LM5175RHFT

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

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<h2>LM5175RHFT Application Field and Working Principle</h2>LM5175RHFT is a high performance, wide input range monolithic step-down synchronous switch-mode DC/DC controllers that is designed to provide power regulation and monitoring functions to systems with a wide range of power demands. It provides high speed, on-chip frequency control, rapid transient response and low output ripple, making it ideal for high current applications like automotive, military, and industrial systems.<h4>Overview</h4>The LM5175RHFT DC/DC synchronous step-down controller offers an efficient, low-power solution for medium to large power system design. It is specifically designed with an optimized average on-time control architecture to achieve an optimal balance of efficiency, transient response and EMI performance. With an integrated high-side MOSFET and adjustable soft-start time, it provides a versatile and robust platform for various power conversion topologies such as isolated, non-isolated, step-down, boost, buck-boost and flyback.The LM5175RHFT offers a broad power range input voltage (6V to 80V) and includes a controller loop that can be used to track a 0.01% high-precision reference. For current monitoring, LM5175RHFT has an integrated high volt secondary side current sense circuit that can also accept an external voltage or current sense input. It also includes advanced features such as comprehensive thermal protection, adjustable overshoot and slow-start as well as selection options for phase shedding.<h4>Application Field</h4>The LM5175RHFT is ideal for a range of DC/DC applications, including automotive, industrial, computing and telecommunications systems, FPGAs and DSPs, high frequency and low power AC/DC power supplies, adapter solutions, battery charger solutions, and small form factor and military solutions.<h4>Working Principle</h4>The LM5175RHFT synchronous step-down controller is based on an average on-time control architecture that uses a continuous-time high-side and a low-side MOSFET combination to regulate the output voltage, independent of load power requirements. The synchronous architecture helps to reduce the device size, limit switching losses, and minimize ripple in the output voltage. The output voltage can be programmed in two different ways, either by an external resistor divider or an on-chip voltage reference. For optimal efficiency, the LM5175RHFT features a unique adaptive on-time control that dynamically adjusts the on-time based on the output voltage of the converter. It also includes an integrated high-side MOSFET and a variable soft-start to ensure reliable startup and smooth transitions across all load conditions.The LM5175RHFT also includes an adjustable voltage or current sense circuit that provides information on the current drawn from the secondary side of the converter. This feature is useful for optimizing the operation of the power supply for various load conditions. The IC also includes excellent output voltage accuracy, low noise operation, and superior temperature stability. To further improve the output voltage accuracy, an integrated Auto-calibration feature is also included. For comprehensive protection against conditions that could damage the device, the LM5175RHFT also includes a comprehensive thermal protection solution, as well as adjustable overshoot and slow-start.<h2>Conclusion</h2>The LM5175RHFT synchronous step-down controller provides an ideal solution for DC/DC applications requiring high efficiency and excellent load regulation. Its features and performance parameters make it an ideal choice for a wide range of applications, including automotive, industrial, computing, and telecommunications systems. Its innovative average on-time control architecture, adaptive on-time control, adjustable soft-start and integrated high-side MOSFET help to improve the efficiency and overall performance of the power system. It also provides complete protection against over temperature and over current conditions.

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