET. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable volt-second clamp (DVSEC) | Enables open-loop regulation without optocoupler or secondary-side error amplifier, reducing BOM cost and improving transient response. |
| Independent timing control for AOUT/OUT/SOUT | Three dedicated timing pins (TAO, TAS, TOS) allow precise nonoverlap and dead-time tuning to minimize shoot-through and conduction losses. |
| Extended blanking with programmable duration | TBLNK resistor sets blanking window for ISENSEP and OC signals during MOSFET turn-on, eliminating false overcurrent trips. |
| Hiccup-mode overcurrent protection | Auto-retry shutdown on primary-side overcurrent; reduces thermal stress and enables safe fault recovery in unattended systems. |
| Military-grade temperature qualification | Tested and guaranteed over –55°C to 150°C junction range, meeting MIL-STD-883 requirements for reliability-critical applications. |
Applications
| 48V Telecom Isolated Power Supply | Military Vehicle DC/DC Converter |
|---|---|
Use Scenario: 36V–72V input isolated 5V/20A forward converter powering base station RF amplifiers and digital signal processors. IC Role / Device Role / Timing Role: Primary-side controller managing active clamp reset, synchronous rectification, and DVSEC-based output regulation without optocoupler feedback. Use Value: Achieves >92% peak efficiency and eliminates secondary-side feedback components, reducing board area and improving long-term reliability in sealed enclosures. | Use Scenario: Ruggedized 28V–100V input DC/DC module supplying 12V/15A to vehicle mission computers and radar subsystems in extreme ambient conditions. IC Role / Device Role / Timing Role: High-temperature PWM controller providing programmable UVLO/OVLO, hiccup-mode fault protection, and precise gate timing for SiC MOSFETs. Use Value: Maintains stable regulation across –55°C cold start and 150°C under-hood operation while surviving load dumps up to 100V. |
| Industrial Programmable Logic Controller (PLC) Power | Avionics Auxiliary Power Unit (APU) |
Use Scenario: DIN-rail mounted 24V–48V input isolated 5V/10A supply for PLC I/O modules requiring high immunity to EMI and voltage transients. IC Role / Device Role / Timing Role: Active clamp forward controller with programmable soft-start/stop, slope compensation, and adaptive blanking for noise-immune current sensing. Use Value: Eliminates transformer saturation risk during rapid load steps and withstands repetitive 1kV surge events per IEC 61000-4-5 without latch-up. | Use Scenario: 270VDC aircraft bus-derived 28V/8A isolated supply for flight control actuators and inertial navigation sensors. IC Role / Device Role / Timing Role: Primary-side controller implementing DVSEC clamp and synchronized gate drive for high-efficiency GaN-based forward topology. Use Value: Enables compact magnetic design with 500kHz operation and meets DO-160G Section 22 lightning-induced transient requirements via robust timing control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active clamp forward controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3752HFE#TRPBF | High-side active clamp topology; different pinout and timing architecture; no SOUT output. | Designed for high-side clamp configurations only; not suitable for low-side clamp or synchronous rectification control. | Select only when high-side clamp layout is mandatory and secondary-side synchronous rectification is not required. |
| UCC28950PWPR | Fixed 50% max duty cycle; no programmable DVSEC; integrated 5V bias rail; different timing control scheme. | Lacks open-loop volt-second regulation; requires optocoupler for output regulation; limited to ≤50% duty cycle topologies. | Choose for cost-sensitive, non-military applications where 50% duty cycle limit is acceptable and secondary feedback is preferred. |
Compared with LT3752HFE#TRPBF and UCC28950PWPR, the LT3753MPFE#TRPBF uniquely supports low-side active clamp, synchronous rectifier timing, and optocoupler-free DVSEC regulation-making it the only option for high-reliability, wide-input, isolated forward converters requiring >50% duty cycle and extended temperature operation.
Availability
LT3753MPFE#TRPBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, military vehicle DC/DC converters, and industrial PLC power modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT3753MPFE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and aerospace markets.
The LT3753MPFE#TRPBF belongs to Analog Devices' Power by Linear™ active clamp controller family, engineered specifically for high-efficiency, high-reliability isolated DC/DC conversion in extended-temperature and safety-critical applications.
FAQ
What is the operating temperature range of the LT3753MPFE#TRPBF?
The LT3753MPFE#TRPBF is tested and guaranteed to operate from –55°C to 150°C junction temperature. This extended range exceeds commercial and industrial grades, making it suitable for avionics, downhole tools, and military platforms where ambient extremes demand robust silicon. Its MP grade qualification includes full electrical characterization across this range, not just screening.
How does the LT3753MPFE#TRPBF implement volt-second clamping without an optocoupler?
The LT3753MPFE#TRPBF uses its IVSEC and UVLO_VSEC pins to program a precise, input-voltage-compensated duty cycle limit (DVSEC). By scaling the clamp threshold inversely with VIN, it maintains constant volt-seconds across line variations-enabling stable output regulation in open-loop mode. This eliminates optocoupler latency and failure modes while retaining tight transient response.
Can the LT3753MPFE#TRPBF drive SiC or GaN MOSFETs directly?
Yes-the LT3753MPFE#TRPBF's gate drivers deliver 11.9V high-level output with <25ns rise/fall times and ±0.4A peak source/sink current, enabling direct drive of low-Qg SiC and GaN switches. Its programmable nonoverlap delays (tAO, tSO, tOS) further reduce shoot-through risk in high-speed switching topologies without requiring external gate driver ICs.
What is the purpose of the missing pins on the LT3753MPFE#TRPBF TSSOP package?
The LT3753MPFE#TRPBF's 38-lead TSSOP package omits pins 23, 25, 27, 29, 31, 33, and 35 to increase creepage and clearance distances between primary-side (high-voltage) and secondary-side (low-voltage) circuit domains. This physical isolation enhances safety compliance (e.g., reinforced insulation per IEC 60950) and improves reliability in high-voltage isolated forward converter designs.
Does the LT3753MPFE#TRPBF support synchronization to an external clock?
Yes-the LT3753MPFE#TRPBF includes a SYNC pin (Pin 6) that accepts an external clock signal matching its programmed switching frequency (100kHz–500kHz). When enabled, it locks the internal oscillator to the external source, allowing phase-coordinated operation across multiple converters-critical for EMI reduction and multi-rail power sequencing in dense PCB layouts.
LT3753MPFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Forward Converter
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 8.5V ~ 100V
- Frequency - Switching:
- 100kHz ~ 500kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Frequency Control, Soft Start
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3753MPFE#TRPBF FAQ
1.How can I place an order for LT3753MPFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3753MPFE#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 LT3753MPFE#TRPBF reliable?
The price and inventory of LT3753MPFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3753MPFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3753MPFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3753MPFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3753MPFE#TRPBF?
LT3753MPFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3753MPFE#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 LT3753MPFE#TRPBF?
For technical support, including LT3753MPFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3753MPFE#TRPBF requirements.
6.How does Aetrix verify that LT3753MPFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3753MPFE#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 LT3753MPFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3753MPFE#TRPBF?
All LT3753MPFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3753MPFE#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 LT3753MPFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3753MPFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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