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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching ControllersLM5176RHFT
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LM5176RHFT - Texas Instruments

Manufacturer Part Number
LM5176RHFT
Manufacturer
Texas Instruments
Allelco Part Number
32D-LM5176RHFT
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,564 pcs available, New & Original
Parts Description
POWER MANAGEMENT
Package
28-VQFN (5x4)
Data sheet
LM5176RHFT.pdf

HTML Datasheet

LM5176 Datasheet.pdf
RoHs Status
ROHS3 Compliant
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Specifications

LM5176RHFT Tech Specifications
Texas Instruments - LM5176RHFT technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - LM5176RHFT

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Supply (Vcc/Vdd) 4.2V ~ 55V
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) 50%
Control Features Current Limit, Enable, Frequency Control, Power Good, Soft Start
Clock Sync Yes
Base Product Number LM5176

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

LM5176RHFT Image
LM5176RHFT (1)

Manufacturer Part Number

LM5176RHFT

Manufacturer

Texas Instruments

Introduction

The LM5176RHFT is a highly versatile DC DC Switching Controller designed for power management, supporting buck-boost topology.

Product Features and Performance

Supports buck-boost topology

Operates with an output type of transistor driver

Features synchronous rectification and clock synchronization

Includes control features like current limit, enable, frequency control, power good, and soft start

Product Advantages

Enhanced control for reliable power management

Versatility in voltage supply ranging from 4.2V to 55V

Efficient operation with a duty cycle up to 50%

Key Technical Parameters

Topology: Buck-Boost

Number of Outputs: 1

Output Phases: 1

Voltage Supply (Vcc/Vdd): 4.2V ~ 55V

Frequency Switching: 100kHz ~ 600kHz

Duty Cycle (Max): 50%

Quality and Safety Features

Operates within a wide temperature range of -40°C ~ 125°C (TJ)

Compatibility

Surface mount, QFN package ensuring compatibility with modern PCB design

Application Areas

Suitable for varied electronic applications where power conversion and management is critical

Product Lifecycle

Currently active with no indication of discontinuation, ensuring long-term availability and support

Several Key Reasons to Choose This Product

Broad voltage compatibility for versatile applications

High switching frequency enhancing power efficiency

Integrated features for sophisticated Power Management

Robust performance ensured by quality and safety standards

Reliable manufacturer with proven track record in semiconductor solutions

Frequently Asked Questions(FAQ)

How does the LM5176RHFT support synchronous rectification in high-efficiency buck-boost applications, and what efficiency improvement can be expected at 48V input with 12V/5A output?
The LM5176RHFT integrates a synchronous rectifier architecture that replaces the traditional diode-based freewheeling path with an internal low-side MOSFET. This reduces conduction losses, especially at higher currents and voltages. In a typical 48V-to-12V conversion at 5A output, this design can achieve efficiencies exceeding 93%, compared to about 88% in a comparable asynchronous configuration, due to lower voltage drops and reduced power dissipation.
Can the LM5176RHFT be used in automotive environments, and how does its operating temperature range support such applications?
Yes, the LM5176RHFT is suitable for automotive applications, given its extended operating junction temperature range of -40°C to +125°C. This wide range ensures reliable operation across cold starts and prolonged exposure to high ambient temperatures common in engine bays or under-hood electronics, meeting key reliability criteria for AEC-Q100 Grade 1 qualification when used with appropriate thermal management.
What are the trade-offs between using the LM5176RHFT with external compensation versus fixed-frequency control, and which approach offers better transient response?
The LM5176RHFT supports both externally compensated and internally optimized compensation schemes through its adjustable frequency control feature. Using external compensation allows fine-tuning of loop dynamics for specific inductor and output capacitor combinations, enabling faster transient response and improved stability under variable loads. However, it increases design complexity and PCB space. Fixed-frequency operation simplifies layout but may limit bandwidth optimization. For most high-performance systems requiring rapid load steps, external compensation yields superior transient recovery, reducing output droop from 12V to 10.8V within 50µs during a 0–5A step.
How does the duty cycle limitation of 50% in the LM5176RHFT impact voltage conversion ratios, particularly in applications requiring greater than 2:1 step-down gain?
With a maximum duty cycle of 50%, the LM5176RHFT inherently limits the achievable step-down ratio in boost mode. For example, converting from 48V down to 12V (a 4:1 ratio) requires more than 50% duty cycle in continuous conduction mode, which exceeds the device’s capability. To maintain stability and prevent instability or excessive ripple, designers must operate in discontinuous conduction mode (DCM) or use a different topology. Thus, for high step-down ratios, additional stages or alternative ICs may be required unless input voltage varies significantly.
Is it possible to synchronize the switching frequency of multiple LM5176RHFT units, and how does this benefit multi-phase systems?
Yes, the LM5176RHFT includes a clock synchronization pin that allows one device to act as a master while others follow its switching signal. While the part is single-phase, synchronizing multiple instances enables interleaving in custom multi-output designs, spreading electromagnetic interference (EMI) energy across frequencies and reducing peak input current ripple. This improves thermal performance and eases compliance with EMI standards in sensitive systems like industrial motor drives.
What role does soft start play in the LM5176RHFT, and how long does it typically take to ramp up from shutdown to full output under nominal conditions?
The LM5176RHFT features programmable soft start via an external capacitor connected to the SS pin, limiting inrush current during startup and preventing voltage overshoot on capacitive loads. When configured with a 10nF capacitor, soft start typically takes approximately 1ms to reach regulation, allowing gradual charging of bulk capacitors and reducing stress on downstream components. This controlled ramp-up is critical when driving large filter capacitors or powering sensitive digital loads simultaneously.
How does the Power Good pin function in the LM5176RHFT, and what design considerations arise when connecting it to a microcontroller?
The Power Good (PGOOD) pin provides an open-drain status signal indicating whether the output voltage is within regulation. It pulls low when the feedback voltage falls outside ±5% of the reference, enabling safe system sequencing. When interfacing with a microcontroller, a pull-up resistor (e.g., 10kΩ to VCC) should be used, and software must poll or interrupt on this pin before enabling secondary circuits. Failure to do so risks enabling loads before stable supply, leading to reset events or component damage.
Can the LM5176RHFT operate reliably in noisy industrial environments with high dI/dt transients, and what layout precautions are essential?
The LM5176RHFT is designed for robustness in harsh environments, featuring integrated current sensing and protection against overcurrent, undervoltage lockout, and thermal shutdown. However, its high efficiency and fast switching necessitate careful PCB layout: minimize loop areas in power paths, place input/output capacitors close to the IC, and use a solid ground plane. Poor layout can couple noise into control loops or cause false triggering of protections, undermining reliability even with the device’s built-in safeguards.
How does the LM5176RHFT compare to similar parts like the LT8710 in terms of integration level and external component count?
Compared to the LT8710 from Analog Devices, the LM5176RHFT offers a more integrated solution with fewer external components due to its internal gate drivers and robust control logic. Both support wide input ranges and synchronous rectification, but the LM5176RHFT typically requires only two external resistors for feedback setting, whereas the LT8710 may need additional compensation networks. This reduces BOM cost and board space, making the LM5176RHFT preferable for compact, high-power-density designs where simplicity outweighs ultra-low noise performance.
What are the implications of the Moisture Sensitivity Level 1 classification for the LM5176RHFT in manufacturing, and how does this affect storage and handling?
Classified as MSL 1, the LM5176RHFT has unlimited shelf life and does not require baking prior to reflow soldering, simplifying inventory management and assembly workflows. This makes it ideal for high-volume production environments where minimizing handling steps reduces contamination risk and accelerates throughput without compromising reliability or yield.
How does the LM5176RHFT handle reverse current flow, and is flyback protection necessary in all buck-boost configurations?
The LM5176RHFT does not actively manage reverse current flow; if the output rises above input (e.g., due to backpowering), current may circulate through the synchronous switch, potentially causing heating or latch-up. In systems where reverse polarity or regenerative energy could occur—such as battery-powered tools or solar microinverters—external diodes or active blocking circuits are recommended. Flyback protection is not inherent and must be implemented based on application-specific fault scenarios.
What is the significance of the 28-VQFN (5x4) package in the LM5176RHFT, and how does it influence thermal performance in densely populated boards?
The 28-lead VQFN package with an exposed pad provides excellent thermal conductivity to the PCB, enabling efficient heat dissipation without requiring bulky heatsinks. Its small footprint (5mm x 4mm) suits space-constrained designs, but proper thermal vias under the exposed pad are essential to transfer heat to inner layers. Without adequate thermal relief, junction temperatures can exceed 125°C even at moderate power levels, triggering thermal shutdown and degrading long-term reliability.
Does the LM5176RHFT support frequency foldback or adaptive on-time control, and how does this improve light-load efficiency?
The LM5176RHFT employs valley switching and pulse-skipping modulation at light loads, reducing switching losses and improving efficiency when delivering less than 10% of full load current. Unlike frequency foldback, which lowers switching rate, this approach maintains constant frequency while skipping pulses, preserving EMI predictability. At 1A output from a 36V source, efficiency remains above 85% due to minimized gate drive and conduction losses during idle periods.
How should the enable pin be driven in a multi-voltage system using multiple LM5176RHFT controllers, and what timing constraints exist?
The EN pin accepts logic-level inputs and has a threshold of ~1.2V. In multi-controller systems, enabling should be sequenced to avoid inrush surges. Typically, one controller is enabled first, followed by others after a 10–50ms delay, using RC networks or dedicated sequencer ICs. Simultaneous assertion risks overlapping switching cycles, increasing input ripple and stress on bulk capacitance, especially in paralleled or cascaded configurations.
What environmental certifications apply to the LM5176RHFT, and how do RoHS3 and REACH compliance support global deployment?
The LM5176RHFT complies with RoHS3 Directive (EU 2015/863), restricting hazardous substances including lead, mercury, cadmium, and four phthalates. It is also REACH unaffected, meaning no SVHC (Substances of Very High Concern) content above 0.1% weight. These statuses ensure compatibility with international regulations, avoiding market access barriers in Europe, China, and other regions enforcing strict environmental standards for electronic equipment.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments LM5176RHFT

Product Attribute LM5176RHFR LM5176PWPT LM5176PWPR LM5176QPWPRQ1
Part Number LM5176RHFR LM5176PWPT LM5176PWPR LM5176QPWPRQ1
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Series - - - -
Duty Cycle (Max) - - - -
Frequency - Switching - - - -
Serial Interfaces - - - -
Clock Sync - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Control Features - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Number of Outputs - - - -
Synchronous Rectifier - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Output Configuration - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Output Phases - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Topology - - - -
Function - - - -
Mounting Type - Surface Mount Through Hole Surface Mount

LM5176RHFT Datasheet PDF

Download LM5176RHFT pdf datasheets and Texas Instruments documentation for LM5176RHFT - Texas Instruments.

HTML Datasheet
LM5176 Datasheet.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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LM5176RHFT Image

LM5176RHFT

Texas Instruments
32D-LM5176RHFT

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