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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching ControllersLM5175RHFT
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LM5175RHFT - Texas Instruments

Manufacturer Part Number
LM5175RHFT
Manufacturer
Texas Instruments
Allelco Part Number
32D-LM5175RHFT
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
4,214 pcs available, New & Original
Parts Description
IC REG CTRLR BUCK-BOOST 28VQFN
Package
28-VQFN (5x4)
Data sheet
LM5175RHFT.pdf

PCN Design/Specification

Cylindrical Battery Holders.pdf

HTML Datasheet

LM5175 Datasheet.pdf

PCN Assembly/Origin

2.73KHz.pdf
RoHs Status
ROHS3 Compliant
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Specifications

LM5175RHFT Tech Specifications
Texas Instruments - LM5175RHFT technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - LM5175RHFT

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Supply (Vcc/Vdd) 3.5V ~ 42V
Topology Buck-Boost
Synchronous Rectifier Yes
Supplier Device Package 28-VQFN (5x4)
Series -
Serial Interfaces -
Package / Case 28-VFQFN Exposed Pad
Package Tape & Reel (TR)
Output Type Transistor Driver
Output Phases 1
Product Attribute Attribute Value
Output Configuration Positive
Operating Temperature -40°C ~ 125°C (TJ)
Number of Outputs 1
Mounting Type Surface Mount
Function Step-Up/Step-Down
Frequency - Switching 100kHz ~ 600kHz
Duty Cycle (Max) -
Control Features Enable, Frequency Control, Power Good, Soft Start
Clock Sync Yes
Base Product Number LM5175

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 2 (1 Year)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

LM5175RHFT Image
LM5175RHFT (1)

Manufacturer Part Number

LM5175RHFT

Manufacturer

Texas Instruments

Introduction

The LM5175RHFT is a versatile DC DC switching controller from Texas Instruments designed to manage power through step-up and step-down functionality, suitable for a broad range of voltage supply conditions.

Product Features and Performance

Operates from input voltages of 3.5V to 42V

Buck-Boost topology ensures efficient voltage conversion for step-up or step-down conditions

Supports output in the form of Transistor Driver

Frequency switching ranges from 100kHz to 600kHz

Embedded Synchronous Rectifier for enhanced efficiency

Clock synchronization available

Multiple control features including Enable, Frequency Control, Power Good, and Soft Start

Product Advantages

Flexible supply voltage range accommodates varied power needs

High conversion efficiency due to synchronous rectification

Adjustable frequency allows optimization for specific applications

Enhanced system reliability with built-in protective control features

Key Technical Parameters

Voltage Supply (Vcc/Vdd): 3.5V ~ 42V

Switching Frequency: 100kHz ~ 600kHz

Output Configuration: Positive

Topology: Buck-Boost

Temperature: Operating between -40°C ~ 125°C

Quality and Safety Features

Operating Temperature rated for industrial thermal extremes

Robust against voltage fluctuations within specified ranges

Built to meet stringent safety and quality standards of the electronics industry

Compatibility

Compatible with a wide range of input voltage levels for versatile applications

Suitable for various output load conditions due to adjustable performance specifications

Application Areas

Industrial systems

Power management solutions in automotive and telecommunication

Energy harvesting systems

Portable electronic devices requiring efficient power conservation profiles

Product Lifecycle

Currently active in production with no announced plans for discontinuation

Upgrades and replacements are available under Texas Instruments' extensive power management portfolio

Several Key Reasons to Choose This Product

High efficiency with synchronous rectification technology which minimizes energy loss

Versatile operating conditions compatible with a range of industrial applications

Reliable operation in extreme temperatures and volatile power environments

Ability to handle both step-up and step-down voltage requirements simplifies system design

Support from a reputable manufacturer, Texas Instruments, with a strong track record in power management solutions

Frequently Asked Questions(FAQ)

How does the LM5175RHFT handle input voltage variations in a buck-boost topology when designing a 48V industrial power supply with a 36V to 72V input range?
The LM5175RHFT maintains stable output regulation across its wide 3.5V to 42V Vcc range, but in your 36V–72V application, it operates as a buck-boost controller capable of both stepping up and stepping down. At 36V input, it can boost to meet higher output requirements, while at 72V, it steps down efficiently. Its synchronous rectifier architecture improves efficiency during transitions between modes, reducing conduction losses. However, at inputs above 42V, an external gate driver may be required due to internal supply limitations, which affects layout and thermal design.
What are the key differences between using the LM5175RHFT in continuous conduction mode (CCM) versus discontinuous conduction mode (DCM), especially for high-current applications like motor drives?
In CCM, the inductor current never falls to zero per switching cycle, which reduces output ripple and improves light-load efficiency. For the LM5175RHFT driving high-current loads, CCM is preferred to minimize RMS current stress on components. DCM offers simpler control but increases ripple and can reduce efficiency under heavy load. The device supports frequency shift and slope compensation to stabilize CCM operation across varying loads, making it suitable for dynamic industrial environments where load transients are frequent.
Can the LM5175RHFT operate reliably in automotive-grade temperature ranges, and how does its -40°C to 125°C junction rating compare to AEC-Q100 compliance?
While the LM5175RHFT is rated for -40°C to 125°C, this reflects its commercial or industrial grade performance. Automotive systems typically require full AEC-Q100 qualification, including reliability testing beyond standard environmental ratings. The device’s robust topology and internal protections make it suitable for harsh environments, but designers should verify long-term reliability through application-specific validation if used in automotive contexts without additional certification.
How does the LM5175RHFT support soft start functionality, and what impact does it have on inrush current during power-up in a 48V telecom power module?
The LM5175RHFT includes integrated soft start that gradually ramps the duty cycle upon enable, limiting inrush current into capacitive loads. This is critical in 48V telecom systems where large output capacitors can draw high surge currents. By controlling the ramp rate via an external capacitor, designers can balance startup time against peak current, protecting upstream components. This feature reduces mechanical relay wear and improves system-level reliability during repeated cycling.
What layout considerations are essential when implementing the LM5175RHFT in a high-power buck-boost converter to maintain stability and thermal performance?
Due to its 28-VQFN (5x4) package with an exposed pad, the LM5175RHFT requires careful PCB grounding and thermal management. Minimize loop inductance in the power stage by placing input/output capacitors close to the IC and using wide traces. Connect the exposed pad directly to a solid ground plane to enhance heat dissipation and improve electrical stability. Keep switching nodes short to reduce EMI, and consider a multi-layer board with inner power planes for high-current paths to ensure reliable operation at frequencies up to 600kHz.
How does the LM5175RHFT’s frequency control feature help in synchronizing multiple converters in a distributed power architecture?
The LM5175RHFT supports clock synchronization, allowing one master device to drive the switching frequency of slaves via a SYNC pin. This prevents beat frequencies and intermodulation distortion when multiple regulators operate near each other. In systems with several LM5175RHFT units, synchronizing them reduces EMI peaks and improves filter design predictability, especially important in sensitive RF or communication equipment where spectral noise must be tightly controlled.
Is it possible to use the LM5175RHFT in a bidirectional power application, such as battery charging and discharging, and what modifications would be needed?
The LM5175RHFT is unidirectional—optimized for positive output configurations—and not designed for true bidirectional energy flow. While it can regulate voltage in either direction depending on input/output polarity, reversing power flow requires external switches and control logic. For battery applications requiring charge/discharge modes, additional circuitry such as MOSFETs and feedback isolation would be needed, increasing complexity and cost beyond the scope of the IC’s intended use.
What is the significance of the Power Good signal in the LM5175RHFT, and how should it be utilized in system monitoring for a mission-critical DC-DC subsystem?
The Power Good pin provides a digital indication that the output voltage is within regulation tolerance, typically after soft start completes. In mission-critical systems, this signal can feed into a microcontroller to confirm healthy operation before enabling downstream logic or loads. It helps prevent damage from undervoltage conditions and enables graceful shutdown sequences. Proper debouncing or filtering may be necessary if used in noisy industrial environments to avoid false triggers.
How does the LM5175RHFT compare to the LM5160 in terms of integration level and suitability for compact space-constrained designs?
The LM5175RHFT is a full-featured buck-boost controller with integrated drivers and advanced protection features, whereas the LM5160 is a monolithic synchronous buck regulator with fewer pins and less programmability. For space-constrained designs requiring buck-boost capability, the LM5175RHFT offers greater flexibility despite a larger 28-pin QFN footprint. If the application only needs step-down conversion, the LM5160 could save board area, but the LM5175RHFT remains preferable when input voltage can exceed or fall below the output.
What external components are required to set the switching frequency for the LM5175RHFT, and how does frequency selection affect efficiency and component size?
The switching frequency is programmed using an external resistor tied to the RT/CLK pin. Lower frequencies (e.g., 100kHz) allow smaller inductors and capacitors but increase switching losses, reducing efficiency. Higher frequencies (up to 600kHz) shrink passive components and improve transient response but demand lower ESR capacitors and more careful layout to manage EMI. For the LM5175RHFT, selecting a moderate frequency like 300–400kHz often balances efficiency, size, and thermal performance in industrial applications.
How does the LM5175RHFT manage overcurrent protection, and what role does the inductor selection play in preventing saturation during fault conditions?
The LM5175RHFT uses cycle-by-cycle current limiting via sensing the high-side FET’s source node, providing fast response to overloads. Inductor saturation current must exceed the peak current limit threshold by a safety margin to prevent core collapse and secondary failures. During short-circuit events, the controller reduces duty cycle rapidly, but prolonged overloads still depend on thermal design. Choosing an inductor with sufficient saturation margin ensures the LM5175RHFT can sustain fault conditions without damaging surrounding components.
Can the LM5175RHFT be used in isolated power supplies, and if so, how would the transformer design differ from non-isolated implementations?
The LM5175RHFT is not inherently isolated and operates best in non-isolated topologies. To implement isolation, a coupled inductor or discrete transformer would be needed in the power path, complicating control and increasing leakage inductance. Feedback must then be derived from the secondary side using optocouplers or magnetic amplifiers. While possible, this significantly increases bill of materials and layout complexity compared to non-isolated designs, making the LM5175RHFT less ideal for galvanically isolated systems unless paired with additional isolation components.
What precautions should be taken when enabling the LM5175RHFT during cold starts in sub-zero environments to avoid latch-up or timing issues?
At temperatures below 0°C, bulk capacitance may exhibit higher ESR, delaying voltage ramp-up and affecting soft-start timing. Ensure input and output capacitors are rated for low-temperature operation and that the EN pin sequencing aligns with voltage stabilization. Some designs add a pre-charge circuit or delay the enable signal until main rails stabilize to prevent the LM5175RHFT from entering undefined states during cold startups, particularly in outdoor or automotive applications.
How does the LM5175RHFT’s enable pin interact with UVLO (under-voltage lockout), and what thresholds should be considered for robust system startup?
The enable pin allows external control of the IC’s operation independently of the internal UVLO. Internal UVLO typically trips around 3.2V, but the enable threshold is higher (~1.2V). Designers should ensure that power sequencing respects both signals: disable the IC if Vcc drops too low, even if enabled. For robust systems, pull the enable line low when Vcc is unstable to prevent partial operation during brownouts, leveraging the LM5175RHFT’s built-in safeguards.
What are the implications of operating the LM5175RHFT near its maximum junction temperature of 125°C in high ambient environments like industrial enclosures?
Prolonged operation near 125°C reduces semiconductor lifetime and increases failure risk. In high-ambient settings, thermal resistance from junction to ambient (typically >40°C/W without heatsinking) necessitates good airflow or copper pour under the QFN package. Derating the maximum switching frequency or duty cycle can lower internal power loss. Monitoring junction temperature through external sensors or modeling tools helps maintain reliability margins in the LM5175RHFT-based design.
How does the LM5175RHFT support frequency dithering or spread spectrum operation to reduce conducted emissions in EMC-sensitive applications?
While not explicitly mentioned in basic datasheet features, some TI controllers support internal dithering via modulation of the oscillator frequency. For the LM5175RHFT, spreading the switching spectrum over a narrow band can reduce peak emissions at harmonics. This requires firmware-controlled adjustments to the RT resistor or external PWM modulation. When implemented carefully, it lowers conducted EMI in compliance tests, aiding certification in medical or telecom devices where strict EMC limits apply.
Can multiple LM5175RHFT devices share the same feedback network in a multi-output system, and what risks does this introduce?
No, each LM5175RHFT requires dedicated feedback resistors for accurate voltage regulation. Sharing feedback networks causes crosstalk and instability, as one regulator’s output influences another. Even with slight mismatches, loading effects can shift individual outputs outside tolerance. For multi-rail systems, isolate feedback loops or use post-regulators to maintain precision. The LM5175RHFT’s single-output topology makes it unsuitable for shared-feedback architectures without significant redesign compromise.
What is the expected MTBF (mean time between failures) for the LM5175RHFT in continuous operation, and how do derating practices influence reliability projections?
Exact MTBF depends on operating conditions, but TI provides FIT (failures in time) data based on accelerated life testing. Operating the LM5175RHFT well below its maximum ratings—such as keeping junction temperature under 100°C and Vcc under 40V—significantly extends operational life. Derating voltage, current, and temperature improves reliability by reducing stress on internal oxides and bond wires. Combined with proper thermal management and layout, these practices enhance long-term stability in industrial and embedded systems.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments LM5175RHFT

Product Attribute LM5175RHFR LM5175QPWPRQ1 LM5175PWPR LM5175PWPT
Part Number LM5175RHFR LM5175QPWPRQ1 LM5175PWPR LM5175PWPT
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Number of Outputs - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Base Product Number - DAC34H84 MAX500 ADS62P42
Serial Interfaces - - - -
Duty Cycle (Max) - - - -
Series - - - -
Frequency - Switching - - - -
Clock Sync - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Type - Surface Mount Through Hole Surface Mount
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Supply (Vcc/Vdd) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Topology - - - -
Synchronous Rectifier - - - -
Function - - - -
Output Phases - - - -
Output Configuration - - - -
Control Features - - - -

LM5175RHFT Datasheet PDF

Download LM5175RHFT pdf datasheets and Texas Instruments documentation for LM5175RHFT - Texas Instruments.

PCN Design/Specification
Cylindrical Battery Holders.pdf
HTML Datasheet
LM5175 Datasheet.pdf
PCN Assembly/Origin
2.73KHz.pdf

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Customer Reviews

Evaluation: 10 Articles

  • 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.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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LM5175RHFT Image

LM5175RHFT

Texas Instruments
32D-LM5175RHFT

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