My Inquiry
My Account
Analog Devices Inc. LT3752MPFE#TRPBF
- Part No.:
- LT3752MPFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LT3752MPFE#TRPBF.pdf
- Description:
- IC REG CTRLR FWRD CONV 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,309
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3752MPFE#TRPBF from Analog Devices is a high-reliability active clamp synchronous forward controller with integrated housekeeping DC/DC controller, rated for –55°C to 150°C operation. It supports 6.5V–100V input, programmable 100–500kHz switching frequency, volt-second clamp for >50% duty cycle, and dual gate drivers (OUT/AOUT/SOUT) for primary switch, active clamp MOSFET, and synchronous rectifier - used in isolated 48V telecom and automotive power supplies.
For engineers reviewing the LT3752MPFE#TRPBF datasheet, LT3752MPFE#TRPBF pinout, LT3752MPFE#TRPBF application, or LT3752MPFE#TRPBF equivalent, key selection criteria include its extended temperature grade (–55°C to 150°C), AEC-Q100 qualification, active clamp timing control (tAO/tOA/tSO/tOS), INTVCC regulation at 7.0V (LT3752 variant), and programmable UVLO/OVLO with hysteresis.
Technical Context
The LT3752MPFE#TRPBF implements current-mode PWM control for active clamp forward topology with adaptive leading edge blanking and programmable extended blanking. Its dual-loop architecture integrates a main forward controller (OUT/AOUT/SOUT) and an independent housekeeping controller (HOUT/HCOMP/HFB) with separate soft-start, current sensing, and overvoltage protection.
It features programmable volt-second clamp (DVSEC) via UVLO_VSEC pin to set maximum duty cycle, synchronized timing delays between OUT–AOUT (tAO/tOA) and OUT–SOUT (tSO/tOS), and micropower start-up with <265µA VIN current for LT3752-1 variants - though LT3752MPFE#TRPBF is the LT3752 (not -1) version per order information and absolute max ratings (VIN ≤100V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.5V to 100V - supports wide-input industrial and automotive battery systems without external pre-regulation. |
| Switching Frequency | 100kHz to 500kHz - programmable via RT resistor; enables optimization of transformer size, efficiency, and EMI. |
| Operating Temp Range | –55°C to 150°C - fully tested and guaranteed, suitable for under-hood automotive and harsh-environment industrial use. |
| INTVCC Regulator | 7.0V ±0.2V - powers internal circuitry; dropout voltage ≤0.8V ensures stable operation down to VIN = 6.5V. |
| FB Reference Voltage | 1.250V ±25mV - precision error amplifier reference for accurate output voltage regulation. |
| Volt-Second Clamp | Programmable via UVLO_VSEC pin - sets maximum duty cycle (e.g., 72.5% at UVLO_VSEC = 2.5V) to prevent transformer saturation. |
| AEC-Q100 Grade | Qualified - meets automotive reliability standards for temperature cycling, HTOL, and ESD robustness. |
Pinout & Package
LT3752MPFE#TRPBF 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 performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 6.5V–100V; powers forward controller and INTVCC regulator. |
| INTVCC | Internal LDO output | 7.0V regulated supply for internal logic and gate drivers; current-limited to 60mA. |
| OUT | Main switch driver | High-current N-channel MOSFET gate driver (11.9V high level, 19ns fall time) for primary-side switch. |
| AOUT | Active clamp driver | Gate driver for external PMOS clamp switch (LT3752 variant); tAO/tOA delays programmable via resistors. |
| SOUT | Synchronous rectifier driver | Driver for secondary-side NMOS rectifier; tSO/tOS delays configurable for optimal ZVS/ZCS timing. |
| FB | Output voltage feedback | Connects to resistor divider; 1.25V reference enables precise regulation of isolated output. |
| HFB / HCOMP | Housekeeping controller I/O | HFB is error amp input for auxiliary rail; HCOMP is transconductance amplifier output for housekeeping loop. |
| RT | Oscillator timing | Resistor sets main switching frequency (100–500kHz) and housekeeping frequency foldback. |
| UVLO_VSEC | Volt-second clamp control | Analog input setting DVSEC clamp threshold; determines max duty cycle (e.g., 72.5% at 2.5V). |
| SS1 / SS2 | Soft-start/stop control | SS1 controls frequency/DVSEC ramp; SS2 controls COMP pin soft-start to prevent overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Active clamp topology support | Reduces primary switch voltage stress by recycling leakage energy, enabling higher efficiency (>94% demonstrated) and smaller magnetics. |
| Integrated housekeeping controller | Provides dedicated 300kHz DC/DC regulator for bias rails - eliminates need for external auxiliary supply and improves system efficiency. |
| Programmable timing delays | tAO (AOUT rise to OUT rise), tSO (SOUT fall to OUT rise), and tOS (OUT fall to SOUT rise) are resistor-programmable for precise ZVS/ZCS optimization. |
| Hiccup-mode overcurrent protection | Auto-retry shutdown on OC fault (threshold 96mV on OC pin); prevents thermal runaway during short-circuit events. |
| Micropower shutdown | VIN quiescent current drops to 40µA in shutdown - critical for battery-backed or always-on automotive systems. |
Applications
| Automotive Battery Isolation | 48V Telecom Power |
|---|---|
Use Scenario: Isolated 12V/12.5A auxiliary supply from 48V vehicle battery in ADAS ECUs. IC Role / Device Role / Timing Role: LT3752MPFE#TRPBF acts as active clamp forward controller managing primary switch, clamp MOSFET, and synchronous rectifier with precise tAO/tSO timing. Use Value: Enables >94% efficiency at full load and AEC-Q100 compliance for under-hood deployment with –55°C cold-crank tolerance. | Use Scenario: 48V-to-12V isolated DC/DC module for telecom base station line cards. IC Role / Device Role / Timing Role: Controls active clamp forward converter with programmable volt-second clamp to maintain stability across wide input transients (e.g., 36–72V). Use Value: Supports high-power density design (150W) with minimal external components and no optocoupler required for DVSEC open-loop control. |
| Industrial HV Power Supply | Military Vehicle Power System |
Use Scenario: Off-line 100V-input isolated supply for industrial PLC I/O modules. IC Role / Device Role / Timing Role: LT3752MPFE#TRPBF serves as primary controller with UVLO/OVLO hysteresis programming for brownout/overvoltage immunity. Use Value: Full 100V input rating and –55°C to 150°C operation ensure reliability in unregulated AC-DC front-end environments. | Use Scenario: Ruggedized 28V-to-5V/3.3V isolated supply for avionics subsystems requiring MIL-STD-704 compliance. IC Role / Device Role / Timing Role: Implements dual-loop control: main forward converter for primary output and housekeeping controller for auxiliary bias rails. Use Value: Integrated housekeeping controller eliminates external bias IC, reducing BOM count and improving startup robustness in cold-soak conditions. |
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 | Same functionality and pinout; rated for –40°C to 125°C (vs. –55°C to 150°C for MP grade) | Suitable for commercial/industrial applications without extreme temperature requirements | Select LT3752MPFE#TRPBF when operation below –40°C or above 125°C is required; otherwise LT3752IFE#TRPBF offers cost advantage. |
| UCC2897AIPW | TI's active clamp forward controller; no integrated housekeeping DC/DC; requires external bias supply | Lacks integrated auxiliary regulator - increases component count and reduces efficiency in multi-rail systems | Choose LT3752MPFE#TRPBF when integrated housekeeping controller, AEC-Q100 qualification, or extended temperature range are mandatory. |
Compared with LT3752IFE#TRPBF and UCC2897AIPW, the LT3752MPFE#TRPBF uniquely combines extended temperature operation (–55°C to 150°C), AEC-Q100 qualification, and an integrated housekeeping DC/DC controller - eliminating external bias circuitry and enabling single-chip solutions for high-reliability isolated power.
Availability
LT3752MPFE#TRPBF is available at Aetrix Electronics and suitable for automotive battery isolation, 48V telecom power, and industrial HV power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3752MPFE#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 (now part of Analog Devices, Inc., following merger with Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT3752 product line is designed for high-efficiency isolated DC/DC conversion using active clamp forward topology - targeting automotive, telecom, and industrial applications demanding reliability, integration, and wide input voltage operation.
FAQ
What is the operating temperature range of the LT3752MPFE#TRPBF?
The LT3752MPFE#TRPBF is fully tested and guaranteed over –55°C to 150°C junction temperature. This extended range exceeds standard industrial grades and satisfies under-hood automotive requirements, including cold-crank (-40°C ambient with self-heating) and high-temperature engine bay operation. Data sheet Section "Order Information" and Absolute Maximum Ratings confirm this specification for the MP grade.
Does the LT3752MPFE#TRPBF support active clamp timing control?
Yes, the LT3752MPFE#TRPBF provides resistor-programmable timing delays: tAO (AOUT rise to OUT rise), tOA (OUT fall to AOUT rise), tSO (SOUT fall to OUT rise), and tOS (OUT fall to SOUT rise). These are configured using external resistors (RTAO, RTAS, RTOS) per datasheet Figures 11–14 and Electrical Characteristics tables. Precise control enables zero-voltage switching optimization in active clamp forward converters.
Is the LT3752MPFE#TRPBF AEC-Q100 qualified?
Yes, the LT3752MPFE#TRPBF is AEC-Q100 qualified for automotive applications. The datasheet "Features" section explicitly lists "AEC-Q100 Qualified for Automotive Applications", and the "Order Information" table confirms MP grade devices meet automotive reliability requirements. This qualification covers temperature cycling, HTOL, and ESD testing per AEC-Q100 Rev G.
What is the function of the UVLO_VSEC pin on the LT3752MPFE#TRPBF?
The UVLO_VSEC pin on the LT3752MPFE#TRPBF sets the volt-second clamp (DVSEC) threshold to limit maximum duty cycle and prevent transformer saturation. Applying a voltage (e.g., 2.5V) programs a 72.5% max duty cycle. It also enables open-loop DVSEC control without optocoupler or error amplifier - simplifying isolated feedback in certain designs per datasheet Section "DVSEC Open Loop Control".
How does the integrated housekeeping controller in the LT3752MPFE#TRPBF improve system design?
The integrated housekeeping controller in the LT3752MPFE#TRPBF generates a regulated auxiliary output (via HOUT) independently of the main forward converter, eliminating the need for an external bias supply. This reduces component count, improves efficiency (no separate converter losses), and enhances startup robustness - especially critical in systems where main output may not be present during initial power-up, such as automotive cold-crank scenarios.
LT3752MPFE#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):
- 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3752MPFE#TRPBF FAQ
1.How can I place an order for LT3752MPFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3752MPFE#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 LT3752MPFE#TRPBF reliable?
The price and inventory of LT3752MPFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3752MPFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3752MPFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3752MPFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3752MPFE#TRPBF?
LT3752MPFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3752MPFE#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 LT3752MPFE#TRPBF?
For technical support, including LT3752MPFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3752MPFE#TRPBF requirements.
6.How does Aetrix verify that LT3752MPFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3752MPFE#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 LT3752MPFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3752MPFE#TRPBF?
All LT3752MPFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3752MPFE#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 LT3752MPFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3752MPFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3752MPFE#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
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…
