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Analog Devices Inc. LT3752IFE-1#TRPBF
- Part No.:
- LT3752IFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LT3752IFE-1#TRPBF.pdf
- Description:
- IC REG CTRLR FWRD CONV 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,962
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Product details
Overview
LT3752IFE-1#TRPBF from Analog Devices is a current-mode PWM controller optimized for active clamp forward converter topologies with integrated housekeeping DC/DC controller, supporting input voltages >100V, programmable 100–500kHz switching frequency, and synchronous rectification control via SOUT pin. It enables high-efficiency isolated power supplies in automotive and telecom systems.
For engineers reviewing the LT3752IFE-1#TRPBF datasheet, LT3752IFE-1#TRPBF pinout, LT3752IFE-1#TRPBF application, or LT3752IFE-1#TRPBF equivalent, key selection criteria include its HI-side active clamp topology support, INTVCC regulation at 9.4–10.4V, DVSEC volt-second clamp programming, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LT3752IFE-1#TRPBF implements dual-loop control: a main forward controller (OUT/AOUT/SOUT) with adaptive leading-edge blanking and programmable tAO/tOA/tSO/tOS timing delays, plus an independent housekeeping controller (HOUT/HCOMP/HFB) operating up to 321kHz with soft-start, hiccup-mode overcurrent protection, and 0.9–1.1V HFB reference. Its HI-side active clamp topology (LT3752-1 variant) reduces primary switch voltage stress versus LO-side alternatives.
It features separate, independently programmable oscillators for main and housekeeping loops, synchronized via shared RT resistor; programmable UVLO/OVLO thresholds with hysteresis on VIN and UVLO_VSEC pins; and precision current sensing with 69–86.5mV HISENSE threshold and 9.1V/V transconductance gain for stable peak-current mode control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10.5V to 16V - supports high-input offline and HV car battery systems without external step-down pre-regulator |
| Switching Frequency | 100kHz to 500kHz - adjustable via RT resistor; line regulation ≤0.1%/V ensures stable operation across input range |
| INTVCC Regulation | 9.4V to 10.4V - internal LDO powers gate drivers and logic; dropout ≤0.6V at 10mA enables efficient biasing |
| HFB Reference Voltage | 0.90V to 1.10V - precise housekeeping output voltage setting with ±0.1V tolerance over temperature |
| HISENSE Threshold | 69mV to 86.5mV - low-sense-level current detection enables accurate peak-current limiting for housekeeping inductor |
| AOUT/SOUT Rise Time | ≤23ns / ≤21ns - fast edge rates support high-frequency synchronous rectification with minimal dead-time loss |
| Operating Temp Range | –40°C to +125°C - industrial/automotive junction temperature rating verified per JEDEC JESD22-A108 |
Pinout & Package
LT3752IFE-1#TRPBF is housed in a 38-lead plastic TSSOP package (FE-38) with exposed pad (Pin 39) soldered to PGND/GND for thermal and electrical integrity. High-voltage spacing is achieved via missing pins (Pin 23, Pin 25, Pin 27, Pin 29, Pin 31, Pin 33, Pin 35).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main supply input | Accepts 10.5–16V; powers forward controller and INTVCC LDO; includes micropower start-up (265µA max) |
| INTVCC | Internal LDO output | Regulated 9.4–10.4V supply for gate drivers and internal logic; OVLO/UVLO protected |
| OUT | Main power switch driver | Drives primary-side NMOS; 11.9V high level, 19ns rise/fall time, 0.1V low level |
| AOUT | Active clamp switch driver | HI-side NMOS driver for clamp circuit; tAO/tOA delays programmable via resistors; 11.9V high level |
| SOUT | Synchronous rectifier driver | Controls secondary-side MOSFET; tSO/tOS delays configurable; 21ns rise time minimizes conduction loss |
| HOUT | Housekeeping switch driver | Drives auxiliary DC/DC converter; 90–95% max duty cycle; 13ns rise time |
| HFB | Housekeeping feedback | 0.9–1.1V reference input; PGOOD thresholds at 0.92V/0.96V; OVLO at 1.15–1.206V |
| UVLO_VSEC | Secondary-side UVLO monitor | Detects auxiliary rail undervoltage; micropower threshold (0.2–0.6V); hysteresis current 4–6µA |
| RT | Oscillator timing | Resistor sets both main (OUT/SOUT/AOUT) and housekeeping (HOUT) frequencies; shared timing resource |
| SS1 | Soft-start/stop control | 1.25V activation threshold; 7–16µA charge current; controls frequency and DVSEC clamp during startup/shutdown |
Key Features
| Feature | Design Value |
|---|---|
| HI-side active clamp topology | Reduces primary MOSFET voltage stress in >100V input applications, enabling use of lower-RDS(on) devices and improving efficiency |
| Integrated housekeeping DC/DC controller | Eliminates need for external bias supply; provides regulated 0.9–1.1V feedback reference and hiccup-mode OCP for auxiliary rail |
| Programmable volt-second clamp (DVSEC) | Enables >50% primary duty cycle via UVLO_VSEC pin; supports transformer reset optimization and higher power density |
| Synchronizable dual-loop timing | Single RT resistor sets both main and housekeeping frequencies; SYNC pin allows external clock synchronization for EMI reduction |
| AEC-Q100 qualified | Validated for automotive applications per Grade I (–40°C to +125°C), including HTOL, TC, and ESD testing |
Applications
| Automotive HV Battery Systems | 48V Telecom Power Supplies |
|---|---|
Use Scenario: Isolated 12V/12.5A auxiliary supply from 48–72V vehicle battery for ADAS ECUs and infotainment. IC Role / Device Role / Timing Role: Active clamp forward controller managing primary switch (OUT), clamp switch (AOUT), and synchronous rectifier (SOUT) with programmable timing delays. Use Value: Achieves 94% efficiency at 48VIN/10AOUT while meeting AEC-Q100 requirements and reducing transformer size via >50% duty cycle. | Use Scenario: Isolated 12V/15A power module for 48V distributed telecom base stations with strict EMI limits. IC Role / Device Role / Timing Role: Dual-loop controller synchronizing main (300kHz) and housekeeping (300kHz) switching via shared RT to minimize beat frequencies. Use Value: Enables spread-spectrum-compatible design with programmable tSO/tOS delays to optimize synchronous rectifier timing and reduce conduction loss. |
| Industrial Isolated DC-DC Modules | Military Vehicle Power Conversion |
Use Scenario: 150W isolated forward converter in DIN-rail mounted PLC power supply requiring wide input (18–72V) and high reliability. IC Role / Device Role / Timing Role: Core PWM controller implementing adaptive leading-edge blanking and programmable OVLO/UVLO hysteresis for robust operation under line transients. Use Value: Delivers stable output with short-circuit hiccup protection and soft-stop shutdown, extending system MTBF in harsh environments. | Use Scenario: Ruggedized 24–110V input isolated supply for military radios and C4I systems operating in –40°C to +85°C ambient. IC Role / Device Role / Timing Role: HI-side active clamp controller with 125°C junction-rated package and traceable sourcing for defense logistics compliance. Use Value: Supports MIL-STD-704E input transients via programmable UVLO_VSEC micropower threshold and 2.19V hysteresis, ensuring reliable cold-crank start-up. |
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 |
|---|---|---|---|
| LT3752IFE#TRPBF | LO-side active clamp topology; 6.5–100V input range; INTVCC = 6.6–7.2V; UVLO_VSEC hysteresis = 0.1–0.5V | Optimized for <100V inputs (e.g., 24V/48V industrial); not rated for >100V direct connection | Select when input stays below 100V and LO-side clamp layout is preferred for PCB routing simplicity |
| UCC2897APWR | TI controller with similar active clamp architecture but no integrated housekeeping DC/DC; requires external bias; 12–100V input | Lacks auxiliary regulator - needs external IC or winding for bias; less integration for multi-rail systems | Choose when cost sensitivity outweighs integration benefits and existing design uses discrete housekeeping supply |
Compared with LT3752IFE#TRPBF and UCC2897APWR, the LT3752IFE-1#TRPBF uniquely combines >100V input capability, HI-side clamp drive, and fully integrated housekeeping controller - eliminating three external components and simplifying AEC-Q100-compliant designs.
Availability
LT3752IFE-1#TRPBF is available at Aetrix Electronics and suitable for automotive HV battery systems, 48V telecom power supplies, and industrial isolated DC-DC modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3752IFE-1#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. 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 demanding isolated power applications, emphasizing integration, reliability, and automotive-grade qualification.
FAQ
What is the maximum input voltage supported by the LT3752IFE-1#TRPBF?
The LT3752IFE-1#TRPBF supports an operational input voltage range of 10.5V to 16V, optimized for systems where the main input exceeds 100V - it achieves this via internal high-voltage architecture and dedicated biasing, unlike the standard LT3752 which caps at 100V. This makes the LT3752IFE-1#TRPBF ideal for HV automotive and telecom applications where direct high-voltage interface is required without external pre-regulation.
How does the LT3752IFE-1#TRPBF implement active clamp control?
The LT3752IFE-1#TRPBF uses a HI-side active clamp topology, driving an external NMOS clamp switch via the AOUT pin with programmable timing delays (tAO and tOA). This configuration reduces voltage stress on the main primary switch (driven by OUT), improves transformer reset efficiency, and enables duty cycles above 50%. The LT3752IFE-1#TRPBF's AOUT driver delivers 11.9V high level and 23ns rise time, ensuring precise control of the clamp MOSFET in high-frequency forward converters.
Does the LT3752IFE-1#TRPBF include an integrated housekeeping DC/DC controller?
Yes, the LT3752IFE-1#TRPBF integrates a complete housekeeping DC/DC controller with HOUT, HCOMP, and HFB pins. It regulates an auxiliary output using a 0.9–1.1V reference (HFB), provides hiccup-mode overcurrent protection, and supports soft-start/soft-stop sequencing. This eliminates the need for an external bias supply - a key differentiator from controllers like UCC2897APWR - and simplifies design for multi-output isolated systems.
What is the purpose of the UVLO_VSEC pin on the LT3752IFE-1#TRPBF?
The UVLO_VSEC pin on the LT3752IFE-1#TRPBF monitors the auxiliary (housekeeping) supply rail for undervoltage lockout, with a micropower threshold of 0.2–0.6V and hysteresis current of 4–6µA. It enables safe startup/shutdown sequencing, supports communication between stacked supplies via a 2µs one-shot current pulse, and directly controls the DVSEC volt-second clamp function - making it essential for reliable operation in fault-tolerant and multi-module power architectures.
Is the LT3752IFE-1#TRPBF qualified for automotive applications?
Yes, the LT3752IFE-1#TRPBF is AEC-Q100 qualified for automotive applications (Grade I: –40°C to +125°C junction temperature). It undergoes rigorous stress testing including HTOL, temperature cycling, and ESD per automotive standards. Its HI-side active clamp architecture, integrated housekeeping controller, and robust UVLO/OVLO protections make it suitable for ADAS, infotainment, and body electronics powered from HV battery rails.
LT3752IFE-1#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):
- 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
LT3752IFE-1#TRPBF FAQ
1.How can I place an order for LT3752IFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3752IFE-1#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 LT3752IFE-1#TRPBF reliable?
The price and inventory of LT3752IFE-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3752IFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3752IFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3752IFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3752IFE-1#TRPBF?
LT3752IFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3752IFE-1#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 LT3752IFE-1#TRPBF?
For technical support, including LT3752IFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3752IFE-1#TRPBF requirements.
6.How does Aetrix verify that LT3752IFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3752IFE-1#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 LT3752IFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3752IFE-1#TRPBF?
All LT3752IFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3752IFE-1#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 LT3752IFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3752IFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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