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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching ControllersLTC3728LXCUH#TRPBF
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LTC3728LXCUH#TRPBF - Analog Devices Inc.

Manufacturer Part Number
LTC3728LXCUH#TRPBF
Manufacturer
Analog Devices, Inc.
Allelco Part Number
32D-LTC3728LXCUH#TRPBF
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,570 pcs available, New & Original
Parts Description
IC REG CTRLR BUCK 32QFN
Package
32-QFN (5x5)
Data sheet
LTC3728LXCUH#TR.pdf

HTML Datasheet

LTC3728L/LX.pdf

Other Related Documents

Tape and Reel Packaging.pdf
RoHs Status
ROHS3 Compliant
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Specifications

LTC3728LXCUH#TRPBF Tech Specifications
Analog Devices Inc. - LTC3728LXCUH#TRPBF technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - LTC3728LXCUH#TRPBF

Product Attribute Attribute Value
Manufacturer Analog Devices, Inc.
Voltage - Supply (Vcc/Vdd) 4.5V ~ 28V
Topology Buck
Synchronous Rectifier Yes
Supplier Device Package 32-QFN (5x5)
Series -
Serial Interfaces -
Package / Case 32-WFQFN Exposed Pad
Package Tape & Reel (TR)
Output Type Transistor Driver
Output Phases 2
Product Attribute Attribute Value
Output Configuration Positive
Operating Temperature 0°C ~ 85°C (TA)
Number of Outputs 2
Mounting Type Surface Mount
Function Step-Down
Frequency - Switching 260kHz ~ 550kHz
Duty Cycle (Max) 99.4%
Control Features Enable, Power Good, Soft Start
Clock Sync No
Base Product Number LTC3728

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

LTC3728LXCUH#TRPBF Image
LTC3728LXCUH#TRPBF (1)

Manufacturer Part Number

LTC3728LXCUH#TRPBF

Manufacturer

Analog Devices

Introduction

The LTC3728LXCUH#TRPBF is a dual output, step-down DC DC switching controller designed for power management applications.

Product Features and Performance

Dual output design

Step-down functionality

Positive output configuration

Buck topology

Synchronous rectifier support for efficiency

Supports a wide input voltage range from 4.5V to 28V

Adjustable switching frequency from 260kHz to 550kHz

Maximum duty cycle of 99.4%

Soft start feature reduces inrush current

Power Good signal for output status monitoring

Enable control for convenient power management

Product Advantages

High efficiency due to synchronous rectification

Dual phase operation reduces output voltage ripple

Flexibility with adjustable switching frequency

Integrated features like soft start, Power Good signal, and Enable control simplify design

Key Technical Parameters

Number of Outputs: 2

Output Phases: 2

Voltage - Supply (Vcc/Vdd): 4.5V ~ 28V

Frequency - Switching: 260kHz ~ 550kHz

Duty Cycle (Max): 99.4%

Operating Temperature: 0°C ~ 85°C

Mounting Type: Surface Mount

Package / Case: 32-WFQFN Exposed Pad

Quality and Safety Features

Designed for robust performance in a temperature range of 0°C to 85°C

Protected against over-temperature conditions

Compatibility

Compatible with various surface mount technologies due to its 32-WFQFN exposed pad package

Application Areas

Suitable for telecommunications, computing systems, and industrial electronics

Product Lifecycle

Currently active with no indication of nearing discontinuation

Availability of replacements or upgrades not specified

Several Key Reasons to Choose This Product

Dual output functionality enables versatile power management solutions

High efficiency and low ripple via synchronous rectification and dual output phases

Wide input voltage range accommodates various supply levels

Integrated control features facilitate enhanced system management

Robust design suitable for a broad range of application temperatures

Frequently Asked Questions(FAQ)

What are the key differences between the LTC3728LXCUH#TRPBF and similar dual-phase buck controllers when selecting for a 24V input industrial application requiring high efficiency above 90%?
The LTC3728LXCUH#TRPBF supports a wide input range from 4.5V to 28V, making it suitable for 24V systems, while many comparable controllers like the LM5116 or LT8708 may have narrower or higher minimum input thresholds. With two integrated gate drivers and synchronous rectification support at 260kHz–550kHz switching frequency, the LTC3728LXCUH#TRPBF enables compact magnetics and high efficiency across light to full load conditions—critical for thermal management in industrial environments. Unlike some competitors that require external compensation per phase, this device uses a single-loop architecture, simplifying stability analysis and PCB layout.
How does the LTC3728LXCUH#TRPBF handle soft start and power good signals during cold startup from a low-voltage condition such as 5V?
The LTC3728LXCUH#TRPBF features an internal soft-start circuit that ramps up output voltage gradually over approximately 1ms under typical conditions, preventing inrush current spikes when starting from low supply levels like 5V. The Power Good pin asserts after both outputs reach within ±8% of their setpoints and deasserts if either rail fails, providing reliable sequencing feedback without requiring external comparators. This behavior ensures safe initialization of downstream loads, particularly important in systems with tightly coupled logic supplies.
Can the LTC3728LXCUH#TRPBF be used in a multiphase interleaved configuration to reduce input ripple below 10mVpp on a 12V/20A point-of-load converter?
While the LTC3728LXCUH#TRPBF is a dual-output controller capable of driving two phases independently, true multiphase interleaving requires precise phase alignment—which this IC does not support natively due to lack of clock synchronization. Without sync capability, paralleling phases increases EMI and complicates EMI filtering design. For applications demanding sub-10mVpp input ripple, alternative topologies like single-phase with larger bulk capacitance or using a dedicated multiphase controller with sync input would be more effective.
What trade-offs exist in choosing the LTC3728LXCUH#TRPBF versus discrete MOSFET driver solutions when designing a 1MHz buck stage?
The LTC3728LXCUH#TRPBF operates optimally in the 260kHz–550kHz range; attempting to run it near 1MHz risks exceeding its gate drive strength or violating thermal limits due to increased switching losses. Discrete driver approaches allow higher switching frequencies but add component count, increase layout complexity, and reduce overall system reliability. At 1MHz, the LTC3728LXCUH#TRPBF is suboptimal compared to purpose-built high-frequency controllers, though it remains viable for moderate-frequency designs where integration and ease of control outweigh peak efficiency demands.
How should PCB layout considerations differ when implementing the LTC3728LXCUH#TRPBF compared to single-phase buck regulators?
Due to its dual-phase architecture, the LTC3728LXCUH#TRPBF requires careful routing of high-current loops for each phase to avoid crosstalk and ensure even current sharing. Each phase must maintain symmetry in trace length and placement of input capacitors, inductors, and MOSFETs. Ground plane isolation between analog and power sections becomes critical, especially given the exposed pad package (32-QFN). Poor layout can degrade efficiency by 5–10% and destabilize regulation under dynamic loads.
Is the LTC3728LXCUH#TRPBF suitable for automotive applications meeting AEC-Q100 Grade 2 requirements?
No, the LTC3728LXCUH#TRPBF is specified only for operation from 0°C to 85°C ambient temperature, whereas AEC-Q100 Grade 2 mandates -40°C to +105°C operation. Although the device is RoHS3 compliant and manufactured in a lead-free process, its commercial-grade thermal envelope limits use in harsh automotive environments. Automotive designers should consider Analog Devices’ automotive-qualified variants such as those with extended temperature ranges and enhanced stress testing.
What impact does duty cycle variation have on output voltage accuracy when using the LTC3728LXCUH#TRPBF in a 24V-to-1.2V conversion?
With a maximum duty cycle of 99.4%, the LTC3728LXCUH#TRPBF can theoretically regulate down to near-zero voltages, but real-world limitations include minimum on-time constraints and inductor DCR drop. For a 24V-to-1.2V step-down ratio of ~20:1, most modern controllers achieve tight regulation, but the LTC3728LXCUH#TRPBF’s fixed 260kHz–550kHz range may force compromises in inductor selection to meet transient response targets. Output accuracy also depends on feedback divider stability and reference tolerance, typically ±1% typical.
How does the enable pin logic interact with soft start during brownout recovery scenarios?
The enable pin functions as a digital threshold detector; once asserted above the valid logic high level, it initiates the internal soft-start sequence rather than immediately enabling conduction. During brownout events, if the supply briefly dips below enable threshold but recovers quickly, the controller will restart cleanly via soft start instead of entering uncontrolled shoot-through states. This prevents repeated cycling and protects downstream components from voltage undershoots.
What precautions are necessary when replacing the LTC3728LXCUH#TRPBF in legacy designs originally using the non-LX version?
The LX suffix denotes a specific packaging variant—the LTC3728LXCUH#TRPBF comes in a 32-QFN (5x5) with exposed pad, which may require different thermal via patterns than earlier SOIC-packaged versions. Electrical performance remains consistent, but PCB footprint compatibility must be verified. Additionally, the LX package has lower inductance and improved thermal resistance, enabling better high-load efficiency, but assumes proper solder joint integrity under thermal cycling.
Why might someone choose the LTC3728LXCUH#TRPBF over a fully integrated DC-DC module despite higher bill-of-materials cost?
Integrated modules offer plug-and-play simplicity but often sacrifice flexibility in topology, efficiency optimization, and custom sequencing. The LTC3728LXCUH#TRPBF allows fine-grained control over switching frequency, compensation networks, and fault handling, which is valuable in space-constrained or dynamically reconfigurable systems. For prototyping or low-volume production, the controller approach reduces BOM count significantly while maintaining design adaptability.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. LTC3728LXCUH#TRPBF

Product Attribute LTC3728LXCUH#PBF LTC3728LZEUH#TRPBF LTC3728LIUH-1#TRPBF LTC3728LIUH-1#PBF
Part Number LTC3728LXCUH#PBF LTC3728LZEUH#TRPBF LTC3728LIUH-1#TRPBF LTC3728LIUH-1#PBF
Manufacturer Analog Devices Inc. Analog Devices Inc. Analog Devices Inc. Analog Devices Inc.
Number of Outputs - - - -
Frequency - Switching - - - -
Duty Cycle (Max) - - - -
Topology - - - -
Output Phases - - - -
Series - - - -
Clock Sync - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Mounting Type - Surface Mount Through Hole Surface Mount
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Control Features - - - -
Output Configuration - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Serial Interfaces - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Synchronous Rectifier - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Function - - - -

LTC3728LXCUH#TRPBF Datasheet PDF

Download LTC3728LXCUH#TRPBF pdf datasheets and Analog Devices Inc. documentation for LTC3728LXCUH#TRPBF - Analog Devices Inc..

HTML Datasheet
LTC3728L/LX.pdf
Other Related Documents
Tape and Reel Packaging.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

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LTC3728LXCUH#TRPBF Image

LTC3728LXCUH#TRPBF

Analog Devices Inc.
32D-LTC3728LXCUH#TRPBF

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