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Analog Devices Inc. LT3752IFE#PBF
- Part No.:
- LT3752IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LT3752IFE#PBF.pdf
- Description:
- IC REG CTRLR FWRD CONV 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:216
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Product details
Overview
LT3752IFE#PBF from Analog Devices is a current-mode PWM controller optimized for active clamp forward converter topologies, featuring integrated DC/DC housekeeping control, programmable volt-second clamp (supporting >50% duty cycle), active clamp MOSFET drive (AOUT), synchronous rectifier control (SOUT), and 100V input capability. It enables high-efficiency isolated power supplies in telecom and industrial systems.
For engineers reviewing the LT3752IFE#PBF datasheet, LT3752IFE#PBF pinout, LT3752IFE#PBF application, or LT3752IFE#PBF equivalent, key selection criteria include its 6.5V–100V input range, 100kHz–500kHz programmable switching frequency, active clamp timing control (tAO/tOA), synchronous rectification delays (tSO/tOS), and –40°C to 125°C operating junction temperature.
Technical Context
The LT3752IFE#PBF implements dual-loop control: a main forward controller with adaptive leading-edge blanking, programmable slope compensation, and volt-second clamp (DVSEC) for primary-side duty cycle regulation; and an independent housekeeping DC/DC controller with HFB reference (1.000V), HOUT gate driver, and hiccup-mode overcurrent protection.
It supports LO-side active clamp topology (LT3752 variant), provides three independent gate drivers (OUT, AOUT, SOUT) with sub-25ns rise/fall times, and features synchronized operation via external clock input (1.25kHz/kHz ratio) and precise UVLO/OVLO thresholds with hysteresis for robust system start-up and fault recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.5V to 100V - supports wide-input isolated DC/DC conversion without external pre-regulation. |
| Switching Frequency | 100kHz to 500kHz - programmable via RT resistor; line regulation ≤0.1%/V ensures stable operation across input range. |
| FB Reference Voltage | 1.250V ±25mV - precision error amplifier reference enabling accurate output voltage regulation. |
| INTVCC Regulator | 7.0V ±0.2V - internal linear regulator powers internal circuitry; UVLO at 4.75V/4.85V prevents erratic startup. |
| Operating Temperature | –40°C to 125°C - qualified for industrial and automotive environments per IFE grade specification. |
| Gate Driver Outputs | OUT/AOUT/SOUT - each delivers 11.9V high-level drive with <25ns edge speeds into 1nF load for efficient MOSFET switching. |
| Volt-Second Clamp | Programmable DVSEC - enables >50% primary duty cycle while maintaining transformer reset and reducing voltage stress on main switch. |
Pinout & Package
The LT3752IFE#PBF is housed in a 38-lead plastic TSSOP package (FE38 variation) with missing pins for high-voltage spacing; exposed pad (Pin 39) is connected to PGND/GND and must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 6.5V–100V supply; powers forward controller and INTVCC regulator. |
| INTVCC | Internal LDO output | 7.0V regulated supply for internal logic and gate drivers; requires 2.2µF bypass capacitor. |
| OUT | Main switch driver | Drives primary-side N-channel MOSFET; 11.9V high-level, 0.1V low-level, 19ns rise time. |
| AOUT | Active clamp switch driver | Drives external PMOS clamp switch; supports programmable tAO/tOA delays for optimal clamp timing. |
| SOUT | Synchronous rectifier driver | Controls secondary-side MOSFET; supports programmable tSO/tOS delays to minimize conduction loss. |
| FB | Output voltage feedback | Connects to resistive divider; 1.250V reference enables precise output regulation. |
| HFB | Housekeeping output feedback | 0.90–1.10V reference for auxiliary DC/DC controller; enables independent bias rail generation. |
| RT | Oscillator timing | Resistor sets forward controller frequency (100–500kHz); also programs DVSEC foldback ratio. |
| SS1 | Soft-start/stop control | Charges to 1.25V to enable switching; discharge current configurable for controlled shutdown. |
| ISENSEP / ISENSEN | Main current sense inputs | Differential sensing of primary-side current; 220mV threshold with 6.1V/V gain for peak-current mode control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated housekeeping controller | Provides dedicated 300kHz DC/DC regulator (HOUT) with 0.90–1.10V HFB reference, eliminating need for external bias supply. |
| Programmable volt-second clamp | Enables >50% primary duty cycle via DVSEC pin, improving transformer and switch utilization in high-input-ratio forward converters. |
| Active clamp control | Reduces voltage stress on main switch by recycling leakage energy; AOUT driver supports external PMOS clamp with precise timing delays. |
| Synchronous rectification support | SOUT driver with programmable tSO/tOS delays minimizes body-diode conduction loss on secondary-side MOSFETs. |
| Hiccup-mode overcurrent protection | OC pin triggers automatic restart after fault clearance; prevents thermal runaway during sustained overload conditions. |
Applications
| Telecom 48V Isolated PSU | Industrial HV Input Supply |
|---|---|
Use Scenario: 48V telecom rectifier feeding isolated 12V/12.5A output for base station subsystems. IC Role / Device Role / Timing Role: LT3752IFE#PBF acts as active clamp forward controller managing primary switch (OUT), clamp switch (AOUT), and synchronous rectifier (SOUT) with precise timing coordination. Use Value: Achieves 94% efficiency at 48VIN/10AOUT by minimizing switching losses and enabling >50% duty cycle for optimal transformer utilization. | Use Scenario: Industrial PLC power module accepting 18–72V DC input and delivering isolated 12V/12.5A for field I/O and logic rails. IC Role / Device Role / Timing Role: LT3752IFE#PBF serves as core PWM controller with integrated housekeeping regulator (HOUT/HFB) powering auxiliary circuits independently. Use Value: Eliminates external bias supply, reduces BOM count, and maintains stable operation across wide input range with programmable UVLO/OVLO hysteresis. |
| Automotive Battery-Connected PSU | Military Ruggedized Power |
Use Scenario: 24V/48V vehicle battery-powered isolated supply for infotainment or ADAS domain controllers. IC Role / Device Role / Timing Role: LT3752IFE#PBF operates as AEC-Q100 qualified forward controller with micropower start-up (265µA VIN current) and robust fault protection. Use Value: Ensures reliable cold-crank operation down to 6.5V input and survives load-dump transients via 100V absolute max VIN rating. | Use Scenario: Ruggedized 150W isolated DC/DC converter for airborne or ground vehicle electronics requiring extended temperature operation. IC Role / Device Role / Timing Role: LT3752IFE#PBF functions as radiation-tolerant-capable forward controller with –40°C to 125°C guaranteed performance and exposed-pad thermal management. Use Value: Delivers stable output under thermal cycling and vibration via TSSOP-38 package with soldered exposed pad (Pin 39 = PGND/GND). |
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 |
|---|---|---|---|
| LT3752EFE#PBF | Same functionality and pinout; rated for 0°C to 125°C junction temperature (vs. –40°C to 125°C for IFE grade). | Not suitable for extended cold ambient environments; lacks full industrial temperature qualification. | Select LT3752IFE#PBF when operation below 0°C is required or industrial-grade reliability is mandated. |
| UCC2897A | TI active clamp forward controller; supports 12V–100V input but lacks integrated housekeeping DC/DC controller and programmable DVSEC clamp. | Requires external bias supply and separate timing circuitry for volt-second control; less integrated solution. | Choose LT3752IFE#PBF when integrated housekeeping and precise DVSEC programming are needed to reduce component count and improve efficiency. |
Compared with LT3752EFE#PBF, the LT3752IFE#PBF extends guaranteed operation to –40°C and offers tighter parametric specifications over full temperature range; versus UCC2897A, it integrates housekeeping regulation and DVSEC control, simplifying design and improving light-load efficiency.
Availability
LT3752IFE#PBF is available at Aetrix Electronics and suitable for telecom 48V isolated PSUs, industrial HV input supplies, and automotive battery-connected power systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT3752IFE#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 digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3752 product line is designed for high-efficiency active clamp forward converters in isolated power applications, emphasizing integration (housekeeping controller), precision timing control (DVSEC, tAO/tOA, tSO/tOS), and rugged operation across wide input voltage and temperature ranges.
FAQ
What is the maximum input voltage supported by the LT3752IFE#PBF?
The LT3752IFE#PBF supports an operational input voltage range of 6.5V to 100V. Its absolute maximum rating for VIN is 100V, making it suitable for high-input-ratio isolated forward converters in telecom and industrial applications where transient overvoltage resilience is critical. This rating applies specifically to the LT3752 variant (not LT3752-1).
Does the LT3752IFE#PBF include an integrated housekeeping DC/DC controller?
Yes, the LT3752IFE#PBF integrates a dedicated housekeeping DC/DC controller with HFB reference (1.000V typical), HOUT gate driver, and programmable soft-start. This eliminates the need for an external bias supply, reduces system component count, and improves overall efficiency-especially at light loads-by powering auxiliary circuitry independently from the main forward converter loop.
How does the programmable volt-second clamp (DVSEC) function in the LT3752IFE#PBF?
The DVSEC pin on the LT3752IFE#PBF enables programmable volt-second clamp control, allowing primary-side duty cycles above 50% while ensuring proper transformer reset. By setting UVLO_VSEC voltage (1.25V typical), designers configure maximum allowable DVSEC value (e.g., 72.5% at 2.50V), directly improving transformer and switch utilization in high-input-ratio forward converters without compromising reliability.
What are the key timing parameters controlled by the LT3752IFE#PBF for active clamp and synchronous rectification?
The LT3752IFE#PBF provides independent programmable delays: tAO (AOUT rise to OUT rise, 168–403ns), tOA (OUT fall to AOUT edge, 150–376ns), tSO (SOUT fall to OUT rise, ±132ns), and tOS (OUT fall to SOUT rise, 52–164ns). These are set using external resistors (RTAO, RTAS, RTOS) and ensure optimal overlap/gap timing to minimize switching losses and prevent shoot-through in both clamp and synchronous rectifier stages.
Is the LT3752IFE#PBF qualified for automotive applications?
Yes, the LT3752IFE#PBF is AEC-Q100 qualified for automotive applications. It is specified for operation from –40°C to 125°C junction temperature and includes features critical for automotive use: micropower start-up current (265µA), robust UVLO/OVLO with hysteresis, hiccup-mode overcurrent protection, and 100V absolute maximum input voltage to withstand load-dump transients commonly encountered in vehicle electrical systems.
LT3752IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Packaging:
- Tube
- 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):
- 6.5V ~ 100V
- Frequency - Switching:
- 100kHz ~ 500kHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3752IFE#PBF FAQ
1.How can I place an order for LT3752IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3752IFE#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 LT3752IFE#PBF reliable?
The price and inventory of LT3752IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3752IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3752IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3752IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3752IFE#PBF?
LT3752IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3752IFE#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 LT3752IFE#PBF?
For technical support, including LT3752IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3752IFE#PBF requirements.
6.How does Aetrix verify that LT3752IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3752IFE#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 LT3752IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3752IFE#PBF?
All LT3752IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3752IFE#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 LT3752IFE#PBF part is unused and in its original packaging.
Return procedure for LT3752IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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