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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Analog Devices Inc. LT3752HFE-1#PBF

Name: LT3752HFE-1#PBF
Brand: Analog Devices Inc.
SKU: LT3752HFE-1#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LT3752HFE-1#PBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad

Datasheet:: LT3752HFE-1#PBF.pdf

Description:: IC REG CTRLR FWRD CONV 38TSSOP

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Product details

Overview

LT3752HFE-1#PBF from Analog Devices is a high-voltage active clamp synchronous forward controller IC optimized for isolated DC/DC power supplies with input voltages exceeding 100V. It integrates a housekeeping DC/DC controller, supports programmable volt-second clamp (DVSEC), delivers synchronous rectification control via SOUT, and operates up to 150°C junction temperature in a 38-lead TSSOP package.

For engineers reviewing the LT3752HFE-1#PBF datasheet, LT3752HFE-1#PBF pinout, LT3752HFE-1#PBF application, or LT3752HFE-1#PBF equivalent, this page provides verified technical context on HI-side active clamp topology support, INTVCC regulation at 10V, 100–500kHz programmable switching frequency, AEC-Q100 qualification, and precise timing delay programming (tAO, tOS, tSO) for transformer reset and synchronous FET drive coordination.

Technical Context

The LT3752HFE-1#PBF implements a current-mode PWM architecture specifically for HI-side active clamp forward converters, where the active clamp switch (driven by AOUT) is placed on the high-voltage primary side - distinct from the LO-side topology used by the LT3752 variant. Its dual-loop structure separates housekeeping (HFB/HCOMP) and main forward (FB/COMP) control paths, enabling independent soft-start, overcurrent protection, and output regulation.

It features adaptive leading edge blanking plus programmable extended blanking (TBLNK), cycle-by-cycle slope compensation, and programmable delays (tAO, tOA, tSO, tOS) to precisely coordinate OUT, AOUT, and SOUT gate drive edges - critical for minimizing voltage stress on primary MOSFETs and optimizing secondary-side synchronous rectifier conduction timing in high-efficiency isolated designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	10.5V to 16V (LT3752-1 variant); enables operation directly from HV car battery or telecom -48V systems without external pre-regulator.
INTVCC Regulation	10.0V typical; powers internal circuitry and gate drivers; dropout of 0.6V at 10mA ensures stable bias under load.
Switching Frequency	100kHz to 500kHz (programmable via RT resistor); allows optimization of magnetics size vs. efficiency trade-off.
DVSEC Clamp Range	17.5% to 76.2% max duty cycle (configurable via UVLO_VSEC voltage); supports >50% primary duty cycles for high transformer utilization.
Junction Temp Range	–40°C to +150°C (H-grade); qualified for under-hood automotive and industrial environments requiring extended thermal margin.
AOUT/SOUT Timing	tAO = 168–403ns, tOS = 52–164ns (RT-programmable); enables precise dead-time control between active clamp and main switch to prevent shoot-through.
AEC-Q100 Grade	Qualified per AEC-Q100 Rev G; meets automotive reliability requirements for mission-critical isolated power supplies.

Pinout & Package

The LT3752HFE-1#PBF is housed in a 38-lead plastic TSSOP package (FE-38) with missing pins (pins 23, 25, 27, 29, 31, 33, 35) to ensure high-voltage creepage and clearance 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 supply input	Accepts 10.5V–16V input; powers housekeeping regulator and internal logic; includes UVLO/OVLO detection.
INTVCC	Internal LDO output	10V regulated supply for gate drivers and analog circuitry; OVLO/UVLO thresholds protect against rail collapse.
OUT	Main primary-side switch driver	High-current N-channel gate driver (11.9V high level); controls main power MOSFET in forward topology.
AOUT	Active clamp switch driver	HI-side NMOS driver (11.9V high level); synchronized with OUT but phase-shifted to implement active clamp reset.
SOUT	Synchronous rectifier driver	Secondary-side synchronous FET driver; timing relative to OUT (tSO/tOS) minimizes body diode conduction loss.
HFB / HCOMP	Housekeeping controller feedback	HFB = 1.000V reference; HCOMP error amplifier output drives auxiliary DC/DC converter for improved system efficiency.
FB / COMP	Main forward loop feedback	FB = 1.250V reference; COMP error amplifier regulates isolated output via optocoupler or direct sensing.
UVLO_VSEC / OVLO	System-level protection inputs	Programmable undervoltage/overvoltage lockout with hysteresis; enables safe startup/shutdown sequencing.
RT	Oscillator timing	Resistor sets forward controller frequency (100–500kHz); also programs DVSEC foldback ratio.
SS1 / SS2	Soft-start/soft-stop control	SS1 controls frequency/DVSEC ramp-up; SS2 controls COMP pin soft-start; prevents inrush and overshoot.

Key Features

Feature	Design Value
HI-side active clamp topology	Enables efficient transformer reset in high-input-voltage applications (>100V), reducing primary switch voltage stress versus conventional forward topologies.
Integrated housekeeping DC/DC controller	Eliminates need for external bias supply; improves overall system efficiency and reduces BOM count in isolated converters.
Programmable volt-second clamp (DVSEC)	Allows primary duty cycle >50%, increasing transformer and rectifier utilization while maintaining safe flux balance.
Synchronous rectification timing control	Independent tSO/tOS delay programming ensures optimal turn-on/turn-off alignment of secondary FETs, minimizing conduction losses.
Hiccup-mode overcurrent protection	Provides self-recovering fault response during short-circuit events, enhancing system robustness without latch-up.

Applications

Automotive On-Board Charger Auxiliary Supply	48V Telecom Isolated Bias Rail
Use Scenario: Generating isolated 12V/1A bias for gate drivers and controllers in high-power EV on-board chargers operating from 400V–800V DC bus. IC Role / Device Role / Timing Role: LT3752HFE-1#PBF serves as the active clamp forward controller managing primary-side switching, HI-side clamp reset, and synchronous rectification timing. Use Value: Enables >94% efficiency at 48V_IN/10A_OUT while meeting AEC-Q100 requirements and supporting 150°C under-hood ambient.	Use Scenario: Providing isolated 5V/3A auxiliary power for control circuitry in -48V telecom rectifiers and distributed power architectures. IC Role / Device Role / Timing Role: LT3752HFE-1#PBF implements HI-side active clamp forward conversion with programmable DVSEC and precise tAO/tOS delays. Use Value: Achieves high power density and efficiency across wide input range (10.5–16V) without external pre-regulation, reducing system footprint.
Industrial PLC Isolated I/O Power	Military Vehicle DC/DC Converter
Use Scenario: Delivering reinforced-isolation 24V/2A power for digital I/O modules in programmable logic controllers exposed to harsh EMI and thermal environments. IC Role / Device Role / Timing Role: LT3752HFE-1#PBF manages transformer reset, synchronous rectification, and housekeeping supply generation in single-chip solution. Use Value: Supports –40°C to +150°C operation with integrated protection (hiccup OCP, UVLO/OVLO), eliminating discrete supervision ICs.	Use Scenario: Building MIL-STD-1275-compliant 270V_DC to 28V isolated converters for avionics and vehicle electronics with strict reliability mandates. IC Role / Device Role / Timing Role: LT3752HFE-1#PBF acts as the core forward controller with AEC-Q100 qualification, HI-side clamp, and programmable timing for ruggedized design. Use Value: Meets extended temperature and shock/vibe requirements while enabling compact, high-efficiency isolated power with minimal external components.

Automotive On-Board Charger Auxiliary Supply

48V Telecom Isolated Bias Rail

Use Scenario: Generating isolated 12V/1A bias for gate drivers and controllers in high-power EV on-board chargers operating from 400V–800V DC bus.

IC Role / Device Role / Timing Role: LT3752HFE-1#PBF serves as the active clamp forward controller managing primary-side switching, HI-side clamp reset, and synchronous rectification timing.

Use Value: Enables >94% efficiency at 48V_IN/10A_OUT while meeting AEC-Q100 requirements and supporting 150°C under-hood ambient.

Use Scenario: Providing isolated 5V/3A auxiliary power for control circuitry in -48V telecom rectifiers and distributed power architectures.

IC Role / Device Role / Timing Role: LT3752HFE-1#PBF implements HI-side active clamp forward conversion with programmable DVSEC and precise tAO/tOS delays.

Use Value: Achieves high power density and efficiency across wide input range (10.5–16V) without external pre-regulation, reducing system footprint.

Industrial PLC Isolated I/O Power

Military Vehicle DC/DC Converter

Use Scenario: Delivering reinforced-isolation 24V/2A power for digital I/O modules in programmable logic controllers exposed to harsh EMI and thermal environments.

IC Role / Device Role / Timing Role: LT3752HFE-1#PBF manages transformer reset, synchronous rectification, and housekeeping supply generation in single-chip solution.

Use Value: Supports –40°C to +150°C operation with integrated protection (hiccup OCP, UVLO/OVLO), eliminating discrete supervision ICs.

Use Scenario: Building MIL-STD-1275-compliant 270V_DC to 28V isolated converters for avionics and vehicle electronics with strict reliability mandates.

IC Role / Device Role / Timing Role: LT3752HFE-1#PBF acts as the core forward controller with AEC-Q100 qualification, HI-side clamp, and programmable timing for ruggedized design.

Use Value: Meets extended temperature and shock/vibe requirements while enabling compact, high-efficiency isolated power with minimal external components.

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#PBF	LO-side active clamp topology; 6.5–100V input range; INTVCC = 7V; same package/temp grade.	Used in lower-input-voltage forward converters (e.g., 24V/48V industrial); not suitable for >100V direct input.	Select LT3752HFE#PBF when primary input is ≤100V and LO-side clamp layout is preferred.
UCC2897AIPW	TI active clamp forward controller; 10–100V input; no integrated housekeeping controller; different pinout and timing architecture.	Requires external bias supply; lacks DVSEC programmability and AEC-Q100 qualification; suited for cost-sensitive non-automotive designs.	Choose UCC2897AIPW only if housekeeping integration is unnecessary and automotive qualification is not required.

Compared with LT3752HFE#PBF and UCC2897AIPW, the LT3752HFE-1#PBF uniquely combines HI-side clamp capability, integrated housekeeping regulation, AEC-Q100 qualification, and 10.5–16V input optimization - making it the only choice for high-reliability, high-input-voltage forward converters requiring minimal external components and extended temperature operation.

Availability

LT3752HFE-1#PBF is available at Aetrix Electronics and suitable for automotive on-board charger auxiliary supplies, 48V telecom isolated bias rails, and industrial PLC isolated I/O power requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LT3752HFE-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, 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 product line delivers highly integrated active clamp forward controllers targeting high-efficiency, isolated DC/DC power conversion in space-constrained, thermally demanding applications - especially where AEC-Q100 compliance and extended temperature operation are mandatory.

FAQ

What is the maximum input voltage supported by the LT3752HFE-1#PBF?

The LT3752HFE-1#PBF supports an operational input voltage range of 10.5V to 16V, as specified in its Electrical Characteristics table. This range is optimized for high-input-voltage applications such as telecom -48V systems and automotive HV battery-derived supplies. Unlike the LT3752 variant, the LT3752-1 family does not support direct 100V input - its VIN rating is limited to 16V, with higher system voltages handled externally via transformer turns ratio or pre-regulation.

How does the LT3752HFE-1#PBF differ from the standard LT3752HFE#PBF?

The LT3752HFE-1#PBF implements a HI-side active clamp topology, whereas the LT3752HFE#PBF uses a LO-side configuration. Key differences include: input voltage range (10.5–16V vs. 6.5–100V), INTVCC regulation (10.0V vs. 7.0V), and internal UVLO/OVLO thresholds. Both share the same 38-lead TSSOP package and –40°C to +150°C temperature grade, but their timing, biasing, and clamp switch placement are mutually incompatible without board redesign.

Does the LT3752HFE-1#PBF include an integrated housekeeping DC/DC controller?

Yes, the LT3752HFE-1#PBF integrates a dedicated housekeeping DC/DC controller with HFB (1.000V reference) and HCOMP pins. This controller generates a regulated auxiliary output to power downstream circuitry - eliminating the need for an external bias supply and improving overall system efficiency. The housekeeping loop operates independently from the main forward loop (FB/COMP), enabling separate soft-start, overcurrent protection, and voltage regulation.

What timing parameters can be programmed on the LT3752HFE-1#PBF for synchronous rectification?

The LT3752HFE-1#PBF supports full timing control for synchronous rectification via three programmable delays: tSO (SOUT fall to OUT rise), tOS (OUT fall to SOUT rise), and tAS (AOUT to SOUT). These are set using external resistors (RTAS, RTOS) and enable precise dead-time adjustment to minimize body-diode conduction loss in secondary-side FETs - critical for achieving >94% efficiency in high-current forward converters.

Is the LT3752HFE-1#PBF qualified for automotive applications?

Yes, the LT3752HFE-1#PBF is AEC-Q100 qualified (Grade H, –40°C to +150°C), meeting the reliability and stress-test requirements for automotive power electronics. This qualification covers temperature cycling, humidity testing, ESD, and other failure mechanisms relevant to under-hood and battery-system environments - making it suitable for use in EV on-board chargers, DC/DC converters, and auxiliary power modules.

LT3752HFE-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 ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 38-TSSOP-EP

LT3752HFE-1#PBF FAQ

1.How can I place an order for LT3752HFE-1#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LT3752HFE-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 LT3752HFE-1#PBF reliable?

The price and inventory of LT3752HFE-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 LT3752HFE-1#PBF is usually 5 days.

3.What payment methods are accepted for LT3752HFE-1#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3752HFE-1#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LT3752HFE-1#PBF?

LT3752HFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LT3752HFE-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 LT3752HFE-1#PBF?

For technical support, including LT3752HFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3752HFE-1#PBF requirements.

6.How does Aetrix verify that LT3752HFE-1#PBF is sourced from the original manufacturer or authorized distributors?

All LT3752HFE-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 LT3752HFE-1#PBF meets industry standards.

7.What is the process for return or replacement of LT3752HFE-1#PBF?

All LT3752HFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3752HFE-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 LT3752HFE-1#PBF part is unused and in its original packaging.

Return procedure for LT3752HFE-1#PBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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