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Analog Devices Inc. LT3752EFE-1#PBF
- Part No.:
- LT3752EFE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LT3752EFE-1#PBF.pdf
- Description:
- IC REG CTRLR FWRD CONV 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:103
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Product details
Overview
LT3752EFE-1#PBF from Analog Devices is a current-mode PWM controller optimized for active clamp forward converter topologies with integrated housekeeping DC/DC controller, 10.5V–16V input range, programmable 100kHz–500kHz switching frequency, and synchronous rectification control via SOUT pin. It enables high-efficiency isolated power supplies in automotive and telecom applications.
For engineers reviewing the LT3752EFE-1#PBF datasheet, LT3752EFE-1#PBF pinout, LT3752EFE-1#PBF application, or LT3752EFE-1#PBF equivalent, key selection criteria include its HI-side active clamp topology support, INTVCC regulation at 9.4–10.4V, volt-second clamp programming, hiccup-mode overcurrent protection, and AEC-Q100 qualification for automotive systems.
Technical Context
The LT3752EFE-1#PBF implements a dual-loop architecture: a main forward controller (OUT/AOUT/SOUT) with adaptive leading-edge blanking and programmable tAO/tOA/tSO/tOS delays, and an independent housekeeping controller (HOUT/HCOMP/HFB) operating up to 321kHz with soft-start, OVLO/UVLO, and PGOOD monitoring. Its HI-side active clamp topology (LT3752-1 variant) uses external NMOS for clamp switch drive.
It features two independent oscillators - one for forward conversion (OUT/SOUT/AOUT), another for housekeeping (HOUT) - both programmable via RT resistor and foldback-capable under fault conditions. The INTVCC linear regulator delivers 9.4–10.4V at up to 50mA, with UVLO thresholds at 7.0–7.4V (ON) and 6.8–7.2V (OFF), enabling robust start-up from high-voltage automotive batteries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10.5V to 16V - supports 12V automotive battery systems with margin for cold-crank transients. |
| Switching Frequency | 100kHz to 500kHz - programmable via RT resistor; line regulation ≤0.1%/V ensures stable operation across input range. |
| INTVCC Regulation | 9.4V to 10.4V - powers internal circuitry and gate drivers; dropout ≤0.6V at 10mA load. |
| Volt-Second Clamp | Programmable duty cycle limit - sets maximum OUT on-time based on UVLO_VSEC voltage (e.g., 72.5% at UVLO_VSEC = 2.5V). |
| Overcurrent Protection | Hiccup mode - triggers on OC pin ≥82.5mV; reduces thermal stress during sustained overload. |
| Operating Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive environments. |
| Package | 38-lead TSSOP with missing pins - provides HV spacing between VIN, AOUT, and HISENSE pins for >100V isolation compliance. |
Pinout & Package
The LT3752EFE-1#PBF is housed in a 38-lead plastic TSSOP (FE package, variation FE38(31)) with exposed pad (Pin 39) soldered to PGND/GND for thermal and electrical integrity. Pin spacing accommodates high-voltage isolation requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 10.5V–16V; powers forward controller and INTVCC regulator; includes UVLO/OVLO detection. |
| AOUT | Active clamp switch driver | Drives external NMOS clamp FET; rise/fall time ≤23ns/19ns; high-level = INTVCC – 0.1V. |
| OUT | Main power switch driver | Drives primary-side MOSFET; rise/fall time ≤19ns/20ns; supports >50% duty cycle via volt-second clamp. |
| SOUT | Synchronous rectifier driver | Controls secondary-side SR MOSFET; timing delays tSO/tOS programmable via resistors for ZVS optimization. |
| HOUT | Housekeeping switch driver | Drives auxiliary buck/boost converter; max 95% duty cycle; min ON time = 350ns. |
| UVLO_VSEC | System UVLO sense | Configures input undervoltage lockout threshold and hysteresis; also enables inter-IC shutdown communication. |
| RT | Oscillator timing | Sets forward and housekeeping switching frequencies; supports synchronization via SYNC pin. |
| PGND / GND | Power / signal ground | Separate PGND (Pins 20,21,39) and GND (Pin 18) reduce noise coupling; exposed pad = PGND/GND. |
Key Features
| Feature | Design Value |
|---|---|
| HI-side active clamp topology | Enables use of low-RDS(on) NMOS clamp FETs, reducing voltage stress on main switch and improving efficiency vs. LO-side designs. |
| Integrated housekeeping controller | Eliminates need for external bias supply; generates regulated output for auxiliary rails while supporting soft-start, PGOOD, and hiccup-mode protection. |
| Programmable volt-second clamp | Allows precise control of maximum duty cycle independent of input voltage, enabling optimal transformer utilization in wide-input designs. |
| Synchronous rectification timing control | Independent tSO/tOS delay programming minimizes body-diode conduction loss in secondary-side MOSFETs for >94% peak efficiency. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including engine control units, ADAS power supplies, and infotainment systems operating at –40°C to +125°C. |
Applications
| Automotive Engine Control Unit (ECU) Power Supply | 48V Telecom Isolated DC/DC Converter |
|---|---|
Use Scenario: Provides isolated 5V/3.3V bias rails for microcontrollers and sensors in engine bay environments subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Active clamp forward controller managing primary switch (OUT), clamp switch (AOUT), and synchronous rectifier (SOUT) with precise timing delays. Use Value: Enables >94% efficiency at 48VIN/12.5AOUT while maintaining <100V stress on primary MOSFET via active clamp, meeting stringent automotive thermal budgets. | Use Scenario: Generates isolated 12V/12.5A output from 48V telecom bus for base station RF power amplifiers requiring low noise and high reliability. IC Role / Device Role / Timing Role: Dual-loop controller coordinating main forward stage (OUT/AOUT) and housekeeping rail (HOUT) with independent soft-start and PGOOD signaling. Use Value: Programmable volt-second clamp and hiccup-mode OCP ensure stable operation during line surges and short-circuit events common in telecom infrastructure. |
| Industrial PLC I/O Module Isolation | Military Vehicle Power Distribution |
Use Scenario: Supplies isolated 24V/5A outputs for analog input/output modules in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Forward controller with adaptive blanking and programmable tBLNK timing to reject transformer leakage spikes during reset. Use Value: Robust UVLO/OVLO hysteresis (1.9V typical) prevents false triggering during brown-out conditions typical in industrial AC-DC front-ends. | Use Scenario: Powers mission-critical avionics and comms subsystems from 28V aircraft bus with MIL-STD-704 compliance and extended temperature operation. IC Role / Device Role / Timing Role: AEC-Q100 qualified controller implementing HI-side active clamp for reduced EMI and improved transient response in mobile platforms. Use Value: Exposed-pad TSSOP package with HV spacing meets IPC-2221 creepage/clearance requirements for 250V isolation in compact military PCB layouts. |
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 | Lower VIN range (6.5V–100V); LO-side active clamp (PMOS clamp driver); INTVCC = 6.6–7.2V. | Preferred for offline or wide-input industrial supplies where input exceeds 16V. | Select LT3752EFE#PBF when system input may exceed 16V or requires PMOS-based clamp topology. |
| UCC2897AIPW | No integrated housekeeping controller; requires external bias supply; no synchronous rectifier timing control; non-AEC-Q100. | Suitable for cost-sensitive industrial converters without automotive qualification or auxiliary rail needs. | Choose UCC2897AIPW only if housekeeping integration and AEC-Q100 are not required, and layout allows external bias generation. |
Compared with LT3752EFE#PBF, the LT3752EFE-1#PBF offers higher INTVCC voltage (9.4–10.4V vs. 6.6–7.2V) and HI-side NMOS clamp drive - critical for automotive 12V battery systems - while UCC2897AIPW lacks integrated housekeeping and automotive qualification, increasing BOM count and limiting deployment scope.
Availability
LT3752EFE-1#PBF is available at Aetrix Electronics and suitable for automotive ECU power supplies, 48V telecom isolated converters, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LT3752EFE-1#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/LT3752-1 product line was designed specifically for high-efficiency active clamp forward converters in automotive and telecom applications, integrating housekeeping regulation and precise synchronous rectifier timing to eliminate external bias ICs and reduce system complexity.
FAQ
What is the maximum input voltage supported by the LT3752EFE-1#PBF?
The LT3752EFE-1#PBF supports an operational input voltage range of 10.5V to 16V. This is distinct from the standard LT3752, which operates up to 100V. The LT3752EFE-1#PBF's upper limit is set by its internal INTVCC regulator design and UVLO thresholds, making it optimized for 12V automotive battery systems with cold-crank headroom. Exceeding 16V risks violating absolute maximum ratings.
Does the LT3752EFE-1#PBF support synchronous rectification, and how is timing controlled?
Yes, the LT3752EFE-1#PBF provides dedicated SOUT pin control for synchronous rectification. Timing is precisely managed via programmable delays: tSO (SOUT fall to OUT rise) and tOS (OUT fall to SOUT rise), set using external resistors (RTAS, RTOS). These delays minimize body-diode conduction loss in secondary-side MOSFETs, directly contributing to the 94% peak efficiency demonstrated in typical 12V/12.5A applications.
How does the volt-second clamp function in the LT3752EFE-1#PBF?
The volt-second clamp in the LT3752EFE-1#PBF limits maximum duty cycle based on UVLO_VSEC pin voltage - e.g., 72.5% at 2.5V. It ensures safe transformer reset and prevents core saturation under varying input conditions. Unlike fixed-duty-cycle controllers, this feature allows >50% duty cycle operation while maintaining volt-second balance, maximizing power density and transformer utilization in the LT3752EFE-1#PBF design.
Is the LT3752EFE-1#PBF qualified for automotive applications?
Yes, the LT3752EFE-1#PBF is AEC-Q100 qualified for automotive applications (Grade 1: –40°C to +125°C). Its datasheet specifies guaranteed performance across this junction temperature range, and the EFE grade part marking confirms qualification. This makes the LT3752EFE-1#PBF suitable for engine control units, ADAS power supplies, and other under-hood automotive systems requiring high reliability and thermal robustness.
What is the role of the housekeeping controller integrated into the LT3752EFE-1#PBF?
The integrated housekeeping controller in the LT3752EFE-1#PBF generates a regulated auxiliary output (via HOUT) to power internal circuitry and external bias rails, eliminating the need for a separate DC/DC converter. It includes soft-start, PGOOD monitoring, OVLO/UVLO, and hiccup-mode overcurrent protection - all coordinated with the main forward controller to simplify system design and improve startup reliability in the LT3752EFE-1#PBF implementation.
LT3752EFE-1#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):
- 10.5V ~ 16V
- 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
LT3752EFE-1#PBF FAQ
1.How can I place an order for LT3752EFE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3752EFE-1#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 LT3752EFE-1#PBF reliable?
The price and inventory of LT3752EFE-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3752EFE-1#PBF is usually 5 days.
3.What payment methods are accepted for LT3752EFE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3752EFE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3752EFE-1#PBF?
LT3752EFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3752EFE-1#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 LT3752EFE-1#PBF?
For technical support, including LT3752EFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3752EFE-1#PBF requirements.
6.How does Aetrix verify that LT3752EFE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT3752EFE-1#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 LT3752EFE-1#PBF meets industry standards.
7.What is the process for return or replacement of LT3752EFE-1#PBF?
All LT3752EFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3752EFE-1#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 LT3752EFE-1#PBF part is unused and in its original packaging.
Return procedure for LT3752EFE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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